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CASSOWARY 20: a wide separation Einstein Cross identified with the X-shooter spectrograph

Pettini, Max ; Christensen, Lise ; D'Odorico, Sandro ; Belokurov, Vasily ; Evans, N. Wyn ; Hewett, Paul C. ; Koposov, Sergey ; Mason, Elena ; Vernet, Joël

Monthly notices of the Royal Astronomical Society, 2010-03, Vol.402 (4), p.2335-2343 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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  • Título:
    CASSOWARY 20: a wide separation Einstein Cross identified with the X-shooter spectrograph
  • Autor: Pettini, Max ; Christensen, Lise ; D'Odorico, Sandro ; Belokurov, Vasily ; Evans, N. Wyn ; Hewett, Paul C. ; Koposov, Sergey ; Mason, Elena ; Vernet, Joël
  • Assuntos: Astrophysics ; galaxies: evolution ; galaxies: structure ; gravitational lensing ; Luminosity ; Stars & galaxies
  • É parte de: Monthly notices of the Royal Astronomical Society, 2010-03, Vol.402 (4), p.2335-2343
  • Notas: ark:/67375/HXZ-2D5L587H-1
    istex:74D24F2EBBB1EC4554606C1F4D001374C048DAE1
    Based on public data from the X-shooter commissioning observations collected at the European Southern Observatory VLT/Melipal telescope, Paranal, Chile.
    Based on public data from the X‐shooter commissioning observations collected at the European Southern Observatory VLT/Melipal telescope, Paranal, Chile.
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: We have used spectra obtained with X-shooter, the triple arm optical–infrared spectrograph recently commissioned on the Very Large Telescope of the European Southern Observatory, to confirm the gravitational lens nature of the CAmbridge Sloan Survey Of Wide ARcs in the skY (CASSOWARY) candidate CSWA 20. This system consists of a luminous red galaxy at redshift zabs= 0.741, with a very high velocity dispersion, σlens≃ 500 km s−1, which lenses a blue star-forming galaxy at zem= 1.433 into four images with a mean separation of ∼6 arcsec. The source shares many of its properties with those of UV-selected galaxies at z= 2–3: it is forming stars at a rate SFR ≃ 25 M⊙ yr−1, has a metallicity of ∼1/4 solar and shows nebular emission from two components separated by 0.4 arcsec (in the image plane), possibly indicating a merger. It appears that foreground interstellar material within the galaxy has been evacuated from the sightline along which we observe the starburst, giving an unextinguished view of its stars and H ii regions. CSWA 20, with its massive lensing galaxy producing a high magnification of an intrinsically luminous background galaxy, is a promising target for future studies at a variety of wavelengths.
  • Editor: Oxford, UK: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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