New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups

Details New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups

2010-08-25

arxiv.org/abs/1008.4253v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

19 pages, 11 figures, 5 tables. Accepted by Astronomy & Astrophysics

Scientific paper

Very luminous extragalactic water masers, the megamasers, are associated with active galactic nuclei (AGN) in galaxies characterized by accretion disks, radio jets, and nuclear outflows. Weaker masers, the kilomasers, seem to be mostly related to star formation activity, although the possibility exists that some of these sources may belong to the weak tail of the AGN maser distribution. It is of particular importance to accurately locate the water maser emission to reveal its origin and shed light onto extragalactic star forming activity or to elucidate the highly obscured central regions of galaxies. We performed interferometric observations of three galaxies, NGC3556, Arp299, and NGC4151, where water emission was found. Statistical tools have been used to study the relation between OH and water maser emission in galaxies. The maser in NGC3556 is associated with a compact radio continuum source that is most likely a supernova remnant or radio supernova. In Arp299, the luminous water maser has been decomposed in three main emitting regions associated with the nuclear regions of the two main galaxies of the system, NGC3690 and IC694, and the region of overlap. In NGC4151, only one of the two previously observed maser components has been tentatively detected. This feature, if real, is associated with the galaxy's central region. The only galaxy, so far, where luminous maser emission from two maser species, OH and H2O has been confidently detected is Arp299. Weaker masers from these two species do instead coexist in a number of objects. A larger number of objects searched for both maser species are, however, necessary to better assess these last two results.

Affiliated with

Also associated with

No associations

Rating

New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups 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 New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-525241