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Tidally stripped halo stars from the Large Magellanic Cloud in the Galactic North
Peñarrubia, Jorge; Petersen, Michael S.; Jones, Ella
We examine whether the Large Magellanic Cloud (LMC) is currently losing its stellar halo to Milky Way (MW) tides. We present a live N-body model for the ongoing MW-LMC interaction that predicts a prominent stream of stars tidally stripped from the progenitor LMC. We use this model to define a strategy to search for stripped material in kinematic s…
Deep study of A399-401: Application of a wide-field facet calibration
Brunetti, G.; Shimwell, T. W.; Tasse, C. +6 more
Context. Diffuse synchrotron emission pervades numerous galaxy clusters, indicating the existence of cosmic rays and magnetic fields throughout the intra-cluster medium. The general consensus is that this emission is generated by shocks and turbulence that are activated during cluster merger events and cause a (re-)acceleration of particles to hig…
Can We Detect Coronal Mass Ejections through Asymmetries of Sun-as-a-star Extreme-ultraviolet Spectral Line Profiles?
Chen, Yajie; Gao, Yuhang; Tian, Hui +8 more
Coronal mass ejections (CMEs) are the largest-scale eruptive phenomena in the solar system. Associated with enormous plasma ejections and energy releases, CMEs have an important impact on the solar-terrestrial environment. Accurate predictions of the arrival times of CMEs at the Earth depend on precise measurements of their 3D velocities, which ca…
A Multiwavelength View of IC 860: What Is in Action inside Quenching Galaxies
Heckman, Timothy; Aalto, Susanne; French, K. Decker +15 more
We present a multiwavelength study of IC 860, a nearby post-starburst galaxy at the early stage of transitioning from blue and star forming to red and quiescent. Optical images reveal a galaxy-wide, dusty outflow originating from a compact core. We find evidence for a multiphase outflow in the molecular and neutral gas phase from the CO position-v…
Modelling the stellar halo with RR-Lyrae stars
Li, Chengdong; Binney, James
A seven-parameter distribution function (DF) is fitted to $20\, 000$ RR-Lyrae stars for which only astrometric data are available. The observational data are predicted by the DF in conjunction with the gravitational potential of a self-consistent model Galaxy defined by DFs for the dark halo, the bulge, and a four-component disc. Tests of the tech…
Atmospheric mass-loss and stellar wind effects in young and old systems - I. Comparative 3D study of TOI-942 and TOI-421 systems
Carleo, Ilaria; Vidotto, Aline A.; Kubyshkina, Daria +3 more
At young ages, when radiation from the host star is high, and the planet is hot and inflated after formation, planetary atmospheric mass-loss can be extremely strong compared to older planets. In turn, stellar winds are faster and denser for young stars compared to evolved main-sequence stars. Their interaction with escaping planetary atmospheres …
Eruption and Interplanetary Evolution of a Stealthy Streamer-Blowout CME Observed by PSP at ∼0.5 AU
Lynch, Benjamin J.; Palmerio, Erika; Stevens, Michael L. +5 more
Streamer-blowout coronal mass ejections (SBO-CMEs) are the dominant CME population during solar minimum. Although they are typically slow and lack clear low-coronal signatures, they can cause geomagnetic storms. With the aid of extrapolated coronal fields and remote observations of the off-limb low corona, we study the initiation of an SBO-CME pre…
Lyα Halos around [O III]-selected Galaxies in HETDEX
Finkelstein, Steven L.; Schneider, Donald P.; Gebhardt, Karl +13 more
We present extended Lyα emission out to 800 kpc of 1034 [O III]-selected galaxies at redshifts 1.9 < z < 2.35 using the Hobby-Eberly Telescope Dark Energy Experiment. The locations and redshifts of the galaxies are taken from the 3D-HST survey. The median-stacked surface brightness profile of the Lyα emission of the [O III]-selected galaxies…
The Donor of the Black Hole X-Ray Binary MAXI J1820+070
Mikołajewska, Joanna; Casares, Jorge; Zdziarski, Andrzej A. +2 more
We estimate the parameters of the donor of the accreting black hole binary MAXI J1820+070. The measured values of the binary period, rotational and radial velocities, and constraints on the orbital inclination imply the donor is a subgiant with the mass of ${M}_{2}\approx {0.49}_{-0.10}^{+0.10}{M}_{\odot }$ and the radius of ${R}_{2}\approx {1.19}…
A first glimpse at the line-of-sight structure of the Milky Way's nuclear stellar disc
Nogueras-Lara, F.
Context. The nuclear stellar disc (NSD) is a dense stellar structure at the centre of our Galaxy. Given its proximity, it constitutes a unique laboratory to understand other galactic nuclei. Nevertheless, the high crowding and extinction hamper its study, and even its morphology and kinematics are not yet totally clear.
Aims: In this work we …