Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7259t&link_type=abstract
HST Proposal ID #7259
Computer Science
Hst Proposal Id #7259 Agn/Quasars
Scientific paper
The jet in M87 is unusually bright at optical through x-ray wavelengths. Being the closest such optical jet it is a prime target for high resolution imaging with the HST. The jet is highly polarized {20%+} at both radio and optical wavelengths, and a comparison of the ultraviolet {pre-COSTAR FOC} and radio {VLA} polarization maps of the jet revealed a region of strong depolarization immediately adjacent to and downstream from the brightest knot in the jet. This is interpreted as evidence for the interaction of the jet with a dense cloud or filament in the interstellar medium of M87. If correct, then it implies that the jet brightness is primarily determined not by relativistic beaming, but by its interaction with the interstellar medium of the host galaxy. We propose to use NICMOS to map the polarization of the jet at infrared wavelengths - intermediate between the ultraviolet and radio wavelengths used previously. We will compare these new infrared data with VLA radio archive data, new MERLIN radio data, our pre-COSTAR FOC ultraviolet data, and post-COSTAR FOC ultraviolet archive data to produce high resolution spectral index, depolarization and rotation measure maps of the jet. We will use these maps to investigate the origin of the jet emission and, in particular, to look for any evidence of a jet-cloud interaction.
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