NDLI: The Herschel-PACS photometer calibration : Point-source flux calibration for scan maps

Content Provider	Springer Nature Link
Author	Balog, Zoltan Müller, Thomas Nielbock, Markus Altieri, Bru Klaas, Ulrich Blommaert, Joris Linz, Hendrik Lutz, Dieter Moór, Attila Billot, Nicolas Sauvage, Marc Okumura, Koryo
Copyright Year	2013
Abstract	This paper provides an overview of the PACS photometer flux calibration concept, in particular for the principal observation mode, the scan map. The absolute flux calibration is tied to the photospheric models of five fiducial stellar standards (α Boo, α Cet, α Tau, β And, γ Dra). The data processing steps to arrive at a consistent and homogeneous calibration are outlined. In the current state the relative photometric accuracy is ∼2 % in all bands. Starting from the present calibration status, the characterization and correction for instrumental effects affecting the relative calibration accuracy is described and an outlook for the final achievable calibration numbers is given. After including all the correction for the instrumental effects, the relative photometric calibration accuracy (repeatability) will be as good as 0.5 % in the blue and green band and 2 % in the red band. This excellent calibration starts to reveal possible inconsistencies between the models of the K-type and the M-type stellar calibrators. The absolute calibration accuracy is therefore mainly limited by the 5 % uncertainty of the celestial standard models in all three bands. The PACS bolometer response was extremely stable over the entire Herschel mission and a single, time-independent response calibration file is sufficient for the processing and calibration of the science observations. The dedicated measurements of the internal calibration sources were needed only to characterize secondary effects. No aging effects of the bolometer or the filters have been found. Also, we found no signs of filter leaks. The PACS photometric system is very well characterized with a constant energy spectrum νF ν = λF λ = const as a reference. Colour corrections for a wide range of sources SEDs are determined and tabulated.
Starting Page	129
Ending Page	160
Page Count	32
File Format	PDF
ISSN	09226435
Journal	Experimental Astronomy
Volume Number	37
Issue Number	2
e-ISSN	15729508
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-10-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Herschel space observatory PACS Far-infrared Instrumentation Calibration Scan-map Astronomy, Observations and Techniques Statistics for Engineering, Physics, Computer Science, Chemistry and Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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