2012ApJ...754..139R


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST01:14:39

2012ApJ...754..139R - Astrophys. J., 754, 139 (2012/August-1)

Testing gravitational lensing as the source of enhanced strong mg II absorption toward gamma-ray bursts.

RAPOPORT S., ONKEN C.A., SCHMIDT B.P., WYITHE J.S.B., TUCKER B.E. and LEVAN A.J.

Abstract (from CDS):

Sixty percent of gamma-ray bursts (GRBs) reveal strong Mg II absorbing systems, which is a factor of ∼2 times the rate seen along lines of sight to quasars. Previous studies argue that the discrepancy in the strong Mg II covering factor is most likely to be the result of either quasars being obscured due to dust or the consequence of many GRBs being strongly gravitationally lensed. We analyze observations of quasars that show strong foreground Mg II absorption. We find that GRB lines of sight pass closer to bright galaxies than would be expected for random lines of sight within the impact parameter expected for strong Mg II absorption. While this cannot be explained by obscuration in the GRB sample, it is a natural consequence of gravitational lensing. Upon examining the particular configurations of galaxies near a sample of GRBs with strong Mg II absorption, we find several intriguing lensing candidates. Our results suggest that lensing provides a viable contribution to the observed enhancement of strong Mg II absorption along lines of sight to GRBs, and we outline the future observations required to test this hypothesis conclusively.

Abstract Copyright:

Journal keyword(s): Gamma-ray burst: general - gravitational lensing: strong

Simbad objects: 20

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Number of rows : 20

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 GRB 021004 gB 00 26 54.68 +18 55 41.6           ~ 519 0
2 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 160 0
3 GRB 070721B gB 02 12 32.98 -02 11 39.8           ~ 104 0
4 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1365 0
5 GRB 060313 gB 04 26 28.180 -10 50 37.95 20.55 21.03 19.66     ~ 133 0
6 GRB 991216 gB 05 09 31.2983 +11 17 07.262           ~ 412 0
7 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 259 0
8 GRB 030429 gB 12 13 07.495 -20 54 49.54     23.70     ~ 122 0
9 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 290 0
10 GRB 020405 gB 13 58 03.12 -31 22 22.2   21.9 21.5     ~ 239 1
11 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 288 0
12 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 428 0
13 GRB 010222 G 14 52 12.5 +43 01 06           ~ 338 1
14 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 242 0
15 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 330 0
16 SN 2005nc SN* 18 32 32.560 +26 20 22.34           SNIc: 353 1
17 GRB 020813A gB 19 46 41.874 -19 36 04.81           ~ 288 0
18 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 523 1
19 GRB 061201 gB 22 08 32.060 -74 34 47.90           ~ 162 0
20 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 344 0

    Equat.    Gal    SGal    Ecl

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2021.05.06-01:14:39

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