Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..417m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 417-426.
Astronomy and Astrophysics
Astrophysics
64
Charge Coupled Devices, Cooling Flows (Astrophysics), Galactic Clusters, Galactic Structure, Imaging Techniques, Early Stars, Intergalactic Media, Radio Sources (Astronomy), Star Formation
Scientific paper
CCD color imagery for the centrally dominant galaxies in the clusters A1795 and A2597 is presented. Lobelike continuum structures in their central 10-20 kpc, and absorption features which can be plausibly attributed to dust are found. On the basis of U-I color maps, it is shown that the continuum lobes are very blue and occur on or near bright radio-source structures. If the blue lobes are due to young stars, this spatial correlation suggests that an interaction between the radio sources and the ambient gaseous intracluster medium may have induced the star formation. If this is a common phenomenon in cluster cooling flows, it could help explain the scatter in the correlations between color and mass-accretion rate and also explain why blue color anomalies in cluster cooling flows occur preferentially in the inner 5-20 kpc, similar to the size scales of their radio-source structures.
McNamara Brian R.
O'Connell Robert West
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