Status of the SPIRE Photometer Data Processing Pipelines During the Early Phases of the Herschel Mission
C. Darren Dowell1, Michael Pohlen2,3, Chris Pearson3,4, MaA Griffin2, Tanya Lim3, George J. Bendo5, Dominique Benielli6, James J. Bock1, Pierre Chanial7,5, Dave L. Clements5, Luca Conversi8, Marc Ferlet3, Trevor Fulton9, Rene Gastaud7, Jason Glenn10, Tim Grundy3, Steve Guest3, Ken J. King3, Sarah J. Leeks3, Louis Levenson11, Nanyao Lu12, Huw Morris3, Hien Nguyen1, Brian O'Halloran5, Seb Oliver13, Pasquale Panuzzo7, Andreas Papageorgiou2, Edward Polehampton3,4, Dimitra Rigopoulou3, Helene Roussel14, Bernhard Schulz12, Arnold Schwartz12, Nicola Schneider7, David L. Shupe12, Bruce Sibthorpe15, Sunil Sidher3, Anthony J.
Smith13, Bruce M. Swinyard3, Markos Trichas5, Ivan Valtchanov8, Adam L. Woodcra^16, C. Kevin Xu12, & Lijun Zhang12
1Jet Propulsion Laboratory/California Insdtute of Technology, USA; 2Cardiff University, UK; 3Rutherford Appleton Laboratory, UK; 4University of Lethbridge, Canada; 5Imperial College London, UK; 6Laboratoire d'Astrophysique de Marseille, France; 7Commissariat à l’Énergie Atomique, France; 8ESA Herschel Science Centre, Spain; 9Blue Sky Spectroscopy Inc., Canada; 10University of Colorado, USA; 11California Insdtute of Technology, USA; 12NASA Herschel Science Centre, USA;
13University of Sussex, UK; 14Insdtut d'Astrophysique de Paris, France; 15UK Astronomy Technology Centre, UK; 16University of Edinburgh, UK
Level 2 Product
Photometer
Detector
Timeline
Nominal
Housekeeping
Timeline
BSM
Angles
Timeline
SPIRE
Instrument
Pointing
Product
Compute
BSM Angles
Photometer
Scan
Product
Photometer
Map
Product
Level 0.5 Product
Level 1 Product
Concatenate Timelines
First Level Deglitching
Electrical Filter Correction
Convert to Flux Density
Remove Bath Temperature Fluctuations
Bolometer Time Response
Remove Optical Crosstalk
Associate Sky Position
BSM
Positions
Table
Mapmaking
Unit Conversion
Correlation Parameters
Optical Crosstalk
Matrix
LPF Parameters
Separate Timelines
Baseline Removal
Remove Electrical Crosstalk Electrical Crosstalk
Matrix
Filter Function
Flag Thermistor Jumps
Detector offsets
Spacecraft Pointing
Instrument Aperture
Level 2 Product
Photometer
Detector
Timeline
BSM
Angles
Timeline
SPIRE
Instrument
Pointing
Product
Compute
BSM Angles
Averaged Pointed
Photometer
Product
Level 1 Product
Electrical
Crosstalk
Matrix Remove Electrical Crosstalk
First Level Deglitching
Convert to Flux Density
Demodulation
De-Nodding
Remove Optical Crosstalk
Average Nod Cycles
BSM
positions
Point Source Flux
and Position
Detector offsets
Spacecraft Pointing
Instrument Aperture
Associate Sky Position
Unit
conversion
Optical
Crosstalk
matrix
Second Level Deglitching
and Averaging
Pointed
Photometer
Timeline
Demodulated
Photometer
Product
Pointed
Photometer
Product
Extract Chop &
Jiggle Positions
Chop
Jiggle
Timeline
BSM
operations
Level 0.5 Product
BSM
Timeline
Jiggled
Photometer
Product
Detector
beam
profiles
Scan Map Pipeline Point Source Photometry Pipeline
For More Informadon Herschel Observers' Manual: hAp://herschel.esac.esa.int/Docs/Herschel/html/observatory.html SPIRE Observers' Manual: hAp://herschel.esac.esa.int/Docs/SPIRE/html/spire_om.html Herschel Interacdve Processing Environment: hAp://herschel.esac.esa.int/HIPE_download.shtml
Contact the authors: [email protected], [email protected], [email protected]
References Griffin, M., et al. “The Herschel‐SPIRE photometer data processing pipeline,” Proc. SPIE 7010 (Aug.
2008). Griffin, M. J., et al. “The Herschel‐SPIRE instrument and its in‐flight performance,” ArXiv e‐prints (May
2010). Schulz, B., et al. “Noise performance of the Herschel‐SPIRE bolometers during instrument ground
tests,” Proc. SPIE 7020 (Aug. 2008). Swinyard, B. M., et al. “In‐flight calibradon of the Herschel‐SPIRE instrument,” ArXiv e‐prints (May
2010).
Acknowledgments SPIRE has been developed by a consordum of insdtutes led by Cardiff Univ. (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL‐MSSL, UKATC, Univ. Sussex (UK); Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by nadonal funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK); and NASA (USA). HCSS, HSpot, and HIPE are a joint development by the Herschel Science Ground Segment Consordum, consisdng of ESA, the NASA Herschel Science Center, and the HIFI, PACS and SPIRE consorda. We thank the SPIRE SAG2 for the permission to show their map of NGC 6822 and our commissioning phase map of one of their objects (M83).
© 2010. All rights reserved.
No base line removal Standard base line removal Adapted base line removal
A: Source
in beam YP
B: Source
in beam YN
SBP = SoP
SBN = SoN + SS Flux
Density
Time
SoN
SoP
No
source
SAN = SoN
SAP = SoP + SS
Nod
position B
Source
Nod
position A
YPB
YNB
YNA
YPA
Offset for clarity
SBP = SoP + Sb3
SBN = SoN + Sb2 + SS
SAP = SoP + Sb2 + SS
SAN = SoN + Sb1
Chop
throw
Y
0.0026 0.0028 0.0030 0.0032 0.0034 0.0036V
-5.0×104
-4.5×104
-4.0×104
-3.5×104
-3.0×104
1/!V
0.0026 0.0028 0.0030 0.0032 0.0034 0.0036V
-5.0×104
-4.5×104
-4.0×104
-3.5×104
-3.0×104
1/!V
PSWE2
Coverage maps at 250, 350, and 500 µm for a cross‐linked scan.
Example calibradon of bolometer nonlinearity, believed to be accurate to beAer than 1%.
Middle: median subtracted per detector per endre scanline. Right: median subtracdon with source masked. We are also studying an iteradve destriper for baseline removal.
Example bolometer dmeline illustradng rapid chopping and slow “jiggling”.
Chopping and nodding sequence for point source photometry mode.
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