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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421309.0, MPI für Astronomie / Publikationen_mpia
Infrared and millimetre-wavelength evidence for cold accretion within a z = 2.83 Lyman α blob
Authors:Smith, Daniel J. B.; Jarvis, Matt J.; Lacy, Mark; Martí­nez-Sansigre, Alejo
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Start Page:799
End Page:805
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:This paper discusses infrared and millimetre-wavelength observations of a Lyman alpha blob (LAB) discovered by Smith & Jarvis, a candidate for ionization by the cold accretion scenario discussed in Fardal et al. and Dijkstra et al. We have observed the counterpart galaxy at infrared wavelengths in deep observations with the Spitzer Space Telescope using the IRAC 3.6, 4.5, 5.8 and 8.0mum and MIPS 24 mum bands, as well as using the Max-Planck Millimeter Bolometer (MAMBO-2) at a wavelength of 1.2mm with the IRAM 30 m telescope. These observations probe the >~95kpc Lyman alpha halo for the presence of obscured active galactic nucleus (AGN) components or the presence of a violent period of star formation invoked by other models of ionization for these mysterious objects. 24 mum observations suggest that an obscured AGN would be insufficiently luminous to ionize the halo, and that the star formation rate within the halo may be as low as <140Msolaryr-1 depending on the model spectral energy distribution (SED) used. This is reinforced by our observations at 1.2mm using MAMBO-2, which yield an upper limit of star formation rate <550Msolaryr-1 from our non-detection to a 3sigma flux limit of 0.86 mJy beam-1. Finding no evidence for either AGN or extensive star formation, we conclude that this halo is ionized by a cold accretion process. We derive model SEDs for the host galaxy, and use the Bruzual & Charlot and Maraston libraries to show that the galaxy is well described by composite stellar populations of total mass 3.42 +/- 0.13 × 1011 or 4.35 +/- 0.16 × 1011Msolar depending on the model SEDs used.
Free Keywords:galaxies: haloes; galaxies: high-redshift
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008MNRAS.389..799S [ID No:1]
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