Low Luminosity AGN candidates in SDSS - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




Low Luminosity AGN candidates in SDSS - Astrophysics > Astrophysics of Galaxies - Download this document for free, or read online. Document in PDF available to download.

Abstract: In a sample of 476931 NELGs obtained from the SDSS DR5 data we find that in22% of the galaxies the emission line OIII$\lambda$5007, H$\beta$, or both,are missing. The nature of the activity in these galaxies was determined usinga diagnostic diagram comparing the equivalent width of NII$\lambda$6584 withthe ratio NII$\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 meanluminosity of 5.6$\times$10$^{39}$ erg s$^{-1}$, which justify theirclassification as LLAGN. A study of their star formation histories usingSTARLIGHT reveals no trace of star formation over the last Gyr period. Thehosts of the LLAGNs are early-type, T$\le 2$, with bulges more massive thanthose of the luminous AGNs.



Author: J.P. Torres-Papaqui, R. Coziol, J.M. Islas-Islas, R.A. Ortega-Minakata, D.M. Neri-Larios

Source: https://arxiv.org/







Related documents