Water maser super-flare G25.65+1.04 Virtual Observatory Resource

Authors
  1. Bayandina O.S.
  2. Burns R.A.
  3. Kurtz S.E.
  4. Moscadelli L.
  5. Sobolev A.M.,Stecklum B.
  6. Val'tts I.E.
  7. Published by
    CDS
Abstract

G25.65+1.04 is one of a few known "super-flare" water masers in the Milky Way, but in contrast to the other sources of the sample, it remains the least studied; in fact, even the nature of the source driving the water maser is still unclear. With this project, we aim to clarify the composition and properties of the G25.65+1.04 region by means of examining the parameters of the continuum sources and establishing their association with masers of different types. Our previous VLA observation detected four continuum peaks (VLA 1-4), three of which (VLA 1-3) were closely spaced and presented a linear orientation. However, that VLA B-configuration observation lacked the spatial resolution to resolve the individual sources. A higher resolution (A-configuration) VLA observation of continuum and spectral lines was conducted in 2019 using L, S, C, and Ku-bands. For the first time, the continuum source VLA 1 - associated with the flaring water maser - is resolved into two components - VLA 1A and 1B. VLA 1A and the water maser are found to spatially coincide and are thought to be powered by the same source - a protostar at an early stage of evolution, showing active ejection. We argue that VLA 2 pinpoints an activly ejecting high-mass protostar as it is associated with a 6.7GHz methanol maser and a magnetised jet traced by 22GHz H_2_O maser. Highly polarised OH maser emission is detected in the vicinity of VLA 1-2, with the brightest OH maser found in VLA 2. The magnetic field, identified from the OH maser emission, ranges from ~+0.4mG in VLA 1A to ~-8mG in VLA 2. The G25.65+1.04 region is found to consist of at least two young stellar objects: VLA 1A and VLA 2. Both sources are found to be at an active accretion/ejection stage of evolution.

Keywords
  1. star-forming-regions
  2. astrophysical-masers
  3. radio-astronomy
  4. radio-sources
Bibliographic source Bibcode
2023A&A...673A..60B
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/673/A60
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/673/A60
Document Object Identifer DOI
doi:10.26093/cds/vizier.36730060

Access

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http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/673/A60/table4?
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https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/673/A60/table5?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/673/A60/table5?

History

2023-05-05T07:38:43Z
Resource record created
2023-05-05T07:38:43Z
Created
2024-11-28T20:03:26Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr