Mid-Infrared Spectroscopy of Two Lensed Star-forming Galaxies

Fadely, Ross; Allam, Sahar S.; Baker, Andrew J.; Lin, Huan; Lutz, Dieter; Shapley, Alice E.; Shin, Min-Su; Smith, J.Allyn; Strauss, Michael A.; Tucker, Douglas L.

doi:10.1088/0004-637X/723/1/729

Mid-Infrared Spectroscopy of Two Lensed Star-forming Galaxies

Journal Article · Wed Sep 01 04:00:00 EDT 2010 · Astrophys.J.

DOI:https://doi.org/10.1088/0004-637X/723/1/729· OSTI ID:2520507

Fadely, Ross ^[1]; ^[2]; ^[1]; ^[2]; Lutz, Dieter ^[3]; ^[4]; Shin, Min-Su ^[5]; Smith, J.Allyn ^[6]; Strauss, Michael A. ^[7]; ^[2]

Rutgers U., Piscataway
Fermilab
Garching, Max Planck Inst., MPE
UCLA
Michigan U.
Austin Peay State U.
Princeton U. Observ.

We present low-resolution, rest-frame ~ 5 - 12 micron Spitzer/IRS spectra of two lensed z ~ 2 UV-bright star-forming galaxies, SDSS J120602.09+514229.5 and SDSS J090122.37+181432.3. Using the magnification boost from lensing, we are able to study the physical properties of these objects in greater detail than is possible for unlensed systems. In both targets, we detect strong PAH emission at 6.2, 7.7, and 11.3 microns, indicating the presence of vigorous star formation. For J1206, we find a steeply rising continuum and significant [S IV] emission, suggesting that a moderately hard radiation field is powering continuum emission from small dust grains. The strength of the [S IV] emission also implies a sub-solar metallicity of ~ 0.5 Z_{Sun}, confirming published rest-frame optical measurements. In J0901, the PAH lines have large rest-frame equivalent widths (> 1 micron) and the continuum rises slowly with wavelength, suggesting that any AGN contribution to L_{IR} is insignificant, in contrast to the implications of optical emission-line diagnostics. Using [O III] line flux as a proxy for AGN strength, we estimate that the AGN in J0901 provides only a small fraction of its mid-infrared continuum flux. By combining the detection of [Ar II] with an upper limit on [Ar III] emission, we infer a metallicity of > 1.3 Z_{Sun}. This work highlights the importance of combining rest-frame optical and mid-IR spectroscopy in order to understand the detailed properties of star-forming galaxies at high redshift.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

DOE Contract Number:: 89243024CSC000002

OSTI ID:: 2520507

Report Number(s):: FERMILAB-PUB-10-424-AE; arXiv:1009.0773; oai:inspirehep.net:867291

Journal Information:: Astrophys.J., Journal Name: Astrophys.J. Vol. 723

Country of Publication:: United States

Language:: English

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