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A bright, dust-obscured, millimetre-selected galaxy beyond the Bullet Cluster (1E0657-56)

Wilson, G. W., Hughes, D. H., Aretxaga, I., Ezawa, H., Austermann, J. E., Doyle, Simon Michael, Ferrusca, D., Hernández-Curiel, I., Kawabe, R., Kitayama, T., Kohno, K., Kuboi, A., Matsuo, H., Mauskopf, Philip Daniel, Murakoshi, Y., Montaña, A., Natarajan, P., Oshima, T., Ota, N., Perera, T. A., Rand, J., Scott, K. S., Tanaka, K., Tsuboi, M., Williams, C. C., Yamaguchi, N. and Yun, M. S. 2008. A bright, dust-obscured, millimetre-selected galaxy beyond the Bullet Cluster (1E0657-56). Monthly Notices of the Royal Astronomical Society 390 (3) , pp. 1061-1070. 10.1111/j.1365-2966.2008.13774.x

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Abstract

Deep 1.1 mm continuum observations of 1E0657−56 (the ‘Bullet Cluster’) taken with the millimeter-wavelength camera AzTEC on the 10-m Atacama Submillimeter Telescope Experiment (ASTE), have revealed an extremely bright (S1.1 mm= 15.9 mJy) unresolved source. This source, MMJ065837−5557.0, lies close to a maximum in the density of underlying mass distribution, towards the larger of the two interacting clusters as traced by the weak-lensing analysis of Clowe et al. Using optical–infrared (IR) colours, we argue that MMJ065837−5557.0 lies at a redshift of z= 2.7 ± 0.2. A lensing-derived mass model for the Bullet Cluster shows a critical line (caustic) of magnification within a few arcsec of the AzTEC source, sufficient to amplify the intrinsic millimetre-wavelength flux of the AzTEC galaxy by a factor of ≫20. After subtraction of the foreground cluster emission at 1.1 mm due to the Sunyaev-Zel'dovich effect, and correcting for the magnification, the rest-frame far-IR luminosity of MMJ065837−5557.0 is ≤1012 L⊙, characteristic of a luminous infrared galaxy (LIRG). We explore various scenarios to explain the colours, morphologies and positional offsets between the potential optical and IR counterparts, and their relationship with MMJ065837−5557.0. Until higher resolution and more sensitive (sub)millimetre observations are available, the detection of background galaxies close to the caustics of massive lensing clusters offers the only opportunity to study this intrinsically faint millimetre-galaxy population.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: high-redshift; galaxies: starburst
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0035-8711/ (accessed 20/02/2014).
Publisher: Royal Astronomical Society
ISSN: 0035-8711
Date of First Compliant Deposit: 30 March 2016
Last Modified: 06 Jun 2019 20:40
URI: http://orca.cf.ac.uk/id/eprint/23217

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