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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 448234.0, MPI für Astronomie / Publikationen_mpia
CO line emission in the halo of a radio galaxy at z = 2.6
Authors:Nesvadba, N. P. H.; Neri, R.; De Breuck, C.; Lehnert, M. D.; Downes, D.; Walter, F.; Omont, A.; Boulanger, F.; Seymour, N.
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Volume:395
Start Page:L16
End Page:L20
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We report the detection of luminous CO(3-2) line emission in the halo of the z = 2.6 radio galaxy (HzRG) TXS0828+193, which has no detected counterpart at optical to mid-infrared wavelengths implying a stellar mass <~ few ×109Msolar and relatively low star formation rates. With the IRAM Plateau de Bure Interferometer (PdBI), we find two CO emission-line components at the same position at ~80 kpc distance from the HzRG along the axis of the radio jet, with different blueshifts of few 100 km s-1 relative to the HzRG and a total luminosity of ~2 × 1010 K km s-1 pc2 detected at a total significance of ~8sigma. HzRGs have significant galaxy overdensities and extended haloes of metal-enriched gas often with embedded clouds or filaments of denser material, and likely trace very massive dark matter haloes. The CO emission may be associated with a gas-rich, low-mass satellite galaxy with very little ongoing star formation, in contrast to all previous CO detections of galaxies at similar redshifts. Alternatively, the CO may be related to a gas cloud or filament and perhaps jet-induced gas cooling in the outer halo, somewhat in analogy with extended CO emission found in low-redshift galaxy clusters. Based on observations collected at the IRAM Plateau de Bure Interferometer (PdBI). E-mail: nicole.nesvadba@ias.u-psud.fr
Free Keywords:galaxies: high-redshift; galaxies: individual: TXS0828+193; radio lines: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009MNRAS.395L..16N [ID No:1]
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