Further Clues to the Nature of Composite LINER/HII Galaxies

Details Further Clues to the Nature of Composite LINER/HII Galaxies Further Clues to the Nature of Composite LINER/HII Galaxies

2004-01-28

arxiv.org/abs/astro-ph/0401593v1

Astron.Astrophys. 418 (2004) 429-443

Astronomy and Astrophysics

Astrophysics

16 pages, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20034486

We have analyzed new, archival and published high resolution radio and X-ray observations of a sample of composite LINER/HII galaxies known to exhibit AGN-like properties. Five of the 16 AGN candidates have milliarcsecond-scale detections and are found to display a compact, flat spectrum, high brightness temperature radio core, four of which also exhibit extended radio emission. Five of the eight AGN candidates with available high resolution X-ray observations were found to possess a hard X-ray nuclear source, two of which have no milliarcsecond radio detection. The combined high resolution radio and X-ray data yield a 50% detection rate of low luminosity AGN among the AGN candidates, which translates into a 12% detection rate for the entire composite LINER/HII sample. In the sources where the AGN has been unambiguously detected, the ionizing power of the AGN is not sufficient to generate the observed emission lines, unless the hard X-rays are heavily obscured. We attempt to apply a canonical advection-dominated accretion flow (ADAF) and jet model to the sample sources in order to explain the observed radio and X-ray emission. While ADAFs may be responsible for the observed emission in submillijansky radio cores like NGC 7331, they do not appear consistent with the radio emission observed in the milliarcsecond-scale radio detected cores; the latter sources are more likely to have an energetically important contribution from a radio-emitting jet.

Affiliated with

Also associated with

No associations

Rating

Further Clues to the Nature of Composite LINER/HII Galaxies 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 Further Clues to the Nature of Composite LINER/HII Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Further Clues to the Nature of Composite LINER/HII Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-587842