[OIII] emitters in the field of the MRC 0316-257 protocluster

Abstract

Venemans et al. (2005) found evidence for an overdensity of Ly-alpha emission line galaxies associated with the radio galaxy MRC 0316-257 at z=3.13 indicating the presence of a massive protocluster. Here, we present the results of a search for additional star-forming galaxies and AGN within the protocluster. Narrow-band infrared imaging was used to select candidate [O III] emitters in a 1.1 x 1.1 Mpc^2 region around the radio galaxy. Thirteen candidates have been detected. Four of these are among the previously confirmed sample of Ly-alpha galaxies, and an additional three have been confirmed through follow-up infrared spectroscopy. The three newly confirmed objects lie within a few hundred km/s of each other, but are blueshifted with respect to the radio galaxy and Ly-alpha emitters by ~2100 km/s. Although the sample is currently small, our results indicate that the radio-selected protocluster is forming at the centre of a larger, ~60 co-moving Mpc super-structure. On the basis of an HST/ACS imaging study we calculate dust-corrected star-formation rates and investigate morphologies and sizes of the [O III] candidate emitters. From a comparison of the star formation rate derived from UV-continuum and [O III] emission, we conclude that at least two of the [O III] galaxies harbour an AGN which ionized the O+ gas.

11 pages, 6 figures. Accepted for publication in MNRAS

References in corpus (9)

• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters
• The Spiderweb galaxy: a forming massive cluster galaxy at z~2
• Diffuse UV light associated with the Spiderweb Galaxy: evidence for in-situ star formation outside galaxies
• Large-scale structure of Lyman break galaxies around a radio galaxy protocluster at z~4
• Proto-clusters in the Lambda CDM Universe
• Tracing large-scale structure at high redshift with Lyman-alpha emitters: the effect of peculiar velocities
• Rest-Frame Ultraviolet to Near Infrared Observations of an Interacting Lyman Break Galaxy at z = 4.42

Cited by in corpus (5)

• Spectroscopic Confirmation of an Ultra Massive and Compact Galaxy at z=3.35: A Detailed Look at an Early Progenitor of Local Most Massive Ellipticals
• [OIII] emission line as a tracer of star-forming galaxies at high redshifts: Comparison between H$\alpha$ and [OIII] emitters at $z$=2.23 in HiZELS
• Spitzer's View of the Candidate Cluster and Protocluster Catalog (CCPC)
• Multiple emission lines of H$\alpha$ emitters at $z\sim 2.3$ from the broad and medium-band photometry in the ZFOURGE Survey
• The Physical Properties of Star-Forming Galaxies with Strong [O III] Lines at z=3.25