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111 papers · 2 filters
Structure of the X-ray Emission from the Jet of 3C 273
H. L. Marshall, D. E. Harris, J. P. Grimes +12
We present images from five observations of the quasar 3C 273 with the Chandra X-ray Observatory. The jet has at least four distinct features which are not resolved in previous obs…
Global Constraints On Key Cosmological Parameters
G. Steigman, T. P. Walker, A. Zentner
Data from Type Ia supernovae, along with X-ray cluster estimates of the universal baryon fraction and Big Bang Nucleosynthesis (BBN) determinations of the baryon-to-photon ratio, a…
Towards a Precise Measurement of Matter Clustering: Lyman-alpha Forest Data at Redshifts 2-4
Rupert A. C. Croft, David H. Weinberg, Mike Bolte +5
We measure the filling factor, correlation function, and power spectrum of transmitted flux in a large sample of Lya forest spectra, comprised of 30 Keck HIRES spectra and 23 Keck…
The Luminosity Function of Galaxies in SDSS Commissioning Data
SDSS Collaboration, M. R. Blanton
During commissioning observations, the Sloan Digital Sky Survey (SDSS) has produced one of the largest existing galaxy redshift samples selected from CCD images. Using 11,275 galax…
The Helium abundance problem and non-minimally coupled quintessence
Xuelei Chen
There is a tension between observed Helium abundance and the prediction of the standard Big Bang Nucleosynthesis. We show that non-minimally quintessence model may help to reduce t…
How to get less helium and more neutrinos from BBN
Xuelei Chen
We discuss BBN in the presence of a non-minimally coupled quintessence model. In some of these models, the gravitational constant and cosmic expansion rate are smaller than standar…