J/ApJS/241/18 A 6.7GHz methanol maser survey. II. |b|<2° (Yang+, 2019)
A 6.7 GHz methanol maser survey.
II. Low Galactic latitudes.
Yang K., Chen X., Shen Z.-Q., Li X.-Q., Wang J.-Z., Jiang D.-R., Li J.,
Dong J., Wu Y.-J., Qiao H.-H.
<Astrophys. J. Suppl. Ser., 241, 18 (2019)>
=2019ApJS..241...18Y 2019ApJS..241...18Y
ADC_Keywords: Masers; Interstellar medium; Radio lines; Photometry, infrared
Keywords: ISM: molecules ; masers ; radio lines: ISM ; stars: formation
Abstract:
We report the results of our systematic survey for Galactic 6.7GHz
Class II CH3OH maser emission toward a sample of young stellar
objects. The survey was conducted with the Shanghai Tianma Radio
Telescope (TMRT). The sample consists of 3348 sources selected from
the all-sky Wide-field Infrared Survey Explorer (WISE) point-source
catalog. We discussed the selection criteria in detail and the
detection results of those at high Galactic latitudes (i.e.,
|b|>2°) in a previous paper (Paper I; Yang+ 2017, J/ApJ/846/160).
Here, we present the results from the survey of those at low Galactic
latitudes, i.e., |b|<2°. Of 1875 selected WISE point sources, 291
positions that were actually associated with 224 sources that were
detected with CH3OH maser emission. Among them, 32 are newly
detected. A majority of the newly detected sources are associated with
bright WISE sources. The majority of the detected sources
(209/224=93.3%) are quite close to the Galactic Plane (|b|<1°) and
lie on the inner spiral arms with positive local standard of rest
velocities. The detection rate and the color-color distribution of our
detection are all matched with our anticipation. Combining with
detections from previous surveys, we compile a catalog of 1085 sources
with 6.7GHz CH3OH maser emission in our Galaxy.
Description:
The sample selection is fully detailed in Paper I (Yang+ 2017,
J/ApJ/846/160).
We performed this 6.7GHz methanol maser survey at low Galactic
latitudes between 2016 June and 2018 January with the Shanghai Tianma
Radio Telescope (TMRT), Shanghai, China.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 91 1875 WISE-selected sources for the Shanghai Tianma Radio
Telescope (TMRT) survey of methanol maser
table3.dat 103 265 192 already detected 6.7GHz methanol masers
table4.dat 238 192 Comparison between the spectral profiles of our
survey and the previous surveys
table6.dat 85 1085 A 6.7GHz CH3OH maser sources catalog
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See also:
VIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)
J/MNRAS/291/261 : Methanol maser of IRAS-selected sources (Walsh+ 1997)
J/A+A/403/1095 : 6.7GHz methanol masers survey of low-mass YSO (Minier+, 2003)
J/A+A/432/737 : General Catalog of 6.7GHz Methanol Masers (Pestalozzi+, 2005)
J/MNRAS/377/571 : GLIMPSE 6.7GHz methanol masers non-det. (Ellingsen+, 2007)
J/ApJ/656/255 : Arecibo methanol maser Galactic plane survey (Pandian+, 2007)
J/ApJS/177/515 : 6cm and 20cm survey of Galactic Center (Law+, 2008)
J/ApJ/702/1615 : CH3OH maser survey of EGOs (Cyganowski+, 2009)
J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)
J/ApJ/717/L133 : Formaldehyde maser flares in IRAS 18566+0408 (Araya+, 2010)
J/AN/333/634 : Torun methanol source catalogue (Szymczak+, 2012)
J/MNRAS/435/400 : ATLASGAL. Properties of compact HII regions (Urquhart+, 2013)
J/A+A/565/A75 : ATLASGAL: dust condensations in Gal. plane (Csengeri+, 2014)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/MNRAS/443/1555 : ATLASGAL massive star forming clumps (Urquhart+, 2014)
J/MNRAS/439/2584 : Southern methanol masers at 36 and 44GHz (Voronkov+, 2014)
J/A+A/600/L10 : Massive cluster progenitors from ATLASGAL (Csengeri+, 2017)
J/A+A/601/A60 : ATLASGAL: Massive cluster progenitors (Csengeri+, 2017)
J/ApJ/846/160 : 6.7GHz Class II methanol maser survey (Yang+, 2017)
J/A+A/617/A89 : G328.2551-0.5321 ALMA images (Csengeri+, 2018)
J/ApJ/854/170 : Methanol (CH3OH) and OH masers in NGC 6334I (Hunter+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1875] Internal index number
6- 16 F11.7 deg GLON [20/185.2] Galactic longitude
18- 27 F10.7 deg GLAT [-2/2] Galactic latitude
29- 30 I2 h RAh Hour of Right Ascension (J2000)
32- 33 I2 min RAm Minute of Right Ascension (J2000)
35- 39 F5.2 s RAs Second of Right Ascension (J2000)
41- 41 A1 --- DE- Sign of the Declination (J2000)
42- 43 I2 deg DEd Degree of Declination (J2000)
45- 46 I2 arcmin DEm Arcminute of Declination (J2000)
48- 51 F4.1 arcsec DEs Arcsecond of Declination (J2000)
53- 58 F6.3 mag W1mag [3.7/16] WISE 3.4 micron band apparent magnitude
60- 65 F6.3 mag W2mag [0.7/12] WISE 4.6 micron band apparent magnitude
67- 72 F6.3 mag W3mag [-3/12] WISE 12 micron band apparent magnitude
74- 79 F6.3 mag W4mag [-6.6/6] WISE 22 micron band apparent magnitude
81- 85 F5.3 mag W1-W2 [2/6.7] WISE (W1-W2) color index
87- 91 F5.3 mag W3-W4 [2/9.7] WISE (W3-W4) color index
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Name Source identifier --GLLL.lll+BB.bbb(Left/Right)
22- 23 I2 h RAh Hour of Right Ascension (J2000) (1)
25- 26 I2 min RAm Minute of Right Ascension (J2000)
28- 32 F5.2 s RAs Second of Right Ascension (J2000)
34 A1 --- DE- Sign of the Declination (J2000)(1)
35- 36 I2 deg DEd Degree of Declination (J2000) (1)
38- 39 I2 arcmin DEm Arcminute of Declination (J2000)
41- 44 F4.1 arcsec DEs Arcsecond of Declination (J2000)
46- 51 F6.2 km/s DeltaVl [-71.4/112.1] Lower velocity interval of
maser emission
53- 58 F6.2 km/s DeltaVh [-68.1/126] Upper velocity interval of
maser emission
60- 65 F6.2 km/s Vpeak [-69.2/121.1] Peak emission velocity
67- 72 F6.2 Jy Sp [0.2/406.2] Peak flux density
74- 79 F6.2 Jy.km/s Si [0.06/455.4] Integrated flux density
81- 90 A10 "Y/M/D" Epoch Observation epoch
92- 96 F5.2 kpc Dist [1.6/15.5]? Kinematic distance estimate (2)
98-103 A6 --- Ref Discovery reference (G1)
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Note (1): For the TMRT observations.
Note (2): Using the Galactic rotation model
(http://bessel.vlbi-astrometry.org/bayesian --
Reid+ 2009ApJ...700..137R 2009ApJ...700..137R and 2014, J/ApJ/783/130).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 20 A20 --- Name Source identifier --GLLL.lll+BB.bbb(Left/Right)
22- 90 A69 --- PName Previous surveys identifiers
92- 97 A6 --- Ref Previous survey reference (G1)
99-238 A140 --- Notes Additional notes
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1085] Internal index number
6- 23 A18 --- Name Source identifier --LLL.lll+BB.bbb(Left)
25- 26 I2 h RAh Hour of Right Ascension (J2000)
28- 29 I2 min RAm Minute of Right Ascension (J2000)
31- 36 F6.3 s RAs Second of Right Ascension (J2000)
38 A1 --- DE- Sign of the Declination (J2000)
39- 40 I2 deg DEd Degree of Declination (J2000)
42- 43 I2 arcmin DEm Arcminute of Declination (J2000)
45- 49 F5.2 arcsec DEs Arcsecond of Declination (J2000)
51- 57 F7.2 km/s DeltaVl [-135.5/151] Lower velocity interval
of maser emission
59- 65 F7.2 km/s DeltaVh [-122/159] Upper velocity interval
of maser emission
67- 73 F7.2 km/s Vpeak [-131.2/157]? Peak emission velocity
75- 81 F7.2 Jy Sp [-1.2/5196]? Peak flux density
83- 85 A3 --- Ref Source reference (1)
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Note (1): Source reference as follows:
MMB = the Parkes MMB survey (Breen+ 2015MNRAS.450.4109B 2015MNRAS.450.4109B);
P05 = Pestalozzi et al. (2005, J/A+A/432/737);
P07 = Pandian et al. (2007, J/ApJ/656/255);
X08 = Xu et al. (2008A&A...485..729X 2008A&A...485..729X);
S12 = Szymczak et al. (2012, J/AN/333/634);
O14 = Olmi et al. (2014A&A...566A..18O 2014A&A...566A..18O);
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Global notes:
Note (G1): Reference as follows:
Parkes = Breen et al. 2015MNRAS.450.4109B 2015MNRAS.450.4109B
Szy12 = Szymczak et al. 2012, J/AN/333/634
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History:
From electronic version of the journal
References:
Yang et al. Paper I. 2017ApJ...846..160Y 2017ApJ...846..160Y Cat. J/ApJ/846/160
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Nov-2019