The ultraviolet-to-near-infrared spectral flux distribution of four BL Lacertae

Details The ultraviolet-to-near-infrared spectral flux distribution of four BL Lacertae The ultraviolet-to-near-infrared spectral flux distribution of four BL Lacertae

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..532f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 532-536.

Astronomy and Astrophysics

Astronomy

23

Astronomical Spectroscopy, Bl Lacertae Objects, Infrared Spectroscopy, Ultraviolet Spectroscopy, Iue, Radio Sources (Astronomy), X Ray Sources

Scientific paper

We report on simultaneous UV, optical, and near-IR observations of four BL Lac objects. For three objects (PKS 0118-27, PKS 0301-24, and PKS 1538 + 14), we find that the spectral flux distribution from 8 x 10 exp 13 to 2.5 x 10 exp 15 Hz is well described by a single power law with spectral index alpha(nu) = 1.2, alpha(nu) = 1.0, and alpha(nu) = 1.3, respectively. For H0323 + 02, after subtraction of the contribution due to the host galaxy, the spectral emission is again consistent with a single, flatter power law, alpha(nu) = 0.78.

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