J/ApJS/248/24 MUSTANG-2 Galactic Plane survey at 3mm (MGPS90) (Ginsburg+, 2020)
The MUSTANG Galactic Plane Survey (MGPS90) pilot.
Ginsburg A., Anderson L.D., Dicker S., Romero C., Svoboda B., Devlin M.,
Galvan-Madrid R., Indebetouw R., Liu H.B., Mason B., Mroczkowski T.,
Armentrout W.P., Bally J., Brogan C., Butterfield N., Hunter T.R.,
Reese E.D., Rosolowsky E., Sarazin C., Shirley Y., Sievers J.,
Stanchfield S.
<Astrophys. J. Suppl. ser., 248, 24 (2020)>
=2020ApJS..248...24G 2020ApJS..248...24G
ADC_Keywords: Surveys; Galactic plane; Millimetric/submm sources; H II regions
Keywords: Surveys ; Star formation ; Star-forming regions ; H II regions ;
Dust continuum emission ; Interstellar dust
Abstract:
We report the results of a pilot program for a Green Bank Telescope
MUSTANG-2 Galactic Plane survey at 3mm (90GHz), MGPS90. The survey
achieves a typical 1σ depth of 1-2mJy/beam with a 9" beam. We
describe the survey parameters, quality assessment process,
cataloging, and comparison with other data sets. We have identified
709 sources over seven observed fields selecting some of the most
prominent millimeter-bright regions between 0°<l<50° (total
area ∼7.5deg2). The majority of these sources have counterparts at
other wavelengths. By applying flux selection criteria to these
sources, we successfully recovered several known hypercompact HII
(HCHII) regions but did not confirm any new ones. We identify 126
sources that have mm-wavelength counterparts but do not have
cm-wavelength counterparts and are therefore candidate HCHII regions;
of these, 10 are morphologically compact and are strong candidates for
new HCHII regions. Given the limited number of candidates in the
extended area in this survey compared to the relatively large numbers
seen in protoclusters W51 and W49, it appears that most HCHII regions
exist within dense protoclusters. Comparing the counts of HCHII to
ultracompact HII (UCHII) regions, we infer the HCHII region lifetime
is 16%-46% that of the UCHII region lifetime. We additionally
separated the 3mm emission into dust and free-free emission by
comparing with archival 870µm and 20cm data. In the selected pilot
fields, most (≳80%) of the 3mm emission comes from plasma, either
through free-free or synchrotron emission.
Description:
MUSTANG-2 is a 215 element bolometer array operating on the 100m
Robert C. Byrd Green Bank Telescope (GBT) with a wide (75-105GHz)
bandwidth and a 4.25' field of view.
We present the first component (observations of Sgr B2, W33, W43,
G34.26+0.15, W49 and W51 fields on 2018 Mar 24, 31, May 1, Jun 15 and
2019 Jan 31) of an ongoing 3mm (90GHz) survey with the MUSTANG-2
instrument on the GBT with a 9" resolution.
Of the 709 total MUSTANG-2 Galactic Plane survey at 3mm (90GHz;
MGPS90) sources, 279 passed our selection criteria that the S/N in the
source was S/N>5 and the peak signal was at least twice that of the
background, Speak>2Sbackground. See Section 3.1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 94 709 MUSTANG-2 source IDs and photometry
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See also:
J/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)
J/ApJS/155/421 : Survey of Galactic Center region at 20cm (Yusef-Zadeh+, 2004)
J/AJ/129/348 : Radio compact HII regions in the Milky Way (Giveon+, 2005)
J/AJ/130/156 : Galactic radio compact HII regions at 1.4GHz (Giveon+, 2005)
J/AJ/131/2525 : MAGPIS 20cm survey (Helfand+, 2006)
J/ApJ/721/137 : The Bolocam Galactic Plane Survey (BGPS) (Bally+, 2010)
J/ApJS/188/123 : The Bolocam Galactic Plane Survey. II. (Rosolowsky+, 2010)
J/ApJS/208/14 : BGPS. IX. Data release 2. (Ginsburg+, 2013)
J/ApJS/208/11 : Red MSX Source Survey: massive protostars (Lumsden+, 2013)
J/A+A/565/A75 : ATLASGAL: dust condensations in Gal. plane (Csengeri+, 2014)
J/MNRAS/443/3388 : IPHAS new extended PNe release 1 (Sabin+, 2014)
J/MNRAS/443/1555 : ATLASGAL massive star forming clumps (Urquhart+, 2014)
J/AJ/149/64 : MIPSGAL 24µm point source catalog (Gutermuth+, 2015)
J/A+A/595/A27 : JVLA images of W51A (Ginsburg+, 2016)
J/A+A/586/A50 : Central Molecular Zone H2CO temp. maps (Ginsburg+, 2016)
J/A+A/591/A149 : Hi-GAL. inner Milky Way: +68≥l≥70 (Molinari+, 2016)
J/MNRAS/469/2163 : JCMT Plane Survey. first complete data release (Eden+, 2017)
J/MNRAS/471/100 : Hi-GAL compact source catalog. -71.0<l<67.0 (Elia+, 2017)
J/A+A/615/A103 : CORNISH project. III. UCHII region catalog (Kalcheva+, 2018)
J/A+A/627/A175 : GLOSTAR. Radio Source Catalogue I (Medina+ 2019)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [0/342] Identifier
5- 10 F6.3 Jy S-D [0.004/17.1] Dendrogram contour-integrated
intensity
12- 18 F7.3 deg GLON Dendrogram moment-1 Galactic longitude
20- 25 F6.3 deg GLAT [-0.53/0.51] Dendrogram moment-1 Galactic
latitude
27- 31 F5.3 Jy S10 [0.003/3.7] MUSTANG aperture flux
within a 10" aperture
33- 37 F5.3 Jy S15 [0.006/7] MUSTANG aperture flux
within a 15" aperture
39- 44 F6.3 Jy/beam Sbg [-0.02/2.3]?=-9.999 Median background
intensity in 15"-20" annulus
46- 51 F6.3 Jy/beam A-G [0.002/6]?=-9.999 Gaussian fit amplitude
53- 59 F7.3 deg GLON-G ?=-9.999 Gaussian fit Galactic longitude
61- 66 F6.3 deg GLAT-G ?=-9.999 Gaussian fit Galactic latitude
68- 73 F6.3 arcsec FWHM-maj [6.8/27]?=-9.999 Gaussian fit FWHM
along the major axis
75- 80 F6.3 arcsec FWHM-min [6.7/27]?=-9.999 Gaussian fit FWHM
along the minor axis
82- 88 F7.3 deg PA-G [0/360]?=-9.999 Gaussian fit position angle
90- 94 A5 --- Reject Rejected sources (1)
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Note (1): Selection criteria results as follows:
True = Rejected sources with peak SNR<5 or Speak/Sbackground<2
(430 occurrences)
Fasle = peak SNR>5 and Speak/Sbackground>2 (279 occurrences)
See Section 3.1.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Jul-2020