Mulher, maternidade e trabalho: dilemas contemporâneos

A Theoretical Investigation of Gamma-Ray Burst Host Galaxies

“…For example, at redshift 2.5, Z = 1.0Z ⊙ , halo mass M halo = 5.0 × 10 12 M ⊙ , after the galactic evolving time 1.0 × 10 8 yr, we have dust extinction A v = 1.0 and the corresponding X-ray absorption N H,x = 4.7 × 10 22 cm −2 ; (2) the dust and metals surrounding the GRB in the host galaxy are distributed in an inhomogeneous way; there could be heavy absorption through the line of sight, but in other directions the absorption is slight. Also, in our model, we assume that the A v and N H,x are measured locally and do not change significantly if the dust and gas extend out to a few tens to hundreds of pc from the burst (Perna & Lazzati 2002, D'Elia et al 2009); however, suppose the observed optical extinction is due to the grain absorption far beyond this local region of GRB, the A v -N H,x correlation obtained by Schady et al (2007Schady et al ( , 2010 may be invalid and our calculations are strongly biased; (3) as mentioned in Section 2.2.2, the dust produced by the AGB population at high redshift should be taken into account.…”