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Kinematics of the Magellanic Stream and Implications for Its Ionization
Richter, Philipp; Bland-Hawthorn, Joss; Fox, Andrew J. +3 more
The Magellanic Stream and the Leading Arm form a massive, filamentary system of gas clouds surrounding the Large and Small Magellanic Clouds. Here we present a new component-level analysis of their ultraviolet (UV) kinematic properties using a sample of 31 sightlines through the Magellanic System observed with the Hubble Space Telescope/Cosmic Ori…
5D memberships and fundamental properties of the old open cluster NGC 6791 based on Gaia
Gao, Xinhua
This paper investigates reliable memberships and fundamental astrophysical properties of the old (∼8 Gyr) open cluster NGC 6791 using the astrometric and photometric data of the Gaia data release 2 (
The WAGGS project-III. Discrepant mass-to-light ratios of Galactic globular clusters at high metallicity
Martocchia, S.; Da Costa, G. S.; Usher, C. +10 more
Observed mass-to-light ratios (M/L) of metal-rich globular clusters (GCs) disagree with theoretical predictions. This discrepancy is of fundamental importance since stellar population models provide the stellar masses that underpin most of extragalactic astronomy, near and far. We have derived radial velocities for 1622 stars located in the centre…
High-resolution X-ray spectroscopy of the stellar wind in Vela X-1 during a flare
Bianchi, S.; Guainazzi, M.; Grinberg, V. +8 more
Context. We present a ~130 ks observation of the prototypical wind-accreting, high-mass X-ray binary Vela X-1 collected with XMM-Newton at orbital phases between 0.12 and 0.28. A strong flare took place during the observation that allows us to investigate the reaction of the clumpy stellar wind to the increased X-ray irradiation.
Aims: To exa…
Reflection component in the Bright Atoll Source GX 9+9
Sanna, A.; Di Salvo, T.; Burderi, L. +5 more
Context. GX 9+9 (4U 1728-16) is a low mass X-ray binary source harboring a neutron star. Although it belongs to the subclass of the bright Atoll sources together with GX 9+1, GX 3+1, and GX 13+1, its broadband spectrum is poorly studied and apparently does not show reflection features in the spectrum.
Aims: To constrain the continuum well and…
Outstanding questions in magnetospheric plasma physics: The pollenzo view
Stepanova, Marina; Hesse, Michael; Delzanno, Gian Luca +6 more
Based on discussions held at a workshop in Bra-Pollenzo, Italy, this paper elaborates upon 19 outstanding questions of plasma physics in the Earth's magnetosphere. The questions are grouped according to (a) driving processes, (b) radiation belt and ring current issues, (c) auroral physics, (d) internal plasma processes, and (e) magnetosphere-ionos…
Chromosome maps of young LMC clusters: an additional case of coeval multiple populations
Martocchia, S.; Dalessandro, E.; Salaris, M. +9 more
Recent studies have revealed that the multiple populations (MPs) phenomenon does not occur only in ancient and massive Galactic globular clusters (GCs), but it is also observed in external galaxies, where GCs sample a wide age range with respect to the Milky Way. However, for a long time, it was unclear whether we were looking at the same phenomen…
X-ray absorption in INTEGRAL active galactic nuclei. Host galaxy inclination
Ubertini, P.; Malizia, A.; Bassani, L. +2 more
In this work the INTEGRAL hard X-ray selected sample of active galactic nuclei (AGN) has been used to investigate the possible contribution of absorbing material distributed within the host galaxies to the total amount of NH measured in the X-ray band. We collected all the available axial ratio measurements of the galaxies hosting our A…
An Accreting, Anomalously Low-mass Black Hole at the Center of Low-mass Galaxy IC 750
Gelfand, Joseph D.; Chen, Yan-Ping; Greenhill, Lincoln J. +5 more
We present a multiwavelength study of the active galactic nucleus in the nearby (D = 14.1 Mpc) low-mass galaxy IC 750, which has circumnuclear 22 GHz water maser emission. The masers trace a nearly edge-on, warped disk ∼0.2 pc in diameter, coincident with the compact nuclear X-ray source that lies at the base of the ∼kiloparsec-scale extended X-ra…
A MeerKAT survey of nearby nova-like cataclysmic variables
Knigge, C.; Heywood, I.; Wijers, R. A. M. J. +17 more
We present the results of MeerKAT radio observations of 11 nearby nova-like cataclysmic variables (CVs). We have detected radio emission from IM Eri, RW Sex, V3885 Sgr, and V603 Aql. While RW Sex, V3885 Sgr, and V603 Aql had been previously detected, this is the first reported radio detection of IM Eri. Our observations have doubled the sample of …