Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-04
Astrophys.J. 628 (2005) 14-20
Astronomy and Astrophysics
Astrophysics
To appear in ApJ, final version
Scientific paper
10.1086/430753
We show that, in the halo model of large-scale structure formation, the difference between the Fourier and the DWT (discrete wavelet transform) power spectra provides a statistical measurement of the halos. This statistical quantity is free from parameters related to the shape of the mass profile and the identification scheme of halos. That is, the statistical measurement is invariant in the sense that models with reasonably defined and selected parameters of the halo models should yield the same difference of the Fourier and DWT spectra. This feature is useful to extract ensemble averaged properties of halos, which cannot be obtained with the identification of individual halo. To demonstrate this point, we show with WIGEON hydrodynamical simulation samples that the spectrum difference provides a quantitative measurement of the discrepancy of the distribution of baryonic gas from that of the underlying dark matter field within halos. We also show that the mass density profile of halos in physical space can be reconstructed with this statistical measurement. This profile essentially is the average over an ensemble of halos, including well virialized halos as well as halos with significant internal substructures. Moreover, this reconstruction is sensitive to the tail of the mass density profile. We showed that the profile with $1/r^3$ tail gives very different result from that of $1/r^2$. Other possible applications of this method are discussed as well.
Fang Li-zhi
Feng Long-Long
He Ping
No associations
LandOfFree
A Parameter-free Statistical Measurement of Halos with Power Spectra 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 A Parameter-free Statistical Measurement of Halos with Power Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Parameter-free Statistical Measurement of Halos with Power Spectra will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-280379