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An AzTEC 1.1mm Survey of a Highly-biased Extragalactic Field - Tracing Accelerated Galaxy Formation at z~3.8 towards 4C41.17

Hughes, David, Ade, Peter A. R., Aretxaga, I., Austermann, J., Bock, J. J., Dunlop, J., Gaztanagal, E., Ivison, R., Kang, Y., Kim, S., Lowenthal, J., Mauskopf, Philip, Montana, A., Plionis, M., Scott, K., Smail, I, Stevens, J., Wagg, J., Wilson, G. and Yun, M. 2007. An AzTEC 1.1mm Survey of a Highly-biased Extragalactic Field - Tracing Accelerated Galaxy Formation at z~3.8 towards 4C41.17. Presented at: 2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #95.03, Seattle, WA, USA, 5-10 January 2007.

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Aztec has recently conducted a sensitive, wide-area (300 sq. arcmin's) continuum survey at 1.1mm using the 15-m James Clerk Maxwell Telescope towards 4C41.17, a powerful high-redshift (z 3.8) radio galaxy. These Aztec data, which cover an area >40 times larger than our previous SCUBA survey, reveal a significant over-density of luminous, massive dust-enshrouded galaxies, compared to the results from lower-redshift blank-field sub-mm surveys. One natural interpretation of these new AzTEC data is that the over-density is tracing a large (5 x 5 Mpc) "proto-cluster" structure at z 3.8 associated with the environment of 4C41.17, within which the formation of ultra-luminous starburst galaxies (with rest-frame FIR luminosities >5 x 10^12 Lsun or SFRs > 500 Msun/yr) is taking place at an accelerated rate. Proving the physical association of these massive optically-faint starbursts with the environment of this high-z AGN, and not with the blank-field sub-mm population, for which 50% of the population lies at 1.9 < z < 2.9, remains an outstanding problem. In this presentation we will describe the AzTEC survey, the empirical evidence for this protocluster structure in the early universe, and the planned multi-wavelength follow-up observations of the brightest AzTEC sources towards 4C41.17 that may demonstrate that we are witnessing accelerated galaxy formation, via an increased rate of merging gas-rich galaxies within a rapidly-developing gravitational potential. AzTEC is one of the suite of instruments destined for the 50-m Large Millimeter Telescope (LMT). We will conclude this presentation with a summary of future LMT observations that will trace the evolution of obscured starformation in the dynamic environments towards a significant sample of intermediate and high-z powerful AGN with greater sensitivity and spatial resolution.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Last Modified: 04 Jun 2017 04:27

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