Near‐Infrared Spectroscopy of Powerful Radio Galaxies atz= 2.2–2.6 | Zendy

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Near‐Infrared Spectroscopy of Powerful Radio Galaxies atz= 2.2–2.6

Author(s) -

A. Evans

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/305580

Subject(s) - physics , astrophysics , doubly ionized oxygen , galaxy , luminous infrared galaxy , redshift , extinction (optical mineralogy) , spectroscopy , emission spectrum , radio galaxy , spectral line , astronomy , optics

Near-infrared spectroscopy (rest-frame 3700-6800 Angstroms) of eight highredshift powerful radio galaxies (HzPRGs) at z = 2.2-2.6 is presented. Strongforbidden lines and H-alpha emission were detected in all sources; the datashow evidence that the emission lines of the HzPRGs may contribute asubstantial fraction (approx. 25-98%) of their total observed H - and/or K-band light. Diagnostic emission-line ratios for three of the eight HzPRGs areconsistent with the presence of a Seyfert 2 nucleus; the [O III] 5007 / H-betaand [S II] 6716, 6731 / H-alpha ratios and/or limits of the remaining fivegalaxies are inconclusive. Furthermore, all six of the galaxies for which bothH - and K -band spectra were obtained have observed [O III] 5007 / (H-alpha +[NII] 6548, 6583) ratios consistent with Seyfert 2 ionization...Comment: LaTex, 39 pages with 9 postscript figures and 2 gif figures, ApJ accepte

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