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Title: MODELING EXTRAGALACTIC EXTINCTION THROUGH GAMMA-RAY BURST AFTERGLOWS

Abstract

We analyze extragalactic extinction profiles derived through gamma-ray burst afterglows, using a dust model specifically constructed on the assumption that dust grains are not immutable but respond, time-dependently, to the local physics. Such a model includes core-mantle spherical particles of mixed chemical composition (silicate core, sp{sup 2}, and sp{sup 3} carbonaceous layers), and an additional molecular component in the form of free-flying polycyclic aromatic hydrocarbons. We fit most of the observed extinction profiles. Failures occur for lines of sight, presenting remarkable rises blueward of the bump. We find a tendency for the carbon chemical structure to become more aliphatic with the galactic activity, and to some extent with increasing redshifts. Moreover, the contribution of the molecular component to the total extinction is more important in younger objects. The results of the fitting procedure (either successes and failures) may be naturally interpreted through an evolutionary prescription based on the carbon cycle in the interstellar medium of galaxies.

Authors:
; ; ;  [1];  [2]
  1. INAF—Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (Italy)
  2. INAF—Osservatorio Astronomico di Palermo, P.za Parlamento 1, I-90134 Palermo (Italy)
Publication Date:
OSTI Identifier:
22667418
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 829; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; CARBON; CARBON CYCLE; COSMIC DUST; COSMIC GAMMA BURSTS; EVOLUTION; GALAXIES; GAMMA RADIATION; LAYERS; POLYCYCLIC AROMATIC HYDROCARBONS; RED SHIFT; SILICATES; SIMULATION; TIME DEPENDENCE

Citation Formats

Zonca, Alberto, Mulas, Giacomo, Casu, Silvia, Aresu, Giambattista, and Cecchi-Pestellini, Cesare. MODELING EXTRAGALACTIC EXTINCTION THROUGH GAMMA-RAY BURST AFTERGLOWS. United States: N. p., 2016. Web. doi:10.3847/0004-637X/829/1/22.
Zonca, Alberto, Mulas, Giacomo, Casu, Silvia, Aresu, Giambattista, & Cecchi-Pestellini, Cesare. MODELING EXTRAGALACTIC EXTINCTION THROUGH GAMMA-RAY BURST AFTERGLOWS. United States. https://doi.org/10.3847/0004-637X/829/1/22
Zonca, Alberto, Mulas, Giacomo, Casu, Silvia, Aresu, Giambattista, and Cecchi-Pestellini, Cesare. 2016. "MODELING EXTRAGALACTIC EXTINCTION THROUGH GAMMA-RAY BURST AFTERGLOWS". United States. https://doi.org/10.3847/0004-637X/829/1/22.
@article{osti_22667418,
title = {MODELING EXTRAGALACTIC EXTINCTION THROUGH GAMMA-RAY BURST AFTERGLOWS},
author = {Zonca, Alberto and Mulas, Giacomo and Casu, Silvia and Aresu, Giambattista and Cecchi-Pestellini, Cesare},
abstractNote = {We analyze extragalactic extinction profiles derived through gamma-ray burst afterglows, using a dust model specifically constructed on the assumption that dust grains are not immutable but respond, time-dependently, to the local physics. Such a model includes core-mantle spherical particles of mixed chemical composition (silicate core, sp{sup 2}, and sp{sup 3} carbonaceous layers), and an additional molecular component in the form of free-flying polycyclic aromatic hydrocarbons. We fit most of the observed extinction profiles. Failures occur for lines of sight, presenting remarkable rises blueward of the bump. We find a tendency for the carbon chemical structure to become more aliphatic with the galactic activity, and to some extent with increasing redshifts. Moreover, the contribution of the molecular component to the total extinction is more important in younger objects. The results of the fitting procedure (either successes and failures) may be naturally interpreted through an evolutionary prescription based on the carbon cycle in the interstellar medium of galaxies.},
doi = {10.3847/0004-637X/829/1/22},
url = {https://www.osti.gov/biblio/22667418}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 829,
place = {United States},
year = {Tue Sep 20 00:00:00 EDT 2016},
month = {Tue Sep 20 00:00:00 EDT 2016}
}