Search Publications
LeMMINGs. V. Nuclear activity and bulge properties: A detailed multi-component decomposition of e-MERLIN Palomar galaxies with HST
Argo, M. K.; Gallagher, J. S.; Knapen, J. H. +12 more
We used high-resolution HST imaging and e-MERLIN 1.5-GHz observations of galaxy cores from the LeMMINGs survey to investigate the relation between optical structural properties and nuclear radio emission for a large sample of galaxies. We performed accurate, multi-component decompositions of new surface brightness profiles extracted from HST image…
Diffuse solar coronal features and their spicular footpoints
Peter, H.; Chitta, L. P.; Milanović, N.
Context. In addition to a component of the emission that originates from clearly distinguishable coronal loops, the solar corona also exhibits extreme-ultraviolet (EUV) and X-ray ambient emission that is rather diffuse and is often considered undesirable background. Importantly, unlike the generally more structured transition region and chromosphe…
A multi-band AGN-SFG classifier for extragalactic radio surveys using machine learning
Wang, L.; Vaccari, M.; Morganti, R. +7 more
Context. Extragalactic radio continuum surveys play an increasingly more important role in galaxy evolution and cosmology studies. While radio galaxies and radio quasars dominate at the bright end, star-forming galaxies (SFGs) and radio-quiet active galactic nuclei (AGNs) are more common at fainter flux densities.
Aims: Our aim is to develop …
eRASSt J040515.6 − 745202, an X-ray burster in the Magellanic Bridge
Haberl, F.; Ray, P. S.; Ducci, L. +13 more
Context. During the third all-sky survey (eRASS3), eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma, detected a new hard X-ray transient, eRASSt J040515.6 − 745202, in the direction of the Magellanic Bridge.
Aims: We arranged follow-up observations and searched for archival data to reveal the nature of the transient.
Met…
Dark halos around solar active regions. I. Emission properties of the dark halo around NOAA 12706
Andretta, V.; Del Zanna, G.; Murabito, M. +1 more
Context. Dark areas around active regions (ARs) were first observed in chromospheric lines more than a century ago and are now associated with the Hα fibril vortex around ARs. Nowadays, large areas surrounding ARs with reduced emission relative to the quiet Sun (QS) are also observed in spectral lines emitted in the transition region (TR) and the …
Serendipitous discovery of the magnetic cataclysmic variable SRGE J075818−612027
Brink, Jaco; Buckley, David A. H.; Schwope, Axel +5 more
We report the discovery of SRGE J075818−612027, a deep stream-eclipsing magnetic cataclysmic variable found serendipitously in SRG/eROSITA calibration and performance verification phase (CalPV) observations of the open cluster NGC 2516 as an unrelated X-ray source. An X-ray timing and spectral analysis of the eROSITA data is presented and suppleme…
Plausible association of distant late M dwarfs with low-frequency radio emission
Callingham, J. R.; Shimwell, T. W.; Hardcastle, M. J. +10 more
We present the serendipitous discovery of eight distant (> 50 pc) late M dwarfs with plausible associated radio emission at 144 MHz. The M-dwarf nature of our sources has been confirmed with optical spectroscopy performed using HET/LRS2 and Subaru/FOCAS, and their radio flux densities are within the range of 0.5−1.0 mJy at 144 MHz. Considering …
Estimating the energy flux of transverse waves associated with Kelvin-Helmholtz instability in solar coronal loops
Guo, Mingzhe; Gao, Yuhang; Van Doorsselaere, Tom +1 more
Context. The energy flux of kink waves in coronal loops has been estimated in previous studies. Recent numerical simulations have revealed that kink oscillations can induce a Kelvin-Helmholtz Instability (KHI) in magnetic flux tubes. This non-linear process breaks the assumptions that have typically been included in previous eigenmode analyses. Th…
Cometary dust collected by MIDAS on board Rosetta. II. Particle shape descriptors and pristineness evaluation
Lasue, J.; Bentley, M. S.; Mannel, T. +4 more
Context. The MIDAS (Micro-Imaging Dust Analysis System) atomic force microscope on board the Rosetta comet orbiter investigated and measured the 3D topography of a few hundred of nm to tens of µm sized dust particles of 67P/Churyumov-Gerasimenko with resolutions down to a few nanometers, giving insights into the physical processes of our ear…
Deriving physical parameters of unresolved star clusters. VII. Adaptive aperture photometry of the M 31 PHAT star clusters
Stonkutė, Rima; Vansevičius, Vladas; Kriščiūnas, Eimantas +1 more
Context. This work is the seventh study in a series dedicated to investigating degeneracies of simultaneous age, mass, extinction, and metallicity determinations of partially resolved or unresolved star clusters with Hubble Space Telescope broadband aperture photometry. In the sixth work (hereafter, Paper I), it was demonstrated that the adaptive …