J/ApJ/687/230 Survey of M31 with Spitzer (Mould+, 2008)
A point-source survey of M31 with the Spitzer Space Telescope.
Mould J., Barmby P., Gordon K., Willner S.P., Ashby M.L.N., Gehrz R.D.,
Humphreys R., Woodward C.E.
<Astrophys. J., 687, 230-241 (2008)>
=2008ApJ...687..230M 2008ApJ...687..230M
ADC_Keywords: Photometry, infrared ; Stars, supergiant ; Stars, giant ; YSOs ;
Galaxies, IR
Keywords: galaxies: individual (M31) - galaxies: stellar content
Abstract:
We explore the stellar population of M31 in a Spitzer Space Telescope
survey utilizing IRAC and MIPS observations. Red supergiants are the
brightest objects seen in the infrared; they are a prominent
evolutionary phase. Due to their circumstellar envelopes, many of
these radiate the bulk of their luminosity at IRAC wavelengths and do
not stand out in the near-infrared or optically. Going fainter, we see
large numbers of luminous asymptotic giant branch stars (AGB), many of
which are known long-period variables. Relative to M33 the AGB carbon
star population of M31 appears sparse, but this needs to be
spectroscopically confirmed.
Description:
The IRAC data and reduction are described in Barmby et al.
(2006ApJ...650L..45B 2006ApJ...650L..45B); observations of M31 were taken as part of
Spitzer General Observer program 3126 in 2005 January and August.
The MIPS resolution ranges from 6" at 24um to 40" at 160um. Gordon et
al. (2006ApJ...638L..87G 2006ApJ...638L..87G) described the MIPS program surveying M31
(images were taken on 2004 August 25).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 426 Photometry of the infrared brightest stars
table2.dat 64 106 2MASS 6X matches
table3.dat 47 831 Long period variables (LPV) matches
table4.dat 67 599 MIPS 24 micron sources
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See also:
J/AJ/132/271 : SFR of M31 from resolved stars in near-IR (Olsen+, 2006)
J/ApJS/154/623 : M31 Long Period Variables : Photometry (Mould+, 2004)
J/ApJS/118/177 : JHK photometry of M31 spiral arm (Kodaira+, 1998)
J/AJ/96/1884 : BVRJHK photometry of M31 red supergiants (Humphreys+ 1988)
http://irsa.ipac.caltech.edu/applications/Gator : NASA/IPAC catalogs online
(including 2MASS 6X)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- IRAC Identification (JHHMMSS.ss+DDMMSS.s)
21- 28 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 37 F8.5 deg DEdeg Declination in decimal degrees (J2000)
39- 43 F5.2 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
45- 48 F4.2 mag e_3.6mag Error in 3.6mag
50- 54 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5 micron band magnitude
56- 59 F4.2 mag e_4.5mag ? Error in 4.5mag
61- 65 F5.2 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude
67- 70 F4.2 mag e_5.8mag ? Error in 5.8mag
72- 76 F5.2 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude
78- 81 F4.2 mag e_8.0mag Error in 8.0mag
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- 2MASS 2MASS 6X identification number
6- 13 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
15- 22 F8.5 deg DEdeg Declination in decimal degrees (J2000)
24- 28 F5.2 mag Jmag 2MASS J band magnitude
30- 34 F5.2 mag Hmag 2MASS H band magnitude
36- 40 F5.2 mag Ksmag 2MASS Ks band magnitude
42- 46 F5.2 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
48- 52 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5 micron band magnitude
54- 58 F5.2 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude
60- 64 F5.2 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [MSH2004] Mould, Saha, & Hughes 2004,
Cat. J/ApJS/154/623 identification number
7- 11 F5.2 mag Jmag ? The J Johnson band magnitude
13- 17 F5.2 mag Hmag ? The H Johnson band magnitude
19- 23 F5.2 mag Kmag ? The K Johnson band magnitude
25- 29 F5.2 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
31- 35 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5 micron band magnitude
37- 41 F5.2 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude
43- 47 F5.2 mag 8.0mag ? Spitzer/IRAC 8.0 micron band magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SST The SSTM1M311 identification
(JHHMMSS.ss+DDMMSS.s)
21- 28 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 37 F8.5 deg DEdeg Declination in decimal degrees (J2000)
39- 43 F5.2 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
45- 49 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5 micron band magnitude
51- 55 F5.2 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude
57- 61 F5.2 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude
63- 67 F5.2 mag 24mag Spitzer/MIPS 24 micron band magnitude
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Nomenclature notes:
Objects in Simbad are, for Table 1: <[MBG2008] IRAC JHHMMSS.ss+DDMMSS.s>,
for Table 2: <[MBG2008] 2MASS 6X NNNN>, for Table 3: <[MSH2004] FFNNN> and
for Table 4: <[MBG2008] SSTM1M311 JHHMMSS.ss+DDMMSS.s>.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Jan-2011