An infrared study of hot dust in quasars using prism spectrophotometry

Abstract

view Abstract Citations (50) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An Infrared Study of Hot Dust in Quasars Using Prism Spectrophotometry Kobayashi, Yukiyasu ; Sato, Shuji ; Yamashita, Takuya ; Shiba, Hisashi ; Takami, Hideki Abstract Low-resolution near-infrared spectra were obtained for 14 quasars with redshift z < 0.3. The observed continua from 0.95 to 2.5 microns were reproduced remarkably well with a combination of two radiation components, i.e., the power law and the blackbody radiation which are, respectively, dominated at shorter than ~1.2 microns and longer than ~1.5 microns. The longer part of the spectra fit a single-temperature blackbody of 1470+/-90 K which is attributable to the thermal emission from hot dust grains heated by the central power source. The flux ratio of the blackbody of the power-law component ranges by a factor of 6. It was found that an IRAS color selected sample tended to have a larger flux ratio as compared to non-IRAS quasars. Publication: The Astrophysical Journal Pub Date: February 1993 DOI: 10.1086/172261 Bibcode: 1993ApJ...404...94K Keywords: Black Holes (Astronomy); Cosmic Dust; Infrared Astronomy; Quasars; Spectrophotometry; Black Body Radiation; Emission Spectra; Infrared Spectra; Red Shift; Thermal Emission; Astrophysics; GALAXIES: ISM; GALAXIES: NUCLEI; GALAXIES: PHOTOMETRY; INFRARED: GALAXIES; GALAXIES: QUASARS: GENERAL; RADIATION MECHANISMS: THERMAL full text sources ADS | data products SIMBAD (15) NED (14)