J/ApJ/694/546 IR dust bubbles. II. YSOs model parameters (Watson+, 2009)
IR dust bubbles.
II. Probing the detailed structure and young massive stellar populations of
galactic H II regions.
Watson C., Corn T., Churchwell E.B., Babler B.L., Povich M.S., Meade M.R.,
Whitney B.A.
<Astrophys. J., 694, 546-555 (2009)>
=2009ApJ...694..546W 2009ApJ...694..546W
ADC_Keywords: Interstellar medium ; YSOs ; Stars, masses ; Infrared sources ;
Surveys ; Accretion
Keywords: H II regions - infrared: stars - stars: formation
Abstract:
We present an analysis of late-O/early-B-powered, parsec-sized bubbles
and associated star formation using Two Micron All Sky Survey,
GLIMPSE, MIPSGAL, and MAGPIS surveys. Three bubbles were selected from
the Churchwell et al. catalog (2007, Cat. J/ApJ/670/428). We confirm
that the structure identified in Watson et al. (2008ApJ...681.1341W 2008ApJ...681.1341W)
holds in less energetic bubbles, i.e., a photodissociated region,
identified by 8um emission due to polycyclic aromatic hydrocarbons
surrounding hot dust, identified by 24um emission and ionized gas, and
identified by 20cm continuum. We estimate the dynamical age of two
bubbles by comparing bubble sizes to numerical models of Hosokawa and
Inutsuka. We also identify and analyze candidate young stellar objects
using spectral energy distribution (SED) fitting and identify sites of
possible triggered star formation. Lastly, we identify likely ionizing
sources for two sources based on SED fitting.
Description:
GLIMPSE Point-Source Catalog (GPSC) is a 99.5% reliable catalog of
point sources observed in the Spitzer-IRAC bands (3.6, 4.5, 5.8, and
8.0um). IRAC has a resolution of 1.5-1.9".
MIPSGAL is a survey of the same region as GLIMPSE, using the MIPS
instrument (24um and 70um) on Spitzer. MIPSGAL has a resolution of
6" at 24um and 18" at 70um.
MAGPIS (Multi-Array Galactic Plane Imaging Survey) is a survey of the
Galactic plane at 20cm and 6cm using the VLA in configurations B, C,
and D combined with the Effelsburg 100m single-dish telescope. MAGPIS
has a resolution of 6" at both wavelengths.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 115 Model parameters for candidate YSOs
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/131/2525 : MAGPIS 20cm survey (Helfand+, 2006)
J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)
J/ApJ/670/1115 : IRS spectra at 38 positions in Galactic center (Simpson+,
2007)
J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)
http://www.astro.wisc.edu/glimpse/ : GLIMPSE home page
http://third.ucllnl.org/gps/index.html : MAGPIS home page
http://mipsgal.ipac.caltech.edu/ : MIPSGAL home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [WCC2009] Star identification (C[NS]NNN-NN) (1)
10- 25 A16 --- Name Name (GLLL.llll+B.bbbb) (1)
27- 30 F4.1 Msun Mmin Minimum stellar mass
32- 35 F4.1 Msun Mmax Maximum stellar mass
37- 41 I5 Lsun Ltmin Minimum total luminosity
43- 48 I6 Lsun Ltmax Maximum total luminosity
50- 56 E7.3 Msun/yr Memin ?=0 Minimum envelope accretion rate
58- 64 E7.3 Msun/yr Memax ?=0 Maximum envelope accretion rate
66- 68 A3 --- Stage ? YSO class (I to III)
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Note (1): Some of these candidate YSOs are likely foreground or background YSOs
unassociated with the bubble as Povich et al. (2008ApJ...689..242P 2008ApJ...689..242P)
found toward the M17 complex. By analyzing an off-source control
sample using the SKY model of IR point sources, they concluded that a
majority of the contaminates were YSOs at unknown distances. We expect
that the contamination of our sample with foreground or background
sources would be higher at low galactic longitudes, since the LOS
covers more volume than the earlier analysis. For these sources, the
properties given in Table 1 are incorrect.
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History:
From electronic version of the journal
References:
Watson et al. Paper I. 2008ApJ...681.1341W 2008ApJ...681.1341W
(End) Emmanuelle Perret [CDS] 18-Mar-2011