کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1767866 | 1020204 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dark matter in very poor galaxy groups
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
We have analyzed a sample of 7000 galaxies in the Local Supercluster (LS) (VÂ <Â 3100Â km/s) selected from the LEDA database [Makarov, D.I., Karachentsev, I.D. A new catalogue of multiple galaxies in the local supercluster small galaxy groups. Small Galaxy Groups ASP Confer. Ser. 209, 40-46, 2000]. We have derived physical properties of poor LS groups selected by dynamical and 3D-Voronoi tessellation methods. Median values of mass-to-luminosity ratios for poor LS groups selected by these methods are 50 Mâ/Lâ and 34 Mâ/Lâ, respectively. Physical parameters of LS galaxy triplets in comparison with other samples were evaluated. We suggest that the Dressler effect is present even in such poor groups as galaxy triplets. The data suggest that dark matter haloes are associated with the individual galaxies for LS triplets, which we find are dynamically younger systems. This contrasts with the properties of the Interacting and Northern & Southern triplet samples. For these two samples, the data suggest that the dark matter resides in a common halo. The median values of the mass-to-luminosity ratios for LS triplets, Northern & Southern triplets, and Interacting triplets are 35 Mâ/Lâ, 47 Mâ/Lâ, and 13 Mâ/Lâ, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 42, Issue 3, 5 August 2008, Pages 591-595
Journal: Advances in Space Research - Volume 42, Issue 3, 5 August 2008, Pages 591-595
نویسندگان
O.V. Melnyk, I.B. Vavilova,