High Resolution Morphologies and Colors in Distant Radio Galaxies

Details High Resolution Morphologies and Colors in Distant Radio Galaxies High Resolution Morphologies and Colors in Distant Radio Galaxies

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3654s&link_type=abstract

HST Proposal ID #3654

Computer Science

Hst Proposal Id #3654

Scientific paper

We request HST time with the WFC to observe a luminous radio galaxy at z=1 in order to resolve its morphologies on kiloparsec scales. The elongated continuum structures seen for these galaxies commonly align with the axes of their double lobed radio sources, suggesting large scale star formation induced by the passage of the radio jet through the host galaxy. Seen at the best attainable ground based resolution, the rest-frame ultraviolet continuum breaks up into multiple knots and subcomponents; it may be expected that a comparable gain in detail is to be had with 0".1 HST resolution. The spherical aberration of the HST primary makes achieving such resolution a challenge, but the successful experiences of King et al. (1991) with faint galaxy WFC and FOC imaging and image restoration demonstrate its feasibility, even for 22nd magnitude galaxies, if proper observing strategy is followed and adequate signal-to-noise can be achieved. Deconvolved images taken through two bandpasses will be used to study the kiloparsec scale morphologies of the star forming regions, their detailed correlation with centimeter wavelength radio structure, and their colors, indicative of ages and temperatures of the recently formed stellar populations. With this data in hand, we can begin to test in detail the scenarios which have been advanced to explain the activity which appears to trigger the formation of the bulk of the stellar content of the radio galaxy.

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