Average Extinction Curves and Abundances at 1<z<2 from MgII Absorption Systems

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

We present average extinction curves and relative abundance measurements for a sample of 809 MgII absorption line systems, with 1.0 < zabs < 1.86, identified in the spectra of SDSS quasars. Extinction curves for numerous sub-samples were generated by comparing geometric mean absorber-frame spectra with those of matching quasar spectra without absorbers. There is clear evidence for the presence of dust in the intervening systems. All of the extinction curves are similar to the SMC extinction curve, and the 2175{Å} absorption feature is not detectable in the curves of any of the sub-samples. Quasars with absorbers are at least three times as likely to have highly reddened spectra, compared to quasars without detected absorption systems. The average absorber-frame color excess, E(B-V), ranges from <0.001 to 0.085, and depends on the properties of the absorbers in the sub-samples. The column densities of numerous first ions do not show as correspondingly large a variation as the color excess. The depletion pattern in the high E(B-V) samples is similar to that of Galactic halo clouds, and is consistent with those found for individual damped Ly α systems.
Funding for the Sloan Digital Sky Survey (SDSS) has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the U.S. Department of Energy, the Japanese Monbukagakusho, the Max Planck Society, and the HEFCE.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Average Extinction Curves and Abundances at 1<z<2 from MgII Absorption Systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Average Extinction Curves and Abundances at 1<z<2 from MgII Absorption Systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Average Extinction Curves and Abundances at 1<z<2 from MgII Absorption Systems will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1284868

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.