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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448153.0, MPI für Astronomie / Publikationen_mpia
The growth and assembly of a massive galaxy at z ~ 2
Authors:Hatch, N. A.; Overzier, R. A.; Kurk, J. D.; Miley, G. K.; Röttgering, H. J. A.; Zirm, A. W.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Start Page:114
End Page:125
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We study the stellar mass assembly of the Spiderweb galaxy (MRC1138-262), a massive z = 2.2 radio galaxy in a protocluster and the probable progenitor of a brightest cluster galaxy. Nearby protocluster galaxies are identified and their properties are determined by fitting stellar population models to their rest-frame ultraviolet to optical spectral energy distributions. We find that within 150kpc of the radio galaxy the stellar mass is centrally concentrated in the radio galaxy, yet most of the dust-uncorrected, instantaneous star formation occurs in the surrounding low-mass satellite galaxies. We predict that most of the galaxies within 150kpc of the radio galaxy will merge with the central radio galaxy by z = 0, increasing its stellar mass by up to a factor of ~=2. However, it will take several hundred Myr for the first mergers to occur, by which time the large star formation rates are likely to have exhausted the gas reservoirs in the satellite galaxies. The tidal radii of the satellite galaxies are small, suggesting that stars and gas are being stripped and deposited at distances of tens of kpc from the central radio galaxy. These stripped stars may become intracluster stars or form an extended stellar halo around the radio galaxy, such as those observed around cD galaxies in cluster cores.
Free Keywords:galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: high-redshift; galaxies: individual: MRC1138-262
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009MNRAS.395..114H [ID No:1]
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