Properties of radio-loud quasars in Sloan Digital Sky Survey

Abstract

We present a study of a sample of 223 radio-loud quasars (up to redshift $<$0.3) in order to investigate their spectral properties. Twenty-six of these radio-loud quasars are identified as Flat Spectrum Radio Quasars (FSRQs) and fifty-four are identified as Steep Spectrum Radio Quasars (SSRQs) based on their radio spectral index. We study the [O III] line properties of these quasars to investigate the origin and properties of blue wings (shift of the profile towards lower wavelengths) and blue outliers (shift of the whole spectroscopic feature). Most of the quasars show blue wings with velocities up to 420 km $s^{-1}$. We find that around 17\% of the quasars show outliers with velocities spanning 419 to -315 km $s^{-1}$. Finally, we revisit the $M_{\mathrm{BH}}-\sigma$ relation of our sample using [S II]$\lambda$6716, 6731 and [O III] linewidths as surrogates for stellar velocity dispersions, $\sigma$, to investigate their location on the $M_{\mathrm{BH}}-\sigma$ relation for quiescent galaxies. Due to the strong blending of [S II] with ${\mathrm{H}}_{\alpha }$, we could estimate ${\sigma }_{[\mathrm{SII}]}$ of only 123 quasars. We find that the radio-loud quasars do not show a relationship between $M_{\mathrm{BH}}$ and ${\sigma }_{[\mathrm{SII}]/[\mathrm{OIII}]}$ up to a redshift of 0.3, although they cluster around the local relation. We find an overall offset of 0.12$\pm$0.05 dex of our sample of radio-loud quasars from the $M_{\mathrm{BH}}-\sigma$ relation of quiescent galaxies. Quasars in our highest redshift bin (z=0.25-0.3) show a deviation of $\sim$0.33 $\pm$ 0.06 dex with respect to the local relation.

11 pages, 11 Figures, accepted for publication in A&A

References in corpus (20)

• A Catalog of Quasar Properties from SDSS DR7
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Heating Hot Atmospheres with Active Galactic Nuclei
• The diversity of quasars unified by accretion and orientation
• A Comprehensive Study of 2 000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey: I. The Sample
• Evidence for powerful AGN winds at high redshift: Dynamics of galactic outflows in radio galaxies during the "Quasar Era"
• On the nature of Seyfert galaxies with high [OIII]5007 blueshifts
• The faint radio sky: radio astronomy becomes mainstream
• Cosmic Evolution of Black Holes and Spheroids. I: The M_BH-sigma Relation at z=0.36
• Radio Loud and Radio Quiet Quasars
• New Indicators for AGN Power: The Correlation Between [O IV] lambda 25.89 micron and Hard X-ray Luminosity for Nearby Seyfert Galaxies
• The Black Hole Mass-Bulge Luminosity Relationship for Active Galactic Nuclei from Reverberation Mapping and Hubble Space Telescope Imaging
• The Sloan Digital Sky Survey Reverberation Mapping Project: No Evidence for Evolution in the M-sigma Relation to z~1
• Narrow-line Seyfert 1 Galaxies and the M_BH - sigma Relation
• The Tully-Fisher relation for S0 galaxies
• The Black Hole-Bulge Relationship in Luminous Broad-Line Active Galactic Nuclei and Host Galaxies
• A Census of Gas Outflows in Type 2 Active Galactic Nuclei
• On the BL Lacertae objects/radio quasars and the FRI/II dichotomy
• The radio luminosity, black hole mass and Eddington ratio for quasars from the Sloan Digital Sky Survey
• Quasar Host Galaxies and the $M_{SMBH}$ - ${\sigma }_{\ast }$ Relation

Cited by in corpus (5)

• Giant radio quasars: sample and basic properties
• Chemical abundances along the quasar main sequence
• A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies
• Selection of highly-accreting quasars: Spectral properties of FeII emitters not belonging to extreme Population A
• A Spatially Resolved Evolutionary Sequence of Multi-wavelength AGN Host Galaxies