Search Publications
The CFHTLS-Deep Catalog of Interacting Galaxies. I. Merger Rate Evolution to z = 1.2
Sullivan, M.; Bridge, C. R.; Carlberg, R. G.
We present the rest-frame optical galaxy merger fraction between 0.2 < z < 1.2, as a function of stellar mass and optical luminosity, as observed by the Canada-France-Hawaii Telescope Legacy Deep Survey (CFHTLS-Deep). We developed a new classification scheme to identify major galaxy-galaxy mergers based on the presence of tidal tails and bri…
High-resolution CO and radio imaging of ULIRGs: extended CO structures and implications for the universal star formation law
Beswick, R.; Genzel, R.; Ivison, R. J. +14 more
We present high spatial resolution (0.4 arcsec, kpc) Plateau de Bure Interferometer interferometric data on three ultraluminous infrared galaxies (ULIRGs) at : two submillimetre galaxies (SMGs) and one submillimetre faint star-forming radio galaxy. The three galaxies have been robustly detected in CO rotational transitions, either 12CO …
Herschel-ATLAS: Dust temperature and redshift distribution of SPIRE and PACS detected sources using submillimetre colours
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +69 more
We present colour-colour diagrams of detected sources in the Herschel-ATLAS science demonstration field from 100 to 500 µm using both PACS and SPIRE. We fit isothermal modified black bodies to the spectral energy distribution (SED) to extract the dust temperature of sources with counterparts in Galaxy And Mass Assembly (GAMA) or SDSS surveys…
The Atacama Cosmology Telescope (ACT): Beam Profiles and First SZ Cluster Maps
Ade, P. A. R.; Bond, J. R.; Hernández-Monteagudo, C. +69 more
The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz. In this paper, we present ACT's first results. Data have been analyzed using a maximum-likelihood map-making method which uses B-splines to model and remove the atmospheric signal. It has been use…
Chandra observation of two shock fronts in the merging galaxy cluster Abell 2146
Fabian, A. C.; McNamara, B. R.; Russell, H. R. +5 more
We present a new Chandra observation of the galaxy cluster Abell 2146 which has revealed a complex merging system with a gas structure that is remarkably similar to the Bullet cluster. The X-ray image and temperature map show a cool 2 -3 keV subcluster with a ram pressure stripped tail of gas just exiting the disrupted 6 - 7 keV primary cluster. F…
The Most Massive Galaxies at 3.0 <= z < 4.0 in the Newfirm Medium-band Survey: Properties and Improved Constraints on the Stellar Mass Function
van Dokkum, Pieter G.; Franx, Marijn; Illingworth, Garth D. +10 more
We use the optical to mid-infrared coverage of the NEWFIRM Medium-Band Survey (NMBS) to characterize, for the first time, the properties of a mass-complete sample of 14 galaxies at 3.0 <= z < 4.0 with M star>2.5 × 1011 M sun, and to derive significantly more accurate measurements of the high-mass end of th…
Testing Automated Solar Flare Forecasting with 13 Years of Michelson Doppler Imager Magnetograms
Hoeksema, J. T.; Mason, J. P.
Flare occurrence is statistically associated with changes in several characteristics of the line-of-sight magnetic field in solar active regions (ARs). We calculated magnetic measures throughout the disk passage of 1075 ARs spanning solar cycle 23 to find a statistical relationship between the solar magnetic field and flares. This expansive study …
An image of an exoplanet separated by two diffraction beamwidths from a star
Mawet, D.; Serabyn, E.; Burruss, R.
Three exoplanets around the star HR8799 have recently been discovered by means of differential imaging with large telescopes. Bright scattered starlight limits high-contrast imaging to large angular offsets, currently of the order of ten diffraction beamwidths, 10λ/D, of the star (where λ is the wavelength and D is the aperture diameter). Imaging …
The XMM Cluster Survey: Active Galactic Nuclei and Starburst Galaxies in XMMXCS J2215.9-1738 at z = 1.46
Hilton, Matt; Stott, John P.; Stanford, S. Adam +11 more
We use Chandra X-ray and Spitzer infrared (IR) observations to explore the active galactic nucleus (AGN) and starburst populations of XMMXCS J2215.9-1738 at z = 1.46, one of the most distant spectroscopically confirmed galaxy clusters known. The high-resolution X-ray imaging reveals that the cluster emission is contaminated by point sources that w…
Thermal inertia and bolometric Bond albedo values for Mimas, Enceladus, Tethys, Dione, Rhea and Iapetus as derived from Cassini/CIRS measurements
Spencer, J. R.; Howett, C. J. A.; Pearl, J. +1 more
Spectra taken by Cassini's Composite Infrared Spectrometer (CIRS) between 10 and 600 cm -1 (17-1000 µm) of surface thermal emission of Mimas, Enceladus, Tethys, Dione, Rhea and Iapetus have been used to derive the thermal inertia and bolometric Bond albedo values. Only an upper limit for the bolometric Bond albedo of Iapetus' dark…