R Chris Smith

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We have measured the rest-frame B, V, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z = 0.46), using HST and ground-based near-infrared detectors. A goal of this study is the measurement of the color excess, E B−I , which is a sensitive indicator of interstellar or intergalactic dust which could affect recent cosmological(More)
  • Parviz Ghavamian, John Raymond, R Chris Smith, Patrick Hartigan
  • 2000
We present an observational and theoretical study of the optical emission from nonradiative shocks in three supernova remnants: the Cygnus Loop, RCW 86 and Tycho. The spectra of these shocks are dominated by collisionally excited hydrogen Balmer lines which have both a broad component caused by proton-neutral charge exchange and a narrow component caused by(More)
The High-Z Supernova Search is an international collaboration to discover and monitor type Ia supernovae (SN Ia) at z > 0.2 with the aim of measuring cosmic deceleration and global curvature. Our collaboration has pursued a basic understanding of supernovae in the nearby Universe, discovering and observing a large sample of objects, and developing methods(More)
We have coordinated Hubble Space Telescope photometry with ground-based discovery for three supernovae: two SN Ia near z ∼ 0.5 (SN 1997ce, SN 1997cj) and a third event at z = 0.97 (SN 1997ck). The superb spatial resolution of HST separates each supernova from its host galaxy and leads to good precision in the light curves. The HST data combined with(More)
  • Kazimierz J Borkowski, Brian J Williams, Stephen P Reynolds, William P Blair, Parviz Ghavamian, Ravi Sankrit +4 others
  • 2006
We present first results from an extensive survey of Magellanic Clouds super-nova remnants (SNRs) with the Spitzer Space Telescope. None was detected in the four short-wavelength IRAC bands, but all four were clearly imaged at 24 µm, and two at 70 µm. A comparison of these images to Chandra broadband X-ray images shows a clear association with the blast(More)
We report results from high resolution optical spectroscopy of three non-radiative galactic supernova remnants, RCW 86, Kepler's supernova remnant and SN 1006. We have measured the narrow component Hα line widths in Balmer-dominated filaments in RCW 86 and SN 1006, as well as the narrow component width in a Balmer-dominated knot in Kepler's SNR. The narrow(More)
  • Yaël Nazé, You-Hua Chu, Martín A Guerrero, M S Oey, Robert A Gruendl, R Chris Smith
  • 2002
Dynamical studies of superbubbles and Wolf-Rayet ring nebulae show discrepancies from the standard, adiabatic model for wind-blown bubbles. We therefore study the physical properties and kinematics of three candidate bubbles blown by single O stars, to evaluate whether these discrepancies are also found in these simpler objects. Our sample candidates are(More)
  • Rosa Murphy Williams, You-Hua Chu, John R Dickel, R Chris Smith, Maritza Tavarez
  • 1999
We have used archival ROSAT data to present X-ray images of thirty-one supernova remnants (SNRs) in the Large Magellanic Cloud (LMC). We have classified these remnants according to their X-ray morphologies, into the categories of Shell-Type, Diffuse Face, Centrally Brightened, Point-Source Dominated, and Irregular. We suggest possible causes of the X-ray(More)
We present spectral and photometric observations of 10 type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z ≤ 0.62. The luminosity distances of these objects are determined by methods that employ relations between SN Ia luminosity and light curve shape. Combined with previous data from our High-Z Supernova Search Team (Garnavich et al. 1998; Schmidt(More)
The large H ii complex N11 in the Large Magellanic Cloud contains OB associations at several different stages in their life histories. We have obtained ROSAT PSPC and HRI X-ray observations, Curtis Schmidt CCD images, echelle spectra in Hα and [N II] lines, and IUE interstellar absorption line observations of this region. The central bubble of N11 has an(More)