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The photo-astrometric vertical tracer density of the Milky Way - II. Results from Gaia
Everall, Andrew; Boubert, Douglas; Grand, Robert J. J. +2 more
We use Gaia photometry and astrometry to estimate the vertical spatial structure of the Milky Way at the Solar radius, formally accounting for sample incompleteness (the selection function) and parallax measurement uncertainty. Our results show impressive precision demonstrating the power of the Gaia data. However, systematic errors dominate the p…
The evolution of temperature and density structures of OB cluster-forming molecular clumps
Liu, H. B.; Menten, K. M.; Csengeri, T. +4 more
Context. OB star clusters originate from parsec-scale massive molecular clumps, while individual stars may form in ≲0.1 pc scale dense cores. The thermal properties of the clump gas are key factors governing the fragmentation process, and are closely affected by gas dynamics and feedback of forming stars.
Aims: We aim to understand the evolut…
MADYS: the Manifold Age Determination for Young Stars. I. Isochronal age estimates and model comparison
Bonavita, M.; Squicciarini, V.
Context. The unrivalled astrometric and photometric capabilities of the Gaia mission have given new impetus to the study of young stars: both from an environmental perspective, as members of comoving star-forming regions, and from an individual perspective, as targets amenable to planet-hunting direct-imaging observations.
Aims: In view of th…
Two decades of X-ray observations of the isolated neutron star RX J1856.5 - 3754: detection of thermal and non-thermal hard X-rays and refined spin-down measurement
Mereghetti, Sandro; Turolla, Roberto; Tiengo, Andrea +6 more
The soft X-ray pulsar RX J1856.5 - 3754 is the brightest member of a small class of thermally emitting, radio-silent, isolated neutron stars. Its X-ray spectrum is almost indistinguishable from a blackbody with $kT^\infty \approx {60}\, {\rm eV}$, but evidence of harder emission above $\sim {1}\, {\rm keV}$ has been recently found. We report on a …
Clustered star formation at early evolutionary stages. Physical and chemical analysis of the young star-forming regions ISOSS J22478+6357 and ISOSS J23053+5953
Galván-Madrid, R.; Henning, Th.; Beuther, H. +20 more
Context. The process of high-mass star formation during the earliest evolutionary stages and the change over time of the physical and chemical properties of individual fragmented cores are still not fully understood.
Aims: We aim to characterize the physical and chemical properties of fragmented cores during the earliest evolutionary stages i…
Genesis and Coronal-jet-generating Eruption of a Solar Minifilament Captured by IRIS Slit-raster Spectra
Tiwari, Sanjiv K.; De Pontieu, Bart; Panesar, Navdeep K. +2 more
We present the first Mg II slit-raster spectra from the Interface Region Imaging Spectrograph (IRIS) that fully capture the genesis and coronal-jet-generating eruption of a central-disk solar minifilament. The minifilament arose in a negative-magnetic-polarity coronal hole. The Mg II spectroheliograms verify that the minifilament plasma temperatur…
MUSE-ALMA haloes VII: survey science goals & design, data processing and final catalogues
Hayes, M.; Kacprzak, G. G.; Kuntschner, H. +16 more
The gas cycling in the circumgalactic regions of galaxies is known to be multi-phase. The MUSE-ALMA Haloes survey gathers a large multi-wavelength observational sample of absorption and emission data with the goal to significantly advance our understanding of the physical properties of such CGM gas. A key component of the MUSE-ALMA Haloes survey i…
The Influence of Crustal Magnetic Fields on the Martian Bow Shock Location: A Statistical Analysis of MAVEN and Mars Express Observations
Garnier, P.; Génot, V.; Halekas, J. S. +6 more
Previous missions underlined the complex influence of the crustal magnetic fields on the Martian environment, including the plasma boundaries. Their influence on the bow shock is however poorly constrained, with most studies showing North/South differences attributed to the crustal fields, with various conclusions from little to strong variabiliti…
Multi-instrument STIX microflare study
Krucker, Säm; Veronig, Astrid M.; Podladchikova, Tatiana +7 more
Context. During its commissioning phase in 2020, the Spectrometer/Telescope for Imaging X-rays (STIX) on board the Solar Orbiter spacecraft observed 69 microflares. The two most significant events from this set (of GOES class B2 and B6) were observed on-disk from the spacecraft as well as from Earth and analysed in terms of the spatial, temporal, …
Ultrafaint Dwarf Galaxy Candidates in the M81 Group: Signatures of Group Accretion
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +8 more
The faint and ultrafaint dwarf galaxies in the Local Group form the observational bedrock upon which our understanding of small-scale cosmology rests. In order to understand whether this insight generalizes, it is imperative to use resolved-star techniques to discover similarly faint satellites in nearby galaxy groups. We describe our search for u…