SIMBAD references

2008AJ....136.1799K - Astron. J., 136, 1799-1809 (2008/November-0)

Infrared imaging of Sloan digital sky survey quasars: implications for the quasar K correction.


Abstract (from CDS):

We have imaged 45 quasars from the Sloan Digital Sky Survey (SDSS) with redshifts 1.85 < z < 4.26 in JHKs with the Kitt Peak National Observatory simultaneous quad infrared imaging device imager. By combining these data with optical magnitudes from the SDSS we have computed the rest-frame optical spectral indices of this sample and investigate their relation with quasar redshift. We find a mean spectral index of <αo≥-0.55±0.42 with a large spread in values. We also find possible evolution of the form αo= (0.148±0.068)z - (0.964±0.200) in the luminosity range -28.0 < Mi< -26.5. Such evolution suggests changes in the accretion process in quasars with time and is shown to have an effect on computed quasar luminosity functions.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: evolution - quasars: general

Simbad objects: 45

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