HST Imaging Polarimetry of the Gravitational Lens FSC10214+4724

Details HST Imaging Polarimetry of the Gravitational Lens FSC10214+4724 HST Imaging Polarimetry of the Gravitational Lens FSC10214+4724

1998-10-22

arxiv.org/abs/astro-ph/9810370v1

Astronomy and Astrophysics

Astrophysics

17 pages, 3 figures. Accepted for publication in Astronomical Journal, February 1999

Scientific paper

10.1086/300742

We present imaging polarimetry of the extremely luminous, redshift 2.3 IRAS source FSC10214+4724. The observations were obtained with HST's Faint Object Camera in the F437M filter, which is free of strong emission lines. The 0.7 arcsec long arc is unresolved to 0.04 arcsec FWHM in the transverse direction, and has an integrated polarization of 28 +/- 3 percent, in good agreement with ground-based observations. The polarization position angle varies along the arc by up to 35 deg. The overall position angle is 62 +/- 3 deg east of north. No counterimage is detected to B = 27.5 mag ($3\sigma$), giving an observed arc to counterimage flux ratio greater than 250, considerably greater than the flux ratio of 100 measured previously in the I-band. This implies that the configuration of the object in the source plane at the B-band is different from that at I-band, and/or that the lensing galaxy is dusty.

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