J/ApJS/215/9 PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)
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 2014ApJS..215....9W (SIMBAD/NED BibCode)
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 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 0.5deg2 of the M31
star-forming disk.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 2710 Observations
table5.sam 125 1000 The photometry catalog (among 116,861,756 stars)
table6.dat 107 299998 The Artificial Star Catalog
table7.dat 40 711 RMS, Bias, and DOLPHOT-reported uncertainties from
our artificial star tests as a function of stellar
density, filter, and magnitude
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
II/208 : BVRI CCD photometry in the field of M 31 (Magnier+ 1992)
VI/39 : Model Atmospheres (Kurucz, 1979)
J/AJ/146/135 : Physical parameters of 29 M31 globular clusters (Agar+, 2013)
J/AJ/146/20 : Structural param. for 79 GCs in M31 (Wang+, 2013)
J/ApJ/765/71 : VI light curves of RRL stars in M31 (Contreras Ramos+, 2013)
J/ApJ/752/95 : PHAT stellar cluster survey. I. Year 1 (Johnson+, 2012)
J/ApJ/745/156 : M31 Cepheids with HST/WFC3 (Riess+, 2012)
J/A+A/544/A155 : HST photometry of M31 globular clusters (Federici+, 2012)
J/AJ/144/142 : HST phot. of young stellar populations in M31 (Bianchi+, 2012)
J/PASP/122/745 : HST WFPC2 star clusters in M31. III. (Hodge+, 2010)
J/ApJ/708/817 : RR Lyrae variables in M32 and M31 (Fiorentino+, 2010)
J/ApJS/184/152 : Deep optical photometry in M31 (Brown+, 2009)
J/A+A/507/1375 : HST/ACS VI data of M31 globular clusters (Perina+, 2009)
J/AJ/138/1667 : HST survey of young clusters in M31. III. (Barmby+, 2009)
J/AJ/138/770 : HST/WFPC survey of M31 bright young clusters (Hodge+, 2009)
J/PASP/120/1 : HST WFPC2 star clusters in M31. II. (Krienke+, 2008)
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
J/AJ/129/2663 : B photometry of M31 variable star candidates (Williams+, 2005)
J/ApJ/559/851 : Young star cluster candidates in M31 (Williams+, 2001)
J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001)
J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)
J/ApJ/504/113 : F175W and F275W photometry of M31 and M32 (Brown+, 1998)
J/AJ/114/1488 : Globulars in M31 (Holland+ 1997)
http://archive.stsci.edu/missions/hlsp/phat/ : PHAT photometry archive
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Target name
18- 19 I2 h RAh [0] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [42/47] Minute of Right Ascension (J2000)
24- 29 F6.3 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- [+] Sign of the Declination (J2000)
32- 33 I2 deg DEd [41/42] Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 42 F5.2 arcsec DEs Arcsecond of Declination (J2000)
44- 53 A10 "YYYY/MM/DD" Obs.date UT date of the observation start time
55- 62 A8 "h:m:s" Obs.time UT start time of the observation
64- 71 F8.3 s Exp [10/1900]?=0 Exposure time
73- 76 A4 --- Inst Instrument used (ACS or FWC3)
78- 88 A11 --- Aper Aperture used in Inst ("WFC" or "WFCENTER"
for ACS, "IR-FIX" or UVIS-CENTER" for WFC3)
90-102 A13 --- Filter Filter used in Inst
104-110 F7.3 deg PA-V3 [0/360] Position angle
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Byte-by-byte Description of file: table5.sam
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Bytes Format Units Label Explanations
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1- 13 F13.10 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
15- 28 F14.10 deg DEdeg Declination in decimal degrees (J2000) (1)
30- 35 F6.3 mag F275W ? HST/WFC3 F275W band VEGA magnitude
37- 42 F6.1 --- s_F275W [-99/] Signal-to-Noise in HST/WFC3 F275W band
44 A1 --- q_F275W [TF] F275W band good star reliability GST flag (2)
46- 51 F6.3 mag F336W ? HST/WFC3 F336W band VEGA magnitude
53- 57 F5.1 --- s_F336W [-99/] Signal-to-Noise in HST/WFC3 F336W band
59 A1 --- q_F336W [TF] F336W band good star reliability GST flag (2)
61- 66 F6.3 mag F475W ? HST/ACS F475W band VEGA magnitude
68- 73 F6.1 --- s_F475W [-99/] Signal-to-Noise in HST/ACS F475W band
75 A1 --- q_F475W [TF] F475W band good star reliability GST flag (2)
77- 82 F6.3 mag F814W ? HST/ACS F814W band VEGA magnitude
84- 89 F6.1 --- s_F814W [-99/] Signal-to-Noise in HST/ACS F814W band
91 A1 --- q_F814W [TF] F814W band good star reliability GST flag (2)
93- 98 F6.3 mag F110W ? HST/WFC3 F110W band VEGA magnitude
100-106 F7.1 --- s_F110W [-99/] Signal-to-Noise in HST/WFC3 F110W band
108 A1 --- q_F110W [TF] F110W band good star reliability GST flag (2)
110-115 F6.3 mag F160W ? HST/WFC3 F160W band VEGA magnitude
117-123 F7.1 --- s_F160W [-99/] Signal-to-Noise in HST/WFC3 F160W band
125 A1 --- q_F160W [TF] F160W band good star reliability GST flag (2)
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Note (1): The object name is M31PHATV2 JRAdeg+DEdeg.
Note (2): "T" (true) indicates a reliable photometry.
The "ST" catalog contains sources with S/N≥4 and reasonable sharpness
in at least one of the six bands. The GST "F" flag marks the unreliable
measurements (low S/N, or strongly affected by blending, cosmic rays,
or instrument artifacts)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 11 F11.8 deg RAdeg Right Ascension in decimal degrees (J2000)
13- 23 F11.8 deg DEdeg Declination in decimal degrees (J2000)
25- 30 F6.3 mag F275W-in [14.1/36.9] Input HST/WFC3 F275W band magnitude
32- 37 F6.3 mag F275W-out [14.1/25.4]?=99.999 Output HST/WFC3 F275W band
magnitude
39- 44 F6.3 mag F336W-in [14.4/34.8] Input HST/WFC3 F336W band magnitude
46- 51 F6.3 mag F336W-out ?=99.999 Output HST/WFC3 F336W band magnitude
53- 58 F6.3 mag F475W-in Input HST/ACS F475W band magnitude
60- 65 F6.3 mag F475W-out ?=99.999 Output HST/ACS F475W band magnitude
67- 72 F6.3 mag F814W-in Input HST/ACS F814W band magnitude
74- 79 F6.3 mag F814W-out ?=99.999 Output HST/ACS F814W band magnitude
81- 86 F6.3 mag F110W-in ?=99.999 Input HST/WFC3 F110W band magnitude
88- 93 F6.3 mag F110W-out ?=99.999 Output HST/WFC3 F110W band magnitude
95-100 F6.3 mag F160W-in [13.5/27.3]?=99.999 Input HST/WFC3 F160W band
magnitude
102-107 F6.3 mag F160W-out [13.5/25.7]?=99.999 Output HST/WFC3 F160W band
magnitude
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 4 F4.2 arcsec-2 Density [0.04/7.6] Stellar density (1)
6- 10 A5 --- Filter Filter (F110W, F160W, F275W, F336W, F475W or
F814W)
12- 15 F4.1 mag mag [14/27] Magnitude in Filter
17- 22 F6.3 mag Bias [-1/0.2] Median magnitude bias (2)
24- 28 F5.3 mag RMS [0.004/1.2] RMS uncertainty from artificial
star tests
30- 34 F5.3 mag DOLPHOT [0.001/0.2] DOLPHOT reported uncertainty
36- 40 F5.1 --- Ratio [1/133] Ratio of RMS to DOLPHOT uncertainties
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Note (1): Density of stars with 18.5<F160W<19.5 per arcsec-2.
Note (2): From artificial star test (output-input).
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History:
From electronic version of the journal
References:
Dalcanton et al. PHAT Suvey. 2012ApJS..200...18D 2012ApJS..200...18D
Rosenfield et al. Paper I. 2012ApJ...755..131R 2012ApJ...755..131R
Williams et al. Paper II. 2012ApJ...759...46W 2012ApJ...759...46W
Beerman et al. Paper III. 2012ApJ...760..104B 2012ApJ...760..104B
Weisz et al. Paper IV. 2013ApJ...762..123W 2013ApJ...762..123W Cat. J/ApJ/762/123
Fouesneau et al. Paper V. 2014ApJ...786..117F 2014ApJ...786..117F
Simones et al. Paper VI. 2014ApJ...788...12S 2014ApJ...788...12S
Dong et al. Paper VII. 2014ApJ...785..136D 2014ApJ...785..136D
Dalcanton et al. Paper VIII. 2015ApJ...814....3D 2015ApJ...814....3D
Veyette et al. Paper IX. 2014ApJ...792..121V 2014ApJ...792..121V
Williams et al. Paper X. 2014ApJS..215....9W 2014ApJS..215....9W This catalog
Lewis et al. Paper XI. 2015ApJ...805..183L 2015ApJ...805..183L
Gregersen et al. Paper XII. 2015AJ....150..189G 2015AJ....150..189G
Wagner-Kaiser et al. Paper XIII. 2015MNRAS.451..724W 2015MNRAS.451..724W Cat. J/MNRAS/451/724
Senchyna et al. Paper XIV. 2015ApJ...813...31S 2015ApJ...813...31S
Gordon et al. Paper XV. 2016ApJ...826..104G 2016ApJ...826..104G
Johnson et al. Paper XVI. 2016ApJ...827...33J 2016ApJ...827...33J Cat. J/ApJ/827/33
Lewis et al. Paper XVII. 2017ApJ...834...70L 2017ApJ...834...70L
Johnson et al. Paper XVIII. 2017ApJ...839...78J 2017ApJ...839...78J
Williams et al. Paper XIX 2017ApJ...846..145W 2017ApJ...846..145W Cat. J/ApJ/846/145
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Jan-2015