Anisotropic model for dark matter halo with Hernquist density profile

被引：0

作者：

Ghosh, Mithun ^{[1
]}

机构：

[1] Bangaljhi Swami Vivekananda Vidyamandir HS, Nadia 741123, West Bengal, India

来源：

MODERN PHYSICS LETTERS A | 2024年 / 39卷 / 29N30期

关键词：

Dark matter; galactic halo; anisotropy; Hernquist density profile; NAVARRO-FRENK-WHITE; HIGH-VELOCITY TAIL; GALAXIES; DYNAMICS; NEBULAE;

D O I：

10.1142/S0217732324501426

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the observed flat galactic rotation curve feature and taking into account the presence of anisotropic dark matter with a Hernquist density profile, the space-time geometry of the halo region in galaxies is derived. The gravitational field inside the halo is attractive in nature, and the resultant space-time is flat. We find that our solution affirms the existence of stable circular orbits in the dark halo region. The expression for the equation of state parameter indicates that the matter within the dark halo is non-exotic in nature. An analysis is also conducted on several other aspects of the solution.

引用

页数：13

共 45 条

[1] Orbits in extended mass distributions: General results and the spirographic approximation [J].

Adams, FC ;

Bloch, AM .

ASTROPHYSICAL JOURNAL, 2005, 629 (01) :204-218

[2] The origin and implications of dark matter anisotropic cosmic infall on ≈ L* haloes [J].

Aubert, D ;

Pichon, C ;

Colombi, S .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 352 (02) :376-398

[3] Relativistic gravitation theory for the modified Newtonian dynamics paradigm [J].

Bekenstein, JD .

PHYSICAL REVIEW D, 2004, 70 (08)

[4]

BINNEY J, 1987, GALACTIC DYNAMICS

[5] Future evolution of cosmic structure in an accelerating universe [J].

Busha, MT ;

Adams, FC ;

Wechsler, RH ;

Evrard, AE .

ASTROPHYSICAL JOURNAL, 2003, 596 (02) :713-724

[6] Anisotropic fluid cosmology: An alternative to dark matter? [J].

Cadoni, M. ;

Sanna, A. P. ;

Tuveri, M. .

PHYSICAL REVIEW D, 2020, 102 (02)

[7] Gravitational collapse of self-similar and shear-free fluid with heat flow [J].

Chan, R ;

Da Silva, MFA ;

Da Rocha, JFV .

INTERNATIONAL JOURNAL OF MODERN PHYSICS D, 2003, 12 (03) :347-368

[8]

Dai N, 2024, Arxiv, DOI arXiv:2301.05088

[9]

de Vaucouleurs G., 1948, ANN DASTROPHYSIQUE, V11, P247

[10] The local high-velocity tail and the Galactic escape speed [J].

Deason, Alis J. ;

Fattahi, Azadeh ;

Belokurov, Vasily ;

Evans, N. Wyn ;

Grand, Robert J. J. ;

Marinacci, Federico ;

Pakmor, Ruediger .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 485 (03) :3514-3526

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