2003MNRAS.344L..53H

Query : 2003MNRAS.344L..53H

2003MNRAS.344L..53H - Mon. Not. R. Astron. Soc., 344, L53-L57 (2003/October-1)

A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051.

HAGIWARA Y., DIAMOND P.J., MIYOSHI M., ROVILOS E. and BAAN W.

Abstract (from CDS):

Water vapour maser emission in the 616-523transition towards the narrow-line type 1 Seyfert (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic water maser survey. The Doppler-shifted maser components appear to bracket maser components lying near the systemic velocity of the galaxy symmetrically. The tentative result of a Very Large Array (VLA) snapshot observation is that the masers are confined within 0.1 arcsec (5 pc at a distance D 9.7 Mpc) of the radio continuum peak seen at 8.4 GHz. The low luminosity of the maser (∼2 L☉) is not typical for masers that coincide with the radio continuum nucleus and appear associated with active galactic nucleus (AGN) activity. A low-luminosity maser in a type 1 Seyfert nucleus could be explained by a low maser gain resulting from the lower inclination of an obscuring disc around an active nucleus.

Abstract Copyright: 2003 RAS

Journal keyword(s): galaxies: active - galaxies: individual: NGC 4051 - galaxies: Seyfert - radio lines: galaxies

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
2 NGC 2960 SyG 09 40 36.3826266216 +03 34 37.235848260   13.60       ~ 197 1
3 NGC 3227 Sy1 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1807 2
4 NGC 3367 Sy1 10 46 34.9528432440 +13 45 03.081157488 11.89 12.05 11.50     ~ 285 1
5 LB 2136 Bla 11 53 24.46663994 +49 31 08.8301372   17.94 17.66     ~ 529 1
6 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2270 1
7 IRAS 12112+0305 PaG 12 13 45.98880 +02 48 39.9600           ~ 373 0
8 [CGM90] IRAS 12112+0305 NE rG 12 13 46.10735 +02 48 41.4959           ~ 369 0
9 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
10 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 527 2
11 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
12 IC 883 SBG 13 20 35.37960 +34 08 21.8400   14.8       ~ 421 1
13 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
14 NGC 5256 PaG 13 38 17.81 +48 16 41.2   14.1 13.42     ~ 449 1
15 PKS 1345+12 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 652 2
16 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
17 Z 49-57 rG 15 13 13.1083645335 +07 13 32.099256087   15.5       ~ 252 1
18 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2

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