Asset Details
Do you wish to reserve the book?
Metals, depletion and dimming: decrypting dust
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Metals, depletion and dimming: decrypting dust
Do you wish to request the book?
Metals, depletion and dimming: decrypting dust
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Paper
Metals, depletion and dimming: decrypting dust
2018
Overview
Dust plays a pivotal role in the chemical enrichment of the interstellar medium. In the era of mid/high resolution spectra and multi-band spectral energy distributions, testing extinctions against gas and dust-phase properties is becoming possible. In order to test relations between metals, dust and depletions, and comparing those to the Local Group (LG) relations, we build a sample of 93 gamma-ray bursts and quasar absorbers (the largest sample so far) which have extinction and elemental column density measurements available. We find that extinctions and total column density of the volatile elements (Zn, S) are correlated (with a best-fit of dust-to-metals (DTM) 4.05x10-22 mag cm2) and consistent with the LG DTM relation. The refractory elements (Fe, Si) follow a similar, but less significant, relation offset about 1 dex from the LG relation. On the assumption that depletion onto dust grains is the cause, we compute the total (gas+dust-phase) column density and find a remarkable agreement with the LG DTM relation: a best-fit of 4.91x10-22 mag cm2. We then use our results to compute the amount of 'intervening metal from unknown sources' in random sightlines out to redshifts of z=5. Those metals implicate the presence of dust and give rise to an average 'cosmic dust dimming' effect which we express as a function of redshift, CDD(z). The CDD is unimportant out to redshifts of about 3, but because it is cumulative it becomes significant at redshifts z=3-5. Our results in this paper are based on a minimum of assumptions and effectively relying on observations.
Publisher
Cornell University Library, arXiv.org
Subject
