Browsing by Author "Geach, J. E."

Now showing items 21-40 of 55

    • Evolution of cosmic star formation in the SCUBA-2 Cosmology Legacy Survey 

      Bourne, N.; Dunlop, J. S.; Merlin, E.; Parsa, S.; Schreiber, C.; Castellano, M.; Conselice, C. J.; Coppin, K. E. K.; Farrah, D.; Fontana, A.; Geach, J. E.; Halpern, M.; Knudsen, K. K.; Michalowski, M. J.; Mortlock, A.; Santini, P.; Scott, D.; Shu, X. W.; Simpson, C.; Simpson, J. M.; Smith, D. J. B.; Werf, P. van der (2017-05-21)
      We present a new exploration of the cosmic star-formation history and dust obscuration in massive galaxies at redshifts $0.5z 10^{10}M_\odot$ galaxies at $0.5z 10$. One third of this is accounted for by 450$\mu$m-detected ...

    • The evolving far-IR galaxy luminosity function and dust-obscured star-formation rate density out to z~5 

      Koprowski, M. P.; Dunlop, James S.; Michałowski, Michał J.; Coppin, K. E. K.; Geach, J. E.; McLure, Ross J.; Scott, D.; van der Werf, P. (2017-11-11)
      We present a new measurement of the evolving galaxy far-IR luminosity function (LF) extending out to redshifts z~5, with resulting implications for the level of dust-obscured star-formation density in the young Universe. ...

    • An extragalactic spectroscopic survey of the SSA22 field 

      Saez, C.; Lehmer, B. D.; Bauer, F. E.; Stern, D.; Gonzales, A.; Rreza, I.; Alexander, D. M.; Matsuda, Y.; Geach, J. E.; Harrison, F. A.; Hayashino, T. (2015-07-01)
      We present Very Large Telescope VIMOS, Keck DEIMOS and Keck LRIS multi-object spectra of 367 sources in the field of the z ≈ 3.09 protocluster SSA22. Sources are spectroscopically classified via template matching, allowing ...

    • The Halo Mass of Optically Luminous Quasars at z ,F≈ ,F1-2 Measured via Gravitational Deflection of the Cosmic Microwave Background 

      Geach, J. E.; Peacock, J. A.; Myers, A. D.; Hickox, R. C.; Burchard, M. C.; Jones, M. L. (2019-03-27)
      We measure the average deflection of cosmic microwave background photons by quasars at 〈Z〉= 1.7. Our sample is selected from the Sloan Digital Sky Survey to cover the redshift range 0.9 ≤z≤2.2 with absolute i-band magnitudes ...

    • Herschel protocluster survey : A search for dusty star-forming galaxies in protoclusters at z = 2-3 

      Kato, Y.; Matsuda, Y.; Smail, Ian; Swinbank, A. M.; Hatsukade, B.; Umehata, H.; Tanaka, I.; Saito, T.; Iono, D.; Tamura, Y.; Kohno, K.; Erb, D. K.; Lehmer, B. D.; Geach, J. E.; Steidel, C. C.; Alexander, D. M.; Yamada, T.; Hayashino, T. (2016-08-21)
      We present a Herschel/Spectral and Photometric Imaging Receiver (SPIRE) survey of three protoclusters at z = 2-3 (2QZCluster, HS1700, SSA22). Based on the SPIRE colours (S350/S250 and S500/S350) of 250 μm sources, we ...

    • The Herschel stripe 82 survey (HerS) : Maps and early catalog 

      Viero, M.P.; Asboth, V.; Roseboom, I.G.; Moncelsi, L.; Marsden, G.; Mentuch Cooper, E.; Zemcov, M.; Addison, G.; Baker, A. J.; Beelen, A.; Bock, J.; Bridge, C.; Conley, A.; Devlin, M. J.; Doré, O.; Farrah, D.; Finkelstein, S.; Font-Ribera, A.; Geach, J. E.; Gebhardt, K.; Gill, A.; Glenn, J.; Hajian, A.; Halpern, M.; Jogee, S.; Kurczynski, P.; Lapi, A.; Negrello, M.; Oliver, S. J.; Papovich, C.; Quadri, R.; Ross, N.; Scott, D.; Schulz, B.; Somerville, R.; Spergel, D. N.; Vieira, J. D.; Wang, L.; Wechsler, R. (2014-02-01)
      We present the first set of maps and band-merged catalog from the Herschel Stripe 82 Survey (HerS). Observations at 250, 350, and 500 μm were taken with the Spectral and Photometric Imaging Receiver instrument aboard the ...

    • Herschel-PACS observations of [O I]63 um towards submillimetre galaxies at z~1 

      Coppin, Kristen; Danielson, A. L. R.; Geach, J. E.; Hodge, J. A.; Swinbank, A.M.; Wardlow, J. L.; Bertoldi, F.; Biggs, A.; Brandt, W.N.; Caselli, P.; Chapman, S. C.; Dannerbauer, H.; Dunlop, James S.; Greve, T.R.; Hamann, F.; Ivison, R. J.; Karim, A.; Knudsen, K. K.; Menten, K. M.; Schinnerer, E.; Smail, Ian; Spaans, M.; Walter, F.; Webb, T. M. A.; van der Werf, P. P. (2012)
      We present Herschel-PACS spectroscopy of the [O I]63 um far-infrared cooling line from a sample of six unlensed and spectroscopically confirmed 870 um selected submillimetre (submm) galaxies (SMGs) at 1.1 <z <1.6 from the ...

    • Imaging the environment of A z = 6.3 submillimeter galaxy with scuba-2 

      Robson, E. I.; Ivison, R. J.; Smail, Ian; Holland, W. S.; Geach, J. E.; Gibb, A. G.; Riechers, D.; Ade, P. A R; Bintley, D.; Bock, J.; Chapin, E. L.; Chapman, S. C.; Clements, D. L.; Conley, A.; Cooray, A.; Dunlop, J. S.; Farrah, D.; Fich, M.; Fu, Hai; Jenness, T.; Laporte, N.; Oliver, S. J.; Omont, A.; Pérez-Fournon, I.; Scott, Douglas; Swinbank, A. M.; Wardlow, J. (2014-08-28)
      We describe a search for submillimeter emission in the vicinity of one of the most distant, luminous galaxies known, HerMES FLS3, at z = 6.34, exploiting it as a signpost to a potentially biased region of the early universe, ...

    • The linear bias of radio galaxies at z~0.3 via cosmic microwave background lensing 

      Devereux, C.; Geach, J. E.; Hardcastle, M. J. (2019-02-26)
      We present a new measurement of the linear bias of radio loud active galactic nuclei (RLAGN) at $z\approx0.3$ and $L_{\rm 1.4GHz}>10^{23}\,{\rm W\,Hz^{-1}}$ selected from the Best & Heckman (2012) sample, made by ...

    • Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole 

      Ramasawmy, J.; Geach, J. E.; Hardcastle, M. J.; Best, P. N.; Bonato, M.; Bondi, M.; Rivera, G. Calistro; Cochrane, R. K.; Conway, J. E.; Coppin, K.; Duncan, K. J.; Dunlop, J. S.; Franco, M.; García-Vergara, C.; Jarvis, M. J.; Kondapally, R.; McCheyne, I.; Prandoni, I.; Röttgering, H. J. A.; Smith, D. J. B.; Tasse, C.; Wang, L. (2021-04-19)
      We investigate the radio properties of a sample of 53 sources selected at 850 $\mu$m from the SCUBA-2 Cosmology Legacy Survey using new deep, low-frequency radio imaging of the Lockman Hole field from the Low Frequency ...

    • A machine-learning method for identifying multi-wavelength counterparts of submillimeter galaxies : training and testing using AS2UDS and ALESS 

      An, FangXia; Stach, S. M.; Smail, Ian; Swinbank, A. M.; Almaini, O.; Hartley, W.; Maltby, D. T.; Ivison, R. J.; Arumugam, V.; Wardlow, J. L.; Cooke, E. A.; Gullberg, B.; Chen, Chian-Chou; Geach, J. E.; Scott, D.; Dunlop, J. S.; Farrah, D.; Werf, P. van der; Blain, A. W.; Conselice, C.; Michałowski, M. J.; Chapman, S. C.; Coppin, K. E. K. (2018-07-27)
      We describe the application of supervised machine-learning algorithms to identify the likely multiwavelength counterparts to submillimeter sources detected in panoramic, single-dish submillimeter surveys. As a training ...

    • A Magnified View of Circumnuclear Star Formation and Feedback around an Active Galactic Nucleus at z = 2.6 

      Geach, J. E.; Ivison, R. J.; Dye, S.; Oteo, I. (2018-10-10)
      We present Atacama Large Millimeter/submillimeter Array observations of an intrinsically radio-bright (L 1.4 GHz = (1.7 ± 0.1) ×10 25 W Hz -1) and infrared luminous (L IR ≈ 10 13 L o) galaxy at z = 2.6. The infrared-to-radio ...

    • Massive compact galaxies with high-velocity outflows : Morphological analysis and constraints on AGN activity 

      Sell, P. H.; Tremonti, C. A.; Hickox, R. C.; Diamond-Stanic, A. M.; Moustakas, J.; Coil, A.; Williams, A.; Rudnick, G.; Robaina, A.; Geach, J. E.; Heinz, S.; Wilcots, E. M. (2014-07-11)
      We investigate the process of rapid star formation quenching in a sample of 12 massive galaxies at intermediate redshift (z ~ 0.6) that host high-velocity ionized gas outflows (v > 1000 km s-1). We conclude that these fast ...

    • Multi-wavelength properties of radio and machine-learning identified counterparts to submillimeter sources in S2COSMOS 

      An, FangXia; Simpson, J. M.; Smail, Ian; Swinbank, A. M.; Ma, Cong; Liu, Daizhong; Lang, P.; Schinnerer, E.; Karim, A.; Magnelli, B.; Leslie, S.; Bertoldi, F.; Chen, Chian-Chou; Geach, J. E.; Matsuda, Y.; Stach, S. M.; Wardlow, J. L.; Gullberg, B.; Ivison, R. J.; Ao, Y.; Coogan, R. T.; Thomson, A. P.; Chapman, S. C.; Wang, R.; Wang, Wei-Hao; Yang, Y.; Asquith, R.; Bourne, N.; Coppin, K.; Hine, N. K.; Ho, L. C.; Hwang, H. S.; Kato, Y.; Lacaille, K.; Lewis, A. J. R.; Oteo, I.; Scholtz, J.; Sawicki, M.; Smith, D. (2019-11-20)
      We identify multi-wavelength counterparts to 1,147 submillimeter sources from the S2COSMOS SCUBA-2 survey of the COSMOS field by employing a recently developed radio$+$machine-learning method trained on a large sample of ...

    • The nature of the variable millimetre-selected AGN in the Brightest Cluster Galaxy of Abell 851 

      Cheale, R. A.; Geach, J. E.; Edge, A. C.; Perrott, Y. C.; Cantwell, T. (2018-11-21)
      We present the detection of a bright 3mm continuum source in the brightest cluster galaxy (BCG) in Abell 0851 (z = 0.411) with the NOrthern Extended Millimeter Array (NOEMA). When this detection is compared to other ...

    • [NII] fine-structure emission at 122 and 205um in a galaxy at z=2.6: a globally dense star-forming interstellar medium 

      Doherty, M. J.; Geach, J. E.; Ivison, R. J.; Dye, S. (2020-12-23)
      We present new observations with the Atacama Large Millimeter/sub-millimeter Array of the 122um and 205um fine-structure line emission of singly-ionised nitrogen in a strongly lensed starburst galaxy at z=2.6. The 122/205um ...

    • Observational limits on the gas mass of a z=4.9 galaxy 

      Livermore, R. C.; Swinbank, A.M.; Smail, Ian; Bower, R. G.; Coppin, Kristen; Crain, R. A.; Edge, A.C.; Geach, J. E.; Richard, J. (2012-10-20)
      We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22 +/- 5x due to strong gravitational lensing by the foreground cluster MS1358+62. ...

    • An orientation bias in observations of submillimetre galaxies 

      Lovell, C. C.; Geach, J. E.; Davé, R.; Narayanan, D.; Coppin, K. E. K.; Li, Q.; Franco, M.; Privon, G. C. (2022-07-28)
      Recent high-resolution interferometric images of submillimetre galaxies (SMGs) reveal fascinatingly complex morphologies. This raises a number of questions: how does the relative orientation of a galaxy affect its observed ...

    • PdBI Cold dust imaging of two extremely red H-[4.5] > 4 galaxies discovered with SEDS and CANDELS 

      Caputi, K. I.; Michałowski, M. J.; Krips, M.; Geach, J. E.; Ashby, M. L N; Huang, J. S.; Fazio, G. G.; Koekemoer, A. M.; Popping, G.; Spaans, M.; Castellano, M.; Dunlop, J. S.; Fontana, A.; Santini, P. (2014-05-30)
      We report Plateau de Bure Interferometer (PdBI) 1.1 mm continuum imaging toward two extremely red H-[4.5] > 4 (AB) galaxies at z > 3, which we have previously discovered making use of Spitzer SEDS and Hubble Space Telescope ...

    • The properties of the star-forming interstellar medium at z=0.8-2.2 from HiZELS II : star formation and clump scaling laws in gas-rich, turbulent disks 

      Swinbank, A.M.; Smail, Ian; Sobral, D.; Theuns, T.; Best, P.N.; Geach, J. E. (2012-12-01)
      We present adaptive optics assisted integral field spectroscopy of nine Ha-selected galaxies at z = 0.84-2.23 drawn from the HiZELS narrowband survey. Our observations map the kinematics of these star-forming galaxies on ...