2011A&A...525A.113S


Query : 2011A&A...525A.113S

2011A&A...525A.113S - Astronomy and Astrophysics, volume 525A, 113-113 (2011/1-1)

The missing gas problem in GRB host galaxies: evidence for a highly ionised component.

SCHADY P., SAVAGLIO S., KRUEHLER T., GREINER J. and RAU A.

Abstract (from CDS):

There is considerable discrepancy between the amount of X-ray absorption and what is inferred from optical (rest frame UV) as measured along gamma-ray burst (GRB) sight lines, with the former typically an order of magnitude higher than what would be expected from the measurement of neutral element species via optical absorption line spectroscopy. We explored this ``missing gas problem'' in a sample of 29 GRBs with redshifts in the range 0.7-6.3 by studying the X-ray and optical spectra, as well as the afterglow broadband spectral energy distributions. The low ionisation species detected in the UV are associated with the neutral interstellar medium in the GRB host galaxy, while soft X-ray absorption, which is weakly dependent on the ionisation state of the gas, provides a probe of the total column of gas along the sight line. After careful consideration of any systematic effects, we find that the neutral gas consists of ≲10% of the total gas, and this limit decreases the more ionised the X-ray absorbing gas is, which in our spectral fits is assumed to be neutral. Only a very small fraction of this ionised gas, however, is detected in UV absorption lines with ionisation potentials up to ∼200eV (i.e. Si IV, C IV, N V, O VI), which leaves us to postulate that the X-ray excess comes from ultra-highly-ionised, dense gas in the GRB vicinity.

Abstract Copyright:

Journal keyword(s): gamma rays: ISM - galaxies: irregular - ISM: abundances - ultraviolet: ISM - gamma rays: galaxies

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 GRB 071031 gB 00 25 37.40 -58 03 33.9           ~ 162 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10856 1
3 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 461 0
4 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 149 0
5 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 637 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16995 1
7 Fermi bn090328401 gB 06 02 39.69 -41 52 55.1           ~ 167 1
8 GRB 050505 gB 09 27 03.300 +30 16 23.70     20.74     ~ 188 0
9 Fermi bn090423330 gB 09 55 33.19 +18 08 57.7           ~ 348 0
10 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1194 1
11 GRB 030323 gB 11 06 09.4 -21 46 13           ~ 133 1
12 GRB 080330 gB 11 17 06.70 +30 36 24.1           ~ 130 0
13 GRB 030226 gB 11 33 04.9 +25 53 56           ~ 200 0
14 Fermi bn090323002 gB 12 42 50.28 +17 03 11.9           ~ 213 1
15 GRB 080607 gB 12 59 47.14 +15 55 09.6           ~ 230 0
16 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 308 0
17 GRB 020405 gB 13 58 03.12 -31 22 22.2   21.9 21.5     ~ 247 1
18 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 306 0
19 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 457 0
20 GRB 010222 G 14 52 12.5 +43 01 06           ~ 351 1
21 GRB 080721 gB 14 57 55.76 -11 43 24.9           ~ 161 0
22 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 985 1
23 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 264 0
24 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 355 0
25 GRB 060510B gB 15 56 29.200 +78 34 12.00           ~ 140 0
26 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 331 0
27 GRB 000926 gB 17 04 15 +51 46.0           ~ 360 0
28 GRB 080413A gB 19 09 11.73 -27 40 39.6           ~ 139 0
29 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1796 2
30 GRB 020813A gB 19 46 41.874 -19 36 04.81           ~ 302 0
31 GRB 071003 gB 20 07 24.50 +10 56 48.8           ~ 166 0
32 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 278 0
33 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 380 0
34 GRB 990712 gB 22 31 53.061 -73 24 28.58           ~ 259 1
35 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 204 0
36 Fermi bn090926181 gB 23 33 36.18 -66 19 25.9           ~ 293 0

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2023.10.04-07:37:35

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