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18 papers · 2 filters
Current data on the globular cluster Palomar 14 are not inconsistent with MOND
Gianfranco Gentile, Benoit Famaey, Garry W. Angus +1
Certain types of globular clusters have the very important property that the predictions for their kinematics in the Newtonian and modified Newtonian dynamics (MOND) contexts are d…
A New Mechanism for Radial Migration in Galactic Disks: Spiral-Bar Resonance Overlap
I. Minchev, B. Famaey
While it has long been known that a large number of short-lived transient spirals can cause stellar migration, here we report that another mechanism is also effective at mixing dis…
Testing Newtonian Gravity with AAOmega: Mass-To-Light Profiles and Metallicity Calibrations From 47 Tuc and M55
Richard R. Lane, László L. Kiss, Geraint F. Lewis +4
Globular clusters are an important test bed for Newtonian gravity in the weak-acceleration regime, which is vital to our understanding of the nature of the gravitational interactio…
AMIGA project: Active galaxies in a complete sample of isolated galaxies
J. Sabater, S. Leon, L. Verdes-Montenegro +3
The project AMIGA (Analysis of the interstellar Medium of Isolated GAlaxies) provides a statistically significant sample of the most isolated galaxies in the northern sky. Such a c…
Deep Gemini/GMOS imaging of an extremely isolated globular cluster in the Local Group
A. D. Mackey, A. M. N. Ferguson, M. J. Irwin +7
We report on deep imaging of a remote M31 globular cluster, MGC1, obtained with Gemini/GMOS. Our colour-magnitude diagram for this object extends ~5 magnitudes below the tip of the…
Low-Velocity Streams in the Solar Neighborhood Caused by the Galactic Bar
I. Minchev, C. Boily, A. Siebert +1
We find that a steady state bar induces transient features at low velocities in the solar neighborhood velocity distribution due to the initial response of the disc, following the…
Testing Newtonian Gravity with AAOmega: Mass-to-Light Profiles of Four Globular Clusters
Richard R. Lane, László L. Kiss, Geraint F. Lewis +4
Testing Newtonian gravity in the weak-acceleration regime is vital to our understanding of the nature of the gravitational interaction. It has recently been claimed that the veloci…
Near-infrared spectroscopy of AGB star candidates in Fornax, Sculptor and NGC 6822
M. A. T. Groenewegen, A. Lancon, M. Marescaux
Context: The Asymptotic Giant Branch (AGB) phase is characterised by substantial mass loss that is accompanied by the formation of dust. In extreme cases this will make the star no…
Simultaneous Multi-Wavelength Observations of Sgr A* during 2007 April 1-11
F. Yusef-Zadeh, H. Bushouse, M. Wardle +18
We report the detection of variable emission from Sgr A* in almost all wavelength bands (i.e. centimeter, millimeter, submillimeter, near-IR and X-rays) during a multi-wavelength o…
A search for thermally emitting isolated neutron stars in the 2XMMp catalogue
Adriana M. Pires, Christian Motch, Eduardo Janot-Pacheco
The relatively large number of nearby radio-quiet and thermally emitting isolated neutron stars (INSs) discovered in the ROSAT All-Sky Survey, dubbed the ``Magnificent Seven'' (M7)…
Density and kinematic cusps in M54 at the heart of the Sagittarius dwarf galaxy: evidence for a 10^4 M_sun Black Hole?
R. Ibata, M. Bellazzini, S. C. Chapman +8
We report the detection of a stellar density cusp and a velocity dispersion increase in the center of the globular cluster M54, located at the center of the Sagittarius dwarf galax…
Candidate planetary nebulae in the IPHAS photometric catalogue
K. Viironen, R. Greimel, R. L. M. Corradi +12
Context. We have carried out a semi-automated search for planetary nebulae (PNe) in the INT Photometric H-Alpha Survey (IPHAS) catalogue. We present the PN search and the list of s…
Galactic kinematics with modified Newtonian dynamics
O. Bienaymé, B. Famaey, X. Wu +2
We look for observational signatures that could discriminate between Newtonian and modified Newtonian (MOND) dynamics in the Milky Way, in view of the advent of large astrometric a…
Radial mixing in the outer Milky Way disk caused by an orbiting satellite
Alice C. Quillen, Ivan Minchev, Joss Bland-Hawthorn +1
Using test particle simulations we examine the structure of the outer Galactic disk as it is perturbed by a satellite in a tight eccentric orbit about the Galaxy. A satellite of ma…
Potential-density pairs and vertical tilt of the stellar velocity ellipsoid
O. Bienaymé
We define new potential-density pairs and examine the impact of the potential flattening on the vertical velocity ellipsoid tilt, . By means of numerical integrations and analyt…
Is the Milky Way ringing? The hunt for high velocity streams
I. Minchev, A. C. Quillen, M. Williams +4
We perform numerical simulations of a stellar galactic disk with initial conditions chosen to represent an unrelaxed population which might have been left following a merger. Stars…
Evidence for X-ray synchrotron emission from simultaneous mid-IR to X-ray observations of a strong Sgr A* flare
K. Dodds-Eden, D. Porquet, G. Trap +22
This paper reports measurements of Sgr A* made with NACO in L' -band (3.80 um), Ks-band (2.12 um) and H-band (1.66 um) and with VISIR in N-band (11.88 um) at the ESO VLT, as well a…
The thermal-viscous disk instability model in the AGN context
Jean-Marie Hameury, Maxime Viallet, Jean-Pierre Lasota
Accretion disks in AGN should be subject to the same type of instability as in cataclysmic variables (CVs) or in low-mass X-ray binaries (LMXBs), which leads to dwarf nova and soft…