Lens Mapping of Dark Matter Substructure with Vsop-2

نویسندگان

  • Shigenori Ohashi
  • Masashi Chiba
چکیده

Hierarchical clustering models of cold dark matter (CDM) predict that about 5% 10% of a galaxy-sized halo with mass ∼ 10 solar masses (M⊙) resides in substructures (CDM subhalos) with masses ∼ < 108M⊙. To directly identify such substructures, we propose to observe radio continuum emission from multiply imaged QSOs using VSOP-2 with a high angular resolution.

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

Lensing Optical Depth for Substructure and Isolated Dark Matter Halos

Multiple-image quasar lenses can be used to constrain the substructure mass fraction in galaxy-sized dark matter halos via anomalous flux ratios of lensed images. The flux ratios, however, can be affected by both the substructure in the lens halo and by isolated small-mass halos along the entire line-ofsight to the lensed source. While lensing by dark matter clumps near the lens galaxy is more ...

متن کامل

Lensing Optical Depths for Substructure and Isolated Dark Matter Halos

Multiply-imaged quasar lenses can be used to constrain the substructure mass fraction in galaxysized dark matter halos via anomalous flux ratios in lensed images. The flux ratios, however, can be affected by both the substructure in the lens halo and by isolated small-mass halos along the entire line-of-sight to the lensed source. While lensing by dark matter clumps near the lens galaxy is more...

متن کامل

Parity Dependence in Strong Lens Systems as a Probe of Dark Matter Substructure

The amount of mass in small, dark matter clumps within galaxies (substructure) is an important test of cold dark matter. One approach to measuring the substructure mass fraction is to analyze the fluxes of images that have been strongly lensed by a galaxy. Flux ratios between images that are anomalous with respect to smooth (no substructure) models have previously suggested that there is a grea...

متن کامل

A New Channel for Detecting Dark Matter Substructure in Galaxies: Gravitational Lens Time Delays

We show that dark matter substructure in galaxy-scale halos perturbs the time delays between images in strong gravitational lens systems. The variance of the effect depends on the subhalo mass function, scaling as the product of the substructure mass fraction and a characteristic mass of subhalos (namely 〈m2〉/〈m〉). Time delay perturbations therefore complement gravitational lens flux ratio anom...

متن کامل

The Effect of Satellite Galaxies on Gravitational Lensing Flux Ratios

Gravitational lenses with anomalous flux ratios are often cited as possible evidence for dark matter satellites predicted by simulations of hierarchical merging in cold dark matter cosmogonies. We show that the fraction of quads with anomalous flux ratios depends primarily on the total mass and spatial extent of the satellites, and the characteristic lengthscale d1/2 of their distribution. If d...

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 2008