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  Inner dark matter distribution of the Cosmic Horseshoe (J1148+1930) with gravitational lensing and dynamics

Schuldt, S., Chirivì, G., Suyu, S. H., Yildirim, A., Sonnenfeld, A., Halkola, A., et al. (2019). Inner dark matter distribution of the Cosmic Horseshoe (J1148+1930) with gravitational lensing and dynamics. Astronomy and Astrophysics, 631: A40. doi:10.1051/0004-6361/201935042.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-6238-E Version Permalink: http://hdl.handle.net/21.11116/0000-0005-6239-D
Genre: Journal Article

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 Creators:
Schuldt, S.1, Author              
Chirivì, G.1, Author              
Suyu, S. H.1, Author              
Yildirim, A.1, Author              
Sonnenfeld, A., Author
Halkola, A., Author
Lewis, G. F., Author
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: We present a detailed analysis of the inner mass structure of the Cosmic Horseshoe (J1148+1930) strong gravitational lens system observed with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3). In addition to the spectacular Einstein ring, this systems shows a radial arc. We obtained the redshift of the radial arc counterimage zs, r = 1.961 ± 0.001 from Gemini observations. To disentangle the dark and luminous matter, we considered three different profiles for the dark matter (DM) distribution: a power law profile, the Navarro, Frenk, and White (NFW) profile, and a generalized version of the NFW profile. For the luminous matter distribution, we based the model on the observed light distribution that is fitted with three components: a point mass for the central light component resembling an active galactic nucleus, and the remaining two extended light components scaled by a constant mass-to-light ratio (M/L). To constrain the model further, we included published velocity dispersion measurements of the lens galaxy and performed a self-consistent lensing and axisymmetric Jeans dynamical modeling. Our model fits well to the observations including the radial arc, independent of the DM profile. Depending on the DM profile, we get a DM fraction between 60% and 70%. With our composite mass model we find that the radial arc helps to constrain the inner DM distribution of the Cosmic Horseshoe independently of the DM profile.

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 Dates: 2019-10-17
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201935042
Other: LOCALID: 3183286
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 631 Sequence Number: A40 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1