Browsing Chapman, Scott by Author "Geach, J. E."

Now showing items 1-9 of 9

  • The Chandra Deep Protocluster Survey: Evidence for an Enhancement in the AGN Activity in the SSA22 Protocluster at z = 3.09 

    Lehmer, B. D., D. M. Alexander, J. E. Geach, Ian Smail, et al. 2009. "The Chandra Deep Protocluster Survey: Evidence for an Enhancement in the AGN Activity in the SSA22 Protocluster at z = 3.09." The Astrophysical Journal 691(1): 687-695
    We present results from a new ultra-deep 400 ks Chandra observation of the SSA22 protocluster at z = 3.09. We have studied the X-ray properties of 234 z ~ 3 Lyman break galaxies (LBGs; protocluster and field) and 158 z = ...

  • The Chandra Deep Protocluster Survey: Lyα Blobs are powered by heating, not cooling 

    Geach, J. E., D. M. Alexander, B. D. Lehmer, Ian Smail, et al. 2009. "The Chandra Deep Protocluster Survey:Lyα Blobs are powered by heating, not cooling." The Astrophysical Journal, 700(1): 1-9
    We present the results of a 400ks Chandra survey of 29 extended Ly-alpha emitting nebulae (Ly-alpha Blobs, LABs) in the z=3.09 proto-cluster in the SSA22 field. We detect luminous X-ray counterparts in five LABs, implying ...

  • The Chandra Deep Protocluster Survey: Point-Source Catalogs for a 400 ks Observation of the z = 3.09 Protocluster in SSA22 

    Lehmer, B. D., D. M. Alexander, S. C. Chapman, Ian Smail, et al. 2009. "The Chandra Deep Protocluster Survey: Point-Source Catalogs for a 400 ks Observation of the z = 3.09 Protocluster in SSA22." Monthly Notices of the Royal Astronomical Society 400:299.
    We present X-ray point-source catalogs for a deep 400 ks Chandra ACIS-I exposure of the SSA22 field. The observations are centred on a z = 3.09 protocluster, which is populated by Lyman break galaxies (LBGs), Lyalpha ...

  • Restframe Optical Spectroscopic Classifications for Submillimeter Galaxies 

    Takata, Tadafumi, Kazuhiro Sekiguchi, Ian Smail, Scott C. Chapman, et al. 2006. "Restframe Optical Spectroscopic Classifications for Submillimeter Galaxies." The Astrophysical Journal 651(2): 713-727
    We report the results of a systematic near-infrared spectroscopic survey using the Subaru, VLT and Keck Telescopes of a sample of high redshift Ultra-luminous Infrared Galaxies (ULIRGs) mainly composed of submillimeter-selected ...

  • The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450um-selected galaxies and their contribution to the cosmic infrared background 

    Geach, J. E., E. L. Chapin, K. E. K. Coppin, J. S. Dunlop, et al. 2012. "The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450um-selected galaxies and their contribution to the cosmic infrared background." Monthly Notices of the Royal Astronomical Society 432:53.
    The first deep blank-field 450um map (1-sigma~1.3mJy) from the SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin^2 of the COSMOS field, ...

  • The SCUBA-2 Cosmology Legacy Survey: demographics of the 450 \mu m-population 

    Roseboom, I. G., J. S. Dunlop, M. Cirasuolo, J. E. Geach, et al. 2013. "The SCUBA-2 Cosmology Legacy Survey: demographics of the 450 \mu m-population." Monthly Notices of the Royal Astronomical Society 436:430.
    We investigate the multi-wavelength properties of a sample of 450-\mu m selected sources from the SCUBA-2 Cosmology Legacy Survey (S2CLS). A total of 69 sources were identified above 4\sigma\ in deep SCUBA-2 450-\mu m ...

  • The SCUBA-2 Cosmology Legacy Survey: Ultraluminous star-forming galaxies in a z=1.6 cluster 

    Smail, Ian, J. E. Geach, A. M. Swinbank, K. Tadaki, et al. 2013. "The SCUBA-2 Cosmology Legacy Survey: Ultraluminous star-forming galaxies in a z=1.6 cluster." The Astrophysical Journal 182(1): 19.
    We analyse new SCUBA-2 submillimeter and archival SPIRE far-infrared imaging of a z=1.62 cluster, Cl0218.3-0510, which lies in the UKIDSS/UDS field of the SCUBA-2 Cosmology Legacy Survey. Combining these tracers of obscured ...

  • Spitzer identifications and classifications of submillimeter galaxies in giant, high-redshift Lyman-alpha emission-line nebulae 

    Geach, J. E., Ian Smail, S. C. Chapman, D. M. Alexander, et al. 2007. "Spitzer identifications and classifications of submillimeter galaxies in giant, high-redshift Lyman-alpha emission-line nebulae." The Astrophysical Journal 655(1): 9-L12
    Using Spitzer Space Telescope IRAC (3.6-8um) and MIPS (24um) imaging, as well as Hubble Space Telescope optical observations, we identify the IRAC counterparts of the luminous power sources residing within the two largest ...

  • A submm survey of Lyman-alpha haloes in the SA22 protocluster at z=3.1 

    Geach, J. E., Y. Matsuda, Ian Smail, S. C. Chapman, et al. 2005. "A submm survey of Lyman-alpha haloes in the SA22 protocluster at z=3.1." Monthly Notices of the Royal Astronomical Society 363(4): 1398-1408
    We present the results from a submm survey of a sample of 23 giant Lya emitting nebulae in the overdensity at z=3.09 in the SA22 field. These objects, which have become known as Lya Blobs (LABs) have a diverse range of ...