The Nuclear Region of Blazar-like Objects: Stellar Population Content and Emission-line Spectra (Poster)

Details The Nuclear Region of Blazar-like Objects: Stellar Population Content and Emission-line Spectra (Poster) The Nuclear Region of Blazar-like Objects: Stellar Population Content and Emission-line Spectra (Poster)

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aspc..299..289g&link_type=abstract

High Energy Blazar Astronomy, ASP Conference Proceedings, Vol. 299, held 17-21 June 2002 at Tuorla Observatory, Piikkio, Finland

Astronomy and Astrophysics

Astronomy

Scientific paper

We have examined the spectroscopic properties of a sample of 19 optically bright, low luminosity core-dominated radio sources; this sample was expected to contain a high fraction of objects observed at small angles to the line-of-sight (blazar-like objects). Our study focus on the properties -- stellar populations and optical emission-line spectra -- of such low luminosity nuclei. Stellar population synthesis shows that the nuclear populations are composed, in a general way, of old stars of solar metallicity or lower; the dust content is weak. After substraction of the stellar contribution, we are left with a set of nuclear emission-line spectra; their analysis shows that most of the objects harbour a Low Ionization Nuclear Emission Region (or LINER), whose contribution was highly diluted by the host galaxy starlight. Such a low ionization spectrum is in agreement with the black hole mass values and sub-Eddington accretion rates published for some BL Lacs; also, the stellar populations derived in this study are in agreement with those usually found in LINERs.

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