The X-ray spectrum of the black hole candidate GX339-4 in a low state

2003/06/19 by A. Corongiu, L. Chiappetti, Francesco Haardt +5
Physics and Astronomy · #Astrophysical Phenomena and Observations #astro-ph

paper · pdf · doi:10.1051/0004-6361:20030923

published as Astron.Astrophys.408:347-352,2003 · 6 pages, LaTeX, 4 pictures

arxiv created 2003/06/19 · openalex publication_date 2003/08/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

We report on four observations of the black hole candidate GX 339-4 collected in the spectral range 0.4-140 keV with the BeppoSAX satellite during 1997. All our spectra are typical of a black hole candidate in its low-hard state, i.e. are dominated by the hard tail of the emission from the corona. Although the direct emission from the accretion disk in the soft X-ray range is weak, spectra are well described only with models that take into consideration the Compton reflection of hard X-rays from the corona onto the surface of an accretion disk of non negligible extent.

Citations

• Low‐Luminosity States of the Black Hole Candidate GX 339−4. I.ASCAand Simultaneous Radio/RXTEObservations
• Spectral Evolution of PKS 2155−304 Observed withBeppoSAXduring an Active Gamma‐Ray Phase
• Broad-band X-ray/γ-ray spectra and binary parameters of GX 339–4 and their astrophysical implications
• Radio/X-ray correlation in the low/hard state of GX 339–4