Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..733k&link_type=abstract
Nature (ISSN 0028-0836), vol. 311, Oct. 25, 1984, p. 733, 734. Research supported by the Department of Space and Space Commissio
Astronomy and Astrophysics
Astronomy
13
Astronomical Photometry, Bl Lacertae Objects, Optical Polarization, Polarimetry, Astronomical Models, Compton Effect, Linear Polarization, Synchrotron Radiation
Scientific paper
An analysis of photopolarimetric data on the celestial object OJ287 is presented. The data were taken in the UV, blue, visible, red, and IR wavebands in January 1984. Polarizations in the various bands were monitored from 15-25 min each. Three asymmetric sawtooth variations appeared during I-band scans, and a wavelength dependence of the extent and orientation of the polarization indicated that the variations were present at all bands. The 4 percent magnitude of the variations ruled out instrumental contributions. The possible sources of the variations, synchrotron radiation and inverse Compton scattering, are discussed, noting that the latter would indicate a massive black hole at the center of the quasar-like OJ287.
Deshpande M. R.
Joshi Umesh C.
Kulshrestha A. K.
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