The evolution of the H2O maser emission in the accretion burst source G358.93-0.03

被引：10

作者：

Bayandina, O. S. ^{[1
]}

Brogan, C. L. ^{[2
]}

Burns, R. A. ^{[3
,4
,5
]}

Garatti, A. Caratti O. ^{[6
,7
]}

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

van den Heever, S. P. ^{[10
]}

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

MacLeod, G. C. ^{[10
]}

Moscadelli, L.

Sobolev, A. M. ^{[12
]}

Sugiyama, K. ^{[4
,13
]}

Val'tts, I. E. ^{[14
]}

Yonekura, Y. ^{[15
]}

机构：

[1] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[2] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA

[3] Joint Inst VLBI ERIC, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

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

[5] Korea Astron & Space Sci Inst, 776 Daedeokdae ro, Daejeon 34055, South Korea

[6] INAF Osserv Astronom Capodimonte, Via Moiariello 16, I-80131 Naples, Italy

[7] Dublin Inst Adv Studies, Sch Cosm Phys, Astron & Astrophys Sect, 31 Fitzwilliam Pl, Dublin 2, Ireland

[8] Northwest Univ, Dept Phys, Space Res Unit, ZA-2520 Potchefstroom, South Africa

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

[10] SARAO, Hartebeesthoek Radio Astron Observ, POB 443, ZA-1741 Krugersdorp, South Africa

[11] Univ Nacl Autonoma Mexico, Inst Radioastron Astrofis, Antig Carr Patzcuaro 8701, Morelia 58089, Michoacan, Mexico

[12] Ural Fed Univ, 51 Lenin Str, Ekaterinburg 620051, Russia

[13] Natl Astron Res Inst Thailand Publ Org, 260 Moo 4,T Donkaew, Chiang Mai 50180, Thailand

[14] RAS, Ctr Astro Space, PN Lebedev Phys Inst, 84-32 Profsoyuznaya st, Moscow 117997, Russia

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

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 664卷

关键词：

stars: massive; stars: evolution; stars: formation; stars: jets; masers; stars: individual: G358; 0.03; METHANOL MASER; WATER MASERS; EXTRAORDINARY OUTBURST; DISCOVERY; LINES; TRANSITIONS; ALMA;

D O I：

10.1051/0004-6361/202244089

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The massive young stellar object (MYSO) G358.93-0.03-MM1 showed an extraordinary near-infrared- to (sub-)millimetre-dark and far-infrared-loud accretion burst, which is closely associated with flares of several class II methanol maser transitions, and, later, a 22 GHz water maser flare. Aims. Water maser flares provide an invaluable insight into ejection events associated with accretion bursts. Although the short timescale of the 22 GHz water maser flare made it impossible to carry out a very long baseline interferometry observation, we could track it with the Karl G. Jansky Very Large Array (VLA). Methods. The evolution of the spatial structure of the 22 GHz water masers and their association with the continuum sources in the region is studied with the VLA during two epochs, pre- and post-H2O maser flare. Results. A drastic change in the distribution of the water masers is revealed: in contrast to the four maser groups detected during epoch I, only two newly formed clusters are detected during epoch II. The 22 GHz water masers associated with the bursting source MM1 changed in morphology and emission velocity extent. Conclusions. Clear evidence of the influence of the accretion burst on the ejection from G358.93-0.03-MM1 is presented. The accretion event has also potentially affected a region with a radius of similar to 2 '' (similar to 13 500 AU at 6.75 kpc), suppressing water masers associated with other point sources in this region.

引用

页数：10

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