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ALMA를 통한 분자운의 감지

Detection of molecular gas in an ALMA [CII]-identified Submillimetre Galaxy at z=4.44
  • 작성자 : KASI
  • 작성일 : 2014-07-16
  • 조회수 : 2994
  • 저자M. T. Huynh, A. E. Kimball, R. P. Norris, Ian Smail, K. E. Chow, K. E. K. Coppin, B. H. C. Emonts, R. J. Ivison, V. Smol?i? and A. M. Swinbank
  • Absract

     

     

     

     

    We present the detection of 12^CO(2–1) in the z = 4.44 submillimetre galaxy ALESS65.1 using the Australia Telescope Compact Array. A previous Atacama Large Millimeter/submillimeter Array study of submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South determined the redshift of this optically and near-infrared undetected source through the measurement of [C II] 157.74 μm emission. Using the luminosity of the 12^CO(2–1) emission, we estimate the gasmass to beMgas ∼1.7×10^10M. The gas depletion time-scale of ALESS65.1 is ∼ 25 Myr, similar to other high-redshift SMGs and consistent with z > 4 SMGs being the progenitors of massive ‘red-and-dead’ galaxies at z > 2. The ratio of the [C II], 12^CO and farinfrared luminosities implies a strong far-ultraviolet field ofG0 ∼10^3.25, which is at the high end of the far-ultraviolet fields seen in local starbursts, but weaker than the far-ultraviolet fields of most nearby ultraluminous infrared galaxies (ULIRGs). The high ratio of L[C II]/LFIR = 1.0 × 10^−3 observed in ALESS65.1, combined with L[C II]/LCO ∼ 2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.

     


  • 게재정보Monthly notices letters of the royal astronomical society(2014. 07.)에 실린 연구논문을 게시함
  • 첨부파일
  • 원 문http://mnrasl.oxfordjournals.org/content/443/1/L54
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