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Measurements of CO redshifts with Z-Spec for lensed submillimeter galaxies discovered in the H-ATLAS survey | | R. E. Lupu
; K. S. Scott
; J. E. Aguirre
; I. Aretxaga
; R. Auld
; E. Barton
; A. Beelen
; F. Bertoldi
; J. J. Bock
; D. Bonfield
; C. M. Bradford
; S. Buttiglione
; A. Cava
; D. L. Clements
; J. Cooke
; A. Cooray
; H. Dannerbauer
; A. Dariush
; G. De Zotti
; L. Dunne
; S. Dye
; S. Eales
; D. Frayer
; J. Fritz
; J. Glenn
; D. H. Hughes
; E. Ibar
; R. J. Ivison
; M. J. Jarvis
; J. Kamenetzky
; S. Kim
; G. Lagache
; L. Leeuw
; S. Maddox
; P. R. Maloney
; H. Matsuhara
; E. J. Murphy
; B. J. Naylor
; M. Negrello
; H. Nguien
; A. Omont
; E. Pascale
; M. Pohlen
; E. Rigby
; G. Rodighiero
; S. Serjeant
; D. Smith
; P. Temi
; M. Thompson
; I. Valtchanov
; A. Verma
; J. D. Vieira
; J. Zmuidzinas
; | | Date: |
29 Sep 2010 | | Abstract: | We present new observations from Z-Spec, a broadband 200 - 300 GHz
spectrometer, of sub-millimeter bright lensed sources recently detected by the
Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). Four out of five
sources observed were detected in CO, and their redshifts measured using a new
redshift finding algorithm that uses combinations of the signal-to-noise of all
the lines falling in the Z-Spec bandpass to determine redshifts with high
confidence, even in cases where the signal-to-noise in individual lines is low.
Lower limits for the dust masses (~a few 10^8 M_sun) and spatial extents (~1
kpc equivalent radius) are derived from the continuum spectral energy
distributions, corresponding to dust temperatures between 54 and 69 K. The dust
and gas properties, as determined by the CO line luminosities, are
characteristic of dusty starburst galaxies, with star formation rates of
10^2-10^3 M_sun/yr. In the LTE approximation, we derive relatively low CO
excitation temperature(<100 K) and optical depths (tau < 1). Using a maximum
likelihood technique, we perform a non-LTE excitation analysis of the detected
CO lines in each galaxy to further constrain the bulk molecular gas properties.
We find that the mid-J CO lines measured by Z-Spec localize the best solutions
to either a high-temperature / low-density region, or a low-temperature /
high-density region near the LTE solution, with the optical depth varying
accordingly. Future observations of CO(1-0) or other molecular lines should
help distinguish these scenarios and further illuminate the star-formation
history of these galaxies. | | Source: | arXiv, 1009.5983 | | Services: | Forum | Review | PDF | Favorites | |
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