Mass classification of dark matter perturbers of stellar tidal streams

Montanari, Francesco; García-Bellido, J.

doi:10.1016/j.dark.2022.100978

Cited by 4 publications

(1 citation statement)

References 44 publications

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“…Therefore, they would be viable candidates to contribute to the cosmic DM budget. They can be searched with many different methods below others gravitational lensing, measuring dynamical gravitational distortions like in stellar streams [220] or by gravitational waves [221].…”

Section: Primordial Black Hole Evaporationmentioning

confidence: 99%

TeV Dark Matter Searches in the Extragalactic Gamma-ray Sky

Hütten

Kerszberg

2022

Galaxies

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High-energetic gamma rays from astrophysical targets constitute a unique probe for annihilation or decay of heavy particle dark matter (DM). After several decades, diverse null detections have resulted in strong constraints for DM particle masses up to the TeV scale. While the gamma-ray signature is expected to be universal from various targets, uncertainties of astrophysical origin strongly affect and weaken the limits. At the same time, spurious signals may originate from non-DM related processes. The many gamma-ray targets in the extragalactic sky being searched for DM play a crucial role to keep these uncertainties under control and to ultimately achieve an unambiguous DM detection. Lately, a large progress has been made in combined analyses of TeV DM candidates towards different targets by using data from various instruments and over a wide range of gamma-ray energies. These approaches not only resulted in an optimal exploitation of existing data and an improved sensitivity, but also helped to level out target- and instrument-related uncertainties. This review gathers all searches in the extragalactic sky performed so far with the space-borne Fermi-Large Area Telescope, the ground-based imaging atmospheric Cherenkov telescopes, and the High-Altitude Water Cherenkov Gamma-Ray Observatory (HAWC). We discuss the different target classes and provide a complete list of all analyses so far.

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Section: Primordial Black Hole Evaporationmentioning

confidence: 99%

TeV Dark Matter Searches in the Extragalactic Gamma-ray Sky

Hütten

Kerszberg

2022

Galaxies

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Observational evidence for primordial black holes: A positivist perspective

Carr,

Clesse,

García-Bellido

et al. 2024

Physics Reports

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Swarming in stellar streams: Unveiling the structure of the Jhelum stream with ant colony-inspired computation

Awad,

Canducci,

Balbinot

et al. 2024

A&A

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The halo of the Milky Way galaxy hosts multiple dynamically coherent substructures known as stellar streams that are remnants of tidally disrupted orbiting systems such as globular clusters (GCs) and dwarf galaxies (DGs). A particular case is that of the Jhelum stream, which is known for its unusual and complex morphology. Using the available data from the Gaia DR3 catalog, we extracted a region on the sky that contains Jhelum, and fine-tuned this selection by enforcing limits on the magnitude and proper motion of the selected stars. We then applied the novel Locally Aligned Ant Technique (LAAT) on the position and proper motion space of stars belonging to the selected region to highlight the stars that are closely aligned with a local manifold in the data and the stars belonging to regions of high local density. We find that the overdensity representing the stream in proper motion space is composed of two components, and show the correspondence of these two signals to the previously reported narrow and broad spatial components of Jhelum. We then made use of the radial velocity measurements provided by the $S^5$ survey and confirm, for the first time, a separation between the stars belonging to the two components in radial velocity. We show that the narrow and broad components have velocity dispersions of $4.84^ $ km/s and $19.49^ $ km/s, and metallicity dispersions of $0.15^ $ and $0.34^ $, respectively. These measurements, as well as the given difference in component widths, could be explained with a probable scenario where Jhelum is the remnant of a GC embedded within a DG and where both were accreted onto the Milky Way during their infall. Although the properties of Jhelum could be explained with this merger scenario, other progenitors of the narrow component remain possible such as a nuclear star cluster or a DG. To rule these possibilities out, we would need more observational data of member stars of the stream. Our analysis shows that the internal structure of streams holds great information on their past formation history, and therefore provides further insight into the merger history of the Milky Way.

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Mass classification of dark matter perturbers of stellar tidal streams

Cited by 4 publications

References 44 publications

TeV Dark Matter Searches in the Extragalactic Gamma-ray Sky

TeV Dark Matter Searches in the Extragalactic Gamma-ray Sky

Observational evidence for primordial black holes: A positivist perspective

Swarming in stellar streams: Unveiling the structure of the Jhelum stream with ant colony-inspired computation

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