Zobrazeno 1 - 10
of 1 526
pro vyhledávání: '"Ralf, Bender"'
Publikováno v:
BMC Medical Research Methodology, Vol 22, Iss 1, Pp 1-18 (2022)
Abstract Background Meta-analyses are used to summarise the results of several studies on a specific research question. Standard methods for meta-analyses, namely inverse variance random effects models, have unfavourable properties if only very few (
Externí odkaz:
https://doaj.org/article/8445a5afa6a9476c91b3ac199dc8b5a0
Autor:
Mathias Lipka, Jens Thomas, Roberto Saglia, Ralf Bender, Maximilian Fabricius, Christian Partmann
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 17 (2024)
We analyze the dark matter (DM) halos of a sample of dwarf ellipticals (dEs) and discuss cosmological and evolutionary implications. Using orbit modeling, we recover their density slopes and, for the first time, halo flattening. We find that the “c
Externí odkaz:
https://doaj.org/article/60267bf348c04057b77f6f21d1092b26
Autor:
Mathias Lipka, Jens Thomas, Roberto Saglia, Ralf Bender, Maximilian Fabricius, Gary J. Hill, Matthias Kluge, Martin Landriau, Ximena Mazzalay, Eva Noyola, Taniya Parikh, Jan Snigula
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 16 (2024)
We analyze the stellar structure of a sample of dwarf ellipticals (dEs) inhabiting various environments within the Virgo cluster. Integral-field observations with a high spectral resolution allow us to robustly determine their low-velocity dispersion
Externí odkaz:
https://doaj.org/article/34e4093444f2489eab26d64829766e56
Autor:
Kayhan Gültekin, Karl Gebhardt, John Kormendy, Adi Foord, Ralf Bender, Tod R. Lauer, Jason Pinkney, Douglas O. Richstone, Scott Tremaine
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 16 (2024)
We present infrared photometry and Hubble Space Telescope imaging and spectroscopy of the Sab galaxy NGC 4826. Schwarzschild dynamical modeling is used to measure its central black hole mass M . Photometric decomposition is used to enable a compariso
Externí odkaz:
https://doaj.org/article/84f59d98181140999f21beb01c9c08c8
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 271, Iss 2, p 52 (2024)
In this study, we compare the structural parameters of ultradiffuse galaxies (UDGs) to those of other dwarf galaxies and investigate whether UDGs form a distinct population. We observed deep $u^{\prime} $ -, $g^{\prime} $ -, and $r^{\prime} $ -band i
Externí odkaz:
https://doaj.org/article/e8862100230743c7a2b666f89b863382
Autor:
Kianusch Mehrgan, Jens Thomas, Roberto Saglia, Taniya Parikh, Bianca Neureiter, Peter Erwin, Ralf Bender
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 1, p 127 (2024)
Evidence from different probes of the stellar initial mass function (IMF) of massive early-type galaxies (ETGs) has repeatedly converged on IMFs more bottom heavy than in the Milky Way (MW). This consensus has come under scrutiny due to often contrad
Externí odkaz:
https://doaj.org/article/2a7f5c2ada15420aab799ec48324c5f7
Publikováno v:
BMC Medical Research Methodology, Vol 20, Iss 1, Pp 1-13 (2020)
Abstract Background Network meta-analysis (NMA) is becoming increasingly popular in systematic reviews and health technology assessments. However, there is still ambiguity concerning the properties of the estimation approaches as well as for the meth
Externí odkaz:
https://doaj.org/article/cc296cb1531d4652a5cc819041634f7e
Autor:
Aishwarya Ashok, Anil Seth, Peter Erwin, Victor P. Debattista, Adriana de Lorenzo-Cáceres, Dmitri A. Gadotti, Jairo Méndez-Abreu, John E. Beckman, Ralf Bender, Niv Drory, Deanne Fisher, Ulrich Hopp, Matthias Kluge, Tutku Kolcu, Witold Maciejewski, Kianusch Mehrgan, Taniya Parikh, Roberto Saglia, Marja Seidel, Jens Thomas
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 1, p 100 (2023)
We present photometric and morphological analyses of nuclear star clusters (NSCs)—very dense, massive star clusters present in the central regions of most galaxies—in a sample of 33 massive disk galaxies within 20 Mpc, part of the “Composite Bu
Externí odkaz:
https://doaj.org/article/bf0559b54134492daa82cb903934c656
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 2, p 79 (2023)
We present the first systematic study of the detailed shapes of the line-of-sight velocity distributions (LOSVDs) in nine massive early-type galaxies (ETGs) using the novel nonparametric modeling code WINGFIT. High-signal spectral observations with t
Externí odkaz:
https://doaj.org/article/9a0041c503d2487a9ba69adb40e59455
Autor:
Matthias Kluge, Ralf Bender
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 267, Iss 2, p 41 (2023)
We investigate the roles of major and minor mergers during brightest cluster galaxy (BCG) assembly using surface brightness profiles, line indices, and fundamental plane relations. Based on our own sample and consistently reanalyzed Sloan Digital Sky
Externí odkaz:
https://doaj.org/article/0746f778f815494c9675d59bf12b7586