A Search for UV Absorption Lines in the Intracluster Medium of Abell 1030

Details A Search for UV Absorption Lines in the Intracluster Medium of Abell 1030 A Search for UV Absorption Lines in the Intracluster Medium of Abell 1030

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5934o&link_type=abstract

HST Proposal ID #5934

Physics

Hst Proposal Id #5934 Galaxies &Amp, Clusters

Scientific paper

The existence of a cold component of the ICM is suggested bythe recent observations of low-energy x-ray absorption (e.g.,White Etal 1991). However, the physical state of this cold gasis completely unknown. Abell 1030 (z=0.177) contains thebrightest uv source currently known in an Abell cluster -- thequasar B2 1028+313. We propose to seize this uniqueopportunity to use the bright uv continuum of the quasar toprobe the ICM. We will conduct a very sensitive search (withonly modest amounts of observing time) for absorption linesfrom a cold component of the ICM. If the material cannot bedetected, very restrictive limits will be placed on theamounts of any such material in the form of molecular gas,atomic gas, or ionized gas up to temperatures of ~ 5 * 10^5 K,i.e., N_H lae 10^14 cm^-2 in atomic hydrogen or N_H_2 lae10^15 cm^-2 in molecular hydrogen. If strong UV absorptionlines are detected, (1) the physical state of this materialwill be assessed from the species responsible for theabsorption (molecules, atoms, or ions); (2) we will determineits kinematics from the velocity structure of the absorptionlines; and (3) we will use the set of absorptions to determinebetter estimates of the column densities, velocity widths, andabundances of the clouds. The detection of a colder componentof the ICM would have profound implications for ourunderstanding of (1) cooling flows, (2) Lyman-Alpha forestsystems, (3) galaxy formation, and (4) the magnetic field inthe ICM.

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