J/AJ/163/83 G358.93-0.03 6.67-23.12GHz CH3OH maser parameters (Bayandina+, 2022)
A multitransition methanol maser study of the accretion burst source
G358.93-0.03-MM1.
Bayandina O.S., Brogan C.L., Burns R.A., Chen X., Hunter T.R., Kurtz S.E.,
Macleod G.C., Sobolev A.M., Sugiyama K., Val'tts I.E., Yonekura Y.
<Astron. J., 163, 83-83 (2022)>
=2022AJ....163...83B 2022AJ....163...83B (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region; Spectra, radio
Keywords: Astrophysical masers; Protostars; Star formation; Star-forming regions
Abstract:
We present the most complete to date interferometric study of the
centimeter-wavelength methanol masers detected in G358.93-0.03 at the
burst and post-burst epochs. A unique, near-IR/(sub)millimeter-dark
and far-IR-loud massive young stellar object accretion burst was
recently discovered in G358.93-0.03. The event was accompanied by
flares of an unprecedented number of rare methanol maser transitions.
The first images of three of the newly discovered methanol masers at
6.18, 12.23, and 20.97GHz are presented in this work. The spatial
structure evolution of the methanol masers at 6.67, 12.18, and
23.12GHz is studied at two epochs. The maser emission in all detected
transitions resides in a region of ∼0.2" around the bursting source
and shows a clear velocity gradient in the north-south direction, with
redshifted features to the north and blueshifted features to the
south. A drastic change in the spatial morphology of the masing region
is found: a dense and compact "spiral" cluster detected at epoch I
evolved into a disperse, "round" structure at epoch II. During the
transition from the first epoch to the second, the region traced by
masers expanded. The comparison of our results with the complementary
Very Large Array, very long baseline interferometry, Submillimeter
Array, and Atacama Large Millimeter/submillimeter Array maser data is
conducted. The obtained methanol maser data support the hypothesis of
the presence of spiral arm structures within the accretion disk, which
was suggested in previous studies of the source.
Description:
Two observing sessions of G358.93-0.03 were carried out with the Karl
G. Jansky VLA on 2019 February 25 (epochI) and on 2019 June 4
(epochII) as the Target of Opportunity programs 19A-448 and 19A-476.
Objects:
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RA (2000) DE Designation(s)
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17 43 10.02 -29 51 45.8 G358.93-0.03 = MMB G358.931-00.030
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 74 98 *6.67GHz CH3OH maser parameters
table6.dat 74 77 *12.18GHz CH3OH maser parameters
table7.dat 74 7 *12.23GHz CH3OH maser parameters
table8.dat 74 25 *20.97GHz CH3OH maser parameters
table9.dat 74 93 *23.12GHz CH3OH maser parameters
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Note on table*.dat: The positional shifts of ΔRA=0.010,
ΔDE=0.079 (epoch I) and ΔRA=0.017, ΔDE=0.017 (epoch
II) were introduced to the data to prepare Figures 3 and 10-11, and
13-15 (see section 2).
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See also:
VIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)
J/A+A/563/A68 : CH3OH and H2O Galactic center masers (Chambers+, 2014)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/ApJ/833/18 : Ultra-compact HII regions & methanol masers. I. (Hu+, 2016)
Byte-by-byte Description of file: table[56789].dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Epoch Observation Epoch
4- 5 I2 h RAh Hour of Right Ascension (J2000)
7- 8 I2 min RAm Minute of Right Ascension (J2000)
10- 16 F7.4 s RAs Second of Right Ascension (J2000)
18- 23 F6.4 s e_RAs Uncertainty in RAs
25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Degree of Declination (J2000)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000)
32- 37 F6.3 arcsec DEs Arcsecond of Declination (J2000)
39- 43 F5.3 arcsec e_DEs Uncertainty in DEs
45- 50 F6.2 Jy Int Integrated Flux
52- 55 F4.2 Jy e_Int Uncertainty in Int
57- 62 F6.2 Jy Flux Peak Flux in units of Jy/beam
64- 67 F4.2 Jy e_Flux Uncertainty in Peak
69- 74 F6.2 km/s Vel Velocity
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 13-Apr-2022