Structural properties of Dark Matter Halos

نویسندگان

  • Vincenzo Antonuccio-Delogu
  • Ugo Becciani
  • Antonio Pagliaro
چکیده

Using the results of a high mass resolution (256 particles) N-body simulation of a cluster-forming region, we study the statistic σv− M for low mass halos (M < 1012M⊙), and we compare it with three theoretical models. At the final redshift halos are well described by the Truncated Isothermal Sphere model recently introduced by Shapiro, Iliev & Raga (1999). We speculate that this is a consequence of the action of tidal fields on galaxy formation within clusters.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The Accretion-Driven Structure and Kinematics of Relaxed Dark Halos

It has recently been shown that relaxed spherically symmetric dark matter halos develop from the inside out, by permanently adapting their inner structure to the boundary conditions imposed by the current accretion rate. Such a growth allows one to infer the typical density profiles of halos. Here we follow the same approach to infer the typical spherically averaged profiles of the main structu...

متن کامل

Measuring the Distribution of Galaxies Between Halos

We develop a method to measure the probability, P (N ;M), of finding N galaxies in a dark-matter halo of mass M from the theoretically determined clustering properties of dark-matter halos and the observationally measured clustering properties of galaxies. Knowledge of this function and the distribution of the dark matter completely specifies all clustering properties of galaxies on scales larg...

متن کامل

The Distribution of Dark Matter in Spirals

In the past years a wealth of observations allowed to unravel the structural properties of the Dark Matter Halos around spirals. First, their rotation curves follow an Universal profile (URC) that can be described in terms of an exponential thin stellar disk and a dark halo with a constant density core, whose relative importance increases with galaxy luminosity. Careful studies of individual ob...

متن کامل

Neutral Hydrogen and the Missing Satellites of the Local Group

We present a comparison of the leftover satellites at z=0 in a cold dark matter dominated simulation of the formation of the Local Group to the distribution of observed neutral hydrogen high-velocity clouds and compact high-velocity clouds. The ∼2000 leftover satellites in the simulation have dark matter masses which range between 0.5 to 10 × 10 9 M ⊙ , sizes between 3 to 30 kpc, and distances ...

متن کامل

Dark Halos around Spirals; no role for collisionless Cold Dark Matter particles

From the analysis of high–quality optical rotation curves of 9 low–luminosity disk galaxies, we find that the properties of the dark halos around these objects are inconsistent with the halo density profile of the halos emerging in high resolution Cold Dark Matter N-body simulations. Dark halos around galaxies are almost constant density spheres, very different from the characteristic CDM ρ(r) ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1999