J/A+A/591/A117 Deep Herschel PACS point spread functions (Bocchio+, 2016)
Deep Herschel PACS point spread functions.
Bocchio M., Bianchi A., Abergel S.
<Astron. Astrophys. 591, A117 (2016)>
=2016A&A...591A.117B 2016A&A...591A.117B (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, infrared
Keywords: instrumentation: photometers - techniques: image processing -
techniques: photometric
Abstract:
The knowledge of the point spread function (PSF) of imaging
instruments represents a fundamental requirement for astronomical
observations. The Herschel PACS PSFs delivered by the instrument
control centre are obtained from observations of the Vesta asteroid,
providing a characterisation of the central part therefore excluding
fainter features. However, inumany cases information on both the core
and the wings of the PSFs is needed. With this aim, we combine Vesta
and Mars dedicated observations and obtain PACS PSFs with an
unprecedented dynamic range (∼106), at slow and fast scan speeds and
for the three photometric bands.
Description:
Herschel PACS dedicated PSF observations are scanmaps centred on
various objects taken at 70 (blue channel), 100 (green channel) and
160 (red channel) um. The core of the PSF is best characterised
observing faint objects (e.g. the asteroid Vesta), while the wings of
the PSF can only be seen in observations of bright objects (e.g.
Mars). Using a combination of images of bright and faint objects it is
therefore possible to have a good characterisation of the PACS PSFs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 110 12 List of fits images
fits/* . 12 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg [] Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 34 I5 Kibyte size Size of FITS file
36- 61 A26 --- FileName Name of FITS file, in subdirectory fits
63-110 A48 --- Title Title of the FITS file
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Acknowledgements:
Marco Bocchio, mbocchio(at)arcetri.astro.it
(End) Patricia Vannier [CDS] 02-Jun-2016