Polarization and Spectral Variability in M87 Nucleus and HST 1

Details Polarization and Spectral Variability in M87 Nucleus and HST 1 Polarization and Spectral Variability in M87 Nucleus and HST 1

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jsara...5...12a&link_type=abstract

Journal of the Southeastern Association for Research in Astronomy, vol. 5, p. 12-18

Astronomy and Astrophysics

Astronomy

Galaxies: Individual:M87, Galaxies: Active, Galaxies: Jets, Nuclei

Scientific paper

The first knot in the jet of the giant elliptical galaxy M87, known as HST-1, has been the subject of intense study over the last decade, as a result of a massive flare that peaked in 2005. During that flare, its flux increased more than a hundredfold in the UV and X-rays, with large increases seen in every band. The goal of this paper is to study the variability of the polarization in both the nucleus and HST-1. The results that were obtained from the HST-1 data, show a strong correlation between the variability in flux and fractional polarization during the time range associated with the flare. However, the core shows no such correlation, thus leading one to speculate that such changes in the core are due to some other mechanism. Also, the results show large fluctuations in the Magnetic Field Position Angle (MFPA) of the core, with very little change in the MFPA of HST-1. We also combined all polarimetry data to make new vector maps that provide new, higher resolution information on the polarization of the entire jet than in previous papers.

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