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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The evolutionary status of protostellar clumps hosting class II methanol masers

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Author(s):
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Jones, B. M. [1] ; Fuller, G. A. [1, 2] ; Breen, S. L. [3, 4] ; Avison, A. [1, 2] ; Green, J. A. [5] ; Traficante, A. [6] ; Elia, D. [6] ; Ellingsen, S. P. [7] ; Voronkov, M. A. [8] ; Merello, M. [9, 6] ; Molinari, S. [6] ; Schisano, E. [6]
Total Authors: 12
Affiliation:
[1] Univ Manchester, Ctr Astrophys, Sch Nat Sci, Dept Phys & Astron, Jodrell Bank, Manchester M13 9PL, Lancs - England
[2] UK ALMA Reg Ctr Node, Manchester M13 9PL, Lancs - England
[3] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006 - Australia
[4] SKA Org, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire - England
[5] CSIRO Astron & Space Sci, 26 Dick Perry Ave, Kensington, WA 6151 - Australia
[6] IAPS INAF, Via Fosso del Cavaliere 100, I-00133 Rome - Italy
[7] Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001 - Australia
[8] CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Box 76, Epping, NSW 1710 - Australia
[9] Univ Sao Paulo, IAG Rua Matao 1226, Cidade Univ, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 9
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 493, n. 2, p. 2015-2041, APR 2020.
Web of Science Citations: 0
Abstract

The Methanol MultiBeam survey (MMB) provides the most complete sample of Galactic massive young stellar objects (MYSOs) hosting 6.7GHz class II methanol masers. We characterize the properties of these maser sources using dust emission detected by the Herschel Infrared Galactic Plane Survey (Hi-GAL) to assess their evolutionary state. Associating 731 (73 percent) of MMB sources with compact emission at four Hi-GAL wavelengths, we derive clump properties and define the requirements of an MYSO to host a 6.7 GHz maser. The median far-infrared (FIR) mass and luminosity are 630 M-circle dot and 2500 L-circle dot for sources on the near side of Galactic centre and 3200 M-circle dot and 10000 L-circle dot for more distant sources. The median luminosity-to-mass ratio is similar for both at similar to 4.2 L circle dot M circle dot-1. We identify an apparent minimum 70 mu m luminosity required to sustain a methanol maser of a given luminosity (with L-70 proportional to L-6(.7)0.6). The maser host clumps have higher mass and higher FIR luminosities than the general Galactic population of protostellar MYSOs. Using principal component analysis, we find 896 protostellar clumps satisfy the requirements to host a methanol maser but lack a detection in the MMB. Finding a 70 mu m flux density deficiency in these objects, we favour the scenario in which these objects are evolved beyond the age where a luminous 6.7 GHz maser can be sustained. Finally, segregation by association with secondary maser species identifies evolutionary differences within the population of 6.7GHz sources. (AU)

FAPESP's process: 17/23708-0 - 183 GHz H2O Megamaser galaxies and intensity Calibrations
Grantee:Manuel Antonio Merello Ferrada
Support type: Scholarships in Brazil - Post-Doctorate