2004A&A...428..817K


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET11:50:11

2004A&A...428..817K - Astronomy and Astrophysics, volume 428, 817-821 (2004/12-4)

A search for clusters at high redshift. IV. Spectroscopy of Hα emitters in a proto-cluster at z = 2.16.

KURK J.D., PENTERICCI L., OVERZIER R.A., ROETTGERING H.J.A. and MILEY G.K.

Abstract (from CDS):

Radio galaxy PKS 1138-262 is a massive galaxy at z=2.16, located in a dense environment. We have found an overdensity of Lyα emitting galaxies in this field, consistent with a proto-cluster structure associated with the radio galaxy. Recently, we have discovered forty candidate Hα emitters by their excess near infrared narrow band flux. Here, we present infrared spectroscopy of nine of the brightest candidate Hα emitters. All these candidates show an emission line at the expected wavelength. The identification of three of these lines with Hα is confirmed by accompanying [NII] emission. The spectra of the other candidates are consistent with Hα emission at z∼2.15, one being a QSO as indicated by the broadness of its emission line. The velocity dispersion of the emitters (360km/s) is significantly smaller than that of the narrow band filter used for their selection (1600km/s). We therefore conclude that the emitters are associated with the radio galaxy. The star formation rates (SFRs) deduced from the Hα flux are in the range 6-44M/yr and the SFR density observed is 5-10 times higher than in the HDF-N at z=2.23. The properties of the narrow emission lines indicate that the emitters are powered by star formation and contain very young (<100Myr) stellar populations with moderately high metallicities.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: clusters: general - galaxies: evolution - cosmology: observations - cosmology: early Universe

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [KPR2004] HA 144 EmO 11 40 43.5 -26 29 37           ~ 2 0
2 [KPR2004] HA 284 EmO 11 40 45.6 -26 29 02           ~ 2 0
3 [KPR2004] HA 215 QSO 11 40 45.96 -26 29 16.7     20.80     ~ 4 0
4 [KPR2004] HA 229 EmO 11 40 46.1 -26 29 12           ~ 10 0
5 [KPR2004] HA 183 EmO 11 40 46.2 -26 29 25           ~ 2 0
6 [KPR2004] HA 329 EmO 11 40 46.9 -26 28 41           ~ 2 0
7 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 253 1
8 [KPR2004] HA 207 EmO 11 40 50.2 -26 29 21           ~ 2 0
9 [TTM2013] 635 EmO 11 40 51.20 -26 29 38.5         23.45 ~ 6 0
10 [KPR2004] HA 79 EmO 11 40 52.6 -26 30 01           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.01.27-11:50:11

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