2004A&A...414..117H


Query : 2004A&A...414..117H

2004A&A...414..117H - Astronomy and Astrophysics, volume 414, 117-122 (2004/1-4)

Water vapor in the starburst galaxy NGC 253: A new nuclear maser?

HENKEL C., TARCHI A., MENTEN K.M. and PECK A.B.

Abstract (from CDS):

22GHz water vapor emission was observed toward the central region of the spiral starburst galaxy NGC 253. Monitoring observations with the 100-m telescope at Effelsberg and measurements with the BnC array of the VLA reveal three distinct velocity components, all of them blueshifted with respect to the systemic velocity. The main component arises from a region close to the dynamical center and is displaced by <1" from the putative nuclear continuum source. The bulk of the maser emission is spread over an area not larger than 70x50mas2. Its radial velocity may be explained by masing gas that is part of a nuclear accretion disk or of a counterrotating kinematical subsystem or by gas that is entrained by the nuclear superwind or by an expanding supernova shell. A weaker feature, located ∼5" to the northeast, is likely related to an optically obscured site of massive star formation. Another maser component, situated within the innermost few 10" of the galaxy, is also identified.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: NGC 253 - galaxies: ISM - galaxies: starburst - radio lines: galaxies

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1111 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3302 2
3 [LT2006b] 5.773-39.54 SNR 00 47 33.15 -25 17 17.5           ~ 13 0
4 [AU88] 5.79-39.7 SNR 00 47 33.175 -25 17 17.64           ~ 7 0
5 [LT2006b] 5.795-39.05 SNR 00 47 33.178 -25 17 16.93           ~ 39 0
6 NGC 262 Sy2 00 48 47.14147900 +31 57 25.0845702 14.04 13.90 13.06 8.53   ~ 732 3
7 QSO B0118-272 BLL 01 20 31.6628068344 -27 01 24.636341064   15.89 15.56 15.49   ~ 270 1
8 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5811 1
9 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2798 2
10 NGC 1052 Sy2 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1294 2
11 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1505 1
12 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 714 2
13 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5814 6
14 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4304 4
15 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 429 0

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