کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1779486 1022003 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dark matter dominance at all radii in the superthin galaxy UGC 7321
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
Dark matter dominance at all radii in the superthin galaxy UGC 7321
چکیده انگلیسی

We model the shape and density profile of the dark matter halo of the low surface brightness, superthin galaxy UGC 7321, using the observed rotation curve and the H i scale height data as simultaneous constraints. We treat the galaxy as a gravitationally coupled system of stars and gas, responding to the gravitational potential of the dark matter halo. An isothermal halo of spherical shape with a core density in the range of 0.039–0.057M⊙pc-3 and a core radius between 2.5 and 2.9 kpc, gives the best fit to the observations for a range of realistic gas parameters assumed. We find that the best-fit core radius is only slightly higher than the stellar disc scale length (2.1 kpc), unlike the case of the high surface brightness galaxies where the halo core radius is typically 3–4 times the disc scale length of the stars. Thus our model shows that the dark matter halo dominates the dynamics of the low surface brightness, superthin galaxy UGC 7321 at all radii, including the inner parts of the galaxy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 15, Issue 1, January 2010, Pages 89–95
نویسندگان
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