Evidence for cold accretion onto a massive galaxy at high redshift ?

Daniel Smith, M.J. Jarvis

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)
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Abstract

In this Letter we report on the discovery of a z = 2.83 Lyman alpha Blob (LAB) found in our wide-field narrow-band survey within the Spitzer First Look Survey region. The blob is extended over at least 95 kpc and has a total Lyman alpha luminosity of 2.1 x 10(44) erg s(-1). It is only the sixth LAB known of this scale (> 50 kpc), and is associated with an embedded continuum source in g', R, i', K and 4.5-mu m bands. The LAB's optical spectrum shows clumpy structures and tantalising hints of a sharp red cut-off and shear within the Lyman alpha emission line. Studies of the LAB's surface brightness profile and of the continuum counterpart's spectral energy distribution indicate that the profuse Lyman alpha emission is consistent with being powered by cold gas accreting onto a massive dark matter halo.

Original languageEnglish
Pages (from-to)L49-L53
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume378
Issue number1
DOIs
Publication statusPublished - 2007

Keywords

  • galaxies : formation
  • galaxies : haloes
  • galaxies : high-redshift
  • SPITZER-SPACE-TELESCOPE
  • LY-ALPHA RADIATION
  • COLLAPSING PROTOGALAXIES
  • EXTRAGALACTIC 1ST
  • SOURCE CATALOGS
  • 1ST-LOOK SURVEY
  • RADIO GALAXIES
  • SURVEY FIELD
  • LUMINOSITY
  • STELLAR

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