THE DARK MATTER DENSITY PROFILE OF THE FORNAX DWARF
نویسندگان
چکیده
منابع مشابه
Dark Matter in Dwarf Galaxies: Latest Density Profile Results
We present high-resolution two-dimensional velocity fields in Hα and CO of the nearby dwarf galaxy NGC 2976. Our observations were made at both higher spatial resolution (∼ 75 pc) and higher velocity resolution (13 km s in Hα and 2 km s in CO) than most previous studies. We show that NGC 2976 has a very shallow dark matter density profile, with ρ(r) lying between ρ ∝ r and ρ ∝ r. We carefully t...
متن کاملthe effect of traffic density on the accident externality from driving the case study of tehran
در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...
15 صفحه اولA Large Dark Matter Core in the Fornax Dwarf Spheroidal Galaxy?
We use measurements of the stellar velocity dispersion pro£le of the Fornax dwarf spheroidal galaxy to derive constraints on its dark matter distribution. Though the data are unable to distinguish between models with small cores and those with cusps, we show that a large & 1 kpc dark matter core in Fornax is highly implausible. Irrespective of the origin of the core, reasonable dynamical limits...
متن کاملThe density profile of equilibrium and non - equilibrium dark matter
We study the diversity of the density profiles of dark matter halos based on a large set of high-resolution cosmological simulations of 256 3 particles. The cosmological models include four scale-free models and three representative cold dark matter models. The simulations have good force resolution. In each cosmological model, there are about 400 massive halos which have more than 10 4 particl...
متن کاملDwarf Dark Matter Halos
We use N-body simulations to study properties of dwarf halos with virial masses in the range 10 − 10hM⊙. Unlike recent reported results, we find that the density profiles of relaxed dwarf halos are well fitted by the NFW profile and do not have cores. We estimate the distribution of concentrations for halos in mass range that covers six orders of magnitude from 10 hM⊙ to 10 13 hM⊙, and find tha...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/746/1/89