Physics
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acs..rept...12s&link_type=abstract
Instrument Science Report ACS 2007-12, 15 pages
Physics
Hubble Space Telescope, Hst, Advanced Camera For Surveys, Acs, Psf-Width, Psf, Temperatures, Galactic Bulge Field
Scientific paper
We have used the HST ACS/WFC observations of a Galactic bulge field taken over a continuous interval of 7 days (Prop 9750) to investigate the possible dependence of the ACS focus with the external temperatures. This dataset allows us to investigate possible focus variations over timescales of a few hours to a few days. The engineering data related to the external temperatures for this duration show that the maximum temperature change occurred over the first 1.5 days. Among all the different temperatures recorded, the truss diametric differential and the truss axial temperatures are the only two temperatures which have the same timescale of variation as the PSFwidth variations. The PSF-widths also strongly correlate with these two temperatures during this time interval. We empirically fit the PSF-width variations with these 2 temperature sensor values. This suggests that the focus has a similar dependence, and we recommend that this finding be followed up with the determination of actual focus values to check if the focus values indeed have the same correlation. If so, the temperature data can be useful in estimating the focus values, which can then be used to predict the PSFs to a first order.
Lallo Matt
Makidon Russ
Sahu Kailash C.
No associations
LandOfFree
ACS PSF Variations with Temperatures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ACS PSF Variations with Temperatures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ACS PSF Variations with Temperatures will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1008946