Color Imagery of the Centrally Dominant Galaxy in the z=0.29 Cluster Zwicky 3146

Details Color Imagery of the Centrally Dominant Galaxy in the z=0.29 Cluster Zwicky 3146 Color Imagery of the Centrally Dominant Galaxy in the z=0.29 Cluster Zwicky 3146

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18711007l&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #110.07; Bulletin of the American Astronomical Society, Vol. 27, p.1443

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We have obtained U, R and Hα images of the centrally dominant galaxy in the Zwicky 3146 cluster using the 4 meter telescope of the Kitt Peak National Observatory. Zwicky 3146 is a distant (z=0.29), X-ray luminous cluster (L_x =~ 2x 10(45) erg s(-1) ) that harbors the largest known cooling flow (dot m ~ 1200 Msun yr(-1) ) [Allen et al. 1992, MNRAS 259, 67; Edge, et al. 1994, MNRAS, 270, L1]. The central galaxy has an unusually blue optical spectrum and is the most luminous known in optical line emission (L_{H alpha } =~ 10(43) erg s(-1) ) [Allen et al. 1992]. We find the inner 75 kpc of the central galaxy (H_0=50 km s(-1) Mpc(-1) ; q_0=0) to be roughly 1.2 magnitudes bluer at U-R than the halo. The Hα emission is extended over a similar region of the galaxy. The bluest regions are located in two features oriented north-south straddling the nucleus. It is not clear whether the galaxy is intrinsically bluest in these regions or whether this morphology results from reddening by a 40 kpc dust lane bisecting the galaxy. The blue structure, which probably originates from a significant episode of star formation, is morphologically similar to the lobes of optical continuum found along the radio lobes of the central galaxies in the Abell 1795 and Abell 2597 clusters (McNamara & O'Connell, 1993, AJ, 105, 417). These clusters also harbor massive cooling flows with cooling rates ~ 300 Msun yr(-1) . The Zwicky 3146 central galaxy has not been imaged at radio frequencies, so the relationship between its blue optical structure and radio source is unknown.

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