Issue |
A&A
Volume 457, Number 1, October I 2006
|
|
---|---|---|
Page(s) | 109 - 114 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20065650 | |
Published online | 12 September 2006 |
Water masers in the Local Group of galaxies
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: brunthal@mpifr-bonn.mpg.de
2
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands
3
Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, Australia
4
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
5
ASTRON, Postbus 2, 7990 AA Dwingeloo, The Netherlands
6
Department of Astrophysics, Radboud Universiteit Nijmegen, Postbus 9010, 6500 GL Nijmegen, The Netherlands
Received:
22
May
2006
Accepted:
22
June
2006
We compare the number of detected 22 GHz H2O masers in the Local Group
galaxies M 31, M 33, NGC 6822, IC 10, IC 1613, DDO 187, GR8, NGC 185, and
the Magellanic Clouds with the water maser population of the Milky Way.
To accomplish this we searched for water maser emission in the two Local Group
galaxies M 33 and NGC 6822 using the Very Large Array (VLA) and incorporated
results from previous studies. We observed 62 Hii regions in
M 33 and 36 regions with Hα emission in NGC 6822. Detection limits are 0.0015 and 0.0008 for M 33 and NGC 6822, respectively (corresponding
to 47 and 50 mJy in three channels with 0.7 km s-1 width). M 33 hosts three
water masers above our detection limit, while in NGC 6822 no maser source was
detected. We find that the water maser detection rates in the Local Group
galaxies M 31, M 33, NGC 6822, IC 1613, DDO 187, GR8, NGC 185, and the
Magellanic Clouds are consistent with
expectations from the Galactic water masers if one considers the different
star formation rates of the galaxies. However, the galaxy IC 10 exhibits an
overabundance of masers, which may result from a compact
central starburst.
Key words: masers / galaxies: Local Group
© ESO, 2006
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