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Grant support

I thank Benjamin Jaillant, Julien Lavalle, Vivian Poulin, and Martin Stref for fruitful discussions on this topic, and the anonymous referee for the very useful comments and suggestions. My work is supported by CNRS-IN2P3. I also acknowledge support from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreements No 690575 and No 674896, in addition to recurrent institutional funding by CNRS-IN2P3 and the University of Montpellier.

Analysis of institutional authors

Lacroix, ThomasCorresponding Author

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Article

Dynamical constraints on a dark matter spike at the Galactic centre from stellar orbits

Publicated to:ASTRONOMY & ASTROPHYSICS. 619 (A46): - 2018-11-01 619(A46), DOI: 10.1051/0004-6361/201832652

Authors: Lacroix, Thomas;

Affiliations

CNRS, LUPM, Pl Eugene Bataillon, F-34095 Montpellier 05, France - Author
Univ Montpellier, UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier 05, France - Author

Abstract

In this work I use astrometric and spectroscopic data on the S2 star at the Galactic centre (GC) up to 2016 to derive specific constraints on the size of a dark matter (DM) spike around the central supermassive black hole Sgr A*. These limits are the best direct constraints on a DM spike at the GC for non-annihilating dark matter and exclude a spike with radius greater than a few tens of parsecs for cuspy outer halos and a few hundred parsecs for cored outer halos.

Keywords

Black hole physicsCelestial mechanicsDark matterEfficientGalaxy: centerLarge telescopeMass-distributionMilky-waySgr a-asteriskStarSupermassive black-hole

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal ASTRONOMY & ASTROPHYSICS due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2018, it was in position 10/69, thus managing to position itself as a Q1 (Primer Cuartil), in the category Astronomy & Astrophysics.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 1.59. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Weighted Average of Normalized Impact by the Scopus agency: 2.41 (source consulted: FECYT Feb 2024)
  • Field Citation Ratio (FCR) from Dimensions: 28.62 (source consulted: Dimensions Jun 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-06-17, the following number of citations:

  • WoS: 36
  • Scopus: 56
  • OpenCitations: 49

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-06-17:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 16.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 16 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 12.33.
  • The number of mentions on the social network Facebook: 1 (Altmetric).
  • The number of mentions on the social network X (formerly Twitter): 6 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: France.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (LACROIX, THOMAS) and Last Author (LACROIX, THOMAS).

the author responsible for correspondence tasks has been LACROIX, THOMAS.