Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Küpper, Andreas H. W."'
Simulations of tidal streams show that close encounters with dark matter subhalos induce density gaps and distortions in on-sky path along the streams. Accordingly, observing disrupted streams in the Galactic halo would substantiate the hypothesis th
Externí odkaz:
http://arxiv.org/abs/1705.07128
Autor:
Zonoozi, Akram Hasani, Haghi, Hosein, Kroupa, Pavel, Küpper, Andreas H. W., Baumgardt, Holger
Palomar 4 is a low-density globular cluster with a current mass $\approx30000 M_{\odot}$ in the outer halo of the Milky Way with a two-body relaxation time of the order of a Hubble time. Yet, it is strongly mass segregated and contains a stellar mass
Externí odkaz:
http://arxiv.org/abs/1701.06168
Autor:
Küpper, Andreas H. W., Johnston, Kathryn V., Mieske, Steffen, Collins, Michelle L. M., Tollerud, Erik J.
The ultra-faint satellite galaxy Hercules has a strongly elongated and irregular morphology with detections of tidal features up to 1.3 deg (3 kpc) from its center. This suggests that Hercules may be dissolving under the Milky Way's gravitational inf
Externí odkaz:
http://arxiv.org/abs/1608.05085
Nuclear star clusters (NSCs) and supermassive black holes (SMBHs) both inhabit galactic nuclei, coexisting in a range of bulge masses, but excluding each other in the largest or smallest galaxies. We propose that the transformation of NSCs into SMBHs
Externí odkaz:
http://arxiv.org/abs/1606.01909
Autor:
Küpper, Andreas H. W., Zonoozi, Akram H., Haghi, Hosein, Luetzgendorf, Nora, Mieske, Steffen, Frank, Matthias, Baumgardt, Holger, Kroupa, Pavel
Outer-halo globular clusters show large half-light radii and flat stellar mass functions, depleted in low-mass stars. Using N-body simulations of globular clusters on eccentric orbits within a Milky Way-like potential, we show how a cluster's half-ma
Externí odkaz:
http://arxiv.org/abs/1512.05967
Autor:
Küpper, Andreas H. W., Balbinot, Eduardo, Bonaca, Ana, Johnston, Kathryn V., Hogg, David W., Kroupa, Pavel, Santiago, Basilio X.
Using the example of the tidal stream of the Milky Way globular cluster Palomar 5 (Pal 5), we demonstrate how observational data on streams can be efficiently reduced in dimensionality and modeled in a Bayesian framework. Our approach combines detect
Externí odkaz:
http://arxiv.org/abs/1502.02658
This paper presents an example where the morphology of a single stellar stream can be used to rule out a specific galactic potential form without the need for velocity information. We investigate the globular cluster Palomar5 (Pal 5), which is tidall
Externí odkaz:
http://arxiv.org/abs/1410.3477
Publikováno v:
2014, ApJ, 795, 116
4U 1820-30 is a low-mass X-ray binary near the center of the globular cluster NGC 6624 consisting of, at least, one neutron star and one helium white dwarf. Analyzing 16 years of data from the Rossi X-ray Timing Explorer (RXTE) allows us to measure i
Externí odkaz:
http://arxiv.org/abs/1409.4767
We use direct $N$-body calculations to investigate the impact of primordial mass segregation on the size scale and mass-loss rate of star clusters in a galactic tidal field. We run a set of simulations of clusters with varying degrees of primordial m
Externí odkaz:
http://arxiv.org/abs/1409.1332
We present evidence for mass segregation in the outer-halo globular cluster Palomar 14, which is intuitively unexpected since its present-day two-body relaxation time significantly exceeds the Hubble time. Based on archival Hubble Space Telescope ima
Externí odkaz:
http://arxiv.org/abs/1407.2937