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J/ApJS/215/9 PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)
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Beginning of ReadMe :J/ApJS/215/9 PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)
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The Panchromatic Hubble Andromeda Treasury.
X. Ultraviolet to infrared photometry of 117 million equidistant stars.
Williams B.F., Lang D., Dalcanton J.J., Dolphin A.E., Weisz D.R.,
Bell E.F., Bianchi L., Byler N., Gilbert K.M., Girardi L., Gordon K.,
Gregersen D., Johnson L.C., Kalirai J., Lauer T.R., Monachesi A.,
Rosenfield P., Seth A., Skillman E.
<Astrophys. J. Suppl. Ser., 215, 9 (2014)>
=2014ApJS..215....9W (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, nearby ; Photometry, HST ; Surveys ; Ultraviolet ;
Infrared sources
Keywords: Local Group; galaxies: stellar content; surveys
Abstract:
We have measured stellar photometry with the Hubble Space Telescope
Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys in near
ultraviolet (F275W, F336W), optical (F475W, F814W), and near infrared
(F110W, F160W) bands for 117 million resolved stars in M31. As part of
the Panchromatic Hubble Andromeda Treasury survey, we measured
photometry with simultaneous point-spread function (PSF) fitting
across all bands and at all source positions after precise astrometric
image alignment (<5-10mas accuracy). In the outer disk, the photometry
reaches a completeness-limited depth of F475W 28, while in the
crowded, high surface brightness bulge, the photometry reaches
F475W 25. We find that simultaneous photometry and optimized
measurement parameters significantly increase the detection limit of
the lowest-resolution filters (WFC3/IR) providing color-magnitude
diagrams (CMDs) that are up to 2.5mag deeper when compared with CMDs
from WFC3/IR photometry alone. We present extensive analysis of the
data quality including comparisons of luminosity functions and repeat
measurements, and we use artificial star tests to quantify photometric
completeness, uncertainties and biases. We find that the largest
sources of systematic error in the photometry are due to spatial
variations in the PSF models and charge transfer efficiency
corrections.
Description:
The data for the Panchromatic Hubble Andromeda Treasury (PHAT) survey
were obtained from 2010 July 12 to 2013 October 12 using the Advanced
Camera for Surveys (ACS) Wide Field Channel (WFC), the Wide Field
Camera 3 (WFC3) IR (infrared) channel, and the WFC3 UVIS
(ultraviolet-optical) channel. The observing strategy is described in
detail in Dalcanton et al. (2012ApJS..200...18D). A list of the target
names, observing dates, coordinates, orientations, instruments,
exposure times, and filters is given in Table 1.
Using the ACS and WFC3 cameras aboard HST, we have photometered 414
contiguous WFC3/IR footprints covering 0.5deg^2^ of the M31
star-forming disk.