Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-28
Astronomy and Astrophysics
Astrophysics
7 pages including 4 figures, accepted for publication in A&A Main Journal
Scientific paper
10.1051/0004-6361:20020199
The detection of 22 GHz water vapor emission from IC342 is reported, raising the detection rate among northern galaxies with 100 micron IRAS point source fluxes > 50 Jy to 16%. The maser, associated with a star forming region 10-15 arcsec west of the nucleus, consists of a single 0.5 km/s wide feature and reaches an isotropic luminosity of 0.01 solar luminosity (D = 1.8 Mpc). If the time variability is intrinsic, the maser size is < 1.5 x 10^(16) cm (< 0.5 mas) which corresponds to a brightness temperature of > 10^(9) K. The linewidth, luminosity, and rapid variability are reminiscent of the 8 km/s super maser in Orion-KL. A velocity shift of 1 km/s within two weeks and subsequent rapid fading is explained in terms of a chance alignment of two dense molecular clouds. Observations at 22 GHz toward Maffei2 are also reported, yielding a 5 sigma upper limit of 25 mJy for a channel spacing of 1.05 km/s.
Henkel Carsten
Menten Karl. M.
Peck Alison Beth
Tarchi Andrea
No associations
LandOfFree
Water maser emission in IC342 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Water maser emission in IC342, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water maser emission in IC342 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-420393