On the galaxy surrounding the BL Lac object H2356 - 309

Details On the galaxy surrounding the BL Lac object H2356 - 309 On the galaxy surrounding the BL Lac object H2356 - 309

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..821f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 821-824.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Bl Lacertae Objects, Elliptical Galaxies, Infrared Photometry, Absorption Spectra, Red Shift, X Ray Sources

Scientific paper

Imaging, optical spectrophotometry, and simultaneous NIR photometry of the X-ray selected BL Lac object H2356 - 309 are presented. The surrounding nebulosity is found well represented by a de Vaucouleurs r-exp 1/4 law with a small disk contribution suggested by pointed isophotes. The detection of stellar absorption features Ca II, G band, and Mg I makes it possible to derive the redshift z = 0.165 for the underlying galaxy whose absolute magnitude is M(V) = -22.3. Decomposition of the observed spectral flux distribution into a standard elliptical galaxy plus a power law is obtained with alpha(nu) = 0.75 and a galaxy contribution of 40 percent at 5500 A.

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