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Detection of Far-Infrared and Polycyclic Aromatic Hydrocarbon Emission from the Cosmic Eye: Probing the Dust and Star Formation of Lyman Break Galaxies

Siana, B. and Smail, Ian and Swinbank, A. M. and Richard, J. and Teplitz, H. I. and Coppin, K. E. K. and Ellis, R. S. and Stark, D. P. and Kneib, J.-P. and Edge, A. C. (2009) Detection of Far-Infrared and Polycyclic Aromatic Hydrocarbon Emission from the Cosmic Eye: Probing the Dust and Star Formation of Lyman Break Galaxies. Astrophysical Journal, 698 (2). pp. 1273-1281. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20090916-135930059

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Abstract

We report the results of a Spitzer infrared (IR) study of the Cosmic Eye, a strongly lensed, L^*_(UV) Lyman break galaxy (LBG) at z = 3.074. We obtained Spitzer mid-IR spectroscopy as well as MIPS 24 and 70 μm photometry. The Eye is detected with high significance at both 24 and 70 μm and, when including a flux limit at 3.5 mm, we estimate an IR luminosity of L_(IR) = 8.3^(+4.7)_(–4.4) × 10^(11) L_⊙ assuming a magnification of 28± 3. This L_(IR) is eight times lower than that predicted from the rest-frame ultraviolet properties assuming a Calzetti reddening law. This has also been observed in other young LBGs, and indicates that the dust reddening law may be steeper in these galaxies. The mid-IR spectrum shows strong polycyclic aromatic hydrocarbon (PAH) emission at 6.2 and 7.7 μm, with equivalent widths near the maximum values observed in star-forming galaxies at any redshift. The L_(PAH)-to-L_(IR) ratio lies close to the relation measured in local starbursts. Therefore, L_(PAH) or L_(MIR) may be used to estimate L_(IR), and thus star formation rate, of LBGs, whose fluxes at longer wavelengths are typically below current confusion limits. We also report the highest redshift detection of the 3.3 μm PAH emission feature. The PAH ratio, L_(6.2)/L_(3.3) = 5.1 ± 2.7, and the PAH-to-LIR ratio, L_(3.3)/L_(IR) = 8.5 ± 4.7 × 10^(–4), are both in agreement with measurements in local starbursts and ultraluminous infrared galaxies (ULIRGs), suggesting that this line may serve as a good proxy for L_(PAH) or L_(IR) at z > 3 with the James Webb Space Telescope.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/698/2/1273DOIArticle
http://www.iop.org/EJ/abstract/0004-637X/698/2/1273/PublisherArticle
ORCID:
AuthorORCID
Siana, B.0000-0002-4935-9511
Smail, Ian0000-0003-3037-257X
Richard, J.0000-0001-5492-1049
Teplitz, H. I.0000-0002-7064-5424
Ellis, R. S.0000-0001-7782-7071
Kneib, J.-P.0000-0002-4616-4989
Additional Information:© 2009 The American Astronomical Society. Received 2009 February 19; accepted 2009 April 13; published 2009 May 28. I.R.S., K.E.K.C., and A.C.E. acknowledge support from STFC. A.M.S. also acknowledges support from the RAS Lockyer Fellowship. J.R. acknowledges support from an EU Marie Curie Fellowship. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Facilities: Spitzer.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Royal Astronomical SocietyUNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: high-redshift; galaxies: individual (J213512.73-010143, Cosmic Eye); infrared: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20090916-135930059
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090916-135930059
Official Citation:Detection of Far-Infrared and Polycyclic Aromatic Hydrocarbon Emission from the Cosmic Eye: Probing the Dust and Star Formation of Lyman Break Galaxies B. Siana, Ian Smail, A. M. Swinbank, J. Richard, H. I. Teplitz, K. E. K. Coppin, R. S. Ellis, D. P. Stark, J.-P. Kneib, and A. C. Edge 2009 ApJ 698 1273-1281 doi: 10.1088/0004-637X/698/2/1273.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15886
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Sep 2009 23:14
Last Modified:15 Nov 2019 03:14

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