We have vastly increased the CIV statistics at intermediate redshift by
surveying the thousands of quasars in the Sloan Digital Sky Survey Data-Release
7. We visually verified over 16,000 CIV systems with 1.46 < z < 4.55---a sample
size that renders Poisson error negligible. Detailed Monte Carlo simulations
show we are approximately 50% complete down to rest equivalent widths W_r ~ 0.6
\AA. We analyzed the sample as a whole and in ten small redshift bins with
approximately 1500 doublets each. The equivalent width frequency distributions
f(W_r) were well modeled by an exponential, with little evolution in shape. In
contrast with previous studies that modeled the frequency distribution as a
single power law, the fitted exponential gives a finite mass density for the
CIV ions. The co-moving line density dN_CIV/dX evolved smoothly with redshift,
increasing by a factor of 2.36+/-0.08 from z = 4.55 to 1.96, then plateauing at
dN_CIV/dX ~ 0.34 for z = 1.96 to 1.46. Comparing our SDSS sample with z < 1
(ultraviolet) and z > 5 (infrared) surveys, we see an approximately ten-fold
increase in dN_CIV/dX over z ~ 6 --> 0, for W_r >= 0.6 \AA. This suggests a
monotonic and significant increase in the enrichment of gas outside galaxies
over the 12 Gyr lifetime of the universe.
Описание
[1204.2827] Precious Metals in SDSS Quasar Spectra I: Tracking the Evolution of Strong, 1.5 < z < 4.5 CIV Absorbers with Thousands of Systems
%0 Generic
%1 cooksey2012precious
%A Cooksey, Kathy L.
%A Kao, Melodie M.
%A Simcoe, Robert A.
%A O'Meara, John M.
%A Prochaska, J. Xavier
%D 2012
%K CIV evolution
%T Precious Metals in SDSS Quasar Spectra I: Tracking the Evolution of
Strong, 1.5 < z < 4.5 CIV Absorbers with Thousands of Systems
%U http://arxiv.org/abs/1204.2827
%X We have vastly increased the CIV statistics at intermediate redshift by
surveying the thousands of quasars in the Sloan Digital Sky Survey Data-Release
7. We visually verified over 16,000 CIV systems with 1.46 < z < 4.55---a sample
size that renders Poisson error negligible. Detailed Monte Carlo simulations
show we are approximately 50% complete down to rest equivalent widths W_r ~ 0.6
\AA. We analyzed the sample as a whole and in ten small redshift bins with
approximately 1500 doublets each. The equivalent width frequency distributions
f(W_r) were well modeled by an exponential, with little evolution in shape. In
contrast with previous studies that modeled the frequency distribution as a
single power law, the fitted exponential gives a finite mass density for the
CIV ions. The co-moving line density dN_CIV/dX evolved smoothly with redshift,
increasing by a factor of 2.36+/-0.08 from z = 4.55 to 1.96, then plateauing at
dN_CIV/dX ~ 0.34 for z = 1.96 to 1.46. Comparing our SDSS sample with z < 1
(ultraviolet) and z > 5 (infrared) surveys, we see an approximately ten-fold
increase in dN_CIV/dX over z ~ 6 --> 0, for W_r >= 0.6 \AA. This suggests a
monotonic and significant increase in the enrichment of gas outside galaxies
over the 12 Gyr lifetime of the universe.
@misc{cooksey2012precious,
abstract = {We have vastly increased the CIV statistics at intermediate redshift by
surveying the thousands of quasars in the Sloan Digital Sky Survey Data-Release
7. We visually verified over 16,000 CIV systems with 1.46 < z < 4.55---a sample
size that renders Poisson error negligible. Detailed Monte Carlo simulations
show we are approximately 50% complete down to rest equivalent widths W_r ~ 0.6
\AA. We analyzed the sample as a whole and in ten small redshift bins with
approximately 1500 doublets each. The equivalent width frequency distributions
f(W_r) were well modeled by an exponential, with little evolution in shape. In
contrast with previous studies that modeled the frequency distribution as a
single power law, the fitted exponential gives a finite mass density for the
CIV ions. The co-moving line density dN_CIV/dX evolved smoothly with redshift,
increasing by a factor of 2.36+/-0.08 from z = 4.55 to 1.96, then plateauing at
dN_CIV/dX ~ 0.34 for z = 1.96 to 1.46. Comparing our SDSS sample with z < 1
(ultraviolet) and z > 5 (infrared) surveys, we see an approximately ten-fold
increase in dN_CIV/dX over z ~ 6 --> 0, for W_r >= 0.6 \AA. This suggests a
monotonic and significant increase in the enrichment of gas outside galaxies
over the 12 Gyr lifetime of the universe.},
added-at = {2012-04-16T15:41:52.000+0200},
author = {Cooksey, Kathy L. and Kao, Melodie M. and Simcoe, Robert A. and O'Meara, John M. and Prochaska, J. Xavier},
biburl = {https://www.bibsonomy.org/bibtex/226651fbb396356d8f6104d6ee90aaa09/miki},
description = {[1204.2827] Precious Metals in SDSS Quasar Spectra I: Tracking the Evolution of Strong, 1.5 < z < 4.5 CIV Absorbers with Thousands of Systems},
interhash = {ec710bb94242c842984ea2d7d3a427c9},
intrahash = {26651fbb396356d8f6104d6ee90aaa09},
keywords = {CIV evolution},
note = {cite arxiv:1204.2827Comment: 16.1 pages (emulateapj), 13 figures, 4 tables; submitted to ApJ},
timestamp = {2012-04-16T15:41:52.000+0200},
title = {Precious Metals in SDSS Quasar Spectra I: Tracking the Evolution of
Strong, 1.5 < z < 4.5 CIV Absorbers with Thousands of Systems},
url = {http://arxiv.org/abs/1204.2827},
year = 2012
}