Diverse properties of interstellar medium embedding gamma-ray bursts at the epoch of reionization

Renyue Cen, Taysun Kimm

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Analysis is performed on ultra-high-resolution large-scale cosmological radiation-hydrodynamic simulations to quantify, for the first time, the physical environment of long-duration gamma-ray bursts (GRBs) at the epoch of reionization. We find that, on parsec scales, 13% of GRBs remain in high-density (≥104cm-3) low-temperature star-forming regions, whereas 87% of GRBs occur in low-density (∼10-2.5cm-3) high-temperature regions heated by supernovae. More importantly, the spectral properties of GRB afterglows, such as the neutral hydrogen column density, total hydrogen column density, dust column density, gas temperature, and metallicity of intervening absorbers, vary strongly from sight line to sight line. Although our model explains extant limited observationally inferred values with respect to circumburst density, metallicity, column density, and dust properties, a substantially larger sample of high-z GRB afterglows would be required to facilitate a statistically solid test of the model. Our findings indicate that any attempt to infer the physical properties (such as metallicity) of the interstellar medium (ISM) of the host galaxy based on a very small number (usually one) of sight lines would be precarious. Utilizing high-z GRBs to probe the ISM and intergalactic medium should be undertaken properly, taking into consideration the physical diversities of the ISM.

Original languageEnglish
Article number50
JournalAstrophysical Journal
Volume794
Issue number1
DOIs
Publication statusPublished - 2014 Oct 10

Fingerprint

gamma ray bursts
embedding
time measurement
metallicity
visual perception
afterglows
dust
hydrogen
intergalactic media
gas temperature
line of sight
supernovae
absorbers
physical property
physical properties
hydrodynamics
probe
galaxies
stars
probes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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abstract = "Analysis is performed on ultra-high-resolution large-scale cosmological radiation-hydrodynamic simulations to quantify, for the first time, the physical environment of long-duration gamma-ray bursts (GRBs) at the epoch of reionization. We find that, on parsec scales, 13{\%} of GRBs remain in high-density (≥104cm-3) low-temperature star-forming regions, whereas 87{\%} of GRBs occur in low-density (∼10-2.5cm-3) high-temperature regions heated by supernovae. More importantly, the spectral properties of GRB afterglows, such as the neutral hydrogen column density, total hydrogen column density, dust column density, gas temperature, and metallicity of intervening absorbers, vary strongly from sight line to sight line. Although our model explains extant limited observationally inferred values with respect to circumburst density, metallicity, column density, and dust properties, a substantially larger sample of high-z GRB afterglows would be required to facilitate a statistically solid test of the model. Our findings indicate that any attempt to infer the physical properties (such as metallicity) of the interstellar medium (ISM) of the host galaxy based on a very small number (usually one) of sight lines would be precarious. Utilizing high-z GRBs to probe the ISM and intergalactic medium should be undertaken properly, taking into consideration the physical diversities of the ISM.",
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Diverse properties of interstellar medium embedding gamma-ray bursts at the epoch of reionization. / Cen, Renyue; Kimm, Taysun.

In: Astrophysical Journal, Vol. 794, No. 1, 50, 10.10.2014.

Research output: Contribution to journalArticle

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