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Date and Time of the Query: 2019-08-17 T10:33:51 PDT
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For refcode 1999ApJ...522L...9H:
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1999ApJ...522L...9H An Extremely Luminous Galaxy at z = 5.74 ESTHER M. HU, RICHARD G. MCMAHON, AND LENNOX L. COWIE Received 1999 March 30; accepted 1999 July 6; published 1999 August 3 ABSTRACT We report the discovery of an extremely luminous galaxy lying at a redshift of z = 5.74, SSA22-HCM1. The object was found in narrowband imaging of the SSA22 field using a 105 A bandpass filter centered at 8185 A during the course of the Hawaii narrowband survey using the Low-Resolution Imaging Spectrograph (LRIS) on the 10 m Keck II telescope, and it was identified by the equivalent width of the emission [W_{lambda}_(observed) = 175 A, flux = 1.7x10^-17^ ergs cm^-2^ s^-1^]. Comparison with broadband colors shows the presence of an extremely strong break (>4.2 at the 2 {sigma} level) between the Z band above the line, where the AB magnitude is 25.5, and the R band below, where the object is no longer visible at a 2 {sigma} upper limit of 27.1 (AB magnitudes). These properties are only consistent with this object's being a high-z Ly{alpha} emitter. An 18,000 s spectrum obtained with LRIS yields a redshift of 5.74. The object is similar in its continuum shape, line properties, and observed equivalent width to the z=5.60 galaxy HDF 4-473.0, as recently described by Weymann et al., but is 2-3 times more luminous in the line and in the red continuum. For H_0_ = 65 km s^-1^ Mpc^-1^ and q_0_ = (0.02, 0.5), we would require star formation rates of around (40, 7) M_sun_ yr^-1^ to produce the UV continuum in the absence of extinction. Subject headings: cosmology: observations-early universe-galaxies: evolution-galaxies: formation
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