Physical constraints on the halo mass function
نویسندگان
چکیده
منابع مشابه
Constraints on the slope of the dark halo mass function by microlensing observables⋆
We investigate the dark halo lens mass function (MF) for a wide class of spheroidal non singular isothermal models comparing observed and observable microlensing quantities for MACHO observations towards LMC and taking into account the detection efficiency. We evaluate the microlensing observable quantities, i.e. observable optical depth, number of events and mean duration, for models with homo...
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We derive mass functions for halo red dwarfs (stars just massive enough to burn hydrogen) with varying assumptions about metallicity and about possible unresolved binaries in the sample. The mass functions are obtained from the luminosity function of a sample of 114 local halo stars in the USNO parallax survey (Dahn et al. 1995); we use stellar models of Alexander et al. (1996). We find that th...
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Cosmological tests based on cluster counts require accurate calibration of the space density of massive halos, but most calibrations to date have ignored complex gas physics associated with halo baryons. We explore the sensitivity of the halo mass function to baryon physics using two pairs of gas-dynamic simulations that are likely to bracket the true behavior. Each pair consists of a baseline ...
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Deep fields are unique probes of the Galactic halo. With a limiting magnitude of, e.g., I = 30 mag, all stars down to the hydrogen-burning limit are detected out to distances of 10 kpc, while stars with 0.5 solar masses could be traced out to distances of 400 kpc. Thus deep fields provide an opportunity to study both the structure of the Galactic halo and the mass function of population (Pop) I...
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The fractional Brownian motion with index α is introduced to construct the fractional excursion set model. A new mass function with single parameter α is derived within the formalism, of which the Press-Schechter mass function (PS) is a special case when α = 1/2. Although the new mass function is computed assuming spherical collapse, comparison with the Sheth-Tormen fitting function (ST) shows ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1996
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/281.1.311