axna wa ayal padixanig parki

来源：蜘蛛抓取(WebSpider) 时间：2016-10-02 17:17 标签： ar ayal jinsi aza
Constraints on Off-Axis X-Ray Emission from Beamed Gamma-Ray Bursts
(arXiv:astro-ph/9907110)
Title:Constraints on Off-Axis X-Ray Emission from Beamed Gamma-Ray Bursts
Affiliation:AA(Astronomy Department, Harvard University, 60 Garden Street, Cambridge, MA 02138; .), AB(Astronomy Department, Harvard University, 60 Garden Street, Cambridge, MA 02138)
Publication:The Astrophysical Journal, Volume 523, Issue 1, pp. 187-191. ()
Publication Date:09/1999
Origin:APJ;
Astronomy Keywords:GAMMA RAYS: BURSTS, Gamma Rays: Bursts
Abstract Copyright:(c) 1999: The American Astronomical Society
Bibliographic Code:
We calculate the prompt X-ray emission as a function of the viewing
angle for beamed gamma-ray burst (GRB) sources. Prompt X-rays are
inevitable owing to the less highly blueshifted photons emitted at
angles &~1/γ relative to the beam symmetry axis, where γ
is the expansion Lorentz factor. The observed flux depends on the
combinations γΔθ and γθv,
where Δθ is the beaming angle and θv is
the viewing angle. We use the observed source counts of
γ-ray-selected GRBs to predict the minimum detection rate of
prompt X-ray bursts as a function of limiting sensitivity. We compare
our predictions with the results from the Ariel 5 catalog of fast X-ray
transients and find that Ariel's sensitivity is not great enough to
place significant constraints on γ and Δθ. We
estimate that a detector with fluence limit ~10-7 ergs
cm-2 in the 2-10 keV channel will be necessary in order to
distinguish between geometries. Because the X-ray emission is
simultaneous with the GRB emission, our predicted constraints do not
involve any model assumptions about the emission physics but simply
follow from special relativistic considerations.
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