J/ApJ/709/424 HII regions identified with WMAPS and GLIMPSE (Murray+, 2010)
Star formation in massive clusters via the Wilkinson Microwave Anisotropy Probe
and the Spitzer GLIMPSE survey.
Murray N., Rahman M.
<Astrophys. J., 709, 424-435 (2010)>
=2010ApJ...709..424M 2010ApJ...709..424M
ADC_Keywords: H II regions ; Milky Way ; Interstellar medium ;
Infrared sources ; Radio sources
Keywords: Galaxy: fundamental parameters - H II regions - ISM: bubbles -
stars: formation
Abstract:
We use the Wilkinson Microwave Anisotropy Probe (WMAP) maximum entropy
method foreground emission map combined with previously determined
distances to giant HII regions to measure the free-free flux at Earth
and the free-free luminosity of the Galaxy. We find a total flux
fν=54211Jy and a flux from 88 sources of fν=36043Jy. The
bulk of the sources are at least marginally resolved, with mean radii
∼60pc, electron density ne∼9cm-3, and filling factor
ΦHII∼0.005 (over the Galactic gas disk). We use GLIMPSE and
Midcourse Space Experiment (MSX) 8um images to show that the bulk of
the free-free luminosity is associated with bubbles having radii
r∼5-100pc, with a mean of ∼20pc. These bubbles are leaky, so that
ionizing photons emitted inside the bubble escape and excite free-free
emission beyond the bubble walls, producing WMAP sources that are
larger than the 8um bubbles. We suggest that the WMAP sources are the
counterparts of the extended low density HII regions described by
Mezger (1978A&A....70..565M 1978A&A....70..565M). The 18 most luminous WMAP sources emit
half the total Galactic ionizing flux.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 183 Identified H II regions
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
J/A+A/537/A1 : Infrared fluxes of HII regions and PNe (Anderson+, 2012)
J/ApJS/180/283 : WMAP five-year source catalog (Wright+, 2009)
J/ApJ/691/1560 : Dense core survey in the Orion B cloud (Ikeda+, 2009)
J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)
J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)
J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)
J/AJ/126/1423 : MSX 8.3um fluxes of star-forming regions (Kraemer+, 2003)
J/A+AS/25/25 : HII regions of the Northern Milky Way (Dubout-Crillon+ 1976)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 F5.1 deg GLON Galactic Longitude
7- 11 F5.1 deg GLAT Galactic Latitude
13- 16 F4.1 deg a Semi-major Axis
18- 20 F3.1 deg b Semi-minor Axis
22- 25 I4 Jy Flux Integrated Free-Free Flux
27- 30 F4.1 kpc Dist Distance to Source
32- 34 I3 --- [R2003] [1,480]? Source number from Russeil (2003,
Cat. J/A+A/397/133)
36- 37 I2 --- r_Dist ? Other reference for Dist (1)
39- 46 E8.2 10-7W/Hz Lum Free-Free Luminosity; in erg/s/Hz
48- 79 A32 --- Reg ? Associated Region
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Note (1): References to distances are from Table 3 in Russeil, D. (2003,
Cat. J/A+A/397/133; <[R2003] NNN> in Simbad), except for distance
with reference as follows:
1 = Draine, B.T. 1986ApJ...310..408D 1986ApJ...310..408D;
2 = Rodney, S.A., & Reipurth, B. 2008hsf2.book..683R 2008hsf2.book..683R;
3 = Fich, M., & Blitz, L. 1984ApJ...279..125F 1984ApJ...279..125F;
4 = Hanson, M.M. 2003ApJ...597..957H 2003ApJ...597..957H;
5 = Foster, T., & Routledge, D. 2001A&A...367..635F 2001A&A...367..635F;
6 = unknown source;
7 = Jorgensen, J.K., et al. 2006ApJ...645.1246J 2006ApJ...645.1246J;
8 = Ikeda, N. et al., 2009, Cat. J/ApJ/691/1560;
9 = unknown source;
10 = Combi, J.A., et al. 1995A&A...296..514C 1995A&A...296..514C
11 = Combi, J.A., et al. 1995A&A...296..514C 1995A&A...296..514C
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Mar-2012