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Searching for OB-type pre-supernova binary companions inside supernova remnants
Neuhäuser, R.; Mugrauer, M.; Ankay, A. +5 more
We searched for OB-runaway stars inside supernova remnants (SNRs) as a pre-supernova binary companion. As the majority of massive stars are found in close binary systems, a runaway star ejected by the orbital energy after the supernova (SN) is expected to be found. Considering a binary mass fraction, q = 0.25-1.0, the runaway star is likely to hav…
Unexpected major geomagnetic storm caused by faint eruption of a solar trans-equatorial flux rope
Zhang, Qingmin; Ji, Haisheng; Su, Yingna +1 more
Some geomagnetic storms' solar origins are ambiguous, making them hard to predict. On March 23, 2023, a severe geomagnetic storm occurred, however, forecasts based on remote-sensing observations failed to predict it. Here, we show clear evidence that this storm originates from the eruption of a trans-equatorial, longitudinal and low-density magnet…
The KALEIDOSCOPE survey: a new strong and weak gravitational lensing view of the massive galaxy cluster MACS J1423.8+2404
Mahler, Guillaume; Jauzac, Mathilde; Ebeling, Harald +6 more
We present a combined strong and weak gravitational-lensing analysis of the massive galaxy cluster MACS J1423.8+2404 (
Euclid view of the dusty star-forming galaxies at ≳ detected in wide area submillimetre surveys
Cai, Zhen-Yi; Mitra, Dipanjan; Negrello, Mattia +1 more
We investigate the constraints provided by the Euclid space observatory on the physical properties of dusty star-forming galaxies (DSFGs) at $z\gtrsim 1.5$ detected in wide area submillimetre surveys with Herschel. We adopt a physical model for the high-z progenitors of spheroidal galaxies, which form the bulk of DSFGs at $z\gtrsim 1.5$. We improv…
Detecting the Effect of Nonthermal Sources on the Warm-hot Galactic Halo
Das, Sanskriti
We report the first detection of nonthermal broadening of O VII lines in the warm-hot ≈106 K circumgalactic medium of the Milky Way. We use z = 0 absorption of O VII Kα, O VII Kβ, and O VIII Kα lines in archival grating data of b > 15° quasar sightlines from Chandra and XMM-Newton. Nonthermal line broadening is evident in two-thirds …
EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season
Chaffin, Michael S.; Halekas, Jasper S.; Brain, David A. +14 more
We present a comprehensive study of the nightside aurora phenomenon on Mars, utilizing observations from EMUS onboard Emirates Mars Mission. The oxygen emission at 130.4 nm is by far the brightest FUV auroral emission line observed at Mars. Our statistical analysis reveals geographic, solar zenith angle, local time, and seasonal dependencies of au…
Mapping Multiphase Metals in Star-forming Galaxies: A Spatially Resolved UV+Optical Study of NGC 5253
Kumari, Nimisha; Hernandez, Svea; Aloisi, Alessandra +4 more
We present a pioneering, spatially resolved, multiphase gas abundance study on the blue compact dwarf galaxy NGC 5253, targeting 10 star-forming (SF) clusters inside six far-UV (FUV) Hubble Space Telescope/Cosmic Origins Spectrograph (COS) pointings with cospatial optical Very Large Telescope/MUSE observations throughout the galaxy. The SF regions…
Recent advances in solar data-driven MHD simulations of the formation and evolution of CME flux ropes
Poedts, Stefaan; Schmieder, Brigitte; Guo, Jinhan
Filament eruptions and coronal mass ejections are physical phenomena related to magnetic flux ropes carrying electric current. A magnetic flux rope is a key structure for solar eruptions, and when it carries a southward magnetic field component when propagating to the Earth. It is the primary driver of strong geomagnetic storms. As a result, devel…
A comprehensive study of orbital evolution of LMC X-4: existence of a second derivative of the orbital period
Paul, Biswajit; Jain, Chetana; Sharma, Rahul
We report here results from pulse arrival time delay analysis of the eclipsing high-mass X-ray binary (HMXB) pulsar LMC X-4 using observations made with the Rossi X-ray Timing Explorer, XMM-Newton, NuSTAR (Nuclear Spectroscopic Telescope ARray), and AstroSat. Combining the orbital parameters determined from these observations with the historical m…
Binary central stars of planetary nebulae in the Large Magellanic Cloud
Soszyński, I.; Smolec, R.; Szczerba, R. +2 more
Context. Close binary central stars of planetary nebulae (PNe) must have formed through a common envelope evolution during the giant phase experienced by one of the stars. Transfer of the angular momentum from the binary system to the envelope leads to the shortening of the binary separations from the radius of red giant to the radius of the order…