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Verfasst von:Sarli-Waizmann, Eleonora [VerfasserIn]   i
 Meyer, Sven [VerfasserIn]   i
 Meneghetti, Massimo [VerfasserIn]   i
 Konrad, Sara [VerfasserIn]   i
 Majer, Charles Ludwig [VerfasserIn]   i
 Bartelmann, Matthias [VerfasserIn]   i
Titel:Reconstructing the projected gravitational potential of galaxy clusters from galaxy kinematics
Verf.angabe:Eleonora Sarli, Sven Meyer, Massimo Meneghetti, Sara Konrad, Charles L. Majer, and Matthias Bartelmann
E-Jahr:2014
Jahr:07 October 2014
Umfang:9 S.
Teil:volume:570
 year:2014
 extent:9
Fussnoten:Gesehen am 16.07.2020
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2014
Band/Heft Quelle:570(2014) Artikel-Nummer A9, 9 Seiten
ISSN Quelle:1432-0746
Abstract:We have developed a method for reconstructing the two-dimensional, projected gravitational potential of galaxy clusters from observed line-of-sight velocity dispersions of cluster galaxies. It is the second in an intended series of papers aiming at a unique reconstruction method for cluster potentials that combine lensing, X-ray, Sunyaev-Zel’dovich and kinematic data. The observed galaxy velocity dispersions are deprojected using the Richardson-Lucy algorithm. The obtained radial velocity dispersions are then related to the gravitational potential by using the tested assumption of a polytropic relation between the effective galaxy pressure and the density. Once the gravitational potential is obtained in three dimensions, projection along the line of sight yields the two-dimensional potential. For simplicity we adopt spherical symmetry and a known profile for the anisotropy parameter of the galaxy velocity dispersions. We tested the method with a numerically simulated galaxy cluster and the galaxies identified therein and performed the reconstruction for three different lines of sight. We extracted a projected velocity-dispersion profile from the simulated cluster and passed it through our algorithm, showing that the deviation between the true and the reconstructed gravitational potential is ≲10% within ≈ 1.5 <i>h<i/><sup>-1<sup/> Mpc from the cluster centre.
DOI:doi:10.1051/0004-6361/201321748
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1051/0004-6361/201321748
 Volltext: https://www.aanda.org/articles/aa/abs/2014/10/aa21748-13/aa21748-13.html
 DOI: https://doi.org/10.1051/0004-6361/201321748
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1724929577
Verknüpfungen:→ Zeitschrift

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