2002A&A...383...65H

Query : 2002A&A...383...65H

2002A&A...383...65H - Astronomy and Astrophysics, volume 383, 65-70 (2002/2-3)

A search for extragalactic H2O maser emission towards IRAS galaxies. Detection of a maser from an infrared-luminous merger, NGC 6240.

HAGIWARA Y., DIAMOND P.J. and MIYOSHI M.

Abstract (from CDS):

We report the result of an on-going survey for 22GHz H2O maser emission towards infrared luminous galaxies. The observed galaxies were selected primarily from the IRAS bright galaxy sample. The survey has resulted in the detection of one new maser. The new maser was discovered towards the [U]LIRG/merger galaxy NGC 6240, which contains a LINER nucleus. This is the first detection of an H2O maser towards this class of galaxy, they are traditionally associated with OH megamaser sources. The detected maser emission is highly redshifted (∼260-300km/s) with respect to the adopted systemic velocity of the galaxy, and we identified no other significant emission at velocities ≲±500km/s relative to the systemic velocity. The presence of high-velocity maser emission implies the possible existence of a rotating maser disk formed in the merging process. The large maser luminosity (∼40L☉) suggests that an active galactic nucleus could be the energy source that gives rise to the water emission. Alternatively, the maser emission could be associated with the previously observed double radio source in the centre of the galaxy. Interferometric observations with high angular resolution will be able to clarify the origin of the new maser.

Abstract Copyright: ∼

Journal keyword(s): masers - galaxies: active - galaxies: individual (NGC 6240): radio lines - ISM: molecules

Simbad objects: 25

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Number of rows : 25
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 UGC 12914 LIN 00 01 38.3220061296 +23 29 01.190922432   13.2       ~ 150 1
2 NGC 262 Sy2 00 48 47.14147900 +31 57 25.0845702 14.04 13.90 13.06 8.53   ~ 735 3
3 NGC 1052 Sy2 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1299 2
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4601 2
5 UGC 5101 Sy2 09 35 51.6045544584 +61 21 11.589382368   15.20 15.50     ~ 572 4
6 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 773 1
7 UGC 6472 C G 11 28 30.70 +58 33 48.4           ~ 351 0
8 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 978 4
9 NAME NGC 3690 West GiP 11 28 31.02 +58 33 40.7   11.8       ~ 629 4
10 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 631 4
11 NGC 3822 Sy1 11 42 11.0963209488 +10 16 39.965991204   13.7   12.97   ~ 131 0
12 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2364 3
13 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1340 2
14 NGC 4438 LIN 12 27 45.6705493536 +13 00 31.708096380 11.37 11.02 10.17     ~ 636 2
15 NGC 4490 GiP 12 30 34.5 +41 38 26 10.03 10.22 9.79     ~ 574 3
16 NGC 4532 GiP 12 34 19.329 +06 28 03.73   12.3       ~ 286 2
17 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1095 2
18 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
19 NGC 5793 Sy2 14 59 24.807 -16 41 36.55   14.47 13.32 12.77   ~ 137 1
20 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2961 4
21 NGC 6052 AG? 16 05 12.8715178104 +20 32 32.607297132 13.01 13.44 13.00     ~ 351 2
22 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 430 2
23 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1637 2
24 NGC 6285 GiG 16 58 24.016 +58 57 21.23   15.3       ~ 109 0
25 NGC 7674 Sy2 23 27 56.6973043968 +08 46 44.253707772 13.84 13.92 13.23 12.64   ~ 700 4

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