CCD photometry of the BL Lacertae objects 1218+304, 1219+28, and 1727+50 - Point sources, associated nebulosity, and broad-band spectra

Details CCD photometry of the BL Lacertae objects 1218+304, 1219+28, and 1727+50 - Point sources, associated nebulosity, and broad-band spectra CCD photometry of the BL Lacertae objects 1218+304, 1219+28, and 1727+50 - Point sources, associated nebulosity, and broad-band spectra

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249....3w&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 3-12.

Astronomy and Astrophysics

Astrophysics

44

Astronomical Photometry, Bl Lacertae Objects, Charge Coupled Devices, Elliptical Galaxies, Spectral Energy Distribution, X Ray Sources, Broadband, Nebulae, Point Sources, Radio Spectra, Spatial Distribution

Scientific paper

Visual and far-red surface photometry has been obtained for the X-ray emitting BL Lacertae objects 1218+304 and 1727+50, and the highly variable object 1219+28. The intensity distribution for 1727+50 can be modeled by means of a central point source and a de Vaucouleurs intensity law for an underlying galaxy. The spectral index of the point source of 1727+50 is found to be 0.97, while the indices for 1218+304 and 1219+28 are 0.91 and 1.7, respectively. Comparison of the results presented with X-ray and radio-frequency observations suggests that all emission from 1727+50 and 1218+304 is due to direct synchrotron emission. If this is the case, the relativistic motion effects and continuous particle injection are also implied by the data.

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