Browsing Physics & Atmospheric Science Faculty Research, Publications and Presentations 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., 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 ...

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

    Harrison, C. M., D. M. Alexander, A. M. Swinbank, Ian Smail, et al. 2012. "Energetic galaxy-wide outflows in high-redshift ultra-luminous infrared galaxies hosting AGN activity." Monthly Notices of the Royal Astronomical Society 426:1073.
    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., S. C. Chapman, A. M. Swinbank, Ian Smail, et al. 2012. "Integral Field Spectroscopy of 2.0<z<2.7 Sub-mm Galaxies; gas morphologies and kinematics." Monthly Notices of the Royal Astronomical Society 424:2232.
    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., Ian Smail, K. E. K. Coppin, D. M. Alexander, et al. 2010. "The LABOCA survey of the Extended Chandra Deep Field South: A photometric redshift survey of submillimetre galaxies." Monthly Notices of the Royal Astronomical Society 415:1479.
    [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., J. L. Wardlow, Ian Smail, A. D. Myers, et al. 2011. "The LABOCA Survey of the Extended Chandra Deep Field South: Clustering of submillimetre galaxies." Monthly Notices of the Royal Astronomical Society 421:284.
    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., V. Mainieri, D. Rafferty, L. Shao, et al. 2010. "The LABOCA survey of the Extended Chandra Deep Field South: Two modes of star formation in AGN hosts?." The Astrophysical Journal 712(2):1287.
    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., Ian Smail, S. C. Chapman, A. W. Blain, et al. 2005. "The Relationship Between Stellar and Black-Hole Mass in Submillimeter Galaxies." The Astrophysical Journal 635(2): 853-863
    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., E. L. Chapin, A. M. J. Mortier, S. E. Scott, et al. 2006. "The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- II. Submillimetre maps, catalogue and number counts." Monthly Notices of the Royal Astronomical Society 372(4): 1621-1652
    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., M. Vaccari, T. Babbedge, S. Oliver, et al. 2008. "The SCUBA HAlf-Degree Extragalactic Survey (SHADES) - VIII. The Nature of Faint Submm Galaxies in SHADES, SWIRE and SXDF Surveys." Monthly Notices of the Royal Astronomical Society 387(1): 247-267.
    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., 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 ...

  • The Stellar Mass Content of Submillimeter-Selected Galaxies 

    Hainline, L. J., A. W. Blain, I. Smail, D. M. Alexander, et al. 2010. "The Stellar Mass Content of Submillimeter-Selected Galaxies." The Astrophysical Journal 740:96.
    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., W. N. Brandt, I. Smail, A. M. Swinbank, et al. 2008. "Weighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nuclei." The Astronomical Journal 135(5): 1968-1981
    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., F. E. Bauer, S. C. Chapman, I. Smail, et al. 2005. "The X-ray Spectral Properties of SCUBA Galaxies." The Astrophysical Journal 632(2): 736-750
    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 ...