Search Publications
Evidence for the Disky Origin of Luminous Virgo Dwarf Ellipticals from the Kinematics of Their Globular Cluster Systems
Brodie, Jean P.; Beasley, Michael A.; Strader, Jay +1 more
We report evidence for dynamically significant rotation in the globular cluster systems of two luminous Virgo dwarf ellipticals, VCC1261 and VCC1528. Including previous results for VCC1087, the globular cluster systems of all three Virgo dwarf ellipticals studied in detail to date exhibit v rot/σlos>1. Taking the rotation …
GRI: focusing on the evolving violent universe
Knödlseder, Jürgen; Christensen, Finn; Bazzano, Angela +4 more
The gamma-ray imager (GRI) is a novel mission concept that will provide an unprecedented sensitivity leap in the soft gamma-ray domain by using for the first time a focusing lens built of Laue diffracting crystals. The lens will cover an energy band from 200-1,300 keV with an effective area reaching 600 cm2. It will be complemented by a…
Genetic inversion of sparse disk-integrated photometric data of asteroids: application to Hipparcos data
Mottola, S.; Tanga, P.; Cellino, A. +2 more
Context: The development of techniques for the inversion of sparse disk-integrated photometric data of asteroids is a very urgent task, due to the imminent commencements of large sky surveys from both space (Gaia) and the ground (Pan-STARRS).
Aims: We developed a numerical algorithm for the inversion of sparse photometric data of asteroids. An…
The Sub-Parsec Scale Radio Properties of Southern Starburst Galaxies. II. Supernova Remnants, the Supernova Rate, and the Ionised Medium in the NGC 4945 Starburst
Tingay, S. J.; Lenc, E.
Wide-field, very long baseline interferometry observations of the nearby starburst galaxy NGC 4945, obtained with the Australian Long Baseline Array, have produced 2.3 GHz images over two epochs with a maximum angular resolution of 15 mas (0.3 pc). Fifteen sources were detected, 13 of which correspond to sources identified in higher frequency (3 c…
Magnetic helicity accumulation and tilt angle evolution of newly emerging active regions
Zhang, H.; Yang, S.; Büchner, J.
Context: It has been known for years that there is a general dominance of negative (positive) helicity of active regions (ARs) in the northern (southern) solar hemisphere. For a better understanding of the role of helicity in the evolution of active regions, it is necessary to know more about the accumulation of helicity during the emergence of ac…
AKARI Detection of Far-Infrared Dust Emission in the Halo of NGC 253
Onaka, Takashi; Yamagishi, Mitsuyoshi; Kaneda, Hidehiro +1 more
We present new far-infrared (FIR) images of the edge-on starburst galaxy NGC 253 obtained with the Far-Infrared Surveyor (FIS) onboard AKARI at wavelengths of 90 µm and 140 µm. We have clearly detected FIR dust emission extended in the halo of the galaxy; there are two filamentary emission structures extending from the galactic disk up…
A forming disk at z ~ 0.6: collapse of a gaseous disk or major merger remnant?
Yang, Y.; Neichel, B.; Flores, H. +2 more
Context: Local spiral galaxies contain roughly two-thirds of the present-day stellar mass density. However, the formation process of disks is still poorly understood.
Aims: We present and analyze observations of J033241.88-274853.9 at z = 0.6679 to understand how its stellar disk was formed.
Methods: We combine multi-wavelength EIS, HST/AC…
The architecture of the GJ 876 planetary system. Masses and orbital coplanarity for planets b and c
Bean, J. L.; Seifahrt, A.
We present a combined analysis of previously published high-precision radial velocities and astrometry for the GJ 876 planetary system using a self-consistent model that accounts for the planet-planet interactions. Assuming the three planets so far identified in the system are coplanar, we find that including the astrometry in the analysis does no…
Geologic context of in situ rocky exposures in Mare Serpentis, Mars: Implications for crust and regolith evolution in the cratered highlands
Rogers, A. D.; Aharonson, O.; Bandfield, J. L.
Global acquisition of infrared spectra and high-resolution visible and infrared imagery has enabled the placement of compositional information within stratigraphic and geologic context. Mare Serpentis, a low albedo region located northwest of Hellas Basin, is rich in spectral and thermophysical diversity and host to numerous isolated exposures of …
XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J1037.5-5647 in a low luminosity state
Tiengo, A.; Mereghetti, S.; Sidoli, L. +2 more
The spectra of several X-ray binary pulsars display a clear soft excess, which in most cases can be described with a blackbody model, above the main power-law component. While in the high-luminosity sources it is usually characterized by low temperature (kT < 0.5 keV) and a large emission radius (R > 100 km), in the two persistent and low-lu…