Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Frank, Matthias J."'
Autor:
Voggel, Karina, Hilker, Michael, Baumgardt, Holger, Collins, Michelle L. M., Grebel, Eva K., Husemann, Bernd, Richtler, Tom, Frank, Matthias J.
We present MUSE observations of the debated ultra faint stellar system Crater. We spectroscopically confirm 26 member stars of this system via radial velocity measurements. We derive the systematic instrumental velocity uncertainty of MUSE spectra to
Externí odkaz:
http://arxiv.org/abs/1604.06806
Autor:
Janz, Joachim, Norris, Mark A., Forbes, Duncan A., Huxor, Avon, Romanowsky, Aaron J., Frank, Matthias J., Escudero, Carlos G., Faifer, Favio R., Forte, Juan Carlos, Kannappan, Sheila J., Maraston, Claudia, Brodie, Jean P., Strader, Jay, Thompson, Bradley R.
In recent years, a growing zoo of compact stellar systems (CSSs) have been found whose physical properties (mass, size, velocity dispersion) place them between classical globular clusters (GCs) and true galaxies, leading to debates about their nature
Externí odkaz:
http://arxiv.org/abs/1511.03264
We report on the serendipitous discovery of a star-forming galaxy at redshift z=0.116 with morphological features that indicate an ongoing merger. This object exhibits two clearly separated components with significantly different colors, plus a possi
Externí odkaz:
http://arxiv.org/abs/1511.01499
Autor:
Hendricks, Benjamin, Boeche, Corrado, Johnson, Christian I., Frank, Matthias J., Koch, Andreas, Mateo, Mario, Bailey III, John I.
Publikováno v:
A&A 585, A86 (2016)
The globular cluster H4, located in the center of the Fornax dwarf spheroidal galaxy, is crucial for understanding the formation and chemical evolution of star clusters in low-mass galactic environments. H4 is peculiar because the cluster is signific
Externí odkaz:
http://arxiv.org/abs/1510.03880
Autor:
Frank, Matthias J., Koch, Andreas, Feltzing, Sofia, Kacharov, Nikolay, Wilkinson, Mark I., Irwin, Mike
Publikováno v:
A&A, 581 (2015) A72
NGC 2419 is a peculiar Galactic globular cluster in terms of size/luminosity, and chemical abundance anomalies. Here, we present Str\"omgren $uvby$ photometry of the cluster. Using the gravity- and metallicity-sensitive $c_1$ and $m_1$ indices, we id
Externí odkaz:
http://arxiv.org/abs/1510.02482
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
Autor:
Frank, Matthias J.
The last fifteen years have seen the discovery of new types of low-mass stellar systems that bridge the gap between the once well-separated regimes of galaxies and of star clusters. Whether such objects are considered galaxies depends also on the def
Externí odkaz:
http://arxiv.org/abs/1405.7823
Autor:
Zonoozi, Akram Hasani, Haghi, Hosein, Kuepper, Andreas H. W., Baumgardt, Holger, Frank, Matthias J., Kroupa, Pavel
Publikováno v:
MNRAS, 440, 3172-3183, (2014)
We use direct $N$-body calculations to study the evolution of the unusually extended outer halo globular cluster Palomar 4 (Pal~4) over its entire lifetime in order to reproduce its observed mass, half-light radius, velocity dispersion and mass funct
Externí odkaz:
http://arxiv.org/abs/1404.5969
We present an analysis of the radial dependence of the stellar mass function in the diffuse outer-halo globular cluster Palomar 14. Using archival HST/WFPC2 data of the cluster's central 39 pc (corresponding to ~0.85*r_h) we find that the mass functi
Externí odkaz:
http://arxiv.org/abs/1301.5010
Autor:
Frank, Matthias J., Hilker, Michael, Baumgardt, Holger, Côté, Patrick, Grebel, Eva K., Haghi, Hosein, Küpper, Andreas H. W., Djorgovski, S. G.
Publikováno v:
MNRAS, 423, 3 (2012) 2917-2932
We obtained precise line-of-sight radial velocities of 23 member stars of the remote halo globular cluster Palomar 4 (Pal 4) using the High Resolution Echelle Spectrograph (HIRES) at the Keck I telescope. We also measured the mass function of the clu
Externí odkaz:
http://arxiv.org/abs/1205.2693