Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures

Details Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures

2009-10-16

arxiv.org/abs/0910.3015v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 4 figures, accepted to MNRAS

Scientific paper

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 diffuse IGM/WHIM. We performed a cross-correlation of a 34 x 34 degree area of 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 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) mK and 7 (49) mK would produce a 3 sigma 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 microG, 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 GALFACTS at Arecibo and those planned with the Murchison Widefield Array (MWA).

Affiliated with

Also associated with

No associations

Rating

Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-123187