J/ApJ/680/495 Survey of Interstellar clouds in the Gould belt (Harvey+, 2008)
The Spitzer survey of interstellar clouds in the Gould belt.
I. IC 5146 observed with IRAC and MIPS.
Harvey P.M., Huard T.L., Jorgensen J.K., Gutermuth R.A., Mamajek E.E.,
Bourke T.L., Merin B., Cieza L., Brooke T., Chapman N., Alcala J.M.,
Allen L.E., Evans Ii N.J., Di Francesco J., Kirk J.M.
<Astrophys. J., 680, 495-516 (2008)>
=2008ApJ...680..495H 2008ApJ...680..495H
ADC_Keywords: Photometry, infrared ; YSOs ; Cross identifications ;
Associations, stellar
Keywords: infrared: general - stars: formation
Abstract:
We present observations of two areas totalling 0.57deg2 in the
IC 5146 star-forming region at 3.6, 4.5, 5.8, 8.0, 24, and 70um
observed with the Spitzer Space Telescope. We reexamine the issue of
the distance to this cloud and conclude a value of 950±80pc is
most likely. We compare source counts, colors, and magnitudes in our
observed region to a subset of the SWIRE data that was processed
through our pipeline. We identify more than 200 young stellar object
(YSO) candidates from color-magnitude and color-color diagrams, many
of which were previously unknown. We compare the colors of these YSOs
to the models of Robitaille et al. and perform simple fits to the
SED's to estimate properties of the circumstellar disks likely to
surround the Class II and III sources. We also compare the mid-IR disk
excesses to Hα emission-line data where available. We present a
quantitative description of the degree of clustering, estimate the
star formation efficiency, and discuss the fraction of YSOs in the
region with disks relative to an estimate of the diskless YSO
population. Finally, we compare the YSO distribution to the cold dust
distribution mapped by SCUBA and briefly describe the diffuse emission
likely due to PAHs associated with the HII region.
Description:
Both areas (Core and Northwest, see Figure 1) were observed twice
with Spitzer's IRAC (2006/11/26 and 2004/06/10) and MIPS cameras
(2007/01/09 and 2007/01/06).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 123 132 YSO candidates in IC 5146 based on IRAC and MIPS
table6.dat 121 43 YSO candidates in IC 5146 based on MIPS/2MASS
table7.dat 103 27 YSO candidates in IC 5146 based on IRAC Only
table9.dat 112 678 Spitzer matches to Herbig & Dahm (2002,
Cat. J/AJ/123/304) optical sources
table10.dat 31 86 Disk modeling results in Class II sources
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See also:
J/ApJ/315/104 : Molecular clouds near Gould belt (Taylor+, 1987)
J/A+A/326/211 : T Tau Stars and the Gould Belt near Lupus (Wichmann+, 1997)
J/ApJ/663/1149 : Spitzer survey of Serpens YSO population (Harvey+, 2007)
J/ApJS/185/198 : The Cepheus flare observed with IRAC and MIPS (Kirk+, 2009)
Byte-by-byte Description of file: table[567].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- YSO Running source number
5- 20 A16 --- SSTgbs Source name (HHMMSSss+DDMMSSs) (1)
22- 36 A15 --- Name Simbad name
38- 44 F7.2 mJy F3.6 ? IRAC 3.6um band flux density
46- 51 F6.2 mJy e_F3.6 ? Uncertainty in F3.6
53- 59 F7.2 mJy F4.5 ? IRAC 4.5um band flux density
61- 66 F6.2 mJy e_F4.5 ? Uncertainty in F4.5
68- 74 F7.2 mJy F5.8 ? IRAC 5.8um band flux density
76- 80 F5.2 mJy e_F5.8 ? Uncertainty in F5.8
82- 88 F7.2 mJy F8.0 ? IRAC 8.0um band flux density
90- 94 F5.2 mJy e_F8.0 ? Uncertainty in F8.0
96 A1 --- l_F24 Limit flag on F24 (for table 7 only)
97-103 F7.2 mJy F24 ? MIPS 24um band flux density (IRAC in table 5)
105-110 F6.2 mJy e_F24 ? Uncertainty in F24 (not for table 7)
112-116 I5 mJy F70 ? MIPS 70um band flux density (not for table 7)
118-121 I4 mJy e_F70 ? Uncertainty in F70 (not for table 7)
123 A1 --- f_F70 [a] a = Flux derived by crude deconvolution
(for table 5 only)
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Note (1): SSTgbs JHHMMSSss+DDMMSSs in Simbad.
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/710] Running optical identification
number (1)
5- 7 F3.1 arcsec Off ? Optical/IR positional offset
9- 24 A16 --- SSTgbs Spitzer source match (HHMMSSss+DDMMSSs) (2)
26- 28 I3 --- YSO ? YSO number given in Tables 5-7
30 A1 --- l_F3.6 Limit flag on F3.6
31- 38 F8.3 mJy F3.6 ? IRAC 3.6um band flux density
40- 44 F5.3 mJy e_F3.6 ? Uncertainty in F3.6
46 A1 --- l_F4.5 Limit flag on F4.5
47- 54 F8.3 mJy F4.5 ? IRAC 4.5um band flux density
56- 60 F5.3 mJy e_F4.5 ? Uncertainty in F4.5
62 A1 --- l_F5.8 Limit flag on F5.8
63- 71 F9.3 mJy F5.8 ? IRAC 5.8um band flux density
73- 77 F5.3 mJy e_F5.8 ? Uncertainty in 5.8Flux
79 A1 --- l_F8.0 Limit flag on F8.0
80- 88 F9.3 mJy F8.0 ? IRAC 8.0um band flux density
90- 94 F5.3 mJy e_F8.0 ? Uncertainty in F8.0
96 A1 --- l_F24 Limit flag on F24
97-106 F10.2 mJy F24 ? MIPS 24um band flux density
108-112 F5.2 mJy e_F24 ? Uncertainty in F24
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Note (1): In original table, Objects No. 10, 31, 50, 52, 65, 78, 138, 163,
263, 351, 375 and 636 were present, with no data. These have been
taken off of the table.
Note (2): SSTgbs JHHMMSSss+DDMMSSs in Simbad.
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- YSO Running star identification number
5- 8 F4.1 mag AV The V band extinction
10- 14 F5.2 [solLum] logL Log of the luminosity
16- 19 F4.2 --- disk/* The disk to star luminosity ratio
21- 23 F3.1 um lam-IR Wavelength at which the IR excess begins
25- 28 F4.1 --- IRexc Slope of the IR excess
30- 31 A2 --- SpT Spectral type
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History:
From electronic version of the journal
References:
Kirk et al. Paper II 2009ApJS..185..198K 2009ApJS..185..198K, Cat. J/ApJS/185/198
Peterson et al. Paper III 2011ApJS..194...43P 2011ApJS..194...43P, Cat. J/ApJS/194/43
Spezzi et al. Paper IV 2011ApJ...730...65S 2011ApJ...730...65S
Hatchell et al. Paper V 2012ApJ...754..104H 2012ApJ...754..104H
Broekhoven-Fiene Paper VI 2014ApJ...786...37B 2014ApJ...786...37B
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Mar-2010