Two periods instead of one in a single 6.7 GHz methanol maser feature in G9.62+0.20E

被引：4

作者：

MacLeod, G. C. ^{[1
,2
]}

Yonekura, Y. ^{[3
]}

Tanabe, Y. ^{[3
]}

Baan, W. A. ^{[4
,5
]}

Brogan, C. L. ^{[6
]}

Burns, R. A. ^{[7
]}

Chibueze, J. O. ^{[8
,9
]}

Houde, M. ^{[10
]}

Hunter, T. R. ^{[6
]}

Kurtz, S. E. ^{[11
]}

Rajabi, F. ^{[12
]}

Smits, D. P. ^{[13
]}

Stecklum, B. ^{[14
]}

Sugiyama, K. ^{[15
]}

机构：

[1] Open Univ Tanzania, Dept Phys Sci, POB 23409, Dar Es Salaam, Tanzania

[2] Hartebeesthoek Radio Astron Observ, POB 443, ZA-741 Krugersdorp, South Africa

[3] Ibaraki Univ, Ctr Astron, 2-1-1 Bunkyo, Mito, Ibaraki 3108512, Japan

[4] Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China

[5] Netherlands Inst Radio Astron, ASTRON, NL-7991 PD Dwingeloo, Netherlands

[6] NRAO, 520 Eiigemont Rd, Charlottesville, VA 22903 USA

[7] Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[8] North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa

[9] Univ Nigeria, Fac Phys Sci, Dept Phys & Astron, Carver Bldg,1 Univ Rd, Nsukka 410001, Nigeria

[10] Univ Western Ontario, Dept Phys & Astron, 1151 Richmond St, London, ON N6A 3K7, Canada

[11] Univ Nacl Autonoma Mexico, Inst Radioastron & Astrophys, Antigua Carretera Patzcuaro 8701, Morelia 58089, Michoacan, Mexico

[12] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[13] Univ South Africa, Dept Math Sci, Private Bag X6, ZA-1709 Florida, South Africa

[14] Thuringer Landessternwarte, Sternwarte 5, D-07778 Tauteriburg, Germany

[15] Natl Astron Res Inst Thailand, 260 Moo 4, Chiang Mai 50180, Thailand

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 516卷 / 01期

关键词：

masers; stars: formation; stars: protostars; ISM: individual objects: G9.62+0.20E; ISM: molecules; radio lines: ISM; H II REGIONS; VARIABILITY; ENVIRONMENT; PULSATION; DISCOVERY;

D O I：

10.1093/mnrasl/slac083

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The source G9.62+0.20E surprises yet again! Analysis of the associated methanol maser feature at v lsr = +8.8 km s(-1) revealed a second period of P = 52.1 +/- 0.3 d, along with the previously reported period P = 243 d for this source. Various explanations, harmonic flaring, Dicke's superradiance, a secondary pulsation, or two different periodically varying radio sources in the field of view with associated methanol masers are presented. The latter two hypotheses appear more plausible but it is not clear which, if any, best describe these observations.

引用

页码：L96 / L100

页数：5

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