2010MNRAS.402....2B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.26CET00:07:25

2010MNRAS.402....2B - Mon. Not. R. Astron. Soc., 402, 2-6 (2010/February-2)

Cross-correlation of diffuse synchrotron and large-scale structures.

BROWN S., FARNSWORTH D. and RUDNICK L.

Abstract (from CDS):

We explore for the first time the method of cross-correlation of radio synchrotron emission and tracers of large-scale structure in order to detect the warm-hot intergalactic medium (WHIM). We performed a cross-correlation of a 34°x34° area of Two-Micron All-Sky Survey (2MASS) galaxies for two redshift slices (0.03 < z < 0.04 and 0.06 < z < 0.07) with the corresponding region of the 1.4 GHz Bonn survey. For this analysis, we assumed that the synchrotron surface brightness is linearly proportional to surface density of galaxies. We also sampled the cross-correlation function (CCF) using 24 distant fields of the same size from the Bonn survey, to better assess the noise properties. Though we obtained a null result, we found that by adding a signal weighted by the 2MASS image with a filament (peak) surface brightness of 1 (7) and 7 (49) mK would produce a 3σ positive correlation for the 0.03 < z < 0.04 and 0.06 < z < 0.07 redshift slices, respectively. These detection thresholds correspond to minimum energy magnetic fields as low as 0.2 µG, close to some theoretical expectations for filament field values. This injected signal is also below the rms noise of the Bonn survey, and demonstrates the power of this technique and its utility for upcoming sensitive continuum surveys such as those planned with the Murchison Widefield Array.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: clusters: general - intergalactic medium

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4149 2
2 ACO 2065 ClG 15 22 42.6 +27 43 21           ~ 337 0
3 ACO 2079 ClG 15 28 04.7 +28 52 40           ~ 137 0
4 ACO 2122 ClG 15 44 29 +36 07.6           ~ 43 0
5 ACO 2124 ClG 15 44 59.3 +36 03 40           ~ 189 0
6 ACO 2197 ClG 16 28 10.4 +40 54 26           ~ 269 0
7 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1090 1

    Equat.    Gal    SGal    Ecl

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2020.02.26-00:07:25

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