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CASSOWARY 20: a Wide Separation Einstein Cross Identified with the X-shooter Spectrograph | | Max Pettini
; Lise Christensen
; Sandro D'Odorico
; Vasily Belokurov
; N. Wyn Evans
; Paul C. Hewett
; Sergey Koposov
; Elena Mason
; Joel Vernet
; | | Date: |
17 Sep 2009 | | Abstract: | We have used spectra obtained with X-shooter, the triple arm optical-infrared
spectrograph recently commissioned on the Very Large Telescope (VLT) of the
European Southern Observatory (ESO), to confirm the gravitational lens nature
of the CASSOWARY candidate CSWA 20. This system consists of a luminous red
galaxy at redshift z(abs) = 0.741, with a very high velocity dispersion
sigma(lens) = 500 km/s, which lenses a blue star-forming galaxy at z(em) =
1.433 into four images with separations of about 3 arcseconds. The source
shares many of its properties with those of UV-selected galaxies z = 2-3: it is
forming stars at a rate of 25 solar masses per year, has a metallicity of about
1/4 solar, and shows nebular emission from two components separated by 0.4
arcseconds in the image plane, possibly indicating a merger. It appears that
foreground interstellar material within the galaxy has been evacuated from the
sight-line 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. | | Source: | arXiv, 0909.3301 | | Services: | Forum | Review | PDF | Favorites | |
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