2007ApJ...654L..17C

Query : 2007ApJ...654L..17C

2007ApJ...654L..17C - Astrophys. J., 654, L17-L20 (2007/January-1)

A metal-rich molecular cloud surrounds GRB 050904 at redshift 6.3.

CAMPANA S., LAZZATI D., RIPAMONTI E., PERNA R., COVINO S., TAGLIAFERRI G., MORETTI A., ROMANO P., CUSUMANO G. and CHINCARINI G.

Abstract (from CDS):

GRB 050904 is the gamma-ray burst with the highest measured redshift. We performed time-resolved X-ray spectroscopy of the late GRB and early afterglow emission. We find robust evidence for a decrease with time of the soft X-ray-absorbing column. We model the evolution of the column density due to the flash ionization of the GRB and early afterglow photons. This allows us to constrain the metallicity and geometry of the absorbing cloud. We conclude that the progenitor of GRB 050904 was a massive star embedded in a dense metal-enriched molecular cloud with Z≳0.03 Z☉. This is the first local measurement of metallicity in the close environment of a GRB and one of the highest redshift metallicity measurements. We also find that the dust associated with the cloud cannot be similar to that of our Galaxy but must be either sizably depleted or dominated by silicate grains. We discuss the implications of these results for GRB progenitors and high-redshift star formation.

Abstract Copyright: ∼

Journal keyword(s): ISM: Dust, Extinction - Gamma Rays: Bursts - ISM: Abundances - Stars: Formation

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 496 0

Query : 2007ApJ...654L..17C

Basic data :
GRB 050904 -- Gamma-ray Burst
Other object types: otypes_help 		gB (GRB), UV (2009ApJ)
ICRS coord. (ep=J2000) : 		00 54 50.794 +14 05 09.42 (Ultraviolet) [ 2300 2300 90 ] D 2009ApJ...690..163R
FK4 coord. (ep=B1950 eq=1950) : 		00 52 13.194 +13 48 54.43 [ 2300 2300 90 ]
Gal coord. (ep=J2000) : 		124.186243 -48.777496 [ 2300 2300 90 ]
Radial velocity / Redshift / cz : 		V(km/s) 288733 [600] / z(~) 6.295 [0.002] / cz 1887194 [600]
   D 2006ApJ...637L..69W
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GRB 050904

References (496 between 1850 and 2026) (Total 496)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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