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WFPC2 PSF Subtractions
Baggett, S.; Remy, M.; Surdej, Jean et al.
1998In Bulletin of the American Astronomical Society
 

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Abstract :
[en] Subtraction of scaled PSFs from direct CCD images of quasars (or stars) offers not only the possibility of detecting the presence of host or foreground galaxies (or companions like brown dwarfs or planets) but also provides a means of deriving accurate photometry of the primary objects. A series of PSF subtraction tests have been performed, using observed PSFs from the WFPC2 PSF Library as well as TinyTim PSFs; preliminary results indicate that appropriate synthetic TinyTim PSFs perform as well as observed PSFs. Specifically, using an optimally selected observed PSF, near the target on the chip ( < 10arcsec ), close in focus (within 1-2 microns), similar in spectral type, and with good S/N, yielded single photometric values with an RMS of ~ 0.01-0.02 mag. Using a carefully constructed synthetic PSF, close in focus and jitter to the target image, and as close as possible to the center of the target, resulted in photometric results with an RMS similar to that achieved with the observed PSF (0.01-0.02 mag).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Baggett, S.;  STSCI
Remy, M.
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Wiggs, M.;  STSCI
Language :
English
Title :
WFPC2 PSF Subtractions
Publication date :
01 December 1998
Event name :
American Astronomical Society, 191st AAS Meeting
Event place :
Washington, DC, United States
Event date :
January 1998
By request :
Yes
Audience :
International
Main work title :
Bulletin of the American Astronomical Society
Collection name :
Bulletin of the American Astronomical Society, Vol. 29
Pages :
1271
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since 13 December 2009

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