J/A+A/584/A48 New redshifts of 357 GBBs (Horvath+, 2015)
New data support the existence of the Hercules-Corona Borealis Great Wall.
Horvath I., Bagoly Z., Hakkila J., Toth L.V.
<Astron. Astrophys., 584, A48-48 (2015)>
=2015A&A...584A..48H 2015A&A...584A..48H (SIMBAD/NED BibCode)
ADC_Keywords: Gamma rays - Redshifts
Keywords: gamma rays: general - methods: data analysis - methods: statistical -
large-scale structure of Universe - cosmology: observations -
distance scale
Abstract:
Several large structures, including the Sloan Great Wall, the Huge
Large Quasar Group, and a large gamma-ray burst cluster referred to as
the Hercules-Corona Borealis Great Wall, appear to exceed the maximum
structural size predicted by Universal inflationary models. The
existence of very large structures such as these might necessitate
cosmological model modifications.
Gamma-ray bursts are the most luminous sources found in nature. They
are associated with the stellar endpoints of massive stars and are
found in and near distant galaxies. Since they are viable indicators
of the dense part of the Universe containing normal matter, the
spatial distribution of gamma-ray bursts can serve as tracers of
Universal large-scale structure.
An increased sample size of gamma-ray bursts with known redshift
provides us with the opportunity to validate or invalidate the
existence of the Hercules-Corona Borealis Great Wall.
Nearest-neighbour tests are used to search the larger sample for
evidence of clustering and a bootstrap point-radius method is used to
estimate the angular cluster size. The potential influence of angular
sampling biasing is studied to determine the viability of the results.
The larger gamma-ray burst database further supports the existence of
a statistically significant gamma-ray burst cluster at 1.6≤z<2.1 with
an estimated angular size of 2000-3000Mpc.
Although small number statistics limit our angular resolution and do
not rule out the existence of adjacent and/or line-of-sight smaller
structures, these structures must still clump together in order for us
to see the large gamma-ray burst cluster detected here. This cluster
provides support for the existence of very large-scale universal
heterogeneities.
Description:
We revisit the angular and radial distributions of GRBs with known
redshifts in an attempt to reexamine our previous claims suggesting
the existence of this structure. As of November 2013, the redshifts of
357 GRBs have been determined
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 49 357 ID, duration, coordinates, and redshift of the
357 GRBs as were published at
http://www.astro.caltech.edu/grbox/grbox.php
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See also:
http://www.astro.caltech.edu/grbox/grbox.php : Gamma-Ray Burst Online Index
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB GRB name
10- 16 F7.2 s T90 ?=- Duration
22- 30 F9.5 deg RAdeg Right ascension (J2000)
32- 40 F9.5 deg DEdeg Declinaiton (J2000)
42- 49 F8.6 --- z Redshift
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Jan-2016