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General relativistic magnetohydrodynamic simulations with general relativistic radiative transfer reproduce remarkably well the broadband spectrum and morphology of the innermost jet of M87, allowing some first rough constraints on the spin of M87*.
Up to 40% of ultra-diffuse galaxies could have formed via stripping of material by ram pressure. A study on 11 low-mass post-starburst galaxies in the Coma and Abell 2147 clusters shows ubiquitous marks of ram-pressure stripping and recent star formation, and most of them will evolve into ultra-diffuse galaxies in the next 10 Gyr.
Wet chemistry experiments performed in situ by the Curiosity rover in the sand of Bagnold Dunes detected an array of organic molecules including aromatic benzoic acid, nitrogen-bearing organics and other unidentified compounds.
As the Perseverance rover landed on the Martian surface, the sensors on NASA’s InSight Mars lander picked up no seismic or acoustic waves. This non-detection provides information on the crust and atmosphere of Mars.
A sensitive Breakthrough Listen search for technosignatures towards Proxima Centauri has resulted in a viable narrowband signal. The observational approach, using the Parkes Murriyang telescope, is described here, while the signal of interest is analysed in a companion paper by Sheikh et al.
A radio signal detected in the direction of Proxima Centauri in a Breakthrough Listen programme is analysed for signs that it was transmitted by extraterrestrial intelligent life, using a newly developed framework. However, the signal ‘blc1’ is likely to be terrestrial radio-frequency interference.
A brightness dip in the extragalactic X-ray binary M51-ULS-1 can be well fit by a planet transit model in which the eclipser is most likely Saturn-sized. The locations of possible orbits are consistent with the survival of a planet bound to a mass-transfer binary.
A population study of near-infrared spectra of 19 hot giant planets shows a correlation between the strength of the 1.4 μm water band and temperature, which is broadly regulated by irradiation. However, the observed scatter around the mean is indicative of the effect of individual planetary formation pathways on the composition.
From its optical light curve, the white dwarf in the binary system TW Pictoris appears to be switching between two different intensities of accretion on timescales of hours. This behaviour is reminiscent of that seen in transitional millisecond pulsars, where the switching occurs several times a minute.
Globular cluster NGC 2005 in the Large Magellanic Cloud (LMC) bears the elemental hallmarks of being an accreted object: a surviving fragment of a galaxy that fell into the LMC long enough ago to have erased any dynamical signature of accretion.
LOFAR observations of a galaxy group reveal multiple generations of cosmic-ray bubbles. The bubble buoyancy power offsets the radiative cooling of the intragroup medium, while magnetic fields prevent mixing between the bubbles and the external medium.
While pulsar timing observations are currently unable to distinguish a binary black hole astrophysical foreground from a cosmological background, integrated bounds on the ultra-low-frequency gravitational wave spectrum from other cosmological probes may help to break this degeneracy.
The authors present 19 detections of coherent low-frequency radio emission from M dwarfs using the Low Frequency Array. The sample includes both chromospherically active and quiescent stars, but radio luminosities are independent of coronal and chromospheric activity indicators.
The impact flux in the inner Solar System just after its formation is studied by looking at the highly siderophile element abundance of Vesta. Results show that leftover planetesimals from the terrestrial planet region have been the major impactor source, indicative of a skewed mass distribution in the primordial inner Solar System.
Basalt samples from the Moon gathered during the Apollo 17 mission hold information on the lunar magnetic field as it was 3.7 billion years ago. Its mean intensity was ~50 μT and its inclination 34 ± 10°. Such results suggest that the lunar dynamo was active at the time and was axially aligned and dipolar.
[C ii] 158 μm emission associated with a strong low-ionization absorber at z = 5.978 indicates a dark matter halo mass of around 4 × 1011 solar masses, one to two orders of magnitude more massive than typical values predicted from cosmological simulations.