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Franco D. Albareti
Instituto de Física Teórica UAM/CSIC
28th September 2015
PhD student
under the supervision of
Prof. Francisco Prada and Prof. Antonio L. Maroto
Franco D. Albareti
28th September 2015
PhD student
under the supervision of
Prof. Francisco Prada and Prof. Antonio L. Maroto
Acknowledgements
Franco D. Albareti
28th September 2015
Work in collaboration with
Johan Comparat (IFT-UAM/CSIC), Carlos M. Gutiérrez (IAC),
Isabelle Pâris (Trieste Obs.), David Schlegel (LBNL),
Martín López-Corredoira (IAC), Donald P. Schneider (Penn. U),
…
Fine structure constant?
Introduction
Strength of coupling between
the electromagnetic field/vector bosons and matter.
Fundamental constant of Nature
Does it change with cosmic time?Franco D. Albareti
28th September 2015
TAE 2015 Benasque
How?
Introduction
[OIII] doublet
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
How?
Introduction
[OIII] doublet
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
How?
Introduction
[OIII] doublet
Forbidden lines Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Where?
Introduction
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Where?
Introduction
Cat’s Eye Planetary
NebulaFranco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Where?
Introduction
Two new lines discovered by
Huggins 1864
In 1927,
Bowen showed that
they are due to [OIII]
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Introduction
Where?
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Introduction
Where?
[OIII] on quasar spectra
Cosmological probesFranco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Introduction
Where?
We need lots of them!
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Current constraints based on the [OIII] doublet method
Introduction
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Current constraints based on the [OIII] doublet method
Introduction
2
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Current constraints based on the [OIII] doublet method
Introduction
2
Sloan Digital Sky Survey
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Same width
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Same width
Amplitude ratio ~ 3
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
Methodology
Redshift independent
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Measurement method
[OIII] doublet
Methodology
Redshift independent
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Sample selectionsdss.org
Sloan Digital Sky Survey
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
4 surveys
Sample selection
SDSS-III
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
4 surveys
APOGEE(Milky way structure:
composition)
MARVELS(Exoplanets)
SEGUE-II(Milky way structure:
kinematics)
Sample selection
SDSS-III
BOSS
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Explore our
neighborhood
APOGEE(Milky way structure:
composition)
BOSS
MARVELS(Exoplanets)
Sample selection
SDSS-III
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
SEGUE-II(Milky way structure:
kinematics)
Cosmological
(really far away)
APOGEE(Milky way structure:
composition)
BOSS
MARVELS(Exoplanets)
Sample selection
SDSS-III
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
SEGUE-II(Milky way structure:
kinematics)
BOSS
Sample selection
SDSS-III
Baryonic Oscillation
Spectroscopic Survey
BOSS spectrograph
Luminous Red Galaxies (LRGs)
&
Quasars
R ~ 2000
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
BOSS
Sample selection
SDSS-III
Baryonic Oscillation
Spectroscopic Survey
BOSS spectrograph
Luminous Red Galaxies (LRGs)
&
Quasars
R ~ 2000
SDSS-IV/eBOSS
(still further away)
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
BOSS
Sample selection
SDSS-III
Baryonic Oscillation
Spectroscopic Survey
BOSS spectrograph
Luminous Red Galaxies (LRGs)
&
Quasars
R ~ 2000
SDSS-IV/eBOSS
(still further away)~300,000
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Sample selection
Quasars from SDSS-III/BOSS
~300,000
Sample selection
Wavelength
Red
shif
tFranco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Quasars from SDSS-III/BOSS
~300,000
Sample selection
HαHβ
MgII
CIII]
CIV
Lyα
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Quasars from SDSS-III/BOSS
~300,000
Sample selection
[OIII] 4960 5008 A
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Quasars from SDSS-III/BOSS
~300,000
Sample selection
[OIII] 4960 5008 Az < 1
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Sample selection
Quasars up to z = 1; >10,000 (clean)
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Sample selection
Quasars up to z = 1; >10,000 (clean)
S/N [OIII] > 10
Converging
Gaussian fits
Outliers > 4σ
Aceptance rate ~ 1/4
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Sample selection
Quasars up to z = 1; >10,000 (clean)
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Sample selection
Quasars up to z = 1; >10,000 (clean)
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
ResultsSystematics?
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hβ contamination OK
Continuum subtraction OK
Different fitting methods OK
ResultsSystematics?
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Spatial variation
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Spatial variation
Results
OK
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Spatial variation
Dipole?
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Spatial variation
No statistical
significance
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Results[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results
This work (2015)
[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results
This work (2015)
[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
IC 418 (spirograph nebula)
Results[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
IC 418 (spirograph nebula)
Results[NeIII] lines
Small
[NeIII] line
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
Small
[NeIII] line
blended with Hε
and HeI
IC 418 (spirograph nebula)
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
Small
[NeIII] line
blended with Hε
and HeI
convolved spectrum
IC 418 (spirograph nebula)
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
Small
[NeIII] line
blended with Hε
and HeI
convolved spectrum
IC 418 (spirograph nebula)
OK
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
stacked SDSS spectra
[NeIII] lines
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results[NeIII] lines
stacked SDSS spectra
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
[NeIII] lines
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
The precision is limited by the sky subtraction
ResultsSimulations
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
The precision is limited by the sky subtraction
ResultsSimulations
Typical
errors
from the
Gaussian
fitting
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
The precision is limited by the sky subtraction
ResultsSimulations
Errors
Typical
errors
from the
Gaussian
fitting
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
ResultsRedshift bins
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Results
Linear redshift dependence
Franco D. Albareti
28th September 2015
TAE 2015 Benasuqe
Combining with quasars from DR7
SDSS spectrograph
Reanalizing the spectra
Results
[OIII] 4960 5008 A[OIII] 4960 5008 A
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Results
[OIII] 4960 5008 A[OIII] 4960 5008 AReobserved quasars
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Robust constraint for the variation of the fine structure
constant at z ~ 0.6 (5.7 Gyr ago) (more than 35 samples
analyzed).
For further details, “FDA, J. Comparat, F. Prada et al.,
MNRAS 452 (2015) 4153,
arXiv:1501.00560”
Results
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Outline
Introduction
Methodology
Sample selection
Results
APOGEE-QFranco D. Albareti
28th September 2015
TAE 2015 Benasque
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Collaborators: F.D. Albareti, J. Comparat, F. Prada, I. Pâris, A. Font, D. Schlegel,
J. Hennawi, J-P. Kneib, D.P. Schneider, A. Myers, W. Brandt, J.K Parejko, your name here…
40 targets, 12 visits 450 fiber hours
Pilot program 2015/16
Black hole mass
Redshifts
[OIII] APOGEE
MgII, CIV BOSS
???
Fine-structure constant
Thanks!
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Backslides
Franco D. Albareti
28th September 2015
TAE 2015 Benasque
Exact formula for the determination of the
variation of the fine structure constant
Franco D. Albareti
17th April 2015
12th MultiDark
Fine structure constant?
Introduction
Energy levels
Relativity + Spin
Franco D. Albareti
17th April 2015
12th MultiDark
How do we measure its variation?
Geological constraints
Local measurements
Astronomical tests
Introduction
Absorption z = 0.6-4
Emission z = 0.05-1.0
Oklo phenomenon z=0.15
Meteorites z=0.45
10 years
Franco D. Albareti
17th April 2015
12th MultiDark
How do we measure its variation?
Absorption lines from quasars
(Many-multiplet method )
More precise
Several assumptions
Controversial
Introduction
Franco D. Albareti
17th April 2015
12th MultiDark
How do we measure its variation?
Emission lines doublet from quasars
Less precise
Straight-forward
No assumptions
Fine structure of the emission lines
Introduction
Franco D. Albareti
17th April 2015
12th MultiDark
Forbidden lines
Electric quadrupole
and magnetic dipole
transitions
Found in extremely
rarefied media
Introduction
Franco D. Albareti
17th April 2015
12th MultiDark
Continuum fit: seven-order polynomial
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Continuum fit: seven-order polynomial
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Continuum fit: seven-order polynomial
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Find the lines SDSS Redshift
Three significant figures (error estimates )
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Find the lines SDSS Redshift
Three significant figures (error estimates )
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Measurement method
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Measurement method
Methodology
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
Real pixels (with errors)
Gaussian fits
Expected line position
Error for ~ 10^-3,-4
[OIII] lines
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
Real pixels (with errors)
Gaussian fits
Expected line position
Error for ~ 10^-3,-4
[OIII] lines
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
Real pixels (with errors)
Gaussian fits
Expected line position
Error for ~ 10^-3,-4
[OIII] lines
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
[OIII] lines [NeIII] lines
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
[OIII] lines [NeIII] lines
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
[OIII] lines [NeIII] lines
Franco D. Albareti
17th April 2015
12th MultiDark
Line positions
Methodology
[OIII] lines [NeIII] lines
6th Balmer line
Franco D. Albareti
17th April 2015
12th MultiDark
Criteria
Redshift
Sample selection
~300,000
~45,000
Franco D. Albareti
17th April 2015
12th MultiDark
Criteria
Redshift
Noise
Sample selection
~300,000
~45,000
~13,000
Franco D. Albareti
17th April 2015
12th MultiDark
Criteria
Redshift
Noise
Sample selection
~300,000
~45,000
~13,000
Low redshift
Franco D. Albareti
17th April 2015
12th MultiDark
Criteria
Redshift
Noise
Sample selection
~300,000
~45,000
~13,000
Low redshift
Franco D. Albareti
17th April 2015
12th MultiDark
Criteria
Redshift
Noise
Sample selection
~300,000
~45,000
~13,000
Low redshift
High redshift
Franco D. Albareti
17th April 2015
12th MultiDark
Criteria
Redshift
Noise
Sample selection
~300,000
~45,000
~13,000
High redshift
Low redshift
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
~300,000
~45,000
~13,000
~12,000
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
Outlier points
~300,000
~45,000
~13,000
~12,000
~11,000
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
Outlier points
~300,000
~45,000
~13,000
~12,000
~11,000
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
Outlier points
~300,000
~45,000
~13,000
~12,000
~11,000
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
Outlier points
~300,000
~45,000
~13,000
~12,000
~11,000
4%
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
Outlier points
~300,000
~45,000
~13,000
~12,000
~11,000
Mild constraints
4%
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Criteria
Redshift
Noise
Non-converging Gaussian fits
Outlier points
~300,000
~45,000
~13,000
~12,000
~11,000
Mild constraints
4%
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines?
Results
Same width
Amplitude ratio ~ 3
Systematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Results
Same width
Amplitude ratio ~ 3
Systematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fit?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits? mmm…
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits? mmm…
Hβ contamination?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits? mmm…
Hβ contamination OK
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits? mmm…
Hβ contamination OK
Continuum subtraction?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits? mmm…
Hβ contamination OK
Continuum subtraction OK
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits? mmm…
Hβ contamination OK
Continuum subtraction OK
Different fitting methods?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods?
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Different fitting methods
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits mmm…
Hβ contamination OK
Continuum subtraction OK
Different fitting methods OK
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hβ contamination OK
Continuum subtraction OK
Different fitting methods OK
ResultsSystematics?
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
Same width
Amplitude ratio ~ 3
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines
Systematics
OK
OK
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
More affected by noise and Hbeta
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
More affected by noise and Hbeta
OK
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits
Systematics
More affected by noise and Hbeta
OK
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination
Systematics
OK
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction
Systematics
OK
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction OK
Different methods
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction OK
Different methods
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction OK
Different methods
Systematics
OK
Franco D. Albareti
17th April 2015
12th MultiDark
Misidentification of the lines OK
Interval for the Gaussian fits OK
Hbeta contamination OK
Continuum subtraction OK
Different methods OK
And more…(simulations)
Systematics
“F. D. Albareti et al., arXiv: 1501.00560”
Franco D. Albareti
17th April 2015
12th MultiDark
Final results
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Final results
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Final results
A factor 2.5 of improvement is expected…?
Systematics
Franco D. Albareti
17th April 2015
12th MultiDark
Robust constraint for the variation of the fine structure
constant at z ~ 0.6 (5.7 Gyr ago) (more than 35 samples
analyzed).
For further details,
Well…, it is not a big improvement…
“FDA, J. Comparat, F. Prada et al.,
arXiv:1501.00560”
Results
mmm…
why?
Franco D. Albareti
17th April 2015
12th MultiDark
Errors
Results
Franco D. Albareti
17th April 2015
12th MultiDark
Errors
Standard deviation
Results
Franco D. Albareti
17th April 2015
12th MultiDark
Errors
Standard deviation
Sky
Results
Franco D. Albareti
17th April 2015
12th MultiDark
Errors
Standard deviation
Sky
Results
Franco D. Albareti
17th April 2015
12th MultiDark
Atmospheric O2 airglow emission
Results
Franco D. Albareti
17th April 2015
12th MultiDark
The precision is limited by the sky subtraction
Results
Franco D. Albareti
17th April 2015
12th MultiDark
VLT/UVES High-resolution spectrograph
Future projects
R ~ 62,000 – 110,000
z ~ 0.6
Franco D. Albareti
17th April 2015
12th MultiDark
< 10^-6
VLT/UVES High-resolution spectrograph
Future projects
R ~ 62,000 – 110,000
z ~ 0.6
Franco D. Albareti
17th April 2015
12th MultiDark
Future projects
R ~ 62,000 – 110,000
z ~ 0.6
Proposal submitted…
Franco D. Albareti
17th April 2015
12th MultiDark
VLT/UVES High-resolution spectrograph
VLT/UVES High-resolution spectrograph
NOT/FIES High-resolution spectrogpraph
Future projects
R ~ 62,000 – 110,000
z ~ 0.6
< 10^-6
Franco D. Albareti
17th April 2015
12th MultiDark
R ~ 62,000 – 110,000
z ~ 0.3
R ~ 62,000 – 110,000
z ~ 0.6
R ~ 62,000 – 110,000
z ~ 0.3
VLT/UVES High-resolution spectrograph
NOT/FIES High-resolution spectrogpraph
Future projects
Franco D. Albareti
17th April 2015
12th MultiDark
Proposal
submitted….
APOGEE-N Med-resolution spectrograph
Future projects
Franco D. Albareti
17th April 2015
12th MultiDark
R ~ 22,000
z ~ 2.2< 10^-5
APOGEE-Q
Ancillary Science
Proposal
For SDSS-IV/APOGEE-2
APOGEE-N Med-resolution spectrograph
Future projects
Franco D. Albareti
17th April 2015
12th MultiDark
R ~ 22,000
z ~ 2.2< 10^-5
APOGEE-Q
Ancillary Science
Proposal
For SDSS-IV/APOGEE-2
APOGEE-N Med-resolution spectrograph
Future projects
Franco D. Albareti
17th April 2015
12th MultiDark
R ~ 22,000
z ~ 2.2< 10^-5
APOGEE-Q
Ancillary Science
Proposal
For SDSS-IV/APOGEE-2
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
Sample selection
Franco D. Albareti
17th April 2015
12th MultiDark
