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Interferometric and single-dish observations of 44, 84 and 95 GHz Class I methanol masers

Published online by Cambridge University Press:  16 July 2018

Carolina B. Rodríguez-Garza ,
Stanley E. Kurtz ,
Arturo I. Gómez-Ruiz ,
Peter Hofner ,
Esteban D. Araya  and
Sergei V. Kalenskii
Carolina B. Rodríguez-Garza
Affiliation:
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Morelia, Michoacán, México, C. P. 58089 email: ca.rodriguez@irya.unam.mx
Stanley E. Kurtz
Affiliation:
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Morelia, Michoacán, México, C. P. 58089 email: ca.rodriguez@irya.unam.mx
Arturo I. Gómez-Ruiz
Affiliation:
Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis E. Erro 1, Tonantzintla, Puebla, C.P. 72840, México
Peter Hofner
Affiliation:
Physics Department, New Mexico Tech 801 Leroy Pl., Socorro, NM 87801, USA Adjunct Astronomer at the National Radio Astronomy Observatory1003 Lopezville Road, Socorro, NM 87801, USA
Esteban D. Araya
Affiliation:
Physics Department, Western Illinois University1 University Circle, Macomb, IL 61455, USA
Sergei V. Kalenskii
Affiliation:
Astro Space Center, Lebedev Physical InstituteProfsoyuznaya 84/32, Moscow, 117997, Russia
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Abstract

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We present observations of massive star-forming regions selected from the IRAS Point Source Catalog. The observations were made with the Very Large Array and the Large Millimeter Telescope to search for Class I methanol masers. We made interferometric observations of 125 massive star-forming regions in the 44 GHz methanol maser transition; 53 of the 125 fields showed emission. The data allow us to demonstrate associations, at arcsecond precision, of the Class I maser emission with outflows, HII regions and shocks traced by 4.5 μm emission. We made single-dish observations toward 38 of the 53 regions with 44 GHz masers detected to search for the methanol transitions at 84.5, 95.1, 96.7, 107.0, and 108.8 GHz. We find detection rates of 74, 55, 100, 3, and 45%, respectively. We used a wide-band receiver which revealed many other spectral lines that are common in star-forming regions.

Keywords

stars: formationstars: massivestars: protostarsISM: masersISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 239 - 242
Copyright
Copyright © International Astronomical Union 2018 

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