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8 papers · 2 filters
CMB Anisotropy Constraints on Flat-Lambda and Open CDM Cosmogonies from DMR, UCSB South Pole, Python, ARGO, MAX, White Dish, OVRO, and SuZIE Data
Pia Mukherjee, Ken Ganga, Bharat Ratra +4
We use joint likelihood analyses of combinations of fifteen cosmic microwave background (CMB) anisotropy data sets from the DMR, UCSB South Pole 1994, Python I--III, ARGO, MAX 4 an…
OVRO CMB Anisotropy Measurement Constraints on Flat-Lambda and Open CDM Cosmogonies
Pia Mukherjee, Tarun Souradeep, Bharat Ratra +2
We use Owens Valley Radio Observatory (OVRO) cosmic microwave background (CMB) anisotropy data to constrain cosmological parameters. We account for the OVRO beamwidth and calibrati…
The TeV spectrum of H1426+428
D. Petry, I. H. Bond, S. M. Bradbury +45
The BL Lac object H1426+428 was recently detected as a high energy gamma-ray source by the VERITAS collaboration (Horan et al. 2002). We have reanalyzed the 2001 portion of the dat…
Discovery of Spectral Variability of Markarian 421 at TeV Energies
F. Krennrich, I. H. Bond, S. M. Bradbury +38
The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2…
The Cosmological Constant and Dark Energy
P. J. E. Peebles, Bharat Ratra
Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, Lambda; nowadays the concept is termed dark en…
Radio Galaxy Redshift-Angular Size Data Constraints on Dark Energy
Silviu Podariu, Ruth A. Daly, Matthew P. Mory +1
We use FRIIb radio galaxy redshift-angular size data to constrain cosmological parameters in a dark energy scalar field model. The derived constraints are consistent with but weake…