A 6.7 GHz Methanol Maser Survey at High Galactic Latitudes

Abstract

We performed a systematic 6.7 GHz Class \uppercase\expandafter{\romannumeral2} methanol maser survey using the Shanghai Tianma Radio Telescope toward targets selected from the all-sky \emph{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${}^{\circ }$. Of 1473 selected \emph{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 (SED) 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 \emph{WISE} images show that almost all of these masers are located in the positions of the bright \emph{WISE} point sources. Compared with 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.

27pages, 8 figures, 3 tables. Published in ApJ

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• A 4-6 GHz Radio Recombination Line Survey in the Milky Way
• 36 GHz methanol lines from nearby galaxies: maser or quasi-thermal emission?
• Planck Galactic Cold Clumps at High Galactic Latitude-A Study with CO Lines
• High-Sensitivity Observations of Molecular Lines with the Arecibo Telescope
• Cyanopolyyne line survey towards high-mass star-forming regions with TMRT
• Discovery of widespread non-metastable ammonia masers in the Milky Way
• Discovery of recurrent flares of 6.7 GHz methanol maser emission in Cepheus A HW2