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HD 202025


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Discovery of an Obscured Broad-Line Region in the High-Redshift Radio Galaxy MRC 2025-218
This Letter presents infrared spectra taken with the newly commissionednear-infrared spectrometer (NIRSPEC) on the Keck II telescope of thehigh-redshift radio galaxy MRC 2025-218 (z=2.63). These observationsrepresent the deepest infrared spectra of a radio galaxy to date andhave allowed for the detection of Hβ, [O III] λλ4959,5007, [O I] λ6300, Hα, [N II] λλ6548, 6583,and [S II] λλ6716, 6713. The Hα emission is verybroad (FWHM=9300 km s-1) and luminous (2.6x1044ergs s-1), and it is very comparable to the line widths andstrengths of radio-loud quasars at the same redshift. This stronglysupports active galactic nucleus unification models linking radiogalaxies and quasars, although we discuss some of the outstandingdifferences. The line [O III] λ5007 is extremely strong and hasextended emission with large relative velocities toward the nucleus. Wealso derive that if the extended emission is due to star formation, eachknot has a star formation rate comparable to a Lyman-break galaxy at thesame redshift.

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Observation and Astrometry data

Constellation:Capricornus
Right ascension:21h14m01.79s
Declination:-22°12'43.6"
Apparent magnitude:6.972
Distance:139.082 parsecs
Proper motion RA:37.2
Proper motion Dec:-10.6
B-T magnitude:7.005
V-T magnitude:6.975

Catalogs and designations:
Proper Names
HD 1989HD 202025
TYCHO-2 2000TYC 6359-1455-1
USNO-A2.0USNO-A2 0675-36248864
HIPHIP 104810

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