J/ApJS/247/47 Ultraviolet survey of M31 with UVIT on AstroSat (Leahy+, 2020)
AstroSat UVIT survey of M31: point-source catalog.
Leahy D.A., Postma J., Chen Y., Buick M.
<Astrophys. J. Suppl. Ser., 247, 47 (2020)>
=2020ApJS..247...47L 2020ApJS..247...47L
ADC_Keywords: Galaxies, nearby; Photometry, ultraviolet
Keywords: Ultraviolet astronomy ; Ultraviolet sources ; Andromeda Galaxy
Abstract:
An ultraviolet survey of M31 has been carried out during 2017-19 with
the UltraViolet Imaging Telescope (UVIT) instrument on board the
AstroSat Observatory. Here we analyze far- and near-ultraviolet (FUV
and NUV) observations from the M31 UVIT survey, which covers a sky
area of ∼3°x1° with spatial resolution of ∼1". The
observations included six filter bands in the wavelength range of
120-280nm. The limiting magnitude (AB) in the FUV band (CaF2 filter),
which has the largest number of detected sources, is ∼23. The primary
product of this work is the M31 UVIT point-source catalog containing
positions and photometry. In total ∼75000 sources were detected at FUV
or NUV wavelengths.
Description:
The images used in this study were acquired during 2017-19 with the
UltraViolet Imaging Telescope (UVIT) instrument on board the AstroSat
mission.
UVIT is composed of two 38cm telescopes, one for FUV (130-180nm)
wavelengths and one for NUV (200-300nm) and visible (VIS) (320-550nm)
wavelengths. The field of view for both telescopes is circular with
diameter ∼28'.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 19 M31 AstroSat/UVIT observations
table5.dat 59 74907 The AstroSat UVIT M31 point source catalog
table6.dat 122 47421 The AstroSat UVIT M31 filter-matched catalog
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See also:
J/A+A/459/321 : BV photometry of M31 eclipsing binaries (Vilardell+, 2006)
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
J/AJ/133/2393 : UBVRI phot. in 7 dwarfs galaxies, M31 and M33 (Massey+, 2007)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJ/703/614 : UV star-forming regions in M31 (Kang+, 2009)
J/AJ/144/142 : HST photometry of young stellar pop. in M31 (Bianchi+, 2012)
J/ApJS/199/37 : GALEX catalog of star clusters in M31 (Kang+, 2012)
J/ApJS/215/9 : PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)
J/AJ/152/62 : Revised LGGS UBVRI phot. of M31 and M33 stars (Massey+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Field [1/19] Field number
4- 12 F9.6 deg RAdeg ? Right ascension (J2000) (1)
14- 21 F8.5 deg DEdeg ? Declination (J2000) (1)
23- 32 A10 --- Filt ? Filters (2)
34- 57 A24 s Exp ? Exposure times for each filter
59- 65 I7 d BJD0 [2457672/2458448]? Solar system Barycentric
Julian Date of the start of the observation
(Common integer part to each filter)
67-100 A34 d OffTime ? Fractional part of the observation start
for each filter
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Note (1): J2000 coordinates of the nominal pointing center of the observation.
Note (2): Filter labels as follows:
a = FUV CaF2 (∼125-175nm)
b = FUV BaF2
c = FUV Sapphire (∼145-175nm)
d = FUV Silica (∼165-175nm)
e = NUV B15 (∼210-235nm)
f = NUV N2 (∼275-285nm)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Filter Filter identifier
13- 19 F7.4 deg RAdeg [9.19/12.3] Right Ascension (J2000)
21- 27 F7.4 deg DEdeg [40/42.6] Declination (J2000)
29- 34 F6.3 mag ABmag [12.8/27.2] Apparent AB magnitude in Filter
36- 41 F6.3 mag mag [11.3/25.5] Apparent Vega magnitude in Filter
43- 48 F6.3 mag Errmag [0.02/11.1] Magnitude uncertainty
50- 59 A10 --- Field Field number(s)
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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 A11 --- Filt1 First filter in the pair
12 A1 --- --- [/]
13- 23 A11 --- Filt2 Second filter in the pair
25- 31 F7.4 deg RAdeg [9.19/12.3] First filter Right Ascension (J2000)
33- 39 F7.4 deg DEdeg [40/42.6] First filter Declination (J2000)
41- 46 F6.3 mag ABmag1 [12.8/25] Apparent AB magnitude in first filter
48- 53 F6.3 mag mag1 [11.3/22.6] Apparent Vega magnitude in
first filter
55- 59 F5.3 mag Errmag1 [0.02/1.7] Magnitude uncertainty in first filter
61- 70 A10 --- Field1 Field number(s) of first filter
72- 78 F7.4 deg RA2deg [9.19/12.3] Second filter Right Ascension (J2000)
80- 86 F7.4 deg DE2deg [40/42.6] Second filter Declination (J2000)
88- 93 F6.3 mag ABmag2 [12.8/24.2] Apparent AB magnitude in 2nd filter
95-100 F6.3 mag mag2 [11.3/25.6] Apparent Vega magnitude
in second filter
102-106 F5.3 mag Errmag2 [0.02/1.1] Magnitude uncertainty in second filter
108-117 A10 --- Field2 Field number(s) of second filter
119-122 F4.2 arcsec Sep [0/1.8] Separation between Filter coordinates
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Jun-2020