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A detailed gravitational lens model based on submillimeter array and Keck adaptive optics imaging of a Herschel-Atlas submillimeter galaxy at z=4.243

Bussmann, R. S., Gurwell, M. A., Fu, Hai, Smith, D. J. B., Dye, S., Auld, Robbie Richard, Baes, M., Baker, A. J., Bonfield, D., Cava, A., Clements, D. L., Cooray, A., Coppin, K., Dannerbauer, H., Dariush, A., De Zotti, G., Dunne, Loretta, Eales, Stephen Anthony, Fritz, J., Hopwood, R., Ibar, E., Ivison, R. J., Jarvis, M. J., Kim, S., Leeuw, L. L., Maddox, Steve, Michallowski, M. J., Negrello, M., Pascale, Enzo, Pohlen, Michael, Riechers, D. A., Rigby, E., Scott, Douglas, Temi, P., Van der Werf, P. P., Wardlow, J., Wilner, D. and Verma, A. 2012. A detailed gravitational lens model based on submillimeter array and Keck adaptive optics imaging of a Herschel-Atlas submillimeter galaxy at z=4.243. Astrophysical Journal 756 (2) , 134. 10.1088/0004-637X/756/2/134

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Abstract

We present high-spatial resolution imaging obtained with the Submillimeter Array (SMA) at 880 μm and the Keck adaptive optics (AO) system at the K S-band of a gravitationally lensed submillimeter galaxy (SMG) at z = 4.243 discovered in the Herschel Astrophysical Terahertz Large Area Survey. The SMA data (angular resolution ≈0farcs6) resolve the dust emission into multiple lensed images, while the Keck AO K S-band data (angular resolution ≈0farcs1) resolve the lens into a pair of galaxies separated by 0farcs3. We present an optical spectrum of the foreground lens obtained with the Gemini-South telescope that provides a lens redshift of z lens = 0.595 ± 0.005. We develop and apply a new lens modeling technique in the visibility plane that shows that the SMG is magnified by a factor of μ = 4.1 ± 0.2 and has an intrinsic infrared (IR) luminosity of L IR = (2.1 ± 0.2) × 1013 L ☉. We measure a half-light radius of the background source of r s = 4.4 ± 0.5 kpc which implies an IR luminosity surface density of ΣIR = (3.4 ± 0.9) × 1011 L ☉ kpc–2, a value that is typical of z > 2 SMGs but significantly lower than IR luminous galaxies at z ~ 0. The two lens galaxies are compact (r lens ≈ 0.9 kpc) early-types with Einstein radii of θE1 = 0.57 ± 0.01 and θE2 = 0.40 ± 0.01 that imply masses of M lens1 = (7.4 ± 0.5) × 1010 M ☉ and M lens2 = (3.7 ± 0.3) × 1010 M ☉. The two lensing galaxies are likely about to undergo a dissipationless merger, and the mass and size of the resultant system should be similar to other early-type galaxies at z ~ 0.6. This work highlights the importance of high spatial resolution imaging in developing models of strongly lensed galaxies discovered by Herschel.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: evolution; galaxies: fundamental parameters; galaxies: high-redshift; gravitational lensing: strong
Publisher: IOP Science
ISSN: 0004-637X
Last Modified: 04 Jun 2017 05:48
URI: http://orca-mwe.cf.ac.uk/id/eprint/53743

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