Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1504m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #15.04; Bulletin of the American Astronomical Society, Vol. 24, p.1143
Other
1
Scientific paper
We present CCD color imagery of dominant cluster galaxies centered in large cluster cooling flows (cfd's). Earlier photometry through synthetic elliptical apertures has shown that these objects have blue central colors and radial color profiles which redden with radius, opposite to those in normal gE's. Using color maps and difference images formed by modeling and subtracting the background galaxy, we find bright lobes of blue continuum light projected along the radio source structures which are perpendicular to the central dust lanes of the cfd's in A1795 and A2597. It appears that interactions between their radio jets and the ambient medium may have induced star formation, or that the blue lobes are scattered radiation from an anisotropically emitting active nucleus. These objects, which reside at z < 0.1, may be the scaled-down analogs of aligned high redshift radio galaxies. Difference images of NGC 1275 show extinction attributable to dust in a flattened distribution that is aligned with its atomic and molecular gas. This morphology suggests that most of the dust is associated with NGC 1275 itself, rather than the high velocity system (HVS). The central dust structure within 7 kpc (H_o=50 km/s/Mpc) of the active nucleus, appears to be cospatial with the young blue star clusters recently detected with the HST. The bright, 20cm radio continuum structure is oriented roughly perpendicular to the central dust feature, similar to A1795, A2597 and other prominent radio galaxies. The blue clusters associated with NGC 1275 at larger radii are distributed along the cold gas axis to the north-east; whereas, those associated with the HVS are roughly perpendicular to this axis along the north-west radio lobe. Contrary to earlier studies, we find significant blue continuum from the HVS. The central region within a 15 kpc radius appears to be embedded in a diffuse halo of blue light, similar to that found in A1795 and perhaps in A2597. While NGC 1275 may have many unusual properties, its basic structure may be that of a relatively normal elliptical radio galaxy.
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