Studying Generalised Polytropic and Warm Dark Matter in NGC 5055

Clicks: 14
ID: 331604
2026
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Emerging

Ranked #1,035 of 1,339 articles by views in monthly notices of the royal astronomical society

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 1,339 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Abstract Galaxy rotation curves provide a powerful probe of mass distributions in spiral galaxies. We present a general relativistic analysis of NGC 5055 using its observed rotation curve and WISE W1 (3.4 μm) photometry to constrain the stellar mass profile. Adopting a static, spherically symmetric spacetime with anisotropic matter (vanishing radial pressure), we fit a modified exponential azimuthal velocity law to kinematic data, reconstructing metric functions and deriving enclosed mass, energy density, and tangential pressure profiles. The stellar mass underpredicts the total gravitating mass at intermediate-to-large radii, indicating dominant dark matter. The physical viability of the resulting relativistic model is examined through energy conditions, causality constraints, and a generalised polytropic equation of state analysis. Among the candidate equations of state tested — Bose–Einstein condensate, Chaplygin gas, linear fluid, and generalised polytropic — only the generalised polytropic form p = Kργ with γ = 0.91 and K = 4.63 × 10−8 achieves an excellent fit , firmly placing the dark matter of NGC 5055 in the Warm Dark Matter regime. All energy conditions and causality constraints are satisfied, and the halo is stable against gravitational cracking. Sterile neutrinos or gravitinos of keV-scale mass are identified as the most physically motivated particle candidates. Overall, this study demonstrates that combining rotation-curve data with photometric stellar mass estimates within a general relativistic framework provides a consistent and physically viable description of the mass distribution in spiral galaxies such as NGC 5055.
Reference Key
openalex_W7220841789 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Aritra Sanyal, Md Khalid Hossain, Farook Rahaman
Are you one of these authors? Claim your profile
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1901
URL
https://doi.org/10.1093/mnras/stag1901
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.