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SMASHing the low surface brightness SMC
Bell, Eric F.; Monachesi, Antonela; Choi, Yumi +22 more
The periphery of the Small Magellanic Cloud (SMC) can unlock important information regarding galaxy formation and evolution in interacting systems. Here, we present a detailed study of the extended stellar structure of the SMC using deep colour-magnitude diagrams, obtained as part of the Survey of the MAgellanic Stellar History (SMASH). Special ca…
Onset of Turbulent Fast Magnetic Reconnection Observed in the Solar Atmosphere
Chitta, L. P.; Lazarian, A.
Fast magnetic reconnection powers explosive events throughout the universe, from gamma-ray bursts to solar flares. Despite its importance, the onset of astrophysical fast reconnection is the subject of intense debate and remains an open question in plasma physics. Here we report high-cadence observations of two reconnection-driven solar microflare…
The solar wind from a stellar perspective. How do low-resolution data impact the determination of wind properties?
Güdel, M.; Airapetian, V. S.; Jin, M. +5 more
Context. Due to the effects that they can have on the atmospheres of exoplanets, stellar winds have recently received significant attention in the literature. Alfvén-wave-driven 3D magnetohydrodynamic models, which are increasingly used to predict stellar wind properties, contain unconstrained parameters and rely on low-resolution stellar magnetog…
Globular Cluster Systems and Galaxy Formation
Beasley, Michael A.
Globular clusters (GCs) are compact, gravitationally bound systems of up to ∼¼1 million stars. The GCs in the Milky Way contain some of the oldest stars known, and provide important clues to the early formation and continuing evolution of our Galaxy. More generally, GCs are associated with galaxies of all types and masses, from low-mass dwarf gala…
Time-resolved photometry of the young dipper RX J1604.3-2130A. Unveiling the structure and mass transport through the innermost disk
Bouvier, J.; Manara, C. F.; Pinilla, P. +3 more
Context. RX J1604.3-2130A is a young, dipper-type, variable star in the Upper Scorpius association, suspected to have an inclined inner disk, with respect to its face-on outer disk.
Aims: We aim to study the eclipses to constrain the inner disk properties.
Methods: We used time-resolved photometry from the Rapid Eye Mount telescope and K…
Crystalline silicate absorption at 11.1 µm: ubiquitous and abundant in embedded YSOs and the interstellar medium
Wright, Christopher M.; Fujiyoshi, Takuya; Siebenmorgen, Ralf +5 more
Utilizing several instruments on 4-8 m telescopes, we have observed a large sample of objects in the mid-infrared (8-13 µm). These comprise a few evolved stars, multiple envelopes of embedded young stellar objects (YSOs) or compact H-II regions, and several sightlines through the interstellar medium (ISM). The latter is where dust resides - …
The frequency of extreme X-ray variability for radio-quiet quasars
Brandt, W. N.; Liu, H.; Luo, B. +3 more
We analyse 1598 serendipitous Chandra X-ray observations of 462 radio-quiet quasars to constrain the frequency of extreme amplitude X-ray variability that is intrinsic to the quasar corona and innermost accretion flow. The quasars in this investigation are all spectroscopically confirmed, optically bright (mi ≤ 20.2), and contain no ide…
The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster
Zhang, Hongxin; Liu, Chengze; Gwyn, Stephen +26 more
We present a study of ultracompact dwarf (UCD) galaxies in the Virgo cluster based mainly on imaging from the Next Generation Virgo Cluster Survey (NGVS). Using ∼100 deg2 of u*giz imaging, we have identified more than 600 candidate UCDs, from the core of Virgo out to its virial radius. Candidates have been selected through a combination…
A Tidal Disruption Event Candidate Discovered in the Active Galactic Nucleus SDSS J022700.77-042020.6
Lu, Youjun; Liu, Zhu; Yuan, Weimin +4 more
We report the discovery of a tidal disruption event (TDE) candidate occurring in the active galactic nucleus (AGN) SDSS J022700.77-042020.6. A sudden increase in flux from J0227-0420 during the second half of 2009 appears in the long-term optical, UV, and near-IR (NIR) light curves. A plateau phase, following an initial decline, is seen in the nea…
Bar resonances and low angular momentum moving groups in the Galaxy revealed by their stellar ages
Laporte, Chervin F. P.; Famaey, Benoit; Gerhard, Ortwin +3 more
We use the second Gaia data release to dissect the Milky Way disc in phase-space and relative ages. We confirm and report the existence of multiple velocity moving groups at low azimuthal velocities and angular momenta, below Arcturus, regularly separated by ∼18-20 km s-1 in azimuthal velocity. Such features were predicted to exist more…