Thermal Emission from a Hot Cocoon Surrounding the Jet of XRF 060218

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dc.creatorLiang, Enwei
dc.creatorZhang, Bing
dc.creatorZhang, Bin-Bin
dc.creatorDai, Z. G.
dc.date2006-06-22
dc.date.accessioned2026-07-07T07:12:15Z
dc.date.available2026-07-07T07:12:15Z
dc.descriptionIt is long speculated that long duration gamma-ray bursts (GRBs) originate froma relativistic jet emerging from a collapsing massive star progenitor. Although associations of core-collapsing supernovae with long GRB afterglows have been identified in a number of systems, including the latest X-ray flash (XRF) 060218/SN 2006aj connection detected by Swift, direct evidence of a relativistic jet emerging from a collapsing star is still lacking. Here we report the detection of a thermal emission component (high-T component) accompanying the prompt X-ray emission of XRF 060218, with temperature kT_H=1.21+0.22/-0.24 keV and effective blackbody radius R_H~ 5\times 10^{9} cm. This high-T component co-exists with another low-T thermal component as reported by Campana et al. 2006 for at least 2700 seconds, but evolves independently with respect to the low-T component by tracing the lightcurve of the non-thermal component. We identify this high-T thermal component as the emission of a hot cocoon surrounding the relativistic jet, as expected from the theoretical models.
dc.description11 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0606565
dc.identifierhttp://arxiv.org/abs/astro-ph/0606565
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112024
dc.subjectAstrophysics
dc.titleThermal Emission from a Hot Cocoon Surrounding the Jet of XRF 060218
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