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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant To Appear in the Astronomical Journal
Adam G. Riess,Alexei V. Filippenko,Peter Challis,A. Clocchiatti,Alan H. Diercks,R. L. Gilliland,Craig J. Hogan,Saurabh Jha,Robert P. Kirshner,Bruno Leibundgut,David J Reiss,Brian P. Schmidt,Robert A. Schommer,R. Chris Smith,Jason Spyromilio,Christopher W. Stubbs,Nicholas B. Suntzeff,John L. Tonry +17 more
- 01 Jan 1998
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TL;DR: The spectral and photometric observations of 10 type Ia supernovae (SNe Ia) in the redshift range 0.16 � z � 0.62 were presented in this paper.
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Abstract: 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 et al. 1998) and Riess et al. (1998a), this expanded set of 16 high-redshift supernovae and a set of 34 nearby supernovae are used to place constraints on the following cosmological parameters: the Hubble constant (H0), the mass density (M), the cosmological constant (i.e., the vacuum energy density, �), the deceleration parameter (q0), and the dynamical age of the Universe (t0). The distances of the high-redshift SNe Ia are, on average, 10% to 15% farther than expected in a low mass density (M = 0.2) Universe without a cosmological constant. Different light curve fitting methods, SN Ia subsamples, and prior constraints unanimously favor eternally expanding models with positive cosmological constant (i.e., � > 0) and a current acceleration of the expansion (i.e., q0 < 0). With no prior constraint on mass density other than M � 0, the spectroscopically confirmed SNe Ia are statistically consistent with q0 < 0 at the 2.8�
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V. M. Lipunov
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TL;DR: A unique fast sky survey with all sky observed over a single night down to a limiting magnitude of 19-20 will make it possible to address a number of fundamental problems: search for dark energy via the discovery and photometry of supernovae, search for exoplanets, microlensing effects, discovery of minor bodies in the Solar System, and space-junk monitoring.
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THE WEAK LENSING SIGNAL and the CLUSTERING of BOSS GALAXIES. II. ASTROPHYSICAL and COSMOLOGICAL CONSTRAINTS
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TL;DR: Miyatake et al. as mentioned in this paper performed a joint analysis of the abundance, the clustering, and the galaxy-galaxy lensing signal of galaxies measured from Data Release 11 of the Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey.
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Lunar laser ranging: the millimeter challenge
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Holographic dark-energy models
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UBVRI Photometric Standard Stars in the Magnitude Range 11.5 < V < 16.0 Around the Celestial Equator
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Cosmological imprint of an energy component with general equation of state
TL;DR: In this article, the authors examine the possibility that a significant component of the energy density of the universe has an equation of state different from that of matter, radiation, or cosmological constant.
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The keck low-resolution imaging spectrometer
J. B. Oke,Judith G. Cohen,Michael A. Carr,John Cromer,A. Dingizian,Frederick H. Harris,S. Labrecque,Richard Lucinio,W. A. Schaal,Harland W. Epps,J. Miller +10 more
TL;DR: The Low Resolution Imaging Spectrometer (LRIS) for the Cassegrain focus of the Keck 10-meter telescope on Mauna Kea is described in this paper, which has an imaging mode so it can also be used for taking direct images.
Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications
Saul Perlmutter,Greg Aldering,M. Della Valle,Susana E. Deustua,Richard S. Ellis,Sebastien Fabbro,A. S. Fruchter,G. Goldhaber,A. Goobar,D. E. Groom,I. M. Hook,A. G. Kim,M. Y. Kim,R. A. Knop,C. Lidman,R. G. McMahon,Peter Nugent,R. Pain,Nino Panagia,C. R. Pennypacker,P. Ruiz-Lapuente,B. E. Schaefer,Nicholas A. Walton +22 more
TL;DR: In this paper, the authors reported the discovery of a Type Ia supernova (SN 1997ap) at z = 0.83 at the Keck II 10m telescope.
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