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Title:
The detection of X-ray emission from the BL Lacertae object Markarian 180
Authors:
Mufson, S. L.; Hutter, D. J.
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 1, 1981, p. L61-L64. (ApJL Homepage)
Publication Date:
09/1981
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Bl Lacertae Objects, Elliptical Galaxies, Galactic Nuclei, Galactic Radiation, X Ray Sources, X Ray Spectra, Astronomical Photometry, Heao 1, Heao 2, Nonthermal Radiation, Ubv Spectra
DOI:
10.1086/183624
Bibliographic Code:
1981ApJ...248L..61M

Abstract

The detection of X-ray emission from Mrk 180, an elliptical galaxy which has a BL Lac object embedded in its core is reported. The X-ray observations were made by the Einstein and HEAO 1 satellites. In addition, new multiaperture UBVR photometric observations are presented which were used to separate the nonthermal optical emission from the galactic emission. Analysis of the Einstein data suggests that the continuous X-ray spectrum of Mrk 180 is a power law with an energy spectral index of -1.3. The deconvolution of the optical magnitudes is consistent with a nonthermal source having a spectral index of -1.2. The continuous spectrum of Mrk 180 is steep from the X-ray to the optical and flattens out in the radio.

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