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Article overview
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An Extremely Luminous Galaxy at z=5.74 | Esther M. Hu
; Richard G. McMahon
; Lennox L. Cowie
; | Date: |
7 Jul 1999 | Journal: | Astrophys.J. 522 (1999) L9-L12 | Subject: | astro-ph | Affiliation: | Univ. of Hawaii, IfA), Richard G. McMahon (Institute of Astronomy, Cambridge), and Lennox L. Cowie (Univ. of Hawaii, IfA | 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 Angstrom bandpass filter centered at 8185 Angstroms during the course of the Hawaii narrowband survey using LRIS on the 10 m Keck II Telescope, and was identified by the equivalent width of the emission W_lambda(observed)=175 Angstroms, flux = 1.7 x 10^{-17} erg 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 mags). These properties are only consistent with this object’s being a high-z Ly alpha emitter. A 10,800 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. (1998), 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) solar masses per year to produce the UV continuum in the absence of extinction. | Source: | arXiv, astro-ph/9907079 | Services: | Forum | Review | PDF | Favorites |
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