Ultra-precise monitoring of a class I methanol maser

M. A. Voronkov; S. L. Breen; S. P. Ellingsen; J. A. Green; A. M. Sobolev; S. Yu Parfenov; D. J. Van Der Walt

doi:10.1017/S1743921323001941

Ultra-precise monitoring of a class I methanol maser

M. A. Voronkov, S. L. Breen, S. P. Ellingsen, J. A. Green, A. M. Sobolev, S. Yu Parfenov, D. J. Van Der Walt

Research output: Contribution to journal › Article › peer-review

Abstract

We report the results of a 7-year monitoring program using the Australia Telescope Compact Array (ATCA) for the 9.9 GHz class I methanol maser in G331.13-0.24 where a periodic class II methanol maser is present. The great deal of the project was to control systematics at an unprecedented level. Although no periodic flux variation was found, the maser shows a very stable decline of 166±7 Jy/day. The radial velocity of the maser is stable down to 1 m/s level. We also report a marginal periodic signal in radial velocity (comparable to the level of systematics) of about 20±7 cm/s with the period of 475±22 days, close to that of the 6.7-GHz maser in the source. No hyperfine split was detected which suggests preferential excitation of a single hyperfine transition.

Original language	English
Pages (from-to)	255-257
Number of pages	3
Journal	Proceedings of the International Astronomical Union
Volume	18
DOIs	https://doi.org/10.1017/S1743921323001941
Publication status	Published - 7 Dec 2022
Externally published	Yes

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10.1017/S1743921323001941Licence: CC BY

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title = "Ultra-precise monitoring of a class I methanol maser",

abstract = "We report the results of a 7-year monitoring program using the Australia Telescope Compact Array (ATCA) for the 9.9 GHz class I methanol maser in G331.13-0.24 where a periodic class II methanol maser is present. The great deal of the project was to control systematics at an unprecedented level. Although no periodic flux variation was found, the maser shows a very stable decline of 166±7 Jy/day. The radial velocity of the maser is stable down to 1 m/s level. We also report a marginal periodic signal in radial velocity (comparable to the level of systematics) of about 20±7 cm/s with the period of 475±22 days, close to that of the 6.7-GHz maser in the source. No hyperfine split was detected which suggests preferential excitation of a single hyperfine transition.",

keywords = "Hii regions, masers, stars: formation",

author = "Voronkov, {M. A.} and Breen, {S. L.} and Ellingsen, {S. P.} and Green, {J. A.} and Sobolev, {A. M.} and {Yu Parfenov}, S. and {Van Der Walt}, {D. J.}",

note = "Publisher Copyright: {\textcopyright} The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union.",

year = "2022",

month = dec,

day = "7",

doi = "10.1017/S1743921323001941",

language = "English",

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journal = "Proceedings of the International Astronomical Union",

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TY - JOUR

T1 - Ultra-precise monitoring of a class I methanol maser

AU - Voronkov, M. A.

AU - Breen, S. L.

AU - Ellingsen, S. P.

AU - Green, J. A.

AU - Sobolev, A. M.

AU - Yu Parfenov, S.

AU - Van Der Walt, D. J.

N1 - Publisher Copyright: © The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union.

PY - 2022/12/7

Y1 - 2022/12/7

N2 - We report the results of a 7-year monitoring program using the Australia Telescope Compact Array (ATCA) for the 9.9 GHz class I methanol maser in G331.13-0.24 where a periodic class II methanol maser is present. The great deal of the project was to control systematics at an unprecedented level. Although no periodic flux variation was found, the maser shows a very stable decline of 166±7 Jy/day. The radial velocity of the maser is stable down to 1 m/s level. We also report a marginal periodic signal in radial velocity (comparable to the level of systematics) of about 20±7 cm/s with the period of 475±22 days, close to that of the 6.7-GHz maser in the source. No hyperfine split was detected which suggests preferential excitation of a single hyperfine transition.

AB - We report the results of a 7-year monitoring program using the Australia Telescope Compact Array (ATCA) for the 9.9 GHz class I methanol maser in G331.13-0.24 where a periodic class II methanol maser is present. The great deal of the project was to control systematics at an unprecedented level. Although no periodic flux variation was found, the maser shows a very stable decline of 166±7 Jy/day. The radial velocity of the maser is stable down to 1 m/s level. We also report a marginal periodic signal in radial velocity (comparable to the level of systematics) of about 20±7 cm/s with the period of 475±22 days, close to that of the 6.7-GHz maser in the source. No hyperfine split was detected which suggests preferential excitation of a single hyperfine transition.

KW - Hii regions

KW - masers

KW - stars: formation

UR - http://www.scopus.com/inward/record.url?scp=85185759344&partnerID=8YFLogxK

U2 - 10.1017/S1743921323001941

DO - 10.1017/S1743921323001941

M3 - Article

AN - SCOPUS:85185759344

SN - 1743-9213

VL - 18

SP - 255

EP - 257

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

ER -

Ultra-precise monitoring of a class I methanol maser

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