Browsing Physics & Atmospheric Science by Author "Alexander, D. M."

Now showing items 1-15 of 15

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

    Lehmer, B. D.; Alexander, D. M.; Geach, J. E.; Smail, Ian; Basu-Zych, A.; Bauer, F. E.; Chapman, S. C.; Matsuda, Y.; Scharf, C. A.; Volonteri, M.; Yamada, T. (2009-01-20)
    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.; Alexander, D. M.; Lehmer, B. D.; Smail, Ian; Matsuda, Y.; Chapman, S. C.; Scharf, C. A.; Ivison, R. J.; Volonteri, M.; Yamada, T.; Blain, A. W.; Bower, R. G.; Bauer, F. E.; Basu-Zych, A. (2009-07-20)
    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.; Alexander, D. M.; Chapman, S. C.; Smail, Ian; Bauer, F. E.; Brandt, W. N.; Geach, J. E.; Matsuda, Y.; Mullaney, J. R.; Swinbank, A. M. (2009-07-24)
    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 ...

  • Energetic galaxy-wide outflows in high-redshift ultra-luminous infrared galaxies hosting AGN activity 

    Harrison, C. M.; Alexander, D. M.; Swinbank, A. M.; Smail, Ian; Alaghband-Zadeh, S.; Bauer, F. E.; Chapman, S. C.; Del Moro, A.; Hickox, R. C.; Ivison, R. J.; Menendez-Delmestre, Karin; Mullaney, J. R.; Nesvadba, N. P. H. (2012-05-08)
    We present integral field spectroscopy observations, covering the [O III]4959,5007 emission-line doublet of eight high-redshift (z=1.4-3.4) ultra-luminous infrared galaxies (ULIRGs) that host Active Galactic Nuclei (AGN) ...

  • Integral Field Spectroscopy of 2.0<z<2.7 Sub-mm Galaxies; gas morphologies and kinematics 

    Alaghband-Zadeh, S.; Chapman, S. C.; Swinbank, A. M.; Smail, Ian; Harrison, C. M.; Alexander, D. M.; Casey, C. M.; Dave, R.; Narayanan, D.; Tamura, Y.; Umehata, J. (2012-05-24)
    We present two-dimensional, integral field spectroscopy covering the rest-frame wavelengths of strong optical emission lines in nine sub-mm-luminous galaxies (SMGs) at 2.0&lt;z&lt;2.7. The GEMINI-NIFS and VLT-SINFONI imaging ...

  • The LABOCA survey of the Extended Chandra Deep Field South: A photometric redshift survey of submillimetre galaxies 

    Wardlow, J. L.; Smail, Ian; Coppin, K. E. K.; Alexander, D. M.; Brandt, W. N.; Danielson, A. L. R.; Luo, B.; Swinbank, A. M.; Walter, F.; Weiss, A.; Xue, Y. Q.; Zibetti, S.; Bertoldi, F.; Biggs, A. D.; Chapman, S. C.; Dannerbauer, H.; Dunlop, J. S.; Gawiser, E.; Ivison, R. J.; Knudsen, K. K.; Kovacs, A.; Lacey, C. G.; Menten, K. M.; Padilla, N.; Rix, H. -W; van der Werf, P. P. (2010-06-10)
    [abridged] We derive photometric redshifts from 17-band optical to mid-IR photometry of 74 robust counterparts to 68 of the 126 submillimetre galaxies (SMGs) selected at 870um by LABOCA observations in the ECDFS. The median ...

  • The LABOCA Survey of the Extended Chandra Deep Field South: Clustering of submillimetre galaxies 

    Hickox, Ryan C.; Wardlow, J. L.; Smail, Ian; Myers, A. D.; Alexander, D. M.; Swinbank, A. M.; Danielson, A. L. R.; Stott, J. P.; Chapman, S. C.; Coppin, K. E. K.; Dunlop, J. S.; Gawiser, E.; Lutz, D.; van der Werf, P.; Weiss, A. (2011-12-01)
    We present a measurement of the spatial clustering of submillimetre galaxies (SMGs) at z = 1-3. Using data from the 870 micron LESS survey, we employ a novel technique to measure the cross-correlation between SMGs and ...

  • The LABOCA survey of the Extended Chandra Deep Field South: Two modes of star formation in AGN hosts? 

    Lutz, D.; Mainieri, V.; Rafferty, D.; Shao, L.; Hasinger, G.; Weiss, A.; Walter, F.; Smail, I.; Alexander, D. M.; Brandt, W. N.; Chapman, S.; Coppin, K.; Schreiber, N. M. Forster; Gawiser, E.; Genzel, R.; Greve, T. R.; Ivison, R. J.; Koekemoer, A. M.; Kurczynski, P.; Menten, K. M.; Nordon, R.; Popesso, P.; Schinnerer, E.; Silverman, J. D.; Wardlow, J.; Xue, Y. Q. (2010-01-30)
    We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing stacked 870um submm emission from a deep and wide map of the Extended Chandra Deep Field South, obtained with LABOCA at the ...

  • The Relationship Between Stellar and Black-Hole Mass in Submillimeter Galaxies 

    Borys, C.; Smail, Ian; Chapman, S. C.; Blain, A. W.; Alexander, D. M.; Ivison, R. J. (2005-12-20)
    We analyze deep X-ray, optical and mid-infrared Spitzer observations of the CDF-N/GOODS-N region to study 13 submillimeter-detected galaxies (SMGs) with spectroscopic redshifts (median z=2.2). We find a correlation between ...

  • The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- II. Submillimetre maps, catalogue and number counts 

    Coppin, K.; Chapin, E. L.; Mortier, A. M. J.; Scott, S. E.; Borys, C.; Dunlop, J. S.; Halpern, M.; Hughes, D. H.; Pope, A.; Scott, D.; Serjeant, S.; Wagg, J.; Alexander, D. M.; Almaini, O.; Aretxaga, I.; Babbedge, T.; Best, P. N.; Blain, A.; Chapman, S.; Clements, D. L.; Crawford, M.; Dunne, L.; Eales, S. A.; Edge, A. C.; Farrah, D.; Gaztanaga, E.; Gear, W. K.; Granato, G. L.; Greve, T. R.; Fox, M.; Ivison, R. J.; Jarvis, M. J.; Jenness, T.; Lacey, C.; Lepage, K.; Mann, R. G.; Marsden, G.; Martinez-Sansigre, A.; Oliver, S.; Page, M. J.; Peacock, J. A.; Pearson, C. P.; Percival, W. J.; Priddey, R. S.; Rawlings, S.; Rowan-Robinson, M.; Savage, R. S.; Seigar, M.; Sekiguchi, K.; Silva, L.; Simpson, C.; Smail, I.; Stevens, J. A.; Takagi, T.; Vaccari, M.; van Kampen, E.; Willott, C. J. (2006-11-11)
    We present the maps, source catalogue and number counts of the largest, most complete and unbiased extragalactic submillimetre survey ever undertaken: the 850-micron SCUBA HAlf Degree Extragalactic Survey (SHADES). Using ...

  • The SCUBA HAlf-Degree Extragalactic Survey (SHADES) - VIII. The Nature of Faint Submm Galaxies in SHADES, SWIRE and SXDF Surveys 

    Clements, D. L.; Vaccari, M.; Babbedge, T.; Oliver, S.; Rowan-Robinson, M.; Davoodi, P.; Ivison, R.; Farrah, D.; Dunlop, J.; Shupe, Dave; Waddington, I.; Simpson, C.; Furusawa, H.; Serjeant, S.; Afonso-Luis, A.; Alexander, D. M.; Aretxaga, I.; Blain, A.; Borys, C.; Chapman, S.; Coppin, K.; Dunne, L.; Dye, S.; Eales, S. A.; Evans, T.; Fang, F.; Frayer, D.; Fox, M.; Gear, W. K.; Greve, T. R.; Halpern, M.; Hughes, D. H.; Jenness, T.; Lonsdale, C. J.; Mortier, A. M. J.; Page, M. J.; Pope, A.; Priddey, R. S.; Rawlings, S.; Savage, R. S.; Scott, D.; Scott, S. E.; Sekiguchi, K.; Smail, I.; Smith, H. E.; Stevens, J. A.; Surace, J.; Takagi, T.; van Kampen, E. (2008-06)
    We present the optical-to-submm spectral energy distributions for 33 radio & mid-IR identified submillimetre galaxies discovered via the SHADES 850 micron SCUBA imaging in the Subaru-XMM Deep Field (SXDF). Optical data for ...

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

    Geach, J. E.; Smail, Ian; Chapman, S. C.; Alexander, D. M.; Blain, A. W.; Stott, J. P.; Ivison, R. J. (2007-01-20)
    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 ...

  • The Stellar Mass Content of Submillimeter-Selected Galaxies 

    Hainline, L. J.; Blain, A. W.; Smail, I.; Alexander, D. M.; Armus, L.; Chapman, S. C.; Ivison, R. J. (2010-06-01)
    We present a new study of the stellar mass in a sample of ~ 70 submillimeter-selected galaxies (SMGs) with accurate spectroscopic redshifts. We fit combinations of stellar population synthesis models and power laws to the ...

  • Weighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nuclei 

    Alexander, D. M.; Brandt, W. N.; Smail, I.; Swinbank, A. M.; Bauer, F. E.; Blain, A. W.; Chapman, S. C.; Coppin, K. E. K.; Ivison, R. J.; Menendez-Delmestre, K. (2008-05-01)
    We place direct observational constraints on the black-hole masses of the cosmologically important z~2 submillimeter-emitting galaxy (SMG; f850>4mJy) population, and use measured host-galaxy masses to explore their ...

  • The X-ray Spectral Properties of SCUBA Galaxies 

    Alexander, D. M.; Bauer, F. E.; Chapman, S. C.; Smail, I.; Blain, A. W.; Brandt, W. N.; Ivison, R. J. (2005-10-20)
    Deep SCUBA surveys have uncovered a large population of massive submm galaxies (SMGs) at z>~1. Although it is generally believed that these galaxies host intense star-formation activity, there is growing evidence that a ...