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A resolved map of t...
A resolved map of the infrared excess in a Lyman Break Galaxy at z= 3
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- Koprowski, M. P. (författare)
- University of Hertfordshire
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- Coppin, K. E. K. (författare)
- University of Hertfordshire
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- Geach, J.E. (författare)
- University of Hertfordshire
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- Hine, N. K. (författare)
- University of Hertfordshire
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- Bremer, M. (författare)
- University of Bristol
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- Chapman, S. C. (författare)
- Dalhousie University
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- Davies, L. J. M. (författare)
- University of Western Australia
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- Hayashino, T. (författare)
- Tohoku University
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- Knudsen, Kirsten Kraiberg, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Kubo, M. (författare)
- National Astronomical Observatory of Japan
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- Lehmer, B. D. (författare)
- University of Arkansas - Fayetteville
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- Matsuda, Y. (författare)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Smith, D. J. B. (författare)
- University of Hertfordshire
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- van der Werf, P.P. (författare)
- Universiteit Leiden (UL),Leiden University (UL)
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- Violino, G. (författare)
- University of Hertfordshire
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Yamada, T. (författare)
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(creator_code:org_t)
- 2016-09-08
- 2016
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 828:2
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Abstract
Ämnesord
Stäng
- We have observed the dust continuum of 10 z = 3.1 Lyman break galaxies with the Atacama Large Millimeter/submillimeter Array at similar to 450 mas resolution in Band 7. We detect and resolve the 870 mu m emission in one of the targets with a flux density of S-870 = 192 +/- 57 mu Jy, and measure a stacked 3 sigma signal of S-870 = 67 +/- 23 mu Jy for the remaining nine. The total infrared luminosities are L8-1000 = (8.4 +/- 2.3) x 10(10) L-circle dot for the detection and L8-1000 = (2.9 +/- 0.9) x 10(10) L-circle dot for the stack. With Hubble Space Telescope Advanced Camera for Surveys I-band imaging we map the rest-frame UV emission on the same scale as the dust, effectively resolving the "infrared excess" (IRX = L-FIR/L-UV) in a normal galaxy at z = 3. Integrated over the galaxy we measure IRX = 0.56 +/- 0.15, and the galaxy-averaged UV slope is beta = -1.25 +/- 0.03. This puts the galaxy a factor of similar to 10 below the IRX-beta relation for local starburst nuclei of Meurer et al. However, IRX varies by more than a factor of 3 across the galaxy, and we conclude that the complex relative morphology of the dust relative to UV emission is largely responsible for the scatter in the IRX-beta relation at high-z. A naive application of a Meurer-like dust correction based on the UV slope would dramatically overestimate the total star formation rate, and our results support growing evidence that when integrated over the galaxy, the typical conditions in high-z star-forming galaxies are not analogous to those in the local starburst nuclei used to establish the Meurer relation.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- dust
- submillimeter: ISM
- galaxies: ISM
- extinction
- submillimeter: galaxies
- galaxies: high-redshift
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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- Av författaren/redakt...
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Koprowski, M. P.
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Coppin, K. E. K.
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Geach, J.E.
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Hine, N. K.
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Bremer, M.
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Chapman, S. C.
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visa fler...
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Davies, L. J. M.
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Hayashino, T.
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Knudsen, Kirsten ...
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Kubo, M.
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Lehmer, B. D.
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Matsuda, Y.
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Smith, D. J. B.
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van der Werf, P. ...
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Violino, G.
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Yamada, T.
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visa färre...
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