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Article overview
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Low Luminosity AGN candidates in SDSS | | J.P. Torres-Papaqui
; R. Coziol
; J.M. Islas-Islas
; R.A. Ortega-Minakata
; D.M. Neri-Larios
; | | Date: |
20 Nov 2010 | | 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]$lambda$5007, H$eta$, or both,
are missing. The nature of the activity in these galaxies was determined using
a diagnostic diagram comparing the equivalent width of [NII]$lambda$6584 with
the ratio [NII]$lambda$6584/H$alpha$. The majority of these galaxies are AGN.
The H$alpha$ emission lines have a mean FWHM of 400 km s$^{-1}$ and mean
luminosity of 5.6$ imes$10$^{39}$ 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$le 2$, with bulges more massive than
those of the luminous AGNs. | | Source: | arXiv, 1011.4593 | | Services: | Forum | Review | PDF | Favorites | |
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