An ultraviolet ultra-luminous lyman break galaxy at Z = 2.78 in NDWFS boötes field

摘要: We present one of the most ultraviolet (UV) luminous Lyman break galaxies (LBGs; J1432+3358) at z = 2.78, discovered in NOAO Deep Wide-Field Survey Booetes field. The R-band magnitude J1432+3358 is 22.29 AB, more than two magnitudes brighter typical L* LBGs this redshift. deep z-band image reveals components separated by 1.''0 with a flux ratio 3:1. high signal-to-noise rest-frame UV spectrum shows Ly{alpha} emission line and interstellar medium absorption lines. absence N V C IV lines, non-detection X-ray radio wavelengths mid-infrared (MIR) colors indicates weak or no active galactic nuclei (<10%) galaxy. galaxy broader profile, FWHM about 1000 km s{sup -1} larger outflow velocity ( Almost-Equal-To 500 -1}) those {approx} 3 LBGs. physical properties are derived fitting spectral energy distribution (SED) stellar synthesis models. dust extinction, E(B - V) 0.12, similar to that normal star formation rates (SFRs) from SED dust-corrected consistent each other,more » {approx}300 M{sub Sun} yr{sup -1}, mass (1.3 {+-} 0.3) Multiplication-Sign 10{sup 11} Sun }. SFR an order higher SED-fitting results support has continuous history, episode 6.3 8} yr. morphology its suggest early phase 3:1 merger process. unique low space number density ({approx}10{sup -7} Mpc{sup -3}) interpretation such either found short unobscured small fraction intensive star-forming unobscured.« less