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Title:
IRS Spectra of Two Ultraluminous Infrared Galaxies at z = 1.3
Authors:
Desai, V.; Armus, L.; Soifer, B. T.; Weedman, D. W.; Higdon, S.; Bian, C.; Borys, C.; Spoon, H. W. W.; Charmandaris, V.; Brand, K.; Brown, M. J. I.; Dey, A.; Higdon, J.; Houck, J.; Jannuzi, B. T.; Le Floc'h, E.; Ashby, M. L. N.; Smith, H. A.
Affiliation:
AA(Division of Physics, Mathematics and Astronomy, Mail Stop 320-47, California Institute of Technology, Pasadena, CA 91125.), AB(Space Infrared Telescope Facility Science Center, Mail Stop 314-6, California Institute of Technology, Pasadena, CA 91125.), AC(Division of Physics, Mathematics and Astronomy, Mail Stop 320-47, California Institute of Technology, Pasadena, CA 91125.; Space Infrared Telescope Facility Science Center, Mail Stop 314-6, California Institute of Technology, Pasadena, CA 91125.), AD(Astronomy Department, Cornell University, Ithaca, NY 14853.), AE(Astronomy Department, Cornell University, Ithaca, NY 14853.), AF(Division of Physics, Mathematics and Astronomy, Mail Stop 320-47, California Institute of Technology, Pasadena, CA 91125.), AG(Division of Physics, Mathematics and Astronomy, Mail Stop 320-47, California Institute of Technology, Pasadena, CA 91125.), AH(Astronomy Department, Cornell University, Ithaca, NY 14853.), AI(Astronomy Department, Cornell University, Ithaca, NY 14853.; Department of Physics, University of Crete, GR-71003 Heraklion, Greece.; Chercheur Associé, Observatoire de Paris, F-75014 Paris, France.), AJ(National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726-6732.), AK(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544.), AL(National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726-6732.), AM(Astronomy Department, Cornell University, Ithaca, NY 14853.), AN(Astronomy Department, Cornell University, Ithaca, NY 14853.), AO(National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726-6732.), AP(Chercheur Associé, Observatoire de Paris, F-75014 Paris, France.; Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AQ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AR(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.)
Publication:
The Astrophysical Journal, Volume 641, Issue 1, pp. 133-139. (ApJ Homepage)
Publication Date:
04/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Evolution, Galaxies: Formation, Galaxies: Starburst, Infrared: Galaxies
DOI:
10.1086/500426
Bibliographic Code:
2006ApJ...641..133D

Abstract

We present low-resolution (64<R<124) mid-infrared (8-38 μm) spectra of two z~1.3 ultraluminous infrared galaxies (ULIRGs) with L8-1000μm~1013 Lsolar. The spectra were taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. Both objects were discovered in the NOAO Deep Wide-Field Survey (NDWFS) Bootes field. MIPS J142824.0+352619 is a bright 160 μm source with a large infrared-to-optical flux density ratio. Previous authors provided evidence for a foreground lens and estimated an amplification of <~10, although this factor is currently poorly constrained. The 6.2, 7.7, 11.3, and 12.8 μm polycyclic aromatic hydrocarbon (PAH) emission bands in its IRS spectrum indicate a redshift of z~1.3. The large equivalent width of the 6.2 μm PAH feature indicates that at least 50% of the mid-infrared energy is generated in a starburst, an interpretation supported by a large [Ne II]/[Ne III] ratio and a low upper limit on the X-ray luminosity. SST24 J142827.19+354127.71 has the brightest 24 μm flux (10.55 mJy) among optically faint (R>20) galaxies in the NDWFS. Its mid-infrared spectrum lacks emission features, but the broad 9.7 μm silicate absorption band places this source at z~1.3. Optical spectroscopy confirms a redshift of z=1.293+/-0.001. Given this redshift, SST24 J142827.19+354127.71 has among the largest rest-frame 5 μm luminosities known. The similarity of its SED to those of known AGN-dominated ULIRGs and its lack of either PAH features or large amounts of cool dust indicate that the mid-infrared emission is dominated by an AGN rather than a starburst.
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