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  • A normal supermassive black hole in NGC 1277 

    Graham, Alister W; Durré, Mark; Savorgnan, Giulia A. D; Medling, Anne M.; Batcheldor, Daniel; Scott, Nicholas; Watson, Beverly; Marconi, Alessandro (2016-03-01)
    The identification of galaxies with “overly massive” black holes requires two measurements: a black hole mass (Mbh) and a host spheroid mass (Msph,*). Here we provideOur new multi-Gaussian expansion (MGE) models and Jeans ...
  • Runaway breakdown in the Jovian atmospheres 

    Dwyer, Joseph R.; Coleman, Lee M.; Lopez, Ramon E.; Saleh, Ziad H.; Concha, D.; Brown, Michael G.; Rassoul, Hamid K. (2006-11-30)
    Using detailed Monte Carlo calculations, the properties of runaway breakdown in the atmospheres of the four gas giant planets in our solar system are investigated, and the runaway avalanche lengths and average runaway ...
  • Quantitative constraints on the transport properties of hot partonic matter from semi-inclusive single high transverse momentum pion suppression in Au+Au collisions at √sNN = 200 GeV 

    Adare, Andrew Marshall; Afanasiev, Sergey V.; Aidala, Christine A.; Ajitanand, N. N.; Akiba, Yasuyuki; Baksay, Gyöngyi; Baksay, László A.; Dehmelt, Klaus; Hohlmann, Marcus; Rembeczki, S. (2008-06-24)
    The PHENIX experiment has measured the suppression of semi-inclusive single high-transverse-momentum π0's in Au+Au collisions at √sNN = 200 GeV. The present understanding of this suppression is in terms of energy loss of ...
  • Photon-hadron jet correlations in p+p and Au+Au collisions at √sNN = 200 GeV 

    Adare, Andrew Marshall; Afanasiev, Sergey V.; Aidala, Christine A.; Ajitanand, N. N.; Akiba, Yasuyuki; Baksay, Gyöngyi; Baksay, László A.; Dehmelt, Klaus; Hohlmann, Marcus; Rembeczki, S. (2009-08-31)
    We report the observation at the Relativistic Heavy Ion Collider of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon ...
  • Wide binary systems and the nature of high-velocity white dwarfs 

    Silvestri, Nicole M.; Oswalt, T. D.; Hawley, Suzanne L. (2002-08)
    We present measured radial velocities and complete space motions for 116 white dwarf stars with M dwarf companions. Thirteen pairs have " halo-like " velocities. According to a recent study by Oppenheimer et al., all these ...
  • A new look at the local white dwarf population 

    Holberg, Jay B.; Sión, Edward M.; Oswalt, T. D.; McCook, George P.; Foran, S.; Subasavage, John P. (2008-04)
    We have conducted a detailed new survey of the local population of white dwarfs lying within 20 pc of the Sun. A new revised catalog of local white dwarfs containing 122 entries (126 individual degenerate stars) is presented. ...
  • The white dwarfs within 20 parsecs of the sun: Kinematics and statistics 

    Sión, Edward M.; Holberg, Jay B.; Oswalt, T. D.; McCook, George P.; Wasatonic, Richard P. (2009-12)
    We present the kinematical properties, distribution of spectroscopic subtypes, and stellar population subcomponents of the white dwarfs within 20 pc of the Sun. We find no convincing evidence of halo white dwarfs in the ...
  • Broadband optical observations of BL lacertae during the 1997 outburst 

    Webb, James R.; Freedman, Ian; Howard, Emily S.; Ma, Feng; Belfort, Michelle; Rave, Heather A.; Rumstay, Ken S.; Oswalt, T. D.; Marshall, Daniel; Robishaw, Timothy (1998-06)
    We present BVRI observations of BL Lacertae during its recent outburst. These observations, made during a 3 month period, cover a significant portion of the optical flare. The reduced data are displayed as light curves and ...
  • The physical properties of double degenerate common proper motion binaries 

    Sión, Edward M.; Oswalt, T. D.; Liebert, James W.; Hintzen, Paul M N (1991-04)
    We present spectral types and spectrophotometry for 21 double degenerate (DD) common proper motion binaries and provide estimates of their colors, absolute visual and bolometric magnitudes, and cooling ages. The most typical ...
  • A far-ultraviolet study of the hot white dwarf in the dwarf nova WW Ceti 

    Godon, P.; Seward, L.; Sion, E.M.; Szkody, P. (2006-05)
    We present a synthetic spectral analysis of IUE archival and FUSE (Far Ultraviolet Spectroscopic Explorer) far-UV spectra of the peculiar dwarf nova WW Cet. During the quiescence of WW Cet, a white dwarf with T wd ∼ 26,000 ...
  • The chromospheric activity and ages of M dwarf stars in wide binary systems 

    Silvestri, Nicole M.; Hawley, Suzanne L.; Oswalt, T. D. (2005-05)
    We investigate the relationship between age and chromospheric activity for 139 M dwarf stars in wide binary systems with white dwarf companions. The age of each system is determined from the cooling age of its white dwarf ...
  • International observational campaigns of the last two eclipses in EE Cephei: 2003 and 2008/9 

    Gałan, Cezary; Mikołajewski, Maciej; Tomov, Toma V.; Graczyk, Dariusz; Apostolovska, Gordana; Barzova, Ina S.; Bellas-Velidis, Ioannis; Bilkina, B. I.; Blake, Rick Melvin; Németh, Péter (2012-07-27)
    Context. EE Cep is an unusual long-period (5.6 yr) eclipsing binary discovered during the mid-twentieth century. It undergoes almost-grey eclipses that vary in terms of both depth and duration at different epochs. The ...
  • AGILE detection of Cygnus X-3 γ-ray active states during the period mid-2009/mid-2010 

    Bulgarelli, A.; Tavani, Marco; Chen, Andrew; Evangelista, Yuri; Trifoglio, Massimo; Gianotti, Fulvio; Piano, Giovanni; Sabatini, Sabina; Striani, Edoardo; Hannikainen, Diana Carina (2012-02)
    Context. Cygnus X-3 (Cyg X-3) is a well-known microquasar producing variable emission at all wavelengths. Cyg X-3 is a prominent X-ray binary producing relativistic jets, and studying its high energy emission is crucial ...
  • Science of Active Galactic Nuclei with the GTC and CanariCam 

    Levenson, Nancy A.; Packham, Christopher C.; Alonso-Herrero, Almudena; Aretxaga, Itziar; Colina, Luis; Santos, Tanio Díaz; Elitzur, Moshe; Mason, Rachel E.; Perlman, Eric S.; Radomski, James T. (2008-07-09)
    CanariCam is the facility mid-infrared (MIR) instrument for the Gran Telescopio Canarias (GTC), a 10.4m telescope at the Observatorio del Roque de los Muchachos on La Palma. One of the science drivers for CanariCam is the ...
  • Four short-period algols 

    Rafert, James Bruce (1990-10)
    We have analyzed the light curves of four close binary star systems (BV 267, RU UMi, XZ CMi, and VV UMa) using the Wilson-Devinney differential corrections model. The present system geometries of these binaries is that of ...
  • UV observations of the cool DBQA5 white dwarf LDS 678A: Limits on the atmospheric composition, pressure shift, and gravitational redshift derived from C I 2479 

    Oswalt, T. D.; Sión, Edward M.; Hammond, Gordon L.; Vauclair, Gérard P.; Liebert, James W.; Wegner, Gary A.; Koester, Detlev; Marcum, Pamela M. (1991-02)
    We present a high-resolution ultraviolet spectrum of the helium-rich degenerate LDS 678A, obtained with the International Ultraviolet Explorer (IUE) satellite. LDS 678A is the coolest metallic line degenerate (DQ or DZ) ...
  • Hubble space telescope observations of cool white dwarf stars: Detection of new species of heavy elements 

    Shipman, Harry L.; Barnhill, Maurice; Provençal, Judith L.; Roby, Scott W.; Bues, Irmela; Córdova, France A.; Hammond, Gordon L.; Hintzen, Paul M N; Koester, Detlev; Oswalt, T. D. (1995-03)
    Observations of cool white dwarf stars with the Hubble Space Telescope has uncovered a number of spectral features from previously unobserved species. In this paper we present the data on four cool white dwarfs. We present ...
  • White dwarfs in common proper motion binary systems: Mass distribution and kinematics 

    Silvestri, Nicole M.; Oswalt, T. D.; Wood, Matt A.; Smith, Jonathan Allyn; Reid, Iain Neill; Sión, Edward M. (2001-01)
    We present the mass distribution, gravitational redshifts, radial velocities, and space motions of white dwarf stars in common proper motion binary systems. The mass distribution we derive for the 41 DA white dwarfs in ...
  • Multiband microvariability observations of BL lacertae during the outburst of 1997 

    Clements, Sandra D.; Carini, Michael T. (2001-01)
    BL Lac was observed in the V and R bands on 11 nights in 1997 July during a major optical outburst. It varied continuously, exhibiting nightly variations ranging from 0.1 to 0.6 mag. Over the course of the 11 nights, BL ...
  • A DYNAMICAL ANALYSIS of the KEPLER-80 SYSTEM of FIVE TRANSITING PLANETS 

    Macdonald, Mariah G.; Ragozzine, Darin A.; Fabrycky, Daniel C.; Ford, Eric B.; Holman, Matthew J.; Isaacson, Howard T.; Lissauer, Jack Jonathan; Lopez, Eric D.; Mazeh, Tsevi; Rogers, Leslie A. (2016-10)
    Kepler has discovered hundreds of systems with multiple transiting exoplanets which hold tremendous potential both individually and collectively for understanding the formation and evolution of planetary systems. Many of ...

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