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Class II 6.7 GHz Methanol Maser Association with Young Massive Cores Revealed by ALMA

Published online by Cambridge University Press:  16 July 2018

James O. Chibueze
Affiliation:
SKA Africa, 3rd Floor, The Park, Park Road, Pinelands, Cape Town, 7405, South Africa email: jchibueze@ska.ac.za Department of Physics and Astronomy, Faculty of Physical Sciences, University of Nigeria, Carver Building, 1 University Road, Nsukka, Nigeria Space Research Unit, Physics Department, NorthWest University, Private Bag X6001, Potchefstroom, 2520, South Africa
Timea Csengeri
Affiliation:
Max Planck Institute for Radioastronomy, Auf dem Hügel 69, 53121 Bonn, Germany email: tcsengeri@mpifr-bonn.mpg.de
Ken’ichi Tatematsu
Affiliation:
National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Tetsuo Hasegawa
Affiliation:
National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Satoru Iguchi
Affiliation:
National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Jibrin A. Alhassan
Affiliation:
Department of Physics and Astronomy, Faculty of Physical Sciences, University of Nigeria, Carver Building, 1 University Road, Nsukka, Nigeria
Aya E. Higuchi
Affiliation:
The Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
Sylvain Bontemps
Affiliation:
The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Karl M. Menten
Affiliation:
Max Planck Institute for Radioastronomy, Auf dem Hügel 69, 53121 Bonn, Germany email: tcsengeri@mpifr-bonn.mpg.de
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Abstract

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The association of 6.7 GHz class II methanol (CH3OH) masers with ATLASGAL/ ALMA 0.9 mm massive dense cores is presented in this work from a statistical viewpoint. 42 of the 112 cores (37.5%) detected with the Atacama Compact Array (ACA) excite 6.7 GHz CH3OH masers. ACA cores have offsets 0\rlap.″17 to 4\rlap.″79 from the methanol multibeam survey (MMB), with a median of 2.″19. Approximately 90% of the MMB-associated cores are of masses > 40 M. Because all the cores show evidence of outflow activity, and only a fraction of the cores excited CH3OH masers, we suggest that outflows precede the emergence of maser emission. This first ALMA survey of massive dense cores combined with the MMB survey along with other maser specie surveys is a promising tool to trace the evolutionary sequence of high-mass stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

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