Gaia DR2 The first 'real' Gaia catalogue€¦ · Gaia DR2 | The rst "real" Gaia...

Gaia DR2— The first ”real” Gaia catalogue —

Michael Biermannon behalf of the Gaia Data Processing and Analysis Consortium DPAC

June 18, 2018

Michael Biermann Gaia DR2 June 18, 2018 1 / 50

The second Gaia Data Release (Gaia DR2) contains:

Gaia DR2 Gaia DR1 Hipparcostotal 1690 1140 0,12positions, parallaxes, proper motions 1330 2 0,12positions only 360 1140 —G magnitudes 1690 1140 0,12colours (GBP, GRP) 1380 — 0,12radial velocitites 7,2 — —stellar parameters 77 – 161 — — ︸

︷︷︸

millions

quasars 560.000 135.000 3variable stars 550.000 3.200 12.000asteroids 14.000 — 48

22 months of data; reference epoch = 2015.5

Magnitude distribution of Gaia DR2 sources

Magnitude distribution of Gaia DR2 sources: 5p- and 2p-solutions

Gaia DR2 precisions: parallaxes

typical precisions:

G magnitude precisions15 mag 0.03 mas17 mag 0.1 mas20 mag 0.7 mas21 mag 2.0 mas

Systematics below 0.1 mas.

Gaia DR2 precisions: parallaxes

Gaia DR2 precisions: proper motions

Gaia DR2 precisions: photometry

calibration floors:

G 2 mmagBP 5 mmagRP 3 mmag

orange DR2magenta DR1

G band 330 – 1050 nmBP 330 – 680 nmRB 630 – 1050 nm

Gaia DR2 precisions: radial velocities

RVS: 845 – 872 nm; only stars in the temperature range [3550,6900] KMichael Biermann Gaia DR2 June 18, 2018 16 / 50

Source IDs and cross-match: duplicates removed

Cycle-01 sources

−→ improved accuracy

Cycle-02 sources

Significantly improved angular resolution

— dense sky areas —

0 1 2 3 4 5 6Separation [arcsec]

3e4Pai

DR2 w: GBP & GRP

DR1Constant ¯eld density

Gaia DR1: 2 arcsecondsGaia DR2: 0.4 arcseconds

}factor 5 !

Significantly improved angular resolution

— sparse sky areas —

0 1 2 3 4 5 6 7 8 9 10Separation [arcsec]

DR2 w: GBP & GRP

DR1Constant ¯eld density

Gaia “sees” real double stars with 0.4 – 3 arcseconds separation

Room for improvements

1◦ checkered parallax pattern(0.03 mas, in the LMC, but present over all the sky)

6065707580859095100

¡0:10

¡0:08

¡0:06

¡0:04

¡0:02

Right Ascension [deg]

... 20◦ spatial patterns of typically 0.02 mas

... and a -0.03 mas parallax zero point errorMichael Biermann Gaia DR2 June 18, 2018 20 / 50

Gaia DR2 is an independent catalogue!

stand alone this time

different photometric system (∆G ≈ −0.1 mag, colour dependent)

different source listI merged / split / new sourcesI Gaia DR2 ↔ Gaia DR1

F G < 16: 80-90% of the sources changed sourceIDF G < 18: 20% of the sources changed sourceIDF tracking table is delivered as part of Gaia DR2

I DR3 outlook:F roughly 10% changes to be expected overall

Gaia-Archive

• ARI: http://gaia.ari.uni-heidelberg.de/

• ESA: http://archives.esac.esa.int/gaia

Gaia Documentation & Videos

we highly recommend to read the Gaia DR2 A&A release papers(≈ 10 papers)

you should also consult the Gaia DR2 on-line documentationhttp://gaia.esac.esa.int/documentation

there are in addition science verification papers with valuableinformation(A&A, ≈ 10 papers)

we have videos for scientistsexplaining important aspects of Gaia DR2https://www.cosmos.esa.int/web/gaia/guide-to-scientists

Gaia User Forumhttps://www.cosmos.esa.int/web/gaia/forum

A glimpse of science with Gaia DR2...

LMC rotational field

Hertzsprung-Russell diagram

white dwarfs with H envelope

white dwarfs with He envelope

white dwarfs with C-O core that lost their envelope

binaries with two white dwarfs of equal mass

binaries with a white dwarf and a main-sequence star

unknown population of white dwarfs?

yet unknown population of white dwarfs?

giant branch

HRD of 32 open cluster

HRD of 14 globular cluster

Praesepe and Hyades cluster HRD

“Clean” HR diagram of nearby (< 100 pc) stars

¡1 0 1 2 3 4 5 6

GBP¡ GRP [mag]

g 10($=1

$ > 10 mas, $/σ$ > 10, phot xp mean flux over error > 10:338,833

¡1 0 1 2 3 4 5 6

GBP¡ GRP [mag]

g 10($=1

Sources additionally filtered by (magnitude-dependent) chi-square: 249,793

¡1 0 1 2 3 4 5 6

GBP¡ GRP [mag]

g 10($=10

Sources additionally filtered by chi-square and flux excess ratio: 242,583

Stars within 50 pc from the Sun

73,246

Stars within 50 pc from the Sun) stars

Sources additionally filtered by (magnitude-dependent) chi-square: 39,478

Stars within 50 pc from the Sun

Sources additionally filtered by chi-square and flux excess ratio: 34,001(but at least 700 real stars lost)

On the road to Gaia DR3 ...

Forthcoming Gaia DR3 — planned for end 2020

photometric epoch data for variable stars

double stars

100,000 solar system objects with orbits

asteroid spectra

more than 1 million quasars and extended objects

35 million radial velocities

astrometry, photometry, spectroscopy, variable stars, ...:increased numbers, better accuracies/systematics

variable stars: more types of variability

Gaia DR2 The first 'real' Gaia catalogue€¦ · Gaia DR2 | The rst "real" Gaia...

Documents

Servopack DR2 Yaskawa

Cataloging Accreted Stars within Gaia DR2 using Deep Learningvalidated on an independent Fire catalog in Sec. 7.3. Section 8 describes the application to Gaia data, producing the catalog

Biermann feedback

MODELLING LONG-PERIOD VARIABLES IN THE GAIA ERA · information. In comparison, the Gaia DR2 catalog of LPV candidates (Mowlavi et al. 2018) provides a single period per star, limited

Biermann - Cosmic acceleration

Gaia Data Release 2: ﬁrst stellar parameters from Apsis · The second Gaia data release (Gaia DR2) contains, beyond the astrometry, three-band photometry for 1.38 billion sources

Interactive out-of-core rendering and filtering of one ...liu.diva-portal.org/smash/get/diva2:1247648/FULLTEXT01.pdfas the second data release (DR2) of their Gaia mission, in the open

The GALAH survey and Gaia DR2: dissecting the stellarMNRAS 000, 000{000 (2018) Preprint 21 January 2019 Compiled using MNRAS LATEX style le v3.0 The GALAH survey and Gaia DR2: dissecting

Gaia - arxiv.org · MNRAS 000,1{15(2020) Preprint 8 September 2020 Compiled using MNRAS LATEX style le v3.0 Age dissection of the vertical breathing motions in Gaia DR2: evidence

Data Release 2: The ﬁrst Gaia catalogue of long-period ...Gaia Data Release 2 (DR2) provides a unique all-sky catalogue of 550737 variable stars, of which 151761 are long-period

Gaia DR2 The first 'real' Gaia cataloguegaia.ari.uni-heidelberg.de/gaia-workshop-2018/... · calibration oors: G 2 mmag BP 5 mmag RP 3 mmag orangeDR2 magentaDR1 G band 330 { 1050

Using the Six Astrometric Parameters from Gaia DR2 I ... · DR2 release complete with epoch J2000 positions, the primary processing of the data it presents is to the mean epoch of

Gaia aus der Sicht eines [-1.5ex]'First Look Scientists'€¦ · Michael Biermann Gaia aus FLS Sicht MPIA AstroTechTalk,16.09.16 5 / 40. First Look is the in-depth assessment of scienti

Gaia GraL: Gaia DR2 Gravitational Lens Systems. III. A systematic … · 2019. 9. 20. · Digital Sky Survey (SDSS,Alam et al.2015), the Dark Energy Survey ... (Baña-dos et al.2018),

A Gaia DR2 view of proper motions and internal properties ...39 Milky Way dwarf galaxies and galaxy candidates with prior spectroscopic information -> to ease selection of probable

DBSCAN聚类算法在Gaia-DR2 · DBSCAN聚类算法在Gaia-DR2中检测疏散星团的研究徐守坤王超y 庄丽华高新华 (常州大学信息科学与工程学院常州213164)

Gaia Data Release 2: Using Gaia parallaxes · The Gaia Data Release 2 (Gaia DR2 ) Gaia Collaboration et al. (2018b) provides precise positions, proper motions, and paral-laxes for

DR2 Written Report.docx

F. Jiménez-Esteban et al. - European Space Agency...2019/07/03 · Gaia-DR2 and the VO fran.jimenez-esteban@cab.inta-csic.es White dwarfs Structure: •Electron degenerated core

Gaia DR2 Distances and Peculiar Velocities for Galactic ... › pdf › 1804.11349.pdf · G mag, where available. No conversion between epochs is carried out here using the DR2 proper