2007A&A...461.1027G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.14CEST19:47:05

2007A&A...461.1027G - Astronomy and Astrophysics, volume 461, 1027-1035 (2007/1-3)

Associations of H2O and CH3OH masers at milli-arcsec angular resolution in two high-mass YSOs.

GODDI C., MOSCADELLI L., SANNA A., CESARONI R. and MINIER V.

Abstract (from CDS):

While high-angular resolution observations have clarified that water masers originate from shocks associated with protostellar jets, different environments have been proposed in several sources to explain the origin of CH3OH masers. We wish to investigate the nature of the CH3OH maser birthplace in SFRs and the association between the H2O and CH3OH maser emission in the same YSO. We have conducted phase-reference VLBI observations of H2O and CH3OH masers toward two high-mass SFRs, Sh 2-255 IR and AFGL 5142. In Sh 2-255 IR water masers are aligned along a direction close to the orientation of the molecular outflow observed on angular scales of 1-10 arcsec, tracing possibly the disk-wind emerging from the disk atmosphere. In AFGL 5142 water masers trace expansion at the base of a protostellar jet, whilst methanol masers are more probably tracing infalling than outflowing gas. The results for AFGL 5142 suggest that water and methanol masers trace different kinematic structures in the circumstellar gas.

Abstract Copyright:

Journal keyword(s): masers - stars: circumstellar matter - ISM: kinematics and dynamics - ISM: jets and outflows - radio lines: stars

Nomenclature: Table 1: [GMS2007] Sh 2-255 IR NN (Nos 1-57). Table 2: [GMS2007] AFGL 5142 NN (Nos 1-27).

CDS comments: Paragraph 1. G313.77-0.86 is IRAS 14212-6131 in Simbad. Paragraph 2.2. phase-reference source J0518+3306 not identified.

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 QSO B0446+113 BLL 04 49 07.67110088 +11 21 28.5964577     20 18.58   ~ 230 1
2 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 185 2
3 QSO J0530+13 Bla 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 896 1
4 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 477 2
5 ICRF J060309.1+174216 BLL 06 03 09.13027 +17 42 16.8107       19.2   ~ 39 1
6 NAME S255-2 IR 06 12 53.8 +17 59 22           ~ 39 0
7 4C 14.23 BLL 07 25 16.80776128 +14 25 13.7466902       17.48   ~ 116 1
8 IRAS 13471-6120 Y*O 13 50 41.832 -61 35 09.96           ~ 34 0
9 GAL 309.92+00.48 HII 13 50 42.0 -61 35 09           ~ 31 0
10 IRAS 14212-6131 HII 14 25 01.51896 -61 44 57.5916           ~ 17 0
11 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 336 1
12 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 404 0
13 NGC 7538 OpC 23 13 37 +61 30.0           ~ 835 0

    Equat.    Gal    SGal    Ecl

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2021.05.14-19:47:05

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