Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400l..13c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 400, no. 1, p. L13-L15.
Astronomy and Astrophysics
Astronomy
54
Absorption Spectra, Bl Lacertae Objects, H Lines, Radio Sources (Astronomy), Red Shift, Spiral Galaxies, Astronomical Spectroscopy, Gravitational Lenses, Very Large Array (Vla)
Scientific paper
A strong H I 21-cm absorption line is identified toward PKS 1413+135 at the redshift of the host galaxy and argued to indicate that the IR-optical cutoff of the BL Lac object's spectrum is caused by extinction. The BL Lac object is shown to have strong neutral 21-cm absorption at the redshift range z = 0.24671 +/- 0.00001, and the implied H I column density is derived. The H I covering factor is assumed to be not more than 0.1, suggesting that a high degree of extinction exists in the galaxy. The host galaxy is theorized to be a spiral of type later than S0 based on the redshift of the H I absorption line and the host. The statistical and observational conclusions are found to support the theories of Stock et al. (1992) regarding the red spectrum of the object.
Carilli Chris L.
Perlman Eric Steven
Stocke John T.
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