Search Publications
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…
Estimate of Water and Hydroxyl Abundance on Asteroid (16) Psyche from JWST Data
Woodward, Charles E.; Rivkin, Andrew S.; Müller, Thomas G. +10 more
Our understanding of solar system evolution is closely tied to interpretations of asteroid composition, particularly the M-class asteroids. These asteroids were initially thought to be the exposed cores of differentiated planetesimals, a hypothesis based on their spectral similarity to iron meteorites. However, recent astronomical observations hav…
A Possible Correlation between Metallicity and Near-IR Color for Late-M and L Dwarfs
Liu, Michael C.; Zhang, Zhoujian; Zhang, Ruihan
We examine the relationship between metallicity and J - K color for 64 benchmark late-M and L dwarfs, all of which are wide companions to higher-mass stars, and six of which are new discoveries. We assess the correlation between the Δ(J - K) color anomaly (the difference in an object's J - K color from the median color for field objects of the sam…
Rapid variability of Markarian 421 during extreme flaring as seen through the eyes of XMM-Newton
Nowak, M. A.; Walter, R.; Dauser, T. +31 more
By studying the variability of blazars across the electromagnetic spectrum, it is possible to resolve the underlying processes responsible for rapid flux increases, so-called flares. We report on an extremely bright X-ray flare in the high-peaked BL Lacertae object Markarian 421 (Mrk 421) that occurred simultaneously with enhanced γ-ray activity d…