Search Publications
Evidence for Low-power Radio Jet-ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395
Stalin, C. S.; Riffel, Rogemar A.; Nandi, Payel +10 more
Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in massive galaxies, have been reported recently in some dwarf galaxies. However, such studies have usually been on kiloparsec and larger sca…
The bright blue side of the night sky: Spectroscopic survey of bright and hot (pre-) white dwarfs
Kepler, S. O.; Uzundag, Murat; Pelisoli, Ingrid +10 more
We report on the spectroscopic confirmation of 68 new bright (G = 13.5-17.2 mag) and blue (pre-)white dwarfs (WDs). This finding has allowed us to almost double the number of the hottest (Teff ≥ 60 kK) known WDs brighter than G = 16 mag. We increased the number of known ultra-high excitation (UHE) WDs by 20%, found one unambiguous close…
Mapping the distribution of OB stars and associations in Auriga
Quintana, Alexis L.; Wright, Nicholas J.; Jeffries, Robin D.
OB associations are important probes of recent star formation and Galactic structure. In this study, we focus on the Auriga constellation, an important region of star formation due to its numerous young stars, star-forming regions, and open clusters. We show using Gaia data that its two previously documented OB associations, Aur OB1 and OB2, are t…
A DZ white dwarf with a 30 MG magnetic field
Hermes, J. J.; Hollands, M. A.; Stopkowicz, S. +3 more
Magnetic white dwarfs with field strengths below 10 MG are easy to recognize since the Zeeman splitting of spectral lines appears proportional to the magnetic field strength. For fields ≳100 MG, however, transition wavelengths become chaotic, requiring quantum-chemical predictions of wavelengths and oscillator strengths with a non-perturbative tre…
Carbon Dioxide Retrievals From NOMAD-SO on ESA's ExoMars Trace Gas Orbiter and Temperature Profiles Retrievals With the Hydrostatic Equilibrium Equation: 1. Description of the Method
Aoki, S.; Vandaele, A. C.; Daerden, F. +14 more
The Solar Occultation (SO) channel of the Nadir and Occultation for Mars Discovery (NOMAD) instrument has been scanning the Martian atmosphere for almost 2 Martian years. In this work, we present a subset of the NOMAD SO data measured at the mesosphere at the terminator. From the data set, we investigated 968 vertical profiles of carbon dioxide de…
Investigating the Magnetic Structure of Interplanetary Coronal Mass Ejections Using Simultaneous Multispacecraft In Situ Measurements
Farrugia, C. J.; Galvin, A. B.; Davies, E. E. +5 more
In situ measurements from spacecraft typically provide a time series at a single location through coronal mass ejections (CMEs), and they have been one of the main methods to investigate CMEs. The CME properties derived from these in situ measurements are affected by temporal changes that occur as the CME passes over the spacecraft, such as radial…
Charging of free-falling test masses in orbit due to cosmic rays: Results from LISA Pathfinder
Mendes, L.; Russano, G.; Nofrarias, M. +72 more
A comprehensive summary of the measurements made to characterize test-mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the grabbing and positioning mechanism show that the initial charge of the test masses was negative after all release…
Electron Heating Scales in Collisionless Shocks Measured by MMS
Johlander, Andreas; Khotyaintsev, Yuri V.; Dimmock, Andrew P. +2 more
Electron heating at collisionless shocks in space is a combination of adiabatic heating due to large-scale electric and magnetic fields and non-adiabatic scattering by high-frequency fluctuations. The scales at which heating happens hints to what physical processes are taking place. In this letter, we study electron heating scales with data from t…
Splitting the lentils: Clues to galaxy/black hole coevolution from the discovery of offset relations for non-dusty versus dusty (wet-merger-built) lenticular galaxies in the Mbh-M*,spheroid and Mbh-M*,galaxy diagrams
Graham, Alister W.
This work advances the (galaxy morphology)-dependent (black hole mass, Mbh)-(spheroid/galaxy stellar mass, M*) scaling relations by introducing 'dust bins' for lenticular (S0) galaxies. Doing so has led to the discovery of Mbh-M*,sph and Mbh-M*,gal relations for dusty S0 galaxies - …
The Magellanic Edges Survey - IV. Complex tidal debris in the SMC outskirts
Da Costa, G. S.; Koposov, S. E.; Mackey, A. D. +2 more
We use data from the Magellanic Edges Survey (MagES) in combination with Gaia EDR3 to study the extreme southern outskirts of the Small Magellanic Cloud (SMC), focussing on a field at the eastern end of a long arm-like structure which wraps around the southern periphery of the Large Magellanic Cloud (LMC). Unlike the remainder of this structure, w…