Investigating the Complex Ring Morphology in UGC 10168: A Photometric and Structural Analysis of a (R1R2′)SABa(r′l)a Galaxy

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Received: Dec. 18, 2025 Revised: Apr. 18, 2025 Accepted: May, 06, 2025 Published: 01-03-2026
DOI: https://doi.org/10.30723/ijp.v24i1.1410
Keywords:
Galaxy, CVRHS, UGC 10168, SDSS, Pseudorings

Main Article Content

Zeinab F. Hussein
Department of Astronomy and Space, College of Science, University of Baghdad, Baghdad, Iraq
https://orcid.org/0000-0002-7980-9675
Abdullah K. Ahmed
Department of Astronomy and Space, College of Science, University of Baghdad, Baghdad, Iraq

Abstract

This study provides a comprehensive photometric and structural analysis of the galaxy UGC 10168, which is classified as (R₁R₂′)SABa(r′l)a in the Comprehensive de Vaucouleurs Revised Hubble-Sandage (CVRHS) system. UGC 10168 is an intermediate barred spiral galaxy with intricate inner and outer ring structures, which presents an intriguing scenario for studying resonant feature dynamics. Surface photometry was used to analyze the luminosity distribution, ellipticity, and position angle profiles along the semi-major axis of the galaxy, utilizing multi-wavelength imaging from the Sloan Digital Sky Survey (SDSS). The classification (R₁R₂′) emphasizes the existence of two distinct outer pseudorings that are formed by the winding spiral arms, whereas (r′l) implies an interior, less regular ring that encircles the bar. The galaxy's barred morphology (SAB) and early-type spiral features (Sa) contribute to a complex structural profile, which was analyzed in detail using photometric decomposition techniques. The R₁ and R₂′ pseudorings are conceivably associated with the galaxy's bar dynamics and the influence of Lindblad resonances, as our findings disclose notable resonant structures. The colour profiles, calculated from the differences in light intensity between the SDSS filters (g-r, r-i and i-z) were analyzed to understand the gradients in stellar populations and the level of star formation within the rings, bar, and disk. Distinct colour variations between the inner and outer rings indicate differing stellar ages and star-forming areas affected by resonances. This study enhances understanding of ring creation and resonance events in barred spiral galaxies, offering insights into their evolutionary trajectories within galactic dynamics and shape.

Received: Dec. 18, 2025 Revised: Apr. 18, 2025 Accepted: May, 06, 2025

Article Details

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Vol. 24 No. 1 (2026)

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Articles
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This work is licensed under a Creative Commons Attribution 4.0 International License.

© 2023 The Author(s). Published by the College of Science, University of Baghdad. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License. 

How to Cite

1.
F. Hussein Z, Ahmed AK. Investigating the Complex Ring Morphology in UGC 10168: A Photometric and Structural Analysis of a (R1R2′)SABa(r′l)a Galaxy. IJP [Internet]. 2026 Mar. 1 [cited 2026 Mar. 1];24(1):142-55. Available from: https://www.ijp.uobaghdad.edu.iq/index.php/physics/article/view/1410

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