Search Publications
Very Large Array Multiband Radio Imaging of the Triple AGN Candidate SDSS J0849+1114
Nyland, Kristina; Li, Zhiyuan; Hou, Meicun +3 more
Kiloparsec-scale triple active galactic nuclei (AGNs), potential precursors of gravitationally bound triple massive black holes (MBHs), are rarely seen objects and believed to play an important role in the evolution of MBHs and their host galaxies. In this work we present a multiband (3.0, 6.0, 10.0, and 15.0 GHz), high-resolution radio imaging of…
Mirror Mode Storms Observed by Solar Orbiter
Fedorov, A.; Karlsson, T.; Owen, C. J. +8 more
Mirror modes (MMs) are ubiquitous in space plasma and grow from pressure anisotropy. Together with other instabilities, they play a fundamental role in constraining the free energy contained in the plasma. This study focuses on MMs observed in the solar wind by Solar Orbiter (SolO) for heliocentric distances between 0.5 and 1 AU. Typically, MMs ha…
Noble gases in Dome C micrometeorites - An attempt to disentangle asteroidal and cometary sources
Trieloff, Mario; Engrand, Cécile; Duprat, Jean +2 more
We have performed a comprehensive noble gas study, including the isotopes of krypton and xenon, on a set of micrometeorites (MMs) collected from surface snow at Dome C (DC) on the Antarctic plateau. He and Ne are generally dominated by a solar component, with lower 4He concentrations and 4He/20Ne ratios in crystall…
Search for carbon-bearing compounds on low-albedo asteroids
Barucci, M. A.; Fornasier, S.; Matsuoka, M. +5 more
In this work, we aim to investigate the presence of absorption bands around 3.4 µm in the infrared spectra of primitive asteroids. We collected the published reflectance spectra of low-albedo asteroids from the literature and analysed the 2.4-3.8 µm region using the same techniques. From the initial data set of 92 asteroids, we restric…
On the lithium abundance of the visual binary components ξ Boo A ( G8V ) and ξ Boo B ( K5V )
Strassmeier, Klaus G.; Steffen, Matthias
A spectroscopic investigation of the lithium resonance doublet in ξ Boo A and ξ Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R = 130,000 spectra with a signal‑to‑noise ratio (S/N) per pixel of up to 3200 using the 11.8 m LBT and PEPSI. From fits with synthetic line profiles based on 1D‑LTE MARCS model atmospher…
An Analysis of the Eclipsing Binaries HD 71636, V1022 Cassiopeiae, and OT Andromedae
Henry, Gregory W.; Fekel, Francis C.; Sowell, James R. +3 more
We have obtained high-dispersion spectroscopy and BV photometry of two F-type eclipsing binaries, HD 71636 and V1022 Cas, plus the A-type system OT And. Transiting Exoplanet Survey Satellite measurements for each system have also been incorporated. The photometry of HD 71636 enables a more consistent picture of this 5.01331 days, circular-orbit sy…
SOFIA/FORCAST Monitoring of the Dust Emission from R Aqr: Start of the Eclipse
Gorti, Uma; Whitelock, Patricia A.; Wagner, R. Mark +3 more
We present mid-infrared (mid-IR) spectra from our continued monitoring of R Aquarii, the nearest symbiotic Mira, using the Stratospheric Observatory for Infrared Astronomy (SOFIA). New photometric and spectroscipic data were obtained with the Faint Object infraRed CAmera for the SOFIA Telescope in 2018 and 2019 after the system had started its "ec…
On the stability of tangential discontinuity in the interaction of solar wind and cometary atmospheres
Baranov, V. B.; Alexashov, D. B.; Ruderman, M. S.
In 2004, European Space Agency launched the spacecraft Rosetta. After almost 10-yr flight it arrived at the Churyumova-Gerasimenko comet. Rosetta was orbiting about the comet for some time observing its environment. One of the most interesting observations obtained during this mission was multiple disappearance of magnetic field. It was suggested …
Hubble Space Telescope Observations of Tadpole Galaxies Kiso3867, SBS0, SBS1, and UM461
Kotulla, Ralf; Rafelski, Marc; Elmegreen, Bruce G. +8 more
Tadpole galaxies are metal-poor dwarfs with typically one dominant star-forming region, giving them a head-tail structure when inclined. A metallicity drop in the head suggests that gas accretion with even lower metallicity stimulated the star formation. Here we present multiband Hubble Space Telescope WFC3 and Advanced Camera for Surveys images o…
Discovery of a Radio-loud Narrow-line Seyfert 1 Galaxy at z = 0.9 Reddened with a Strong 2175 Å Bump
Jin, Chichuan; Hao, Lei; Ji, Tuo +12 more
We present a broadband spectrophotometric analysis of an unusual quasar, SDSS J160558.86+474300.1, at z = 0.9, found in a systematic search for reddened radio-loud narrow-line Seyfert 1 galaxies (NLS1s). J1605+4743 qualifies for the conventional definition of an NLS1 in its permitted emission line widths and Hβ/[O III] flux ratio. It also shows st…