Browsing by Author "Geach, J.~E."

Now showing items 1-20 of 21

    • ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core 

      Umehata, H.; Tamura, Y.; Kohno, K.; Ivison, R.~J.; Alexander, D.~M.; Geach, J.~E.; Hatsukade, B.; Hughes, D.~H.; Ikarashi, S.; Kato, Y.; Izumi, T.; Kawabe, R.; Kubo, M.; Lee, M.; Lehmer, B.; Makiya, R.; Matsuda, Y.; Nakanishi, K.; Saito, T.; Smail, I.; Yamada, T.; Yamaguchi, Y.; Yun, M. (2015-12-04)
      We report the results of 1farcm5 × 3' mapping at 1.1 mm with the Atacama Large Millimeter/submillimeter Array toward the central region of the z = 3.09 SSA22 protocluster. By combining our source catalog with archival ...

    • ALMA Observations of Ly-alpha Blob 1: Halo Substructure Illuminated from Within 

      Geach, J.~E.; Narayanan, D.; Matsuda, Y.; Hayes, M.; Mas-Ribas, L.; Dijkstra, M.; Steidel, C.~C.; Chapman, S.~C.; Feldmann, R.; Avison, A.; Agertz, O.; Ao, Y.; Birkinshaw, M.; Bremer, M.~N.; Clements, D.~L.; Dannerbauer, H.; Farrah, D.; Harrison, C.~M.; Kubo, M.; Michalowski, M.~J.; Scott, D.; Spaans, M.; Simpson, J.~M.; Swinbank, A.~M.; Taniguchi, Y.; van der Werf, P.; Verma, A.; Yamada, T. (2016-11-14)
      We present new Atacama Large Millimeter/Submillimeter Array (ALMA) 850 μm continuum observations of the original Lyα Blob (LAB) in the SSA22 field at z = 3.1 (SSA22-LAB01). The ALMA map resolves the previously identified ...

    • A Direct Measurement of the Linear Bias of Mid-infrared-selected Quasars at z ap 1 Using Cosmic Microwave Background Lensing 

      Geach, J.~E.; Hickox, R.~C.; Bleem, L.~E.; Brodwin, M.; Holder, G.~P.; Aird, K.~A.; Benson, B.~A.; Bhattacharya, S.; Carlstrom, J.~E.; Chang, C.~L.; Cho, H.-M.; Crawford, T.~M.; Crites, A.~T.; de Haan, T.; Dobbs, M.~A.; Dudley, J.; George, E.~M.; Hainline, K.~N.; Halverson, N.~W.; Holzapfel, W.~L.; Hoover, S.; Hou, Z.; Hrubes, J.~D.; Keisler, R.; Knox, L.; Lee, A.~T.; Leitch, E.~M.; Lueker, M.; Luong-Van, D.; Marrone, D.~P.; McMahon, J.~J.; Mehl, J.; Meyer, S.~S.; Millea, M.; Mohr, J.~J.; Montroy, T.~E.; Myers, A.~D.; Padin, S.; Plagge, T.; Pryke, C.; Reichardt, C.~L.; Ruhl, J.~E.; Sayre, J.~T.; Schaffer, K.~K.; Shaw, L.; Shirokoff, E.; Spieler, H.~G.; Staniszewski, Z.; Stark, A.~A.; Story, K.~T.; van Engelen, A.; Vanderlinde, K.; Vieira, J.~D.; Williamson, R.; Zahn, O. (2013-10-20)
      We measure the cross-power spectrum of the projected mass density as traced by the convergence of the cosmic microwave background lensing field from the South Pole Telescope (SPT) and a sample of Type 1 and 2 (unobscured ...

    • Early Science with the Large Millimeter Telescope: observations of dust continuum and CO emission lines of cluster-lensed submillimetre galaxies at z=2.0-4.7 

      Zavala, J.~A.; Yun, M.~S.; Aretxaga, I.; Hughes, D.~H.; Wilson, G.~W.; Geach, J.~E.; Egami, E.; Gurwell, M.~A.; Wilner, D.~J.; Smail, I.; Blain, A.~W.; Chapman, S.~C.; Coppin, K.~E.~K.; Dessauges-Zavadsky, M.; Edge, A.~C.; Montaña, A.; Nakajima, K.; Rawle, T.~D.; Sánchez-Argüelles, D.; Swinbank, A.~M.; Webb, T.~M.~A.; Zeballos, M. (2015-09-11)
      We present Early Science observations with the Large Millimeter Telescope, AzTEC 1.1 mm continuum images and wide bandwidth spectra (73–111 GHz) acquired with the Redshift Search Receiver, towards four bright lensed ...

    • An enhanced merger fraction within the galaxy population of the SSA22 protocluster at z = 3.1 

      Hine, N.~K.; Geach, J.~E.; Alexander, D.~M.; Lehmer, B.~D.; Chapman, S.~C.; Matsuda, Y. (2016-01-21)
      The overdense environments of protoclusters of galaxies in the early Universe (z > 2) are expected to accelerate the evolution of galaxies, with an increased rate of stellar mass assembly and black hole accretion compared ...

    • Evolution of Dust-obscured Star Formation and Gas to z = 2.2 from HiZELS 

      Thomson, A.~P.; Simpson, J.~M.; Smail, I.; Swinbank, A.~M.; Best, P.~N.; Sobral, D.; Geach, J.~E.; Ibar, E.; Johnson, H.~L. (2017-03-30)
      We investigate the far-infrared (far-IR) properties of galaxies selected via deep, narrow-band imaging of the Hα emission line in four redshift slices from $z=0.40\mbox{--}2.23$ over ~1 deg2 as part of the High-redshift ...

    • Galaxy formation: When the wind blows 

      Geach, J.~E. (2015-03-25)

    • High radio-frequency properties and variability of brightest cluster galaxies 

      Hogan, M.~T.; Edge, A.~C.; Geach, J.~E.; Grainge, K.~J.~B.; Hlavacek-Larrondo, J.; Hovatta, T.; Karim, A.; McNamara, B.~R.; Rumsey, C.; Russell, H.~R.; Salomé, P.; Aller, H.~D.; Aller, M.~F.; Benford, D.~J.; Fabian, A.~C.; Readhead, A.~C.~S.; Sadler, E.~M.; Saunders, R.~D.~E. (2015-10-21)
      We consider the high radio-frequency (15–353 GHz) properties and variability of 35 brightest cluster galaxies (BCGs). These are the most core-dominated sources drawn from a parent sample of more than 700 X-ray selected ...

    • The impact of the dusty torus on obscured quasar halo mass measurements 

      DiPompeo, M.~A.; Runnoe, J.~C.; Hickox, R.~C.; Myers, A.~D.; Geach, J.~E. (2016-07-01)
      Recent studies have found that obscured quasars cluster more strongly and are thus hosted by dark matter haloes of larger mass than their unobscured counterparts. These results pose a challenge for the simplest unification ...

    • A millimetre-wave redshift search for the unlensed HyLIRG, HS1700.850.1 

      Chapman, S.~C.; Bertoldi, F.; Smail, I.; Steidel, C.~C.; Blain, A.~W.; Geach, J.~E.; Gurwell, M.; Ivison, R.~J.; Petitpas, G.~R.; Reddy, N. (2015-10-01)
      We report the redshift of an unlensed, highly obscured submillimetre galaxy (SMG), HS1700.850.1, the brightest SMG (S850 µm = 19.1 mJy) detected in the James Clerk Maxwell Telescope/Submillimetre Common-user Bolometer ...

    • Modelling the number density of H$ emitters for future spectroscopic near-IR space missions 

      Pozzetti, L.; Hirata, C.~M.; Geach, J.~E.; Cimatti, A.; Baugh, C.; Cucciati, O.; Merson, A.; Norberg, P.; Shi, D. (2016-06-01)
      Context. The future space missions Euclid and WFIRST-AFTA will use the Hα emission line to measure the redshifts of tens of millions of galaxies. The Hα luminosity function at z> 0.7 is one of the major sources of uncertainty ...

    • The Red Radio Ring: a gravitationally lensed hyperluminous infrared radio galaxy at z = 2.553 discovered through the citizen science project SPACE WARPS 

      Geach, J.~E.; More, A.; Verma, A.; Marshall, P.~J.; Jackson, N.; Belles, P.-E.; Beswick, R.; Baeten, E.; Chavez, M.; Cornen, C.; Cox, B.~E.; Erben, T.; Erickson, N.~J.; Garrington, S.; Harrison, P.~A.; Harrington, K.; Hughes, D.~H.; Ivison, R.~J.; Jordan, C.; Lin, Y.-T.; Leauthaud, A.; Lintott, C.; Lynn, S.; Kapadia, A.; Kneib, J.-P.; Macmillan, C.; Makler, M.; Miller, G.; Montaña, A.; Mujica, R.; Muxlow, T.; Narayanan, G.; Briain, D.~Ó.; O'Brien, T.; Oguri, M.; Paget, E.; Parrish, M.; Ross, N.~P.; Rozo, E.; Rusu, C.~E.; Rykoff, E.~S.; Sanchez-Argüelles, D.; Simpson, R.; Snyder, C.; Schloerb, F.~P.; Tecza, M.; Wang, W.-H.; Van Waerbeke, L.; Wilcox, J.; Viero, M.; Wilson, G.~W.; Yun, M.~S.; Zeballos, M. (2015-09-01)
      We report the discovery of a gravitationally lensed hyperluminous infrared galaxy (intrinsic LIR ≈ 1013 L⊙) with strong radio emission (intrinsic L1.4 GHz ≈ 1025 W Hz−1) at z = 2.553. The source was identified in the citizen ...

    • The relationship between dust and [C I] at z = 1 and beyond 

      Bourne, N.; Dunlop, J.~S.; Simpson, J.~M.; Rowlands, K.~E.; Geach, J.~E.; McLeod, D.~J. (2019-01-01)
      Measuring molecular gas mass is vital for understanding the evolution of galaxies at high redshifts (z ≳ 1). Most measurements rely on CO as a tracer, but dependencies on metallicity, dynamics, and surface density lead to ...

    • The SCUBA-2 Cluster Snapshot Survey - I. Catalogue of lensed galaxies and submillimetre-bright central galaxies 

      Cheale, R.~A.; Geach, J.~E.; Edge, A.~C.; Blain, A.~W.; Chapman, S.~C.; Egami, E.; Hogan, M.~T.; Rawle, T.~D.; Webb, T.~M.~A. (2019-04-01)
      The SCUBA-2 Cluster Snapshot Survey (S2CSS) observed 202 rich clusters of galaxies at 850 μm in relatively poor submillimetre observing conditions (⁠τ225GHz>0.1⁠) with the aim of identifying rare examples of bright (tens ...

    • The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence' 

      Koprowski, M.~P.; Dunlop, J.~S.; Michalowski, M.~J.; Roseboom, I.; Geach, J.~E.; Cirasuolo, M.; Aretxaga, I.; Bowler, R.~A.~A.; Banerji, M.; Bourne, N.; Coppin, K.~E.~K.; Chapman, S.; Hughes, D.~H.; Jenness, T.; McLure, R.~J.; Symeonidis, M.; Werf, P.~v.~d. (2016-06-01)
      We investigate the properties of the galaxies selected from the deepest 850-μm survey undertaken to date with (Submillimetre Common-User Bolometer Array 2) SCUBA-2 on the James Clerk Maxwell Telescope as part of the SCUBA-2 ...

    • The SCUBA-2 Cosmology Legacy Survey: Multiwavelength Counterparts to 10$^3$ Submillimeter Galaxies in the UKIDSS-UDS Field 

      Chen, C.-C.; Smail, I.; Ivison, R.~J.; Arumugam, V.; Almaini, O.; Conselice, C.~J.; Geach, J.~E.; Hartley, W.~G.; Ma, C.-J.; Mortlock, A.; Simpson, C.; Simpson, J.~M.; Swinbank, A.~M.; Aretxaga, I.; Blain, A.; Chapman, S.~C.; Dunlop, J.~S.; Farrah, D.; Halpern, M.; Michalowski, M.~J.; van der Werf, P.; Wilkinson, A.; Zavala, J.~A. (2016-03-22)
      We present multiwavelength identifications for the counterparts of 1088 submillimeter sources detected at 850 μm in the SCUBA-2 Cosmology Legacy Survey study of the UKIRT Infrared Deep Sky Survey-Ultra-Deep Survey (UDS) ...

    • The SCUBA-2 Cosmology Legacy Survey: the nature of bright submm galaxies from 2 deg$^2$ of 850-$m imaging 

      Michalowski, M.~J.; Dunlop, J.~S.; Koprowski, M.~P.; Cirasuolo, M.; Geach, J.~E.; Bowler, R.~A.~A.; Mortlock, A.; Caputi, K.~I.; Aretxaga, I.; Arumugam, V.; Chen, C.-C.; McLure, R.~J.; Birkinshaw, M.; Bourne, N.; Farrah, D.; Ibar, E.; van der Werf, P.; Zemcov, M. (2017-07-21)
      We present physical properties [redshifts (z), star-formation rates (SFRs) and stellar masses (⁠Mstar⁠)] of bright (S850 ≥ 4 mJy) submm galaxies in the ≃2 deg2 COSMOS and UDS fields selected with SCUBA-2/JCMT. We complete ...

    • SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-end Counts at 450 $m 

      Wang, W.-H.; Lin, W.-C.; Lim, C.-F.; Smail, I.; Chapman, S.~C.; Zheng, X.~Z.; Shim, H.; Kodama, T.; Almaini, O.; Ao, Y.; Blain, A.~W.; Bourne, N.; Bunker, A.~J.; Chang, Y.-Y.; Chao, D.~C.-Y.; Chen, C.-C.; Clements, D.~L.; Conselice, C.~J.; Cowley, W.~I.; Dannerbauer, H.; Dunlop, J.~S.; Geach, J.~E.; Goto, T.; Jiang, L.; Ivison, R.~J.; Jeong, W.-S.; Kohno, K.; Kong, X.; Lee, C.-H.; Lee, H.~M.; Lee, M.; Michalowski, M.~J.; Oteo, I.; Sawicki, M.; Scott, D.; Shu, X.~W.; Simpson, J.~M.; Tee, W.-L.; Toba, Y.; Valiante, E.; Wang, J.-X.; Wang, R.; Wardlow, J.~L. (2017-11-14)
      The SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) is a three-year JCMT Large Program aiming to reach the 450 μm confusion limit in the COSMOS-CANDELS region to study a representative sample of the high-redshift far-infrared ...

    • The Spatially Resolved Dynamics of Dusty Starburst Galaxies in a z tilde 0.4 Cluster: Beginning the Transition from Spirals to S0s 

      Johnson, H.~L.; Harrison, C.~M.; Swinbank, A.~M.; Bower, R.~G.; Smail, I.; Koyama, Y.; Geach, J.~E. (2016-07-21)
      To investigate what drives the reversal of the morphology–density relation at intermediate/high redshift, we present a multiwavelength analysis of 27 dusty starburst galaxies in the massive cluster Cl 0024+17 at z = 0.4. ...

    • Star formation in quasar hosts and the origin of radio emission in radio-quiet quasars 

      Zakamska, N.~L.; Lampayan, K.; Petric, A.; Dicken, D.; Greene, J.~E.; Heckman, T.~M.; Hickox, R.~C.; Ho, L.~C.; Krolik, J.~H.; Nesvadba, N.~P.~H.; Strauss, M.~A.; Geach, J.~E.; Oguri, M.; Strateva, I.~V. (2016-02-01)
      Radio emission from radio-quiet quasars may be due to star formation in the quasar host galaxy, to a jet launched by the supermassive black hole, or to relativistic particles accelerated in a wide-angle radiatively driven ...