کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487772 | 1523724 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Millisecond radio pulsars with known masses: Parameter values and equation of state models
ترجمه فارسی عنوان
پالسرهای رادیویی میلی ثانیه با توده های شناخته شده: مقادیر پارامترها و معادلات مدل های حالت
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
چکیده انگلیسی
The recent fast growth of a population of millisecond pulsars with precisely measured mass provides an excellent opportunity to characterize these compact stars at an unprecedented level. This is because the stellar parameter values can be accurately computed for known mass and spin rate and an assumed equation of state (EoS) model. For each of the 16 such pulsars and for a set of EoS models from nucleonic, hyperonic, strange quark matter and hybrid classes, we numerically compute fast spinning stable stellar parameter values considering the full effect of general relativity. This first detailed catalogue of the computed parameter values of observed millisecond pulsars provides a testbed to probe the physics of compact stars, including their formation, evolution and EoS. We estimate uncertainties on these computed values from the uncertainty of the measured mass, which could be useful to quantitatively constrain EoS models. We note that the largest value of the central density Ïc in our catalogue is â¼5.8 times the nuclear saturation density Ïsat, which is much less than the expected maximum value 13Ïsat. We argue that the Ïc-values of at most a small fraction of compact stars could be much larger than 5.8Ïsat. Besides, we find that the constraints on EoS models from accurate radius measurements could be significantly biased for some of our pulsars, if stellar spinning configurations are not used to compute the theoretical radius values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 54, July 2017, Pages 61-71
Journal: New Astronomy - Volume 54, July 2017, Pages 61-71
نویسندگان
Sudip Bhattacharyya, Ignazio Bombaci, Debades Bandyopadhyay, Arun V. Thampan, Domenico Logoteta,