Search Publications
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…
The Hubble PanCET Program: A Featureless Transmission Spectrum for WASP-29b and Evidence of Enhanced Atmospheric Metallicity on WASP-80b
Deming, Drake; Mikal-Evans, Thomas; Sing, David K. +19 more
We present a uniform analysis of transit observations from the Hubble Space Telescope and Spitzer Space Telescope of two warm gas giants orbiting K-type stars-WASP-29b and WASP-80b. The transmission spectra, which span 0.4-5.0 µm, are interpreted using a suite of chemical equilibrium PLATON atmospheric retrievals. Both planets show evidence …
Constraints on Cosmological Parameters with a Sample of Type Ia Supernovae from JWST
Koekemoer, Anton M.; Baade, Dietrich; Wang, Lifan +7 more
We investigate the potential of using a sample of very high-redshift (2 ≲ z ≲ 6) (VHZ) Type Ia supernovae (SNe Ia) attainable by JWST on constraining cosmological parameters. At such high redshifts, the age of the universe is young enough that the VHZ SN Ia sample comprises the very first SNe Ia of the universe, with progenitors among the very fir…
New Constraints on the Dark Matter Density Profiles of Dwarf Galaxies from Proper Motions of Globular Cluster Streams
Malhan, Khyati; Ibata, Rodrigo A.; Valluri, Monica +1 more
The central density profiles in dwarf galaxy halos depend strongly on the nature of dark matter (DM). Recently, in Malhan et al. we employed N-body simulations to show that the cuspy cold DM subhalos predicted by cosmological simulations can be differentiated from cored subhalos using the properties of accreted globular cluster (GC) streams since …