Three quasars from a survey of strong 25-μm emitters

Details Three quasars from a survey of strong 25-μm emitters Three quasars from a survey of strong 25-μm emitters

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.311..541w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 311, Issue 3, pp. 541-554.

Astronomy and Astrophysics

Astronomy

Galaxies: Fundamental Parameters, Quasars: Emission Lines, Quasars: Individual: Z05558-5008, Quasars: Individual: Z06367-6845, Quasars: Individual: F21382-2659, Infrared: Galaxies

Scientific paper

We have carried out a spectroscopic survey of 750 sources that are strong 25-μm emitters from the IRAS Faint Source data base. Many of these sources are previously unknown active galactic nuclei including new IRAS quasars, three of which we describe here: F21382-2659, Z06367-6845 and Z05558-5008. They are all radio and X-ray quiet, and compared to the known IRAS quasars they have similar 25-μm luminosities, L(25μm), but lower values of L(25μm)/L(B). Their F(25μm)/F(60μm) IRAS colours lie in the range 0.33 to 1.08, indicating the presence of relatively warm dust, presumably in a dusty torus surrounding the central source, and with temperatures similar to those of the known IRAS quasars. The quasar with the warmest dust, F21382-2659, exhibits broad (full width at half-maximum ~4000kms-1) asymmetric Balmer lines with Hγ having an opposite asymmetry to the other broad lines; also Hβ (only) is double-peaked. Feii is very weak in F21382-2659 but strong in the other two quasars, and the anticorrelation between Feii and [Oiii] holds as anticipated. Two of the quasars are unpolarized: although F21382-2659 is optically polarized (2.1per cent at 4950Å), we argue that this provides little insight into the orientation of its dust torus relative to the line of sight.

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