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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 421400.0, MPI für Astronomie / Publikationen_mpia
Clarifying the nature of the brightest submillimetre sources: interferometric imaging of LH850.02
Authors:Younger, J. D.; Dunlop, J. S.; Peck, A. B.; Ivison, R. J.; Biggs, A. D.; Chapin, E. L.; Clements, D. L.; Dye, S.; Greve, T. R.; Hughes, D. H.; Iono, D.; Smail, I.; Krips, M.; Petitpas, G. R.; Wilner, D.; Schael, A. M.; Wilson, C. D.
Language:English
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Volume:387
Start Page:707
End Page:712
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present high-resolution interferometric imaging of LH850.02, the brightest 850- and 1200-mum submillimetre (submm) galaxy in the Lockman Hole. Our observations were made at 890mum with the Submillimetre Array (SMA). Our high-resolution submm imaging detects LH850.02 at >~6sigma as a single compact (size <~1arcsec or <~8kpc) point source and yields its absolute position to ~0.2-arcsec accuracy. LH850.02 has two alternative radio counterparts within the Submillimetre Common User Bolometer Array (SCUBA) beam (LH850.02N and LH850.02S), both of which are statistically very unlikely to be so close to the SCUBA source position by chance. However, the precise astrometry from the SMA shows that the submm emission arises entirely from LH850.02N, and is not associated with LH850.02S (by far the brighter of the two alternative identifications at 24mum). Fits to the optical-infrared (IR) multicolour photometry of LH850.02N and LH850.02S indicate that both lie at z ~ 3.3, and are therefore likely to be physically associated. At these redshifts, the 24-mum-to-submm flux density ratios suggest that LH850.02N has an Arp220-type starburst-dominated far-IR spectral energy distribution (SED), while LH850.02S is more similar to Mrk231, with less dust enshrouded star formation activity, but a significant contribution at 24mum (rest frame 5-6mum) from an active nucleus. This complex mix of star formation and active galactic nucleus (AGN) activity in multicomponent sources may be common in the high-redshift ultraluminous galaxy population, and highlights the need for precise astrometry from high-resolution interferometric imaging for a more complete understanding.
Free Keywords:galaxies: formation; galaxies: high-redshift; galaxies: starburst; cosmology: observations; submillimetre
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008MNRAS.387..707Y [ID No:1]
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