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A blind survey of the 6.7 GHz methanol maser line

Published online by Cambridge University Press:  03 August 2017

Marian Szymczak ,
Andrzej J. Kus  and
Grzegorz Hrynek
Marian Szymczak
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, PL-87100 Toruń, Poland
Andrzej J. Kus
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, PL-87100 Toruń, Poland
Grzegorz Hrynek
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, PL-87100 Toruń, Poland

Abstract

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A blind survey for 6.7GHz methanol maser emission has been made with the 32 m Toruń radio telescope. The survey consists of 4,800 spectra on an equilateral triangular grid pattern with each grid point separated by 4.4 covering a field of ∼21 deg2 at galactic longitudes 20° to 40° and galactic latitudes ±0°52. The average sensitivity was 1.6 Jy and the spectral resolution was 0.04kms−1. A total of 99 sources were detected, 28 of which were not found during previous searches of IRAS-selected ultracompact HII regions. The peak flux density of new detections is usually lower than 30 Jy. About half of the methanol masers have no IRAS counterparts within a radius of 2. The nature of these sources is unclear.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 143 - 146
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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