Behind the dust curtain : the spectacular case of GRB 160623A (CROSBI ID 244739)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Pintore, F. ; Tiengo, A. ; Mereghetti, S. ; Vianello, G. ; Giuliani, A. ; Salvaterra, R. ; Esposito, P. ; Costantini, E. ; Bošnjak, Željka
engleski
Behind the dust curtain : the spectacular case of GRB 160623A
We report on the X-ray dust-scattering features observed around the afterglow of the gamma-ray burst GRB 160623A. With an XMM–Newton observation carried out ∼2 d after the burst, we found evidence of at least six rings, with angular size expanding between ∼2 and 9 arcmin, as expected for X-ray scattering of the prompt gamma-ray burst (GRB) emission by dust clouds in our Galaxy. From the expansion rate of the rings, we measured the distances of the dust layers with extraordinary precision: 528.1 ± 1.2, 679.2 ± 1.9, 789.0 ± 2.8, 952 ± 5, 1539 ± 20 and 5079 ± 64 pc. A spectral analysis of the ring spectra, based on an appropriate dust-scattering model (BARE-GR-B) and the estimated burst fluence, allowed us to derive the column density of the individual dust layers, which are in the range 7 × 10^20– 1.5 × 10^22 cm^−2. The farthest dust layer (i.e. the one responsible for the smallest ring) is also the one with the lowest column density and it is possibly very extended, indicating a diffuse dust region. The properties derived for the six dust layers (distance, thickness and optical depth) are generally in good agreement with independent information on the reddening along this line of sight and on the distribution of molecular and atomic gas.
scattering–gamma-ray burst ; individual ; GRB 160623A–dust ; extinction– galaxies ; haloes – X-rays ; bursts – X-rays: ISM
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Podaci o izdanju
472 (2)
2017.
1465-1472
objavljeno
0035-8711
1365-2966
10.1093/mnras/stx2062