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Morphological and Photometric Characteristics of Nearby Local Group Dwarf Galaxies
Mälardalen University, Faculty of Philosophy, Department of Business and Mathematics.
University of Baghdad, Baghdad, Iraq.
2026 (English)In: Iraqi Journal of Science, ISSN 0067-2904, Vol. 67, no 2, p. 1182-1195Article in journal (Refereed) Published
Abstract [en]

The morphological and photometric characteristics of dwarf galaxies in the local group are key to understanding galaxy structure and evolution, providing insight into the properties of low-luminosity systems. However, their faint nature makes them challenging to observe, especially at greater distances. In this study, we examined the morphological classification, spatial distribution, and photometric properties of a sample of 33 nearby dwarf galaxies at approximately 2 kpc, using data from the Sloan Digital Sky Survey (SDSS-IV) data release 18 (DR18), to investigate how these galaxies are varying in terms of their colors, surface brightness, and structural features. Our results reveal notable trends in the relationship between morphology and distance for dwarf irregular (dIrr) and dwarf spheroidal (dSph) galaxies. We observe that dIrr galaxies are more dispersed and commonly found at greater distances, additionally, they are gas-rich galaxies with recent star formation, while dSph galaxies contain older stellar populations and tend to cluster closer to their host galaxies like the Miley Way. In general, we noticed that the dSph galaxies appear redder and fainter due to the intermediate and old age stars, and the containment of metal-rich stars, whereas the dIrr galaxies tend to be bluer and brighter, indicating the presence of younger stars which contain fewer heavy elements. © 2026, University of Baghdad-College of Science. All rights reserved.

Place, publisher, year, edition, pages
University of Baghdad College of Science , 2026. Vol. 67, no 2, p. 1182-1195
Keywords [en]
Dwarf galaxies, local group, photometric galaxy morphology, redshift
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:mdh:diva-76282DOI: 10.24996/ijs.2026.67.2.41Scopus ID: 2-s2.0-105032538591OAI: oai:DiVA.org:mdh-76282DiVA, id: diva2:2047239
Available from: 2026-03-19 Created: 2026-03-19 Last updated: 2026-03-19Bibliographically approved

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Al-Mashhadani, Layali

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