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The lens SW05 J143454.4+522850: a fossil group at redshift 0.6?
- Publication Year :
- 2021
- Publisher :
- arXiv, 2021.
-
Abstract
- Fossil groups are considered the end product of natural galaxy group evolution in which group members sink towards the centre of the gravitational potential due to dynamical friction, merging into a single, massive, and X-ray bright elliptical. Since gravitational lensing depends on the mass of a foreground object, its mass concentration, and distance to the observer, we can expect lensing effects of such fossil groups to be particularly strong. This paper explores the exceptional system $\mathrm{J}143454.4+522850$. We combine gravitational lensing with stellar population-synthesis to separate the total mass of the lens into stars and dark matter. The enclosed mass profiles are contrasted with state-of-the-art galaxy formation simulations, to conclude that SW05 is likely a fossil group with a high stellar to dark matter mass fraction $0.027\pm0.003$ with respect to expectations from abundance matching $0.012\pm0.004$, indicative of a more efficient conversion of gas into stars in fossil groups.<br />Comment: 8 pages, 9 figures, submitted to MNRAS
- Subjects :
- Physics
010308 nuclear & particles physics
530 Physics
Dark matter
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
10192 Physics Institute
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics - Astrophysics of Galaxies
01 natural sciences
Redshift
Stars
Gravitational potential
Gravitational lens
1912 Space and Planetary Science
Space and Planetary Science
Galaxy group
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
Galaxy formation and evolution
3103 Astronomy and Astrophysics
Dynamical friction
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....85bcf77a6b39a6ae8f275597485f29eb
- Full Text :
- https://doi.org/10.48550/arxiv.2104.03324