2005A&A...440..809B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET09:31:14

2005A&A...440..809B - Astronomy and Astrophysics, volume 440, 809-817 (2005/9-4)

On the nature of X-ray flashes.

BARRAUD C., DAIGNE F., MOCHKOVITCH R. and ATTEIA J.L.

Abstract (from CDS):

We discuss the origin of X-Ray Flashes (XRFs), a recently discovered class of Gamma-Ray Bursts (GRBs). Using a simplified model for internal shocks we check if XRFs can be intrinsically soft due to some specific values of the parameters describing the relativistic outflow emerging from the central engine. We generate a large number of synthetic events and find that XRFs are obtained when the contrast Γmaxmin of the Lorentz factor distribution is small while the average Lorentz factor Γ is large. A few XRFs may be GRBs at large redshifts but we exclude this possibility for the bulk of the population. If outflows with a small contrast are commonly produced, even a large population of XRFs could be explained. If conversely the Lorentz factor distribution within the wind is broad, one should then rely on extrinsic causes, such as viewing angle effects or high redshift.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - shock waves - radiation mechanisms: non thermal

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1130 1
2 GRB 990704 gB 12 19 27.3 -03 50 22           ~ 50 0
3 GRB 000615 gB 15 32.6 +73 48           ~ 27 0
4 GRB 011030 gB 20 43 35.4 +77 17 20           ~ 69 0
5 GRB 040701 G 20 47 46.3 -40 14 13           ~ 42 1
6 GRB 030723 gB 21 49 24.40 -27 42 47.4           ~ 120 0
7 GRB 020427 gB 22 09 28.3 -65 19 32           ~ 47 0
8 GRB 020903 gB 22 48 42.34 -20 46 09.3           ~ 218 1
9 GRB 981226 gB 23 29 37.2 -23 55 54           ~ 100 1

    Equat.    Gal    SGal    Ecl

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2021.03.01-09:31:14

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