2007A&A...469..121W


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET08:19:43

2007A&A...469..121W - Astronomy and Astrophysics, volume 469, 121-124 (2007/7-1)

Upper limits to the water abundance in starburst galaxies.

WILSON C.D., BOOTH R.S., OLOFSSON A.O.H., OLBERG M., PERSSON C.M., SANDQVIST A., HJALMARSON A., BUAT V., ENCRENAZ P.J., FICH M., FRISK U., GERIN M., RYDBACK G. and WIKLIND T.

Abstract (from CDS):

We have searched for emission from the 557 GHz ortho-water line in the interstellar medium of six nearby starburst galaxies. We used the Odin satellite to observe the 110-101 transition of o-H2O in the galaxies NGC 253, IC 342, M 82, NGC 4258, CenA, and M 51. None of the galaxies in our sample was detected. We derive three sigma upper limits to the H2O abundance relative to H2 ranging from 2x10–9 to 1x10–8. The best of these upper limits are comparable to the measured abundance of H2O in the Galactic star forming region W3. However, if only 10% of the molecular gas is in very dense cores, then the water abundance limits in the cores themselves would be larger by a factor of 10 i.e. 2x10–8 to 1x10–7. These observations suggest that detections of H2O emission in galaxies with the upcoming Herschel Space Observatory are likely to require on-source integration times of an hour or more except in the very brightest extragalactic targets such as M 82 and NGC 253.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - galaxies: general - ISM: molecules - astrochemistry

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2880 2
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 947 3
3 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1369 1
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5255 6
5 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2077 3
6 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3928 3
7 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3711 4

    Equat.    Gal    SGal    Ecl

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2020.01.27-08:19:43

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