J/AJ/140/462 Intermediate-mass star-forming regions (Arvidsson+, 2010)
A sample of intermediate-mass star-forming regions: making stars at mass
column densities <1 g/cm2.
Arvidsson K., Kerton C.R., Alexander M.J., Kobulnicky H.A., Uzpen B.
<Astron. J., 140, 462-479 (2010)>
=2010AJ....140..462A 2010AJ....140..462A
ADC_Keywords: Associations, stellar ; H II regions ; Infrared sources ;
Galactic plane
Keywords: H II regions - ISM: clouds - stars: formation -
surveys (BGPS, GLIMPSE, GRS, IRAS, MIPSGAL, NVSS)
Abstract:
In an effort to understand the factors that govern the transition from
low- to high-mass star formation, for the first time we identify a
sample of intermediate-mass star-forming regions (IM SFRs) where stars
up to (but not exceeding) ∼8M☉ are being produced. We use IRAS
colors and Spitzer Space Telescope mid-IR images, in conjunction with
millimeter continuum and 13CO maps, to compile a sample of 50 IM
SFRs in the inner Galaxy. These are likely to be precursors to Herbig
AeBe stars and their associated clusters of low-mass stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 95 50 IM SFRs - Properties of blobs and shells
table4.dat 99 50 IM SFRs - Photometry and luminosity
table5.dat 75 42 IM SFRs - Molecular material from the GRS
(Galactic Ring Survey, Jackson 2006ApJS..163..145J 2006ApJS..163..145J)
table6.dat 65 50 IM SFRs - Molecular material from the BGPS
(Bolocam Galactic Plane Survey, see J/ApJS/188/123)
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See also:
J/ApJ/699/1153 : Kinematic dist. to GRS molecular clouds (Roman-Duval+, 2009)
J/ApJS/182/131 : Molecular clouds and clumps in the GRS (Rathborne+, 2009)
J/ApJS/188/123 : The Bolocam Galactic Plane Survey. II. (Rosolowsky+, 2010)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS Name
11- 12 A2 --- m_IRAS [-NS ] Multiplicity index on IRAS
14- 21 F8.5 deg GLON Galactic longitude
23- 30 F8.5 deg GLAT Galactic latitude
32- 34 F3.1 arcsec theta Angular diameter θ
36- 40 F5.1 km/s Vlsr ? Associated CO velocity from the GRS
(Jackson et al., 2006ApJS..163..145J 2006ApJS..163..145J)
42- 45 F4.1 km/s dV ? Width of the associated CO feature ΔV
47- 49 F3.1 kpc dnear ? Near distance
51- 54 F4.1 kpc dfar ? Far distance
56- 59 F4.1 kpc Dist ? Adopted distance used in subsequent analysis
61- 65 A5 --- Flag Flag (G1)
67- 69 F3.1 pc Diam ? Diameter, calculated using the adopted
distance
70 A1 --- --- [/]
71- 73 F3.1 pc Diam2 ? Second diameter, calculated using the
adopted distance
75- 79 F5.1 10+3Lsun LIR ? Infrared luminosity (taken from table4)
80 A1 --- --- [/]
81- 84 F4.1 10+3Lsun LIR2 ? Second infrared luminosity
(taken from table4)
86- 89 I4 Msun MLTE ? LTE mass (taken from table5)
90 A1 --- --- [/]
91- 95 I5 Msun MLTE2 ? Second LTE mass (taken from table5)
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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- 10 A10 --- IRAS IRAS Name
11- 12 A2 --- m_IRAS [-NS ] Multiplicity index on IRAS
14- 16 I3 arcsec Ap Aperture radius
18- 21 F4.2 Jy F3.6 Spitzer/IRAC 3.6um flux density
23- 26 F4.2 Jy e_F3.6 1σ total uncertainty on F3.6
28- 31 F4.2 Jy F4.5 Spitzer/IRAC 4.5um flux density
33- 36 F4.2 Jy e_F4.5 1σ total uncertainty on F4.5
38- 42 F5.2 Jy F5.8 Spitzer/IRAC 5.8um flux density
44- 47 F4.2 Jy e_F5.8 1σ total uncertainty on F5.8
49- 53 F5.2 Jy F8.0 Spitzer/IRAC 8.0um flux density
55- 58 F4.2 Jy e_F8.0 1σ total uncertainty on F8.0
60- 64 F5.2 Jy F24 Spitzer/MIPS 24um flux density
66- 69 F4.2 Jy e_F24 1σ total uncertainty on F24
71- 75 F5.1 Jy F60 IRAS PSC 60um flux density
77- 82 F6.1 Jy F100 IRAS PSC 100um flux density
84- 88 A5 --- Flag Flag (G1)
90- 94 F5.2 10+3Lsun Lnear ? Near luminosity calculated using the near
distance in table3
95- 99 F5.1 10+3Lsun Lfar ? Far luminosity calculated using the far
distance in table3
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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- 10 A10 --- IRAS IRAS Name
11- 12 A2 --- m_IRAS [-NS ] Multiplicity index on IRAS
14- 17 F4.1 K.km/s Ipeak Peak integrated flux
19- 22 F4.1 10+21cm-2 N(H2)p Peak H2 column density
24- 27 F4.2 g/cm2 N(M)p Peak mass column density
29- 32 F4.1 10-7sr Omega Solid angle occupied by the CO clump
(used to calculate the mass)
34 A1 --- Flag Flag (G1)
36- 39 I4 Msun M1near Near distance clump mass (LTE)
41- 45 I5 Msun M1far Far distance clump mass (LTE)
47- 59 A13 --- GRSMC Parent GRS molecular clump, GLLL.ll+BB.bb
(Rathborne et al., Cat. J/ApJS/182/131)
61- 62 A2 --- Clump Asociated GRSMC-clump
64- 69 I6 Msun Mcld ? Mass of the GRSMC (1)
71- 75 A5 --- Note Note (2)
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Note (1): Cloud masses are calculated using L(13CO) from Roman-Duval et al.
(2009, Cat. J/ApJ/699/1153), and conversion factors from Simon et al.
(2001ApJ...551..747S 2001ApJ...551..747S) and references therein.
Note (2): telling what distance Roman-Duval et al. (2009, Cat. J/ApJ/699/1153)
put the cloud (F=Far, N=Near, T=Total). (!) indicates where that distance
determination differs from the standard ruler method used in this paper.
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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- 10 A10 --- IRAS IRAS Name
11- 12 A2 --- m_IRAS [-NS ] Multiplicity index on IRAS
14- 28 A15 --- BGPS BGPS designation (GLLL.ll+BB.bb), Rosolowsky
et al., 2010, Cat. J/ApJS/188/123
30- 33 F4.2 Jy Fp ? Peak flux, in Jy/beam
35- 39 F5.1 10+21cm-2 N(H2)p ? Peak H2 column density
41- 44 F4.2 g/cm2 N(M)p ? Peak mass column density
46- 48 F3.1 Jy S ? Integrated flux density at 268GHz (1.1mm)
from the BGPS catalog (Rosolowsky et al.,
2010, Cat. J/ApJS/188/123)
50- 54 A5 --- Flag Flag (G1)
56- 59 I4 Msun M2near ? Near distance BGPS mass
61- 65 I5 Msun M2far ? Far distance BGPS mass
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Global notes:
Note (G1): Flags as follows:
N = for near
F = for far
T = for tangent point
U = for unassigned
A = for ambiguous CO association
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Jun-2012