Low Luminosity AGN candidates in SDSS

2010/11/20 by J. P. Torres-Papaqui, R. Coziol, Torres-Papaqui, J. P. +7
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.48550/arxiv.1011.4593

8 pages, 2 figures, to appear in XIII Latin American Regional IAU Meeting

arxiv created 2010/11/20 · arxiv updated 2010/11/23

Abstract

In a sample of 476931 NELGs obtained from the SDSS DR5 data we find that in 22% of the galaxies the emission line [OIII]λ5007, Hβ, or both, are missing. The nature of the activity in these galaxies was determined using a diagnostic diagram comparing the equivalent width of [NII]λ6584 with the ratio [NII]λ6584/Hα. The majority of these galaxies are AGN. The Hα emission lines have a mean FWHM of 400 km s^-1 and mean luminosity of 5.6×10³⁹ erg s^-1, which justify their classification as LLAGN. A study of their star formation histories using STARLIGHT reveals no trace of star formation over the last Gyr period. The hosts of the LLAGNs are early-type, T≤ 2, with bulges more massive than those of the luminous AGNs.

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