A ubiquitous absorption feature in the X-ray spectra of BL Lacertae objects

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169805· OSTI ID:5757383

Madejski, G M; Mushotzky, R F; Weaver, K A; Arnaud, K A; Urry, C M ^[1]

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1. NASA, Goddard Space Flight Center, Greenbelt, MD (USA) Space Telescope Science Institute, Baltimore, MD (USA)

The paper presents the broadband (0.5-20-keV) X-ray spectra of five X-ray bright BL Lac objects observed with the Einstein Observatory Solid State Spectrometer (SSS) and Monitor Proportional Counter (MPC) detectors. The combination of moderate energy resolution and broad spectral coverage makes it possible to confirm the presence of an absorption feature at an energy of 650 eV in the BL Lac object PKS 2155-304, originally reported by Canizares and Kruper (1984) based on higher resolution Einstein Objective Grating Spectrometer (OGS) data. 31 refs.

• OSTI ID: 5757383
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 370; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
BL LACERTAE OBJECTS
COSMIC RADIO SOURCES
LYMAN LINES
MEASURING INSTRUMENTS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
SPECTRA
SPECTROSCOPY
X-RAY SPECTRA