J/A+A/563/A130 GLIMPSE/BGPS 6.7GHz methanol maser survey (Sun+, 2014)
6.7 GHz methanol maser survey toward GLIMPSE point sources and BGPS 1.1 mm
dust clumps.
Sun Y., Xu Y., Chen X., Zhang B., Wu Y.-W., Henkel C., Brunthaler A.,
Choi Y.K., Zheng X.-W.
<Astron. Astrophys., 563, A130-130 (2014)>
=2014A&A...563A.130S 2014A&A...563A.130S
ADC_Keywords: Masers ; Radio sources ; Photometry, millimetric/submm
Keywords: masers - stars: formation - ISM: molecules - radio lines: ISM -
infrared: ISM
Abstract:
We present the results of a 6.7GHz methanol maser survey from the
Effelsberg 100m radio telescope. A sample of 404 sources from the
Bolocam Galactic Plane Survey (BGPS) 1.1mm dust clump survey that met
specific Galactic Legacy Infrared Mid-Plane Survey Extraodinaire
(GLIMPSE) point-source color criteria was selected and 318 of these
were observed. The new observations resulted in the detection of 29
methanol masers, including 12 new ones. Together with the additional
74 detections from the literature, this means that a total of 103
methanol masers are coincident with 1.1mm dust clumps, yielding an
overall detection rate of 26%. A comparison of the properties of a
1.1mm dust clump and a 6.7GHz methanol maser indicates that methanol
masers with a higher flux density and/or luminosity are generally
associated with more massive but less dense 1.1mm dust clumps. The
overall detection rate of 26% appears to vary as a function of the
derived H2 column density of the associated 1.1mm dust clump. The
methanol masers were primarily detected toward the brighter and more
massive 1.1mm dust clumps. A subsample of 194 sources that overlapped
sources with observations of the 95GHz methanol line was investigated
in more detail for the properties of 1.1mm dust clumps. The
statistical analysis reveals that 1.1mm dust clumps with both class I
and II counterparts have much higher mean and median values of mass,
column density, and flux density than those with only class I or II
counterparts. Based on our much larger sample, we slightly revise the
boundary defined previously for selecting BGPS sources associated with
a class II methanol maser, wherein ∼80% of expected class II methanol
masers will be detected with a detection rate in the range of 40-50%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 129 404 Parameters of the target Bolocam Galactic Plane
Survey (BGPS) and GLIMPSE sources
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
J/ApJ/721/137 : The Bolocam Galactic Plane Survey (BGPS) (Bally+, 2010)
J/ApJS/200/5 : 95GHz class I methanol maser survey (Chen+, 2012)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- PID [1031/6501] ID number of BGPS source (from
Rosolowsky et al., 2010, Cat. J/ApJS/188/123)
5 A1 --- f_PID [C] C for sources overlapped with Chen et al.
2012, Cat. J/ApJS/200/5
6 A1 --- n_PID [*+] Note on PID (1)
9- 23 A15 --- BGPS BGPS source name (GLLL.lll+BB.bbb)
25- 26 I2 h RAh 1.1mm emission peak right ascension (J2000)
28- 29 I2 min RAm 1.1mm emission peak right ascension (J2000)
31- 35 F5.2 s RAs 1.1mm emission peak right ascension (J2000)
37 A1 --- DE- 1.1mm emission peak declination sign (J2000)
38- 39 I2 deg DEd 1.1mm emission peak declination (J2000)
41- 42 I2 arcmin DEm 1.1mm emission peak declination (J2000)
44- 47 F4.1 arcsec DEs 1.1mm emission peak declination (J2000)
49- 54 F6.2 arcsec R ?=- Radius of BGPS source, sources unresolved
by BGPS are indicated with "---"
56- 60 F5.3 Jy S40 Aperture flux density at 1.1mm within 40" of
BGPS source (2)
62- 66 F5.3 Jy e_S40 rms uncertainty on S40
68- 73 F6.3 Jy Sint Integrated flux density at 1.1mm of
BGPS source (2)
75- 79 F5.3 Jy e_Sint rms uncertainty on Sint
81- 85 F5.2 10+22cm-2 NH2 Beam-averaged H2 column density of
BGPS source
87- 91 F5.2 mag [3.6] GLIMPSE point source 3.6um magnitude
93- 96 F4.2 mag e_[3.6] rms uncertainty on [3.6]
98-102 F5.2 mag [4.5] GLIMPSE point source 4.5um magnitude
104-107 F4.2 mag e_[4.5] rms uncertainty on [4.5]
109-113 F5.2 mag [5.8] GLIMPSE point source 5.8um magnitude
115-118 F4.2 mag e_[5.8] rms uncertainty on [5.8]
120-124 F5.2 mag [8.0] GLIMPSE point source 8.0um magnitude
126-129 F4.2 mag e_[8.0] rms uncertainty on [8.0]
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Note (1): Flags as follows:
* = sources overlapped with previous methanol maser detections
+ = sources without valid data due to the amount of available observation time
Note (2): Note that a flux calibration correction factor of 1.5 needs to be
applied to both the aperture and integrated flux densities listed here to
calculate gas mass and column/volume density.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-May-2014