Optical integral field spectroscopy and ROSAT X-ray imaging of IRAS 09104+4109

Details Optical integral field spectroscopy and ROSAT X-ray imaging of IRAS 09104+4109 Optical integral field spectroscopy and ROSAT X-ray imaging of IRAS 09104+4109

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.283.1003c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 283, Issue 3, pp. 1003-1014.

Astronomy and Astrophysics

Astronomy

13

Galaxies: Active, Galaxies: Clusters: General, Cooling Flows, Galaxies: Individual: Iras 09104+4109, Quasars: General, X-Rays: Galaxies

Scientific paper

We present results from a long observation using the integral field spectrograph ARGUS of the ultraluminous IRAS source IRAS 09104+4109, which is associated with the central galaxy of a rich cluster at a redshift z=0.44. We map the distribution, kinematics and ionization state of its extended emission-line region, and show that both the nucleus and a secondary peak of line emission have ratios consistent with photoionization by a hidden, but luminous, quasar continuum. The kinematics of the ionized gas suggests that the galaxy and its extended emission-line region form a relatively static system at the cluster core. A strongly blueshifted component of emission-line gas around the nucleus reveals a central outflow, due either to a change in the central radio source, or to a massive supernova wind. We also present a ~30-ks ROSAT HRI pointed observation of IRAS 09104+4109. The X-ray image is extended, and a deprojection analysis confirms the presence of a 800-1100 M_solar yr^-1 cooling flow in the L_X=2.9x10^45 erg s^-1 cluster. A central dip is observed in the X-ray image, which may be caused by the outflow seen in the optical data. IRAS 09104+4109 is probably a very highly absorbed quasar, and presents the firmest case for a strong cooling flow occurring around a quasar, and the first to be discovered directly from an X-ray image.

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