Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-05-21
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
12 pages, 19 Figures, submitted to ApJ
Scientific paper
The \hi 21 cm transition line is expected to be an important probe into the cosmic dark ages and epoch of reionization. Foreground source removal is one of the principal challenges for the detection of this signal. This paper investigates the extragalactic point source contamination and how accurately bright sources ($\gtrsim 1$ ~Jy) must be removed in order to detect 21 cm emission with upcoming radio telescopes such as the Murchison Widefield Array (MWA). We consider the residual contamination in 21 cm maps and power spectra due to position errors in the sky-model for bright sources, as well as frequency independent calibration errors. We find that a source position accuracy of 0.1 arcsec will suffice for detection of the \hi power spectrum. For calibration errors, 0.05 % accuracy in antenna gain amplitude is required in order to detect the cosmic signal. Both sources of subtraction error produce residuals that are localized to small angular scales, $\kperp \gtrsim 0.05 $Mpc$^{-1}$, in the two-dimensional power spectrum.
Bowman David J.
Carilli Chris L.
Datta Animesh
No associations
LandOfFree
Bright Source Subtraction Requirements For Redshifted 21 cm Measurements 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 Bright Source Subtraction Requirements For Redshifted 21 cm Measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bright Source Subtraction Requirements For Redshifted 21 cm Measurements will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-412518