Very recent IUE observations of 2 BL Lacertae orbits

Technical Report · Sun Apr 01 04:00:00 EST 1984

OSTI ID:6260377

Urry, C M; Kondo, Y; Hackney, K R.H.

Spectroscopic observations of two BL Lacertae objects consisting of 2 spectra of 1218+304 and 12 spectra of MrK 421 are presented. Data were generated by the International Ultraviolet Explorer (IUE) and HEAO 1. The former BL object was never before 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 was observed many times before 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 or no associated spectral change. With one exception, the spectra of these two BL objects show no discrete features, and the continua are well fit by the power law models. The one exception is a long exposure of MrK 421 which showed a broad emission feature near 1580 A. The validity of this feature is not yet established.

• Research Organization: National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center
• OSTI ID: 6260377
• Report Number(s): N-84-25561
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BL LACERTAE OBJECTS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
EMISSION SPECTRA
RED SHIFT
SPECTRA
SPECTROSCOPY
TIME DEPENDENCE
ULTRAVIOLET SPECTRA
X-RAY SPECTRA