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The Milky Way Bulge Extra-tidal Star Survey: BH 261 (AL 3)
Clarkson, William I.; Kunder, Andrea; Johnson, Christian I. +19 more
The Milky Way Bulge extra-tidal star survey is a spectroscopic survey with the goal of identifying stripped globular cluster stars from inner Galaxy clusters. In this way, an indication of the fraction of metal-poor bulge stars that originated from globular clusters can be determined. We observed and analyzed stars in and around BH 261, an underst…
The mass distribution of stellar mergers: A new scenario for several FS CMa stars
Korčáková, D.; Kroupa, P.; Dvořáková, N. +1 more
Context. FS CMa stars belong to a diverse group of stars exhibiting the B[e] phenomenon, which manifests itself mainly by the presence of forbidden emission lines and a strong infrared (IR) excess in their spectra. Only a few tens of FS CMa stars are known and their nature is still unclear. Recently, a strong magnetic field has been discovered in …
Cygnus A obscuring torus: ionized, atomic, or molecular?
Ogle, Patrick; Antonucci, Robert; Bagul, Atharva +2 more
The prototypical powerful FR II radio galaxy Cygnus A fits extremely well into the quasar/radio galaxy unified model: high polarization with an angle almost perpendicular to the radio jet and polarized flux showing broad permitted lines. It has been claimed that ionized gas in the torus reveals a very clear torus shape via Bremmstrahlung emission.…
The MUSE Ultra Deep Field (MUDF). VI. The Relationship between Galaxy Properties and Metals in the Circumgalactic Medium
Rafelski, Marc; Beckett, Alexander; Fumagalli, Michele +10 more
We present initial results associating galaxies in the Multi-Unit Spectroscopic Explorer (MUSE) Ultra Deep Field (MUDF) with gas seen in absorption along the line of sight to two bright quasars in this field to explore the dependence of metals in the circumgalactic medium (CGM) on galaxy properties. The MUDF includes ∼140 hr of Very Large Telescop…
Discovery of a new IW And-type dwarf nova with both tilted disc and tidal instability
Shi, Jianrong; Huang, Yang; Liu, Jifeng +6 more
IW And-type dwarf novae are anomalous Z Cam stars featured with outbursts happening during standstill states, which are not expected in the standard disc instability model. The physical mechanisms for these variations remain unclear. In this study, we report the discovery of a new candidate IW And-type dwarf nova J0652+2436, identified with its fr…
On the mass assembly history of the Milky Way: clues from its stellar halo
Horta, Danny; Schiavon, Ricardo P.
Stellar halos of galaxies retain crucial clues to their mass assembly history. It is in these galactic components that the remains of cannibalised galactic building blocks are deposited. For the case of the Milky Way, the opportunity to analyse the stellar halo's structure on a star-by-star basis in a multi-faceted approach provides a basis from w…
Detection of the neutral iron line from the supernova remnant W 49 B with Suzaku
Katsuda, Satoru; Nobukawa, Masayoshi; Nobukawa, Kumiko K. +2 more
Recent studies of supernova remnants (SNRs) have revealed that some SNRs exhibit a neutral iron line emission at 6.4 keV. This line has been proposed to originate from the interaction of high-energy particles formed in the SNR shell with the surrounding cold matter. We searched for the neutral iron line emission in the SNR W 49 B. Significant dete…
Modeling of the Polytropic Index and Temperature Anisotropy in the Solar Wind
Engelbrecht, N. E.; Strauss, R. D.; Desta, Ephrem Tesfaye
The polytropic index is a fundamental physical parameter related to the thermodynamic processes present in space and astrophysical plasmas. This paper investigates the theoretical relationship between the polytropic index and the temperature anisotropy for flow parameters relevant to space plasmas. The derivation is based on the Chew–Goldberger–Lo…
Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps
Li, Dalei; Tang, Xindi; Zhou, Jianjun +7 more
We study the magnetic field structures in six giant filaments associated with the spiral arms of the Milky Way by applying the velocity gradient technique (VGT) to the 13CO spectroscopic data from the GRS, FUGIN, and SEDIGSM surveys. Unlike dust-polarized emission, the VGT allows us to separate the foreground and background using the ve…
Comets, sliding of surface dust on illuminated surfaces
Kossacki, Konrad J.; Wesołowski, Marcin; Mikołajków, Tomasz +1 more
In our paper we presented the results of our laboratory experiments dealing with the formation and sliding of the desiccated nonvolatile granular material down the samples of potential cometary analogs. The studied samples were composed of porous aggregates containing water ice, quartz sand and charcoal. Their surfaces were initially free of desic…