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Sains Malaysiana 53(11)(2024):
3771-3778
http://doi.org/10.17576/jsm-2024-5311-19
Derivation of a
Rotation Curve Model Based on Time of Events Theory and Its Application on
Samples of Several Spiral Galaxies
(Terbitan Model Lengkung Putaran Berdasarkan Teori Masa Peristiwa dan Aplikasinya pada Sampel Beberapa Galaksi Lingkaran)
JAZEEL H.
AZEEZ1,*, SADEEM ABBAS FADHIL1 & ZAMRI ZAINAL ABIDIN2
1Department of Physics, College of Sciences,
Al-Nahrain University, 10070, Baghdad, Iraq
Diserahkan: 21 Julai 2024/Diterima: 2 September 2024
Abstract
A new
model of rotation curves in spiral galaxies is derived and applied to several
spiral galaxies. This model is based on a new theory called the ‘time of
events’ theory, which was published elsewhere. The theory led to derive a multiscale model
that applies to the problem of rotation curves in the galaxies as a
non-adiabatic system. The equations of the derived multiscale model will be
generalized in the current work to apply to the gases inside the galaxy to
reach a general semi-empirical model that relates rotational velocity with the
galaxy radius. The derived equation showed an excellent agreement with
experimental results for five galaxies. The findings showed that the bulge
plays a limited role for the galaxies with large extensions like IC 2574 and
NGC 3198, where the dark matter in the halo region controls and determines the
shape of the diagram of the rotation curves in these galaxies. Furthermore, in
three bared galaxies NGC 1068, NGC 1097, and NGC 6503, the bulge has the most
major role in controlling the rotation dynamics in these galaxies.
Keywords: Dark matter;
rotation curve; spiral galaxies; time of events theory
Abstrak
Suatu model baharu lengkungan putaran galaksi berputar diperoleh dan diaplikasikan kepada beberapa galaksi berputar. Model ini adalah didasarkan pada teori baharu yang diperoleh daripada hasil terbitan artikel jurnal lain dan dikenali sebagai ‘masa kejadian’. Teori ini dapat menghasilkan model berbilang skala yang diaplikasikan kepada masalah lengkungan putaran galaksi sebagai sistem bukan adiabatik. Persamaan model berbilang skala terbitan akan digeneralisasikan di dalam kertas ini untuk digunakan pada gas di dalam galaksi untuk mencapai model separa empirik umum yang mengaitkan halaju putaran dengan jejari galaksi. Persamaan yang diterbitkan menunjukkan keserasian yang sangat baik dengan keputusan uji kaji untuk lima galaksi yang dipilih. Penemuan menunjukkan bahawa tonjolan pusat galaksi memainkan peranan terhad untuk galaksi yang mempunyai tambahan seperti IC 2574 dan NGC 3198 dengan jirim gelap di kawasan lingkaran mengawal dan menentukan bentuk rajah lengkung putaran dalam semua galaksi tersebut. Sebagai tambahan, dalam tiga galaksi berpalang NGC 1068, NGC 1097 dan NGC 6503, tonjolan pusat galaksi memainkan peranan paling utama dalam mengawal dinamik putaran semua galaksi tersebut.
Kata kunci: Galaksi lingkaran; lengkung putaran; perkara gelap; teori masa kejadian
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