Browsing Chapman, Scott by Submit Date

Now showing items 61-80 of 211

  • The Discovery of Remote Globular Clusters in M33 

    Huxor, A., A. M. N. Ferguson, M. K. Barker, N. R. Tanvir, et al. 2009. "The Discovery of Remote Globular Clusters in M33." The Astrophysical Journal Letters, 698(2): 77-L81
    We present the discovery of four remote star clusters in M33, one of which is of an extended nature. Three of the clusters were discovered using survey data from the Isaac Newton Telescope Wide-Field Camera while one was ...

  • The globular cluster NGC 2419: a crucible for theories of gravity 

    Ibata, R., A. Sollima, C. Nipoti, M. Bellazzini, et al. 2011. "The globular cluster NGC 2419: a crucible for theories of gravity." The Astrophysical Journal 738:186.
    We present the analysis of a kinematic data set of stars in the globular cluster NGC 2419, taken with Keck/DEIMOS. Combined with a reanalysis of deep HST and Subaru imaging data, which provide an accurate luminosity profile ...

  • The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation 

    Bellazzini, M., R. A. Ibata, S. C. Chapman, A. D. Mackey, et al. 2008. "The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation." The Astronomical Journal 136(3): 1147-1170
    We present the results of a thorough study of the nucleus of the Sgr dwarf spheroidal galaxy and of the bright globular cluster M54 that resides within the same nucleus (Sgr,N). We have obtained accurate radial velocities ...

  • On the accretion origin of a vast extended stellar disk around the Andromeda galaxy 

    Ibata, R., S. Chapman, A. M. N. Ferguson, G. Lewis, et al. 2005. "On the accretion origin of a vast extended stellar disk around the Andromeda galaxy." The Astrophysical Journal 634(1): 287-313
    We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2800 stars with the Keck/DEIMOS spectrograph. ...

  • A robust sample of submillimetre galaxies: constraints on the prevalence of dusty, high-redshift starbursts 

    Ivison, R. J., Ian Smail, J. S. Dunlop, T. R. Greve, et al. 2005. "A robust sample of submillimetre galaxies: constraints on the prevalence of dusty, high-redshift starbursts." Monthly Notices of the Royal Astronomical Society 364(3): 1025-1040
    The modest significance of most sources detected in current submm surveys can potentially compromise some analyses due to the inclusion of spurious sources in catalogues typically selected at >3.0-3.5sigma. Here, we develop ...

  • Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA 

    Ivison, R. J., P. P. Papadopoulos, Ian Smail, T. R. Greve, et al. 2010. "Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA." Monthly Notices of the Royal Astronomical Society 412:1913.
    We report the results of a pilot study with the EVLA of 12CO J=1-0 emission from four SMGs at z=2.2-2.5, each with an existing detection of CO J=3-2. Using the EVLA's most compact configuration we detect strong, broad J=1-0 ...

  • Do globular clusters possess Dark Matter halos? A case study in NGC 2419 

    Ibata, Rodrigo, Carlo Nipoti, Antonio Sollima, Michele Bellazzini, et al. 2012. "Do globular clusters possess Dark Matter halos? A case study in NGC 2419." Monthly Notices of the Royal Astronomical Society 428(4):3648.
    We use recently published measurements of the kinematics, surface brightness and stellar mass-to-light ratio of the globular cluster NGC 2419 to examine the possibility that this Galactic halo satellite is embedded in a ...

  • AEGIS20: a radio survey of the Extended Groth Strip 

    Ivison, R. J., S. C. Chapman, S. M. Faber, Ian Smail, et al. 2007. "AEGIS20: a radio survey of the Extended Groth Strip." The Astrophysical Journal 660(1): 77-L80
    We describe AEGIS20 - a radio survey of the Extended Groth Strip (EGS) conducted with the Very Large Array (VLA) at 1.4GHz. The resulting catalog contains 1,123 emitters and is sensitive to ultraluminous starbursts to z1 ...

  • Kinematic and Chemical constraints on the formation of M31's inner and outer halo 

    Koch, A., R. M. Rich, D. B. Reitzel, N. F. Martin, et al. 2007. "Kinematic and Chemical constraints on the formation of M31's inner and outer halo." The Astrophysical Journal 689 (2):958
    The halo of M31 shows a wealth of substructures that are consistent with satellite accretion. Here we report on kinematic and abundance results from Keck/DEIMOS spectroscopy in the calcium triplet region of over 3500 red ...

  • SHARC-2 350 Micron Observations of Distant Submillimeter Selected Galaxies 

    Kovacs, A., S. C. Chapman, C. D. Dowell, A. W. Blain, et al. 2006. "SHARC-2 350 Micron Observations of Distant Submillimeter Selected Galaxies." The Astrophysical Journal 650(2): 592-603
    We present 350 micron observations of 15 Chapman et al. submillimeter galaxies (SMGs) with radio counterparts and optical redshifts. We detect 12 and obtain sensitive upper limits for three, providing direct, precise ...

  • Rest-frame optical and far-infrared observations of extremely bright Lyman-break galaxy candidates at z ~ 2.5 

    Ivison, Rob, Ian Smail, Misty Bentz, Jason Stevens, et al. 2005. "Rest-frame optical and far-infrared observations of extremely bright Lyman-break galaxy candidates at z ~ 2.5." Monthly Notices of the Royal Astronomical Society 362(2): 535-541
    We have investigated the rest-frame optical and far-infrared properties of a sample of extremely bright candidate Lyman-break galaxies (LBG) identified in the Sloan Digital Sky Survey. Their high ultraviolet luminosities ...

  • An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts 

    Karim, Alexander, Mark Swinbank, Jackie Hodge, Ian Smail, et al. 2013. "An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts." 432(1): 2-9
    We report the first counts of faint submillimetre galaxies (SMG) in the 870-um band derived from arcsecond resolution observations with the Atacama Large Millimeter Array (ALMA). We have used ALMA to map a sample of 122 ...

  • Obscured and unobscured active galactic nuclei in the Spitzer Space Telescope First Look Survey 

    Lacy, M., L. J. Storrie-Lombardi, A. Sajina, P. N. Appleton, et al. 2004. "Obscured and unobscured active galactic nuclei in the Spitzer Space Telescope First Look Survey." The Astrophysical Journal 154(1): 166-169
    Selection of active galactic nuclei (AGN) in the infrared allows the discovery of AGN whose optical emission is extinguished by dust. In this paper, we use the Spitzer Space Telescope First Look Survey (FLS) to assess what ...

  • The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies 

    Ivison, R. J., T. R. Greve, J. S. Dunlop, J. A. Peacock, et al. 2007. "The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies." Monthly Notices of the Royal Astronomical Society 380(1): 199-228
    Determining an accurate position for a submm galaxy (SMG) is the crucial step that enables us to move from the basic properties of an SMG sample - source counts and 2-D clustering - to an assessment of their detailed, ...

  • The large-scale structure of the halo of the Andromeda Galaxy Part I: global stellar density, morphology and metallicity properties 

    Ibata, Rodrigo A., Geraint F. Lewis, Alan W. McConnachie, Nicolas F. Martin, et al. 2013. "The large-scale structure of the halo of the Andromeda Galaxy Part I: global stellar density, morphology and metallicity properties." The Astrophysical Journal780(2):128
    We present an analysis of the large-scale structure of the halo of the Andromeda galaxy, based on the Pan-Andromeda Archeological Survey (PAndAS), currently the most complete map of resolved stellar populations in any ...

  • The Star Formation History and Dust Content in the Far Outer Disc of M31 

    Bernard, Edouard J., Annette M. N. Ferguson, Michael K. Barker, Sebastian L. Hidalgo, et al. 2011. "The Star Formation History and Dust Content in the Far Outer Disc of M31." Monthly Notices of the Royal Astronomical Society 420: 2625.
    We present a detailed analysis of two fields located 26 kpc (~5 scalelengths) from the centre of M31. One field samples the major axis populations--the Outer Disc field--while the other is offset by ~18' and samples the ...

  • The disappearance of Lyα blobs: a GALEX search at z=0.8 

    Keel, William C., Raymond E. White III., Scott Chapman, and Rogier A. Windhorst. 2009. "The disappearance of Lyα blobs: a GALEX search at z=0.8." Astronomical Journal 138(3):986.
    Lyman alpha blobs - luminous, spatially extended emission-line nebulae, often lacking bright continuum counterparts - are common in dense environments at high redshift. Until recently, atmospheric absorption and filter ...

  • Polytropic model fits to the globular cluster NGC 2419 in Modified Newtonian Dynamics 

    Ibata, Rodrigo, Antonio Sollima, Carlo Nipoti, Michele Bellazzini, et al. 2011. "Polytropic model fits to the globular cluster NGC 2419 in Modified Newtonian Dynamics." The Astrophysical Journal 743:43.
    We present an analysis of the globular cluster NGC 2419, using a polytropic model in Modified Newtonian Dynamics (MOND) to reproduce recently published high quality data of the structure and kinematics of the system. We ...

  • Using [CI] to probe the Interstellar Medium in z~2.5 Sub-Millimeter Galaxies 

    Alaghband-Zadeh, S., S. C. Chapman, A. M. Swinbank, Ian Smail, et al. 2013. "Using [CI] to probe the Interstellar Medium in z~2.5 Sub-Millimeter Galaxies." Monthly Notices of the Royal Astronomical Society 435(2):1493
    We present new [CI](1-0) and 12CO(4-3) Plateau de Bure Interferometer observations of five Sub-Millimeter Galaxies (SMGs) and combine these with all available [CI](1-0) literature detections in SMGs to probe the gas ...

  • Evidence for an accretion origin for the outer halo globular cluster system of M31 

    Mackey, Dougal, Avon Huxor, Annette Ferguson, Mike Irwin, et al. 2010. "Evidence for an accretion origin for the outer halo globular cluster system of M31." The Astrophysical Journal Letters 717(1): L11.
    We use a sample of newly-discovered globular clusters from the Pan-Andromeda Archaeological Survey (PAndAS) in combination with previously-catalogued objects to map the spatial distribution of globular clusters in the M31 ...