FIRST "Winged" and X-shaped Radio Source Candidates: II. New Redshifts

Details FIRST "Winged" and X-shaped Radio Source Candidates: II. New Redshifts FIRST "Winged" and X-shaped Radio Source Candidates: II. New Redshifts

2008-11-24

arxiv.org/abs/0811.3942v2

Astrophys.J.Suppl.181:548-556,2009

Astronomy and Astrophysics

Astrophysics

emulateapj style, 10 pages, 4 figures, 2 tables; ApJS accepted with minor revision from submitted version (v1)

Scientific paper

10.1088/0067-0049/181/2/548

We report optical spectroscopic observations of X-shaped radio sources with the Hobby-Eberly Telescope and Multiple-Mirror Telescope, focused on the sample of candidates from the FIRST survey presented in Paper I (Cheung 2007). A total of 27 redshifts were successfully obtained, 21 of which are new, including that of a newly identified candidate source of this type which is presented here. With these observations, the sample of candidates from Paper I is over 50% spectroscopically identified. Two new broad emission-lined X-shaped radio sources are revealed, while no emission lines were detected in about one third of the observed sources; a detailed study of the line properties is deferred to a future paper. Finally, to explore their relation to the Fanaroff-Riley division, the radio luminosities and host galaxy absolute magnitudes of a spectroscopically identified sample of 50 X-shaped radio galaxies are calculated to determine their placement in the Owen-Ledlow plane.

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