Physics & Atmospheric Science Faculty Research, Publications and Presentations: Recent submissions

Now showing items 201-220 of 532

  • Slicing The Monoceros Overdensity with Suprime-Cam 

    Conn, Blair C., Noelia E. D. Noël, Hans-Walter Rix, R. R. Lane, et al. 2012. "Slicing The Monoceros Overdensity with Suprime-Cam." The Astrophysical Journal 754:101.
    We derive distance, density and metallicity distribution of the stellar Monoceros Overdensity (MO) in the outer Milky Way, based on deep imaging with the Subaru Telescope. We applied CMD fitting techniques in three stripes ...

  • The M33 Globular Cluster System with PAndAS Data: The Last Outer Halo Cluster? 

    Cockcroft, Robert, William E. Harris, Annette M. N. Ferguson, Avon Huxor, et al. 2011. "The M33 Globular Cluster System with PAndAS Data: The Last Outer Halo Cluster?." The Astrophysical Journal 730: 112.
    We use CFHT/MegaCam data to search for outer halo star clusters in M33 as part of the Pan-Andromeda Archaeological Survey (PAndAS). This work extends previous studies out to a projected radius of 50 kpc and covers over 40 ...

  • Unearthing Foundations of a Cosmic Cathedral: Searching the Stars for M33's Halo 

    Cockcroft, Robert, Alan W. McConnachie, William E. Harris, Rodrigo Ibata, et al. 2012. "Unearthing Foundations of a Cosmic Cathedral: Searching the Stars for M33's Halo." 428(2): 1248-1262
    We use data from the Pan-Andromeda Archaeological Survey (PAndAS) to search for evidence of an extended halo component belonging to M33 (the Triangulum Galaxy). We identify a population of red giant branch (RGB) stars at ...

  • 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 ...

  • Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 

    Aravena, M., E. J. Murphy, J. E. Aguirre, M. L. N. Ashby, et al. 2013. "Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7." Monthly Notices of the Royal Astronomical Society 433(1):498
    We report the detection of CO(1-0) line emission in the bright, lensed star-forming galaxies SPT-S 233227-5358.5 (z=2.73) and SPT-S 053816-5030.8 (z=2.78), using the Australia Telescope Compact Array (ATCA). Both galaxies ...

  • HerMES: Clusters of Dusty Galaxies Uncovered by Herschel and Planck 

    Clements, D. L., F. G. Braglia, A. Hyde, I. Perez-Fournon, et al. 2014. "HerMES: Clusters of Dusty Galaxies Uncovered by Herschel and Planck." Monthly Notices of the Royal Astronomical Society 439 (2): 1193
    The potential for Planck to detect clusters of dusty, star-forming galaxies at z greater than 1 is tested by examining the Herschel-SPIRE images of Planck Early Release Compact Source Catalog (ERCSC) sources lying in fields ...

  • A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo 

    Collins, M. L. M., S. C. Chapman, M. Irwin, R. Ibata, et al. 2009. "A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo." Monthly Notices of the Royal Astronomical Society 396: 1619.
    We present a spectroscopic survey of candidate red giant branch stars in the extended star cluster, EC4, discovered in the halo of M31 from our CFHT/MegaCam survey, overlapping the tidal streams, Stream Cp and Stream Cr. ...

  • The kinematic identification of a thick stellar disc in M31 

    Collins, M. L. M., S. C. Chapman, R. A. Ibata, M. J. Irwin, et al. 2010. "The kinematic identification of a thick stellar disc in M31." Monthly Notices of the Royal Astronomical Society 413:1548.
    We present the first characterization of a thick disc component in the Andromeda galaxy (M31) using kinematic data from the DEIMOS multi-object spectrograph instrument on Keck II. Using 21 fields in the South West of the ...

  • Extracting Source Parameters from Gaussian Fits to Two-Particle Correlations 

    Chapman, Scott, J. Rayford Nix, and Ulrich Heinz. 1995. "Extracting Source Parameters from Gaussian Fits to Two-Particle Correlations." 52(5): 2694-2703
    Using a quadratic saddle-point approximation, we show how information about a particle-emitting source can be extracted from gaussian fits to two-particle correlation data. Although the formalism is completely general, ...

  • Deep observations of CO line emission from star-forming galaxies in a cluster candidate at z=1.5 

    Aravena, M., C. L. Carilli, M. Salvato, M. Tanaka, et al. 2012. "Deep observations of CO line emission from star-forming galaxies in a cluster candidate at z=1.5." Monthly Notices of the Royal Astronomical Society 426: 258.
    We report results from a deep Jansky Very Large Array (JVLA) search for CO 1-0 line emission from galaxies in a candidate galaxy cluster at z~1.55 in the COSMOS field. We target 4 galaxies with optical spectroscopic redshifts ...

  • Ultra Steep Spectrum radio sources in the Lockman Hole: SERVS identifications and redshift distribution at the faintest radio fluxes 

    Afonso, J., L. Bizzocchi, E. Ibar, M. Grossi, et al. 2011. "Ultra Steep Spectrum radio sources in the Lockman Hole: SERVS identifications and redshift distribution at the faintest radio fluxes." The Astrophysical Journal 743:122.
    Ultra Steep Spectrum (USS) radio sources have been successfully used to select powerful radio sources at high redshifts (z>~2). Typically restricted to large-sky surveys and relatively bright radio flux densities, it has ...

  • Particle formation and growth at five rural and urban sites 

    Jeong, C-H, G. J. Evans, M. L. McGuire, R. Y-W Chang, et al. 2010. "Particle formation and growth at five rural and urban sites." Atmospheric Chemistry and Physics 10(16): 7979-7995.
    Ultrafine particle (UFP) number and size distributions were simultaneously measured at five urban and rural sites during the summer of 2007 in Ontario, Canada as part of the Border Air Quality and Meteorology Study ...

  • Elucidating determinants of aerosol composition through particle-type-based receptor modeling 

    McGuire, M. L., C. -H Jeong, J. G. Slowik, R. Y. -W Chang, et al. 2011. "Elucidating determinants of aerosol composition through particle-type-based receptor modeling." Atmospheric Chemistry and Physics 11(15): 8133-8155.
    An aerosol time-of-flight mass spectrometer (ATOFMS) was deployed at a semi-rural site in southern Ontario to characterize the size and chemical composition of individual particles. Particle-type-based receptor modelling ...

  • Characterization of a large biogenic secondary organic aerosol event from eastern Canadian forests 

    Slowik, J. G., C. Stroud, J. W. Bottenheim, P. C. Brickell, et al. 2010. "Characterization of a large biogenic secondary organic aerosol event from eastern Canadian forests." Atmospheric Chemistry and Physics 10(6): 2825-2845.
    Measurements of aerosol composition, volatile organic compounds, and CO are used to determine biogenic secondary organic aerosol (SOA) concentrations at a rural site 70 km north of Toronto. These biogenic SOA levels ...

  • Aerosol composition and sources in the central Arctic Ocean during ASCOS 

    Chang, R. Y. -W, C. Leck, M. Graus, M. Mueller, et al. 2011. "Aerosol composition and sources in the central Arctic Ocean during ASCOS." Atmospheric Chemistry and Physics 11(20): 10619-10636.
    Measurements of submicron aerosol chemical composition were made over the central Arctic Ocean from 5 August to 8 September 2008 as a part of the Arctic Summer Cloud Ocean Study (ASCOS) using an aerosol mass spectrometer ...

  • The hygroscopicity parameter (kappa) of ambient organic aerosol at a field site subject to biogenic and anthropogenic influences: relationship to degree of aerosol oxidation 

    Chang, R. Y-W, J. G. Slowik, N. C. Shantz, A. Vlasenko, et al. 2010. "The hygroscopicity parameter (kappa) of ambient organic aerosol at a field site subject to biogenic and anthropogenic influences: relationship to degree of aerosol oxidation." Atmospheric Chemistry and Physics 10(11): 5047-5064.
    Cloud condensation nuclei (CCN) concentrations were measured at Egbert, a rural site in Ontario, Canada during the spring of 2007. The CCN concentrations were compared to values predicted from the aerosol chemical ...

  • Photochemical processing of organic aerosol at nearby continental sites: contrast between urban plumes and regional aerosol 

    Slowik, J. G., J. Brook, R. Y-W Chang, G. J. Evans, et al. 2011. "Photochemical processing of organic aerosol at nearby continental sites: contrast between urban plumes and regional aerosol." Atmospheric Chemistry and Physics 11(6): 2991-3006.
    As part of the BAQS-Met 2007 field campaign, Aerodyne time-of-flight aerosol mass spectrometers (ToF-AMS) were deployed at two sites in southwestern Ontario from 17 June to 11 July 2007. One instrument was located at ...

  • Diurnally resolved particulate and VOC measurements at a rural site: indication of significant biogenic secondary organic aerosol formation 

    Sjostedt, S. J., J. G. Slowik, J. R. Brook, R. Y. -W Chang, et al. 2011. "Diurnally resolved particulate and VOC measurements at a rural site: indication of significant biogenic secondary organic aerosol formation." Atmospheric Chemistry and Physics 11(12): 5745-5760.
    We report simultaneous measurements of volatile organic compound (VOC) mixing ratios including C-6 to C-8 aromatics, isoprene, monoterpenes, acetone and organic aerosol mass loadings at a rural location in southwestern ...

  • Slower CCN growth kinetics of anthropogenic aerosol compared to biogenic aerosol observed at a rural site 

    Shantz, N. C., R. Y. -W Chang, J. G. Slowik, A. Vlasenko, et al. 2010. "Slower CCN growth kinetics of anthropogenic aerosol compared to biogenic aerosol observed at a rural site." Atmospheric Chemistry and Physics 10(1): 299-312.
    Growth rates of water droplets were measured with a static diffusion cloud condensation chamber in May-June 2007 at a rural field site in Southern Ontario, Canada, 70 km north of Toronto. The observations include periods ...

  • The effect of meteorological and chemical factors on the agreement between observations and predictions of fine aerosol composition in southwestern Ontario during BAQS-Met 

    Markovic, M. Z., K. L. Hayden, J. G. Murphy, P. A. Makar, et al. 2011. "The effect of meteorological and chemical factors on the agreement between observations and predictions of fine aerosol composition in southwestern Ontario during BAQS-Met." Atmospheric Chemistry and Physics 11(7): 3195-3210.
    The Border Air Quality and Meteorology Study (BAQS-Met) was an intensive, collaborative field campaign during the summer of 2007 that investigated the effects of transboundary pollution, local pollution, and local ...