Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap.....54..340s&link_type=abstract
Astrophysics, Volume 54, Issue 3, pp.340-354
Astronomy and Astrophysics
Astrophysics
Fhil Emission, Normal Galaxies, Agn
Scientific paper
We have reported the discovery of a population of the normal extragalactic field galaxies with the clear presence of strong FHIL (forbidden high by ionized lines) and HeII 4686 emission. In this paper we present a dozen of them extracted from the SDSS dr7. The high resolution spectra 0.86 Å /px obtained with the 6-m telescope of the Special Astrophysical observatory of Russia are introduced for one of them, SDSS J093801.63 + 135317.0 confirming the presence of strong and wide FHIL and HeII 4686 emission. These objects show typical narrow (FWHM ~ 120 - 250 km s-1) emission lines both of HI and forbidden emission lines of [NII] 6548/84, [SII] 6717/31, [OI] 6300, [OII] 3727, and [OIII] 5007/4959 with underlying stellar absorption lines, coupled with the strong FHIL emission of [FeVII] 5721, 6087, [FeX] 6375, [FeXI] 7892, [FeXIV] 5303, and HeII 4686, sometimes very broad up to 1500 km s-1. Following the direct images, all morphological types are introduced, spherical, elliptical, spiral, barred spiral, etc., without morphological or other peculiarity and any signs of "standard" AGN activity. None of them are X-ray source. The appearance of the FHIL emission in normal galaxies (the objects of SBN/HII/ELG spectral types) might be one of the important sign of the beginning of the AGN activity. The existence of the numerous normal extragalactic objects with FHIL and HeII 4686 emission tell us that the link between the AGNs and the normal galaxies perhaps might be realized with the FHIL flare in normal galaxies. For all of them, the existence of the nonthermal source in normal galaxies should be proposed.
Afanas'ev V. L.
Stepanian J. A.
No associations
LandOfFree
New type of extragalactic objects? 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 type of extragalactic objects?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New type of extragalactic objects? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1079640