Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4104h&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #41.04; Bulletin of the American Astronomical Society, Vol. 24, p.1184
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of broad band polarimetry, spectropolarimetry, and new spectroscopy and radio imaging of the narrow-line, IR-Ultraluminous galaxy IRAS 09104+4109 (L=6 times 10(12) L_sun h(-2) ), that indicate this cD galaxy hides a luminous QSO that ionizes the narrow line region and powers the infrared emission --- a possibility first suggested by Kleinmann et al. 1988, ApJ, 328, 161. The observed broad band polarization is very high and strongly wavelength dependent, increasing from 4.2% near 0.8microns to 21% near 0.36 microns. The narrow emission lines are essentially unpolarized. The position angle is wavelength independent within +/- 5(deg) , and is perpendicular to the direction of the extended [OIII] and R-band emission (Kleinmann et al. 1988, Hutchings & Neff, 1988, AJ, 96, 1575). After correcting for dilution by unpolarized narrow line emission and starlight, we find that the remaining spectrum is highly polarized ( ~ 17%) and approximately wavelength-independent. We relate the polarization to the extended [OIII] and R-band emission by a model in which a very luminous UV continuum source is obscured from direct view by dust that probably covers ~ 90% of the source. A hole in the dust allows the continuum radiation to escape and photoionize a ``cone'' of gas with opening half-angle 0 < theta_c < 37(deg) and inclination i ~ 33(deg) . Some of the continuum is scattered, and thus polarized. Our radio observations show that IRAS 09104+4109 is a classical double radio source with jet axis near the plane of the sky, but the core is unusually bright compared with the lobes. The radio axis appears unrelated to the optical polarization position angle (and the extended [OIII] and R-band emission), but is perpendicular to the major axis of the rich, flattened cluster in which the galaxy resides. We discuss these properties, and the possible role of IRAS 09104+4109 as an intermediate-redshift link in the evolution of cluster radio sources.
Hines Dean Carter
Wills Beverley J.
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