J/A+A/664/A44 G358.93-0.03 22GHz H2O maser parameters (Bayandina+, 2022)
The evolution of the H2O maser emission in the accretion burst
source G358.93-0.03.
Bayandina O.S., Brogan C.L., Burns R.A., Caratti o Garatti A.,
Chibueze J.O., van den Heever S.P., Kurtz S.E., MacLeod G.C.,
Moscadelli L., Sobolev A.M., Sugiyama K., Val'tts I.E., Yonekura Y.
<Astron. Astrophys. 664, A44 (2022)>
=2022A&A...664A..44B 2022A&A...664A..44B (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; Masers ; Radio sources
Keywords: stars: formation - stars: evolution - stars: formation - stars: jets -
masers - stars: individual: G358.93-0.03
Abstract:
The massive young stellar object (MYSO) G358.93-0.03-MM1 showed an
extraordinary NIR/(sub)mm-dark and FIR-loud accretion burst closely
associated with flares of several class II methanol maser transitions
and, later, a 22GHz water maser flare. Water maser flares provide an
invaluable insight into ejection events associated with accretion
bursts. Although, the short timescale of the 22GHz water maser flare
made it impossible to carry on a VLBI observation, we could track it
with the Karl G. Jansky Very Large Array (VLA). The evolution of the
spatial structure of the 22GHz water masers and their association
with the continuum sources in the region is studied with the VLA at
two epochs, pre- and post-H2O maser flare. A drastic change in the
distribution of the water masers is revealed: in contrast to four
maser groups detected at epoch I, only two newly formed clusters are
detected at epoch II. The 22GHz water masers associated with the
bursting source MM1 changed in morphology and emission velocity
extent. Clear evidence of the influence of the accretion burst on the
ejection from G358.93-0.03-MM1 is presented. Potentially, the
accretion event has also affected a region with a radius of ∼2''
(∼13500AU at 6.75kpc), suppressing water masers associated with
other point sources in the region.
Description:
Position, velocity, integrated and peak flux density of each of the
detected 22GHz water maser spots are listed. Note that we use the
term "maser spots" to refer to maser emissions detected in a single
velocity channel of a data cube.
Objects:
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RA (2000) DE Designation(s)
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17 43 10.10 -29 51 45.7 G358.93-0.03-MM1 = [BHT2019] G358.93-00.03 MM1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 71 160 22 GHz H2O maser parameters
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See also:
J/AJ/163/83 : G358.93-0.03 6.67-23.12GHz CH3OH maser parameters
(Bayandina+, 2022)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Component H2O maser component
8- 9 I2 h RAh Right Ascension (J2000)
11- 12 I2 min RAm Right Ascension (J2000)
14- 20 F7.4 s RAs Right Ascension (J2000)
22- 28 F7.5 s e_RAs Uncertainty in RA
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 42 F6.3 arcsec DEs Declination (J2000)
44- 48 F5.3 arcsec e_DEs Uncertainty in DE
50- 52 I3 mJy FInt Integrated flux at 22GHz
54- 55 I2 mJy e_FInt Uncertainty in Int
57- 59 I3 mJy/beam Fpeak Peak flux at 22GHz
61- 64 F4.1 mJy/beam e_Fpeak Uncertainty in Fpeak
66- 71 F6.2 km/s Vel Velocity
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Acknowledgements:
Olga Bayandina, olga.bayandina(at)inaf.it
(End) Olga Bayandina [INAF, Italy], Patricia Vannier [CDS] 22-Jun-2022