A Near-Infrared Spectral Template for Quasars

Abstract

We present a near-infrared quasar composite spectrum spanning the wavelength range 0.58 - 3.5 um. The spectrum has been constructed from observations of 27 quasars obtained at the NASA IRTF telescope and satisfying the criteria Ks < 14.5 and Mi < -23; the redshift range is 0.118 < z < 0.418. The signal-to-noise is moderate, reaching a maximum of 150 between 1.6 and 1.9 um. While a power-law fit to the continuum of the composite spectrum requires two breaks, a single power-law slope of alpha=-0.92 plus a 1260 K blackbody provides an excellent description of the spectrum from H-alpha to 3.5 um, strongly suggesting the presence of significant quantities of hot dust in this blue-selected quasar sample. We measure intensities and line widths for ten lines, finding that the Paschen line ratios rule out Case B recombination. We compute K-corrections for the J, H, K, and Spitzer 3.6 um bands which will be useful in analyzing observations of quasars up to z=10.

arXiv comment39 pages, 11 figures, accepted for publication in ApJ Spectra will be made available in the online version of the journal, once published. Until then, if you wish to obtain the composite spectrum send an email request to eilatg[at]astro.columbia.edu

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