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For refcode 1996ApJ...456L..21P:
Retrieve 3 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1996ApJ...456L..21P THE SERENDIPITOUS DISCOVERY OF A GROUP OR CLUSTER OF YOUNG GALAXIES AT z ~ 2.40 IN DEEP HUBBLE SPACE TELESCOPE WFPC2 IMAGES S. M. PASCARELLE, R. A. WINDHORST, S. P. DRIVER, AND E. J. OSTRANDER Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85:187-1504; smp@deltat.la.asu.edu; raw,spd,ejo@cosmos.la.asu.edu AND W. C. KEEL Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487-0324; keel@bildad.astr.ua.edu Received 1995 July 6; accepted 1995 October 20 ABSTRACT We report the serendipitous discovery of a group or cluster of young galaxies at z ~ 2.40 in a 24 orbit Hubble Space Telescope/WFPC2 exposure of the field around the weak radio galaxy 53W002. Potential cluster members were identified on ground-based narrowband redshifted Ly{alpha} images and confirmed via spectroscopy. In addition to the known weak radio galaxy 53W002 at z = 2.390, two other objects were found to have excess narrowband Ly{alpha} emission at z ~ 2.40. Both have been spectroscopically confirmed, and one clearly contains a weak active galactic nucleus (AGN). They are located within 1' of 53W002 or ~0.23 h_100_^-1^1~ Mpc (q_0_ = 0.5) at z ~ 2.40, which is the physical scale of a group or small cluster of galaxies. Profile fitting of the WFPC2 images shows that the objects are very compact, with scale lengths ~0.1 (~0.39 h_100_^-1^ kpc), and are rather faint (luminosities < L^*^), implying that they may be subgalactic-sized objects. We discuss these results in the context of galaxy and cluster evolution and the role that weak AGNs may play in the formation of young galaxies. Subject headings: galaxies: clusters: general - galaxies: distances and redshifts - galaxies: evolution - galaxies: formation - quasars: general
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