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J/ApJ/846/160        6.7GHz Class II methanol maser survey        (Yang+, 2017)

A 6.7GHz methanol maser survey at high galactic latitudes. Yang K., Chen Xi, Shen Z.-Q., Li X.-Q., Wang J.-Z., Jiang D.-R., Li J., Dong J., Wu Y.-J., Qiao H.-H., Ren Z. <Astrophys. J., 846, 160 (2017)> =2017ApJ...846..160Y
ADC_Keywords: Masers ; Radio lines ; Photometry, infrared ; Spectra, radio Keywords: ISM: molecules ; masers ; radio lines: ISM ; stars: formation Abstract: We performed a systematic 6.7GHz Class II methanol maser survey using the Shanghai Tianma Radio Telescope toward targets selected from the all-sky Wide-Field Infrared Survey Explorer (WISE) point catalog. In this paper, we report the results from the survey of those at high Galactic latitudes, i.e., |b|>2°. Of 1473 selected WISE point sources at high latitude, 17 point positions that were actually associated with 12 sources were detected with maser emission, reflecting the rarity (1%-2%) of methanol masers in the region away from the Galactic plane. Out of the 12 sources, 3 are detected for the first time. The spectral energy distribution at infrared bands shows that these new detected masers occur in the massive star-forming regions. Compared to previous detections, the methanol maser changes significantly in both spectral profiles and flux densities. The infrared WISE images show that almost all of these masers are located in the positions of the bright WISE point sources. Compared to the methanol masers at the Galactic plane, these high-latitude methanol masers provide good tracers for investigating the physics and kinematics around massive young stellar objects, because they are believed to be less affected by the surrounding cluster environment. Description: The observations were performed between 2015 September and 2016 July with the Shanghai TianMa radio telescope (TMRT) in China. The rest frequency of the methanol 51 to 60 A+ transition line (6.6685192GHz) was covered with a spectral window of a bandwidth of 23.4MHz. The spectral resolution is 1.431kHz, corresponding to a velocity resolution of ∼0.09km/s. For the detected methanol maser sources (12 in total), we used the on-the-fly (OTF) mode to map a large region (usually 5') to obtain a position of the methanol maser. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 78 1473 Source catalog table3.dat 135 16 The OTF observations
See also: II/328 : AllWISE Data Release (Cutri+ 2013) VIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12) J/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994) J/A+AS/110/81 : Methanol masers towards IRAS sources (van der Walt+ 1995) J/MNRAS/291/261 : Methanol maser of IRAS-selected sources (Walsh+ 1997) J/MNRAS/301/640 : Ultracompact H II regions studies. II. (Walsh+, 1998) J/A+AS/134/115 : Medicina 6.7GHz methanol masers survey (Slysh+ 1999) J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000) J/A+A/403/1095 : 6.7GHz methanol masers survey of YSOs (Minier+, 2003) J/A+A/432/737 : General Cat. of 6.7GHz Methanol Masers (Pestalozzi+, 2005) J/MNRAS/377/571 : GLIMPSE methanol masers non-detections (Ellingsen+, 2007) J/other/PASA/26.454 : Precise positions of methanol masers (Caswell, 2009) J/ApJ/699/1153 : Kinematic dist. to GRS molecular clouds (Roman-Duval+, 2009) J/MNRAS/439/2584 : Southern methanol masers at 36 and 44GHz (Voronkov+, 2014) J/ApJ/833/18 : Ultra-compact HII regions & methanol masers. I. (Hu+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq [1/1473] Index number 6- 12 F7.3 deg GLON Galactic longitude 14- 20 F7.3 deg GLAT Galactic latitude 22- 23 I2 h RAh [0/23] Hour of Right Ascension (J2000) 25- 26 I2 min RAm Minute of Right Ascension (J2000) 28- 31 F4.1 s RAs Second of Right Ascension (J2000) 33 A1 --- DE- Sign of the Declination (J2000) 34- 35 I2 deg DEd [0/79] Degree of Declination (J2000) 37- 38 I2 arcmin DEm Arcminute of Declination (J2000) 40- 43 F4.1 arcsec DEs Arcsecond of Declination (J2000) 45- 49 F5.2 mag w1mag [1.4/16] WISE 3.4 micron band magnitude 51- 55 F5.2 mag w2mag [-1.2/12] WISE 4.6 micron band magnitude 57- 61 F5.2 mag w3mag [-2.2/12] WISE 12 micron band magnitude 63- 67 F5.2 mag w4mag [-5/6] WISE 22 micron band magnitude 69- 73 F5.2 mag w1-w2 [2/10.2] WISE (w1-w2) color index 75- 78 F4.2 mag w3-w4 [2/7.4] WISE (w3-w4) color index
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Fig [1/12] Figure number within figure 6 (1) 4- 18 A15 --- Name Source name (GLL.lll+BB.bbb) 20- 21 I2 h RACh Pointing center hour of Right Ascension (J2000) 23- 24 I2 min RACm Minute of Right Ascension (J2000) 26- 29 F4.1 s RACs Second of Right Ascension (J2000) 31 A1 --- DEC- Pointing center sign of the Declination (J2000) 32- 33 I2 deg DECd Pointing center degree of Declination (J2000) 35- 36 I2 arcmin DECm Arcminute of Declination (J2000) 38- 41 F4.1 arcsec DECs Arcsecond of Declination (J2000) 43 I1 arcmin lth [5/7] Side length of each region for the TMRT OTF observations 45- 55 A11 "Y/M/D" Epoch Epoch of observation 57- 58 I2 h RAh Fitting center hour of Right Ascension (J2000) 60- 61 I2 min RAm Minute of Right Ascension (J2000) 63- 67 F5.2 s RAs Second of Right Ascension (J2000) 69 A1 --- DE- Fitting center sign of the Declination (J2000) 70- 71 I2 deg DEd Fitting center degree of Declination (J2000) 73- 74 I2 arcmin DEm Arcminute of Declination (J2000) 76- 79 F4.1 arcsec DEs Arcsecond of Declination (J2000) 81- 85 F5.1 km/s Vp [-73/21] Velocity peak of emission 87- 91 F5.1 Jy Sp [0.8/839] Peak flux density at 6.7GHz 93- 97 F5.1 Si [0.3/328] Integrated flux density 99-100 I2 h RAIh ? Hour of Right Ascension (J2000) (2) 102-103 I2 min RAIm ? Minute of Right Ascension (J2000) (2) 105-110 F6.3 s RAIs ? Second of Right Ascension (J2000) (2) 112 A1 --- DEI- ? Sign of the Declination (J2000) (2) 113-114 I2 deg DEId ? Degree of Declination (J2000) (2) 116-117 I2 arcmin DEIm ? Arcminute of Declination (J2000) (2) 119-123 F5.2 arcsec DEIs ? Arcsecond of Declination (J2000) (2) 125-130 A6 --- Ref Reference(s) for interferometric positions (3) 132-135 F4.1 arcsec Sep [3/19.4]? Separation between the fitting centers and interferometric positions
Note (1): Figure 6 shows on the left, the velocity-integrated intensity map of the source with maser emission. The "o" represents the position of the WISE source in the single-point survey, and the "+" represents the fitted peak position of the methanol emission from the TMRT OTF observation. On the right: spectra in the fitting center. Note (2): The positions determined by interferometric observation (Hu et al. 2016, J/ApJ/833/18) Note (3): References as follows: H = Hu et al. 2016, J/ApJ/833/18 M = Minier et al. 2000A&A...362.1093M M1 = Minier et al. 2001A&A...369..278M
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-May-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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