Very recent IUE observations of 2 BL lacertae objects

Details Very recent IUE observations of 2 BL lacertae objects Very recent IUE observations of 2 BL lacertae objects

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..139u&link_type=abstract

In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 139-142 (SEE N85-20961 11-89)

Astronomy and Astrophysics

Astronomy

Bl Lacertae Objects, Ultraviolet Spectra, X Ray Sources, Iue, Ultraviolet Astronomy

Scientific paper

IUE observations of two BL Lacertae objects, consisting of two spectra of 1218+304 and 12 spectra of Mrk 421, are presented. The former object has never been observed with IUE, possibly because it is very faint, but the fact that it is an X-ray source, and a highly variable one, makes it particularly interesting. Mrk 421 has been observed many times with IUE as part of a continuing monitoring program. The present observations indicate an intensity decrease of approximately 25% on a timescale of one month, with little if any associated spectral change. With one exception, the spectra of these two objects show no discrete features, and the continua are well fit by power law models. The one exception is a long SWP exposure of Mrk 421, from March 9, 1984, which shows a broad emission feature near approximately 1580 A. The validity of this feature has not yet been established.

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