Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-11-20
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
8 pages, 2 figures, to appear in XIII Latin American Regional IAU Meeting
Scientific paper
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$5007, H$\beta$, or both, are missing. The nature of the activity in these galaxies was determined using a diagnostic diagram comparing the equivalent width of [NII]$\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$\times$10$^{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.
Coziol Roger
Islas-Islas J. M.
Neri-Larios D. M.
Ortega-Minakata R. A.
Torres-Papaqui Juan Pablo
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