On the effect of cosmic rays in bolometric CMB measurements from the stratosphere

Details On the effect of cosmic rays in bolometric CMB measurements from the stratosphere On the effect of cosmic rays in bolometric CMB measurements from the stratosphere

2010-01-14

arxiv.org/abs/1001.2509v3

Astronomy and Astrophysics, 519, A24, (2010)

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

This new version is the one accepted for publication on Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361/201014065

Ultra-sensitive bolometric detectors in balloon-borne or satellite missions have the potential to discover low-level non gaussian features in the Cosmic Microwave Background (CMB), due to topological defects or to the inflation process. However, the space environment includes a population of cosmic rays (CR), which produce spurious spikes in bolometric signals. In this paper we analyze how CR affect these measurements and the estimates of non-gaussianity and of angular power spectra of the CMB. Using accurate simulations of noise and CR events in bolometric detectors, we find that a de-spiking technique based on outliers removal in the detector signals contributing to the same sky pixel works well in removing CR events larger than the noise. Low level events hidden in the noise produce skewness and kurtosis of the temperatures of the pixels, indicating low-level non-gaussianity. Moreover, when the low-level CR distribution is not known a-priori, the standard noise estimation pipeline produces a positive bias of the power spectrum at high multipoles. In experiments with detector sensitivity better than 100 $\mu K / \sqrt{Hz}$, in an environment less favorable than the earth stratosphere, the CR-induced non gaussianity is likely to affect significantly the results.

Affiliated with

Also associated with

No associations

Rating

On the effect of cosmic rays in bolometric CMB measurements from the stratosphere 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 On the effect of cosmic rays in bolometric CMB measurements from the stratosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the effect of cosmic rays in bolometric CMB measurements from the stratosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-355331