J/ApJ/721/137 The Bolocam Galactic Plane Survey (BGPS) (Bally+, 2010)
The Bolocam Galactic Plane Survey: λ = 1.1 and 0.35mm dust continuum
emission in the Galactic center region.
Bally J., Aguirre J., Battersby C., Bradley E.T., Cyganowski C., Dowell D.,
Drosback M., Dunham M.K., Evans II N.J., Ginsburg A., Glenn J., Harvey P.,
Mills E., Merello M., Rosolowsky E., Schlingman W., Shirley Y.L.,
Stringfellow G.S., Walawender J., Williams J.
<Astrophys. J., 721, 137-163 (2010)>
=2010ApJ...721..137B 2010ApJ...721..137B
ADC_Keywords: Interstellar medium ; Galactic plane ; Millimetric/submm sources
Keywords: dust, extinction - Galaxy: center - ISM: clouds - stars: formation -
surveys
Abstract:
The Bolocam Galactic Plane Survey (BGPS) data for a 6deg2 region of
the Galactic plane containing the Galactic center are analyzed and
compared to infrared and radio continuum data. The BGPS 1.1mm emission
consists of clumps interconnected by a network of fainter filaments
surrounding cavities, a few of which are filled with diffuse near-IR
emission indicating the presence of warm dust or with radio continuum
characteristic of HII regions or supernova remnants. New 350um images
of the environments of the two brightest regions, Sgr A and B, are
presented. Sgr B2 is the brightest millimeter-emitting clump in the
Central Molecular Zone (CMZ) and may be forming the closest analog to
a super star cluster in the Galaxy. The CMZ contains the highest
concentration of millimeter- and submillimeter-emitting dense clumps
in the Galaxy. Most 1.1mm features at positive longitudes are seen in
silhouette against the 3.6-24um background observed by the Spitzer
Space Telescope. However, only a few clumps at negative longitudes are
seen in absorption, confirming the hypothesis that positive longitude
clumps in the CMZ tend to be on the near side of the Galactic center,
consistent with the suspected orientation of the central bar in our
Galaxy. The Bolocat catalog of 1.1mm clumps contains 1428 entries in
the Galactic center between l=358.5° and l=4.5° of which about
80% are likely to be within about 500pc of the center.
Description:
The observations reported here were obtained with Bolocam between
2005 June and 2007 July on the CSO 10m diameter telescope. SHARC-II
observations were obtained during the best weather on these observing
runs and in 2008 April. All data were obtained with a 45GHz bandwidth
filter centered at 268GHz (1.1mm). Each bolometer has an effective
Gaussian beam with an FWHM diameter of 31", but the maps presented
here have an effective resolution of 33" due to beam-smearing by the
scanning strategy, data sampling rate, and data reduction as discussed
by Aguirre et al. (2011ApJS..192....4A 2011ApJS..192....4A).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 109 1428 1.1mm masses, column densities, and densities
for 1428 Bolocat clumps
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See also:
J/ApJS/195/14 : The Bolocam Galactic Plane Survey. V. (Schlingman+, 2011)
J/ApJS/188/123 : The Bolocam Galactic Plane Survey. II. (Rosolowsky+, 2010)
J/AJ/138/1380 : Dust clumps in the Galactic Plane (Matthews+, 2009)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Bolocat Galactic Plane Survey clump number (1)
6- 12 F7.3 deg GLON Galactic longitude
14- 19 F6.3 deg GLAT Galactic latitude
21- 27 F7.3 deg RAdeg Right Ascension in decimal degrees (J2000)
29- 35 F7.3 deg DEdeg Declination in decimal degrees (J2000)
37- 43 F7.1 Msun M40 Mass estimate from 40" aperture (2)
45- 51 E7.2 cm-2 N40 H2 column density from 40" aperture (2)
53- 60 F8.1 cm-3 n40 H2 volume number density from 40" aperture (2)
62- 69 F8.1 Msun Mr Mass estimate from effective beam-deconvolved
area (2)
71- 75 F5.1 arcsec r Effective clump radius
77- 83 E7.2 cm-2 Nr H2 column density from effective
beam-deconvolved area (2)
85- 92 F8.1 cm-3 nr H2 volume number density from effective
beam-deconvolved area (2)
94-101 F8.1 Msun M120 Mass estimate from 120" aperture (2)
103-109 F7.1 Msun Mgrad Mass estimate from 40" aperture assuming a
temperature gradient (3)
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Note (1): From Bolocat V1.0 released in June via the IPAC website at
http://irsa.ipac.caltech.edu/data/BOLOCAM_GPS/
As "Seq" number in Paper II: Rosolowsky et al., 2010,
Cat. J/ApJS/188/123; in Simbad.
Note (2): Assuming a dust temperature of 20K.
Note (3): Temperature gradient that declines as a power-law with distance from
Sgr A*. The power-law has a slope γg=0.2 and is normalized
to have T=50K at a distance of 10pc from Sgr A*. This power-law
implies T=27.5K at d=200pc from Sgr A*, 15.5K at d=3kpc,
and 12.5K at d=8.5kpc. See discussion in Section 3.1.
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History:
From electronic version of the journal
References:
Aguirre et al. Paper I. 2011ApJS..192....4A 2011ApJS..192....4A
Rosolowsky et al. Paper II. 2010ApJS..188..123R 2010ApJS..188..123R Cat. J/ApJS/188/123
Dunham et al. Paper III. 2010ApJ...717.1157D 2010ApJ...717.1157D
Schlingman et al. Paper V. 2011ApJS..195...14S 2011ApJS..195...14S Cat. J/ApJS/195/14
Dunham et al. Paper VI. 2011ApJ...731...90D 2011ApJ...731...90D Cat. J/ApJ/731/90
Dunham et al. Paper VII. 2011ApJ...741..110D 2011ApJ...741..110D Cat. J/ApJ/741/110
Ellsworth-Bowers et al. Paper VIII. 2013ApJ...770...39E 2013ApJ...770...39E
Ginsburg et al. Paper IX. 2013ApJS..208...14G 2013ApJS..208...14G
Shirley et al. Paper X. 2013ApJS..209....2S 2013ApJS..209....2S Cat. J/ApJS/209/2
Merello et al. Paper XI. 2015ApJS..218....1M 2015ApJS..218....1M Cat. J/ApJS/218/1
Ellsworth-Bowers et al. Paper XII. 2015ApJ...799...29E 2015ApJ...799...29E Cat. J/ApJ/799/29
Ellsworth-Bowers et al. Paper XIII. 2015ApJ...805..157E 2015ApJ...805..157E Cat. J/ApJ/805/157
Svoboda et al. Paper XIV. 2016ApJ...822...59S 2016ApJ...822...59S Cat. J/ApJ/822/59
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jul-2012