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Universe
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Universe: Feature Papers 2024—"Galaxies and Clusters"
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Universe: Feature Papers 2024—"Galaxies and Clusters"

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Galaxies and Clusters".

Deadline for manuscript submissions: 31 October 2024 | Viewed by 2042

Special Issue Editor

Dr. Mauro D’Onofrio

E-Mail Website
Guest Editor
Dipartimento di Fisica & Astronomia “Galileo Galilei”, Università di Padova, IT35122 Padova , Italy
Interests: galaxies: structure and evolution; galaxies: kinematics and dynamics; clusters: structure and evolution; active galactic nuclei; novae and supernovae

Special Issue Information

Dear Colleagues,

A new era of our knowledge of galaxies and clusters is opening today thanks to the new space/ground telescopes and the large deep surveys. New methods of data analysis are also in progress to manage this large flux of information.

This Universe special issue dedicated to "Galaxies and Clusters" aims to collect several research papers connected to such new observations of galaxies and clusters at all redshift as well as to the new invented methods used to reduce and analyze the data.

Dr. Mauro D’Onofrio
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Universe is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • galaxies and clusters
  • galaxy formation and evolution
  • the structure of galaxies
  • dwarf galaxies
  • star formation in galaxies
  • galaxy clustering
  • the halo of galaxies
  • galaxy satellites
  • dark matter in galaxies
  • lensing of galaxies
  • deep surface brightness images
  • galaxy counts
  • machine learning and artificial intelligence for galaxy/cluster analysis

Published Papers (2 papers)

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Research

26 pages, 17785 KiB  
Article
The κ-Model under the Test of the SPARC Database
by Gianni Pascoli
Universe 2024, 10(3), 151; https://doi.org/10.3390/universe10030151 - 21 Mar 2024
Viewed by 659
Abstract
Our main goal here is to conduct a comparative analysis between the well-known MOND theory and a more recent model called the κ-model. An additional connection, between the κ-model and two other novel MOND-type theories, Newtonian Fractional-Dimension Gravity (NFDG) and Refracted [...] Read more.
Our main goal here is to conduct a comparative analysis between the well-known MOND theory and a more recent model called the κ-model. An additional connection, between the κ-model and two other novel MOND-type theories, Newtonian Fractional-Dimension Gravity (NFDG) and Refracted Gravity (RG), is likewise presented. All these models are built to overtake the DM paradigm, or at least to strongly reduce the dark matter content. Whereas they rely on different formalisms, however, all four seem to suggest that the universal parameter, a0, appearing in MOND theory could intrinsically be correlated to either the sole baryonic mean mass density (RG and κ-model) and/or to the dimension of the object under consideration (NFDG and κ-model). We then confer to parameter a0 a more flexible status of multiscale parameter, as required to explain the dynamics together in galaxies and in galaxy clusters. Eventually, the conformal gravity theory (CFT) also seems to have some remote link with the κ-model, even though the first one is an extension of general relativity, and the second one is Newtonian in essence. The κ-model has been tested on a small sample of spiral galaxies and in galaxy clusters. Now, we test this model on a large sample of galaxies issued from the SPARC database. Full article
(This article belongs to the Special Issue Universe: Feature Papers 2024—"Galaxies and Clusters")
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19 pages, 1623 KiB  
Article
Dark Matter in Fractional Gravity III: Dwarf Galaxies Kinematics
by Francesco Benetti, Andrea Lapi, Giovanni Gandolfi, Minahil Adil Butt, Yacer Boumechta, Balakrishna S. Haridasu and Carlo Baccigalupi
Universe 2023, 9(11), 478; https://doi.org/10.3390/universe9110478 - 08 Nov 2023
Viewed by 1189
Abstract
Recently, we put forward a framework where the dark matter (DM) component within virialized halos is subject to a non-local interaction originated by fractional gravity (FG) effects. In previous works, we demonstrated that such a framework can substantially alleviate the small-scale issues of [...] Read more.
Recently, we put forward a framework where the dark matter (DM) component within virialized halos is subject to a non-local interaction originated by fractional gravity (FG) effects. In previous works, we demonstrated that such a framework can substantially alleviate the small-scale issues of the standard ΛCDM paradigm, without altering the DM mass profile predicted by N-body simulations, and retaining its successes on large cosmological scales. In this paper, we investigate further, to probe FG via the high-quality data of individual dwarf galaxies, by exploiting the rotation velocity profiles inferred from stellar and gas kinematic measurements in eight dwarf irregulars, and the projected velocity dispersion profiles inferred from the observed dynamics of stellar tracers in seven dwarf spheroidals and in the ultra-diffuse galaxy DragonFly 44. We find that FG can reproduce extremely well the rotation and dispersion curves of the analyzed galaxies, performing in most instances significantly better than the standard Newtonian setup. Full article
(This article belongs to the Special Issue Universe: Feature Papers 2024—"Galaxies and Clusters")
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