Discovery of periodic methanol masers associated with G323.46-0.08

Abstract

The 6.7 GHz methanol masers associated with G323.46−0.08 have undergone significant change since their discovery in 1992. After 2009 April, new features with a peak flux density of ∼500 Jy in the velocity channel v = −68.35 km s−1, in the velocity range from −71 to −68.5 km s−1 were detected. It is suggestive that it experienced an accretion event similar to that reported in S255-NIRS3 and NGC 6334I. Evidence of periodicity is found in all of the associated methanol masers with a period of ∼93.5 d. It is not possible to determine if this source was periodic before 2017. However, all the 6.7 GHz methanol masers are probably amplifying a common background periodic radio source.

Metadata

Authors/Creators:

Proven-Adzri, E
MacLeod, GC
van den Heever, SP
Hoare, MG https://orcid.org/0000-0003-2684-399X
Kuditcher, A
Goedhart, S

© The Author(s) 2019. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

Keywords:

masers; stars: formation; stars: protostars; ISM: individual objects: G323.46-0.08; ISM: molecules; radio lines: ISM

Dates: