2010ApJ...710L.111S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST14:06:13

2010ApJ...710L.111S - Astrophys. J., 710, L111-L114 (2010/February-3)

Expanded very large array detection of 36.2 GHz class I methanol masers in Sagittarius A.

SJOUWERMAN L.O., PIHLSTROM Y.M. and FISH V.L.

Abstract (from CDS):

We report on the interferometric detection of 36.2 GHz Class I methanol emission with the new 27-40 GHz Ka-band receivers available on the Expanded Very Large Array (EVLA). The brightness temperatures of the interferometric 36 GHz detections unambiguously indicate for the first time that the emission is maser emission. The 36 GHz methanol masers are not co-spatial with 1720 MHz OH masers, indicating that the two species trace different shocks. The 36 GHz and 44 GHz methanol masers, which are collisionally pumped, do not necessarily co-exist and may trace different methanol gas. The methanol masers seem correlated with NH3(3,3) density peaks. We favor an explanation in which the 36 GHz Class I methanol masers outline regions of cloud-cloud collisions, perhaps just before the onset of the formation of individual massive stars. The transition of the Very Large Array (VLA) to the EVLA is well under way, and these detections demonstrate the bright future of this completely renewed instrument.

Abstract Copyright:

Journal keyword(s): Galaxy: center - ISM: clouds - ISM: individual objects: Sgr - ISM: supernova remnants - masers - radio lines: ISM

CDS comments: Paragr. 4.2: SNR G359.02-0.09 is probably a misprint for SNR G359.0-00.9.

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1051 2
2 OMC 2 MoC 05 35 27 -05 10.1           ~ 404 1
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3856 2
4 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 1010 1
5 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 923 0
6 GCM -0.13 -0.08 MoC 17 45 25.2 -29 05 30           ~ 111 1
7 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12103 0
8 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 121 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3627 3
10 NAME Sgr A East Rad 17 45 41 -29 00.8           ~ 454 2
11 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 149 0
12 SNR G359.0-00.9 Rad 17 46 50 -30 16.0           ~ 50 1
13 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1993 1

    Equat.    Gal    SGal    Ecl

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2021.04.14-14:06:13

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