Steep slopes and preferred breaks in gamma-ray burst spectra: The role of photospheres and comptonization

Peter Istvan Meszaros, M. J. Rees

Research output: Contribution to journalArticle

322 Scopus citations

Abstract

The role of a photospheric component and of pair breakdown is examined in the internal shock model of gamma-ray bursts. We discuss some of the mechanisms by which they would produce anomalously steep low-energy slopes, X-ray excesses and preferred energy breaks. Subrelativistic Comptonization should dominate in high comoving luminosity bursts with high baryon load, while synchrotron radiation dominates the power-law component in bursts which have lower comoving luminosity or have moderate to low baryon loads. A photosphere leading to steep low-energy spectral slopes should be prominent in the lowest baryon load cases.

Original languageEnglish (US)
Pages (from-to)292-298
Number of pages7
JournalAstrophysical Journal
Volume530
Issue number1 PART 1
StatePublished - Feb 10 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Steep slopes and preferred breaks in gamma-ray burst spectra: The role of photospheres and comptonization'. Together they form a unique fingerprint.

  • Cite this