Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Physical Sciences and Mathematics
Toward A Precise Measurement Of Matter Clustering: Ly Alpha Forest Data At Redshifts 2-4, Rac Croft, Dh Weinberg, M Bolte, S Burles, L Hernquist, N Katz, D Kirkman, D Tytler
Toward A Precise Measurement Of Matter Clustering: Ly Alpha Forest Data At Redshifts 2-4, Rac Croft, Dh Weinberg, M Bolte, S Burles, L Hernquist, N Katz, D Kirkman, D Tytler
Astronomy Department Faculty Publication Series
We measure the filling factor, correlation function, and power spectrum of transmitted flux in a large sample of Lyα forest spectra, comprised of 30 Keck HIRES spectra and 23 Keck LRIS spectra. We infer the linear matter power spectrum P(k) from the flux power spectrum PF(k), using an improved version of the method of Croft et al. that accounts for the influence of redshift-space distortions, nonlinearity, and thermal broadening on the shape of PF(k). The evolution of the shape and amplitude of P(k) over the redshift …
X-Ray Scaling Relations Of Galaxy Groups In A Hydrodynamic Cosmological Simulation, R Dave, N Katz, Dh Weinberg
X-Ray Scaling Relations Of Galaxy Groups In A Hydrodynamic Cosmological Simulation, R Dave, N Katz, Dh Weinberg
Astronomy Department Faculty Publication Series
We examine the scalings of X-ray luminosity, temperature, and dark matter or galaxy velocity dispersion for galaxy groups in a ΛCDM cosmological simulation, which incorporates gravity, gas dynamics, radiative cooling, and star formation, but no substantial nongravitational heating. In agreement with observations, the simulated LX-σ and LX-TX relations are steeper than those predicted by adiabatic simulations or self-similar models, with LX σ4.4 and LX T for massive groups and significantly steeper relations below a break at σ 180 km s-1 (TX 0.7 keV). The TX-σ relation …