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The dark matter halo of NGC 1399 - CDM or MOND?
T. Richtler, Y. Schuberth, M. Hilker +3
Central galaxies in galaxy clusters may be key discriminants in the competition between the cold dark matter (CDM) paradigm and modified Newtonian dynamics (MOND). We investigate t…
Globular Clusters at the Centre of the Fornax Cluster: Tracing Interactions Between Galaxies
L. P. Bassino, T. Richtler, F. R. Faifer +4
We present the combined results of two investigations: a large-scale study of the globular cluster system (GCS) around NGC 1399, the central galaxy of the Fornax cluster, and a stu…
Dynamics of the NGC 4636 Globular Cluster System - An extremely dark matter dominated galaxy?
Y. Schuberth, T. Richtler, B. Dirsch +4
We present the first dynamical study of the globular cluster system of NGC 4636. This giant elliptical galaxy is claimed to be extremely dark matter dominated, according to X-ray o…
Large-scale study of the NGC 1399 globular cluster system in Fornax
L. P. Bassino, F. R. Faifer, J. C. Forte +4
We present a Washington C and Kron-Cousins R photometric study of the globular cluster system of NGC 1399, the central galaxy of the Fornax cluster. A large areal coverage of 1 squ…
Low Mass X-ray Binaries in 6 Elliptical Galaxies: Connection to Globular Clusters
Eunhyeuk Kim, Dong-Woo Kim, Giuseppina Fabbiano +4
We present a systematic study of the low mass X-ray binary (LMXB) populations of 6 elliptical galaxies. We utilize Chandra archival data to identify 665 X-ray point sources and HST…
A tiny Galactic dust cloud projected onto NGC 3269?
B. Dirsch, T. Richtler, M. Gomez
We report on new observations obtained with the Magellan Clay-telescope of a tiny dust patch in the Sa-galaxy NGC 3269 in the Antlia galaxy cluster. It has already been suspected t…
The Globular Cluster System of NGC 1399 IV. Some noteworthy objects
T. Richtler, B. Dirsch, S. Larsen +2
We present 8 bright globular clusters and/or objects of less familiar nature which we found in the course of scrutinizing the globular cluster system of NGC 1399. These objects are…
A wide-field photometric study of the globular cluster system of NGC 4636
Boris Dirsch, Ylva Schuberth, Tom Richtler
We investigate the unusually rich cluster system of NGC4636 with wide-field Washington photometry. The globular cluster luminosity function can be followed roughly 1 mag beyond the…
The Outer Cluster System of NGC 1399: Preliminary Results
Y. Schuberth, T. Richtler, B. Dirsch +2
We present preliminary results of our dynamical study of the outer globular cluster system of NGC 1399, the central galaxy in the Fornax Cluster. About 160 new radial velocities fo…
The Globular Cluster System of NGC 1399: III. VLT Spectroscopy and Database
B. Dirsch, T. Richtler, D. Geisler +9
Radial velocities of 468 globular clusters around NGC 1399, the central galaxy in the Fornax cluster, have been obtained with FORS2 and the Mask Exchange Unit (MXU) at the ESO Very…
The Globular Cluster System of NGC 1399. II. Kinematics of a Large Sample of Globular Clusters
T. Richtler, B. Dirsch, K. Gebhardt +9
We study the kinematics and dynamics of the globular cluster system of NGC 1399, the central galaxy of the Fornax cluster. The observational data consists of medium resolution spec…
The Globular Cluster Systems of NGC 3258 and NGC 3268 in the Antlia Cluster
B. Dirsch, T. Richtler, L. P. Bassino
The Antlia galaxy cluster is the third nearest galaxy cluster after Virgo and Fornax. We used the wide-field MOSAIC camera of the 4-m CTIO telescope to search in the brightest clus…
The Globular Cluster System of NGC 1399. I. A Wide-field Photometric Study
Boris Dirsch, Tom Richtler, Doug Geisler +3
We present a photometric investigation of the globular cluster population of NGC 1399, the central galaxy in the Fornax cluster, in Washington C and Kron R filters within a field o…
Globular cluster candidates within the Fornax Cluster: intracluster globulars?
L. P. Bassino, S. A. Cellone, J. C. Forte +1
We present the results of a search for globular clusters in the surroundings of 15 low surface brightness dwarf galaxies belonging to the Fornax Cluster, which was carried out on C…
Evidence for Blow-out in the Low-mass Dwarf Galaxy Holmberg I
Juergen Ott, Fabian Walter, Elias Brinks +3
We present radio and optical observations of Holmberg I (HoI), a member of the M81 group of galaxies (distance 3.6Mpc). HoI is a low-mass, low surface- brightness dwarf galaxy. Hig…
The Outer Halo Cluster System of NGC 1399
B. Dirsch, D. Geisler, T. Richtler +1
We investigate the outer halo globular cluster population of NGC 1399. This study uses wide-field imaging of this cluster system, which covers the largest area studied with CCD pho…
Spectroscopy of Globular Clusters in NGC 1399 - A Progress Report
T. Richtler, B. Dirsch, D. Geisler +9
We performed spectroscopy of globular clusters associated with NGC 1399 and measured radial velocities of more than 400 clusters, the largest sample ever obtained for dynamical stu…
Optical observations of the black hole candidate XTE J1550-564 during the Sep/Oct 1998 outburst
C. Sanchez-Fernandez, A. J. Castro-Tirado, H. W. Duerbeck +11
We report here optical observations during the September/October 1998 outburst of the black hole candidate XTE J1550-564. CCD photometry was obtained for the optical counterpart wi…
Galactic Extinction from Colors and Counts of Field Galaxies in WFPC2 Frames: An Application to GRB 970228
Rosa A. Gonzalez, Andrew S. Fruchter, Boris Dirsch
We develop the ``simulated extinction method'' to measure average foreground Galactic extinction from field galaxy number-counts and colors. The method comprises simulating extinct…
The Opacity of Nearby Galaxies from Colors and Counts of Background Galaxies: I. The Synthetic Field Method and its Application to NGC 4536 and NGC 3664
Rosa A. Gonzalez, R. J. Allen, Boris Dirsch +3
We describe a new, direct method for determining the opacity of foreground galaxies which does not require any a priori assumptions about the spatial distribution or the reddening…