Metallicity of the Intergalactic Medium Using Pixel Statistics. II. The Distribution of Metals as Traced by C IV
- J. Schaye, A. Aguirre, Tae-Sun Kim, T. Theuns, M. Rauch, W. Sargent
- Physics
- 23 June 2003
We measure the distribution of carbon in the intergalactic medium as a function of redshift z and overdensity δ. Using a hydrodynamical simulation to link the H I absorption to the density and…
Intergalactic Dust and Observations of Type Ia Supernovae
- A. Aguirre
- Physics
- 22 April 1999
Estimates of the cosmic star formation rate and of cluster metallicities independently imply that at z ≲ 0.5 the gas in the universe has substantial average metallicity: 1/10 ≲ Z/Z☉ ≲ 1/3 for Ωgas =…
Dimensionless constants, cosmology and other dark matters
- M. Tegmark, A. Aguirre, M. Rees, F. Wilczek
- Physics
- 29 November 2005
We identify 31 dimensionless physical constants required by particle physics and cosmology, and emphasize that both microphysical constraints and selection effects might help elucidate their origin.…
Metal Enrichment of the Intergalactic Medium in Cosmological Simulations
- A. Aguirre, L. Hernquist, J. Schaye, N. Katz, D. Weinberg, J. Gardner
- Physics
- 3 May 2001
Observations have established that the diffuse intergalactic medium (IGM) at z ~ 3 is enriched to ~10-2.5 solar metallicity and that the hot gas in large clusters of galaxies (ICM) is enriched to -…
The missing metals problem – III. How many metals are expelled from galaxies?
- N. Bouché, M. Lehnert, iap
- Physics
- 19 March 2007
We revisit the metal budget at z ≃ 2, and include the contribution of the intergalactic medium (IGM). Past estimates of the metal budget have indicated that, at redshift z ≃ 2.5, 90 per cent of the…
Dust versus Cosmic Acceleration
- A. Aguirre
- Physics
- 19 November 1998
Two groups have recently discovered a statistically significant deviation in the fluxes of high-redshift Type Ia supernovae from the predictions of a Friedmann model with a zero cosmological…
Metal Enrichment of the Intergalactic Medium at z = 3 by Galactic Winds
- A. Aguirre, L. Hernquist, J. Schaye, D. Weinberg, N. Katz, J. Gardner
- Physics
- 24 June 2000
Studies of quasar absorption lines reveal that the low-density intergalactic medium (IGM) at z ~ 3 is enriched to between 10-3 and 10-2 solar metallicity. This enrichment may have occurred in an…
Cosmological Constant or Intergalactic Dust? Constraints from the Cosmic Far-Infrared Background
- A. Aguirre, Z. Haiman
- Physics
- 3 July 1999
Recent observations of Type Ia supernovae (SNe) at redshifts 0 < z < 1 reveal a progressive dimming that has been interpreted as evidence for a cosmological constant of ΩΛ ~ 0.7. An alternative…
Dark matter capture in the first stars: a power source and limit on stellar mass
- K. Freese, D. Spolyar, A. Aguirre
- Physics
- 12 February 2008
The annihilation of weakly interacting massive particles can provide an important heat source for the first (Pop III, ‘Pop’ standing for ‘population’) stars, potentially leading to a new phase of…
THE ORIGIN OF METALS IN THE CIRCUMGALACTIC MEDIUM OF MASSIVE GALAXIES AT z = 3
- S. Shen, P. Madau, A. Aguirre, J. Guedes, L. Mayer, J. Wadsley
- Physics
- 16 September 2011
We present a detailed study of the metal-enriched circumgalactic medium (CGM) of a massive galaxy at z = 3 using results from “ErisMC,” a new cosmological hydrodynamic “zoom-in” simulation of a disk…
...
...