Search Publications
New Insights into Interstellar Object 1I/2017 U1 (‘Oumuamua) from SOHO/STEREO Nondetections
Knight, Matthew M.; Hui, Man-To
Object 1I/2017 U1 (‘Oumuamua) is the first interstellar small body ever discovered in the solar system. By the time of discovery, it had already passed perihelion. To investigate the behavior of ‘Oumuamua around perihelion, we searched for it in Solar and Heliospheric Observatory (SOHO) and Solar TErrestrial RElations Observatory (STEREO) images f…
Updated orbital ephemeris of the ADC source X 1822-371: a stable orbital expansion over 40 years
Sanna, A.; Tailo, M.; Di Salvo, T. +6 more
Aims: Source
The 82nd Name-List of Variable Stars. Part I - RA 0hr to 18hr, Novae and Globular-cluster Variables
Pastukhova, E. N.; Khruslov, A. V.; Samus, N. N. +3 more
We present the first part of a new Name-List of variable stars containing information on 1291 variable stars recently designated in the system of the General Catalogue of Variable Stars. With the exception of Novae and other unusual variables named upon request from the IAU CBAT or by our initiative, these stars are in the range of J2000.0 right a…
The dynamic chromosphere: Pushing the boundaries of observations and models
Pereira, Tiago M. D.
The interface between the bright solar surface and the million-degree corona continues to hold the key to many unsolved problems in solar physics. Advances in instrumentation now allow us to observe the dynamic structures of the solar chromosphere down to less than 0.″1 with cadences of just a few seconds and in multiple pola…
Observations of X‑ray reverberation around black holes
Ponti, G.; De Marco, B.
The X‑ray emission from accreting black hole (BH) systems displays strong variability. Short reverberation lags are expected between the primary hard X‑ray continuum and the reprocessed disk emission. These lags depend on light‑travel distances, thus offering the opportunity to map the geometry of the innermost accretion flow. X‑ray reverberation …
Investigating the origin of the Fe emission lines of the Seyfert 1 galaxy Mrk 205
Guainazzi, Matteo; Laha, Sibasish; Tripathi, Shruti +1 more
We have investigated the nature and origin of the Fe K emission lines in Mrk 205 using observations with Suzaku and XMM-Newton, aiming to resolve the ambiguity between a broad emission line and multiple unresolved lines of higher ionization. We detect the presence of a narrow Fe K α emission line along with a broad-band Compton reflection hump at …
The imprint of the thick stellar disc in the mid-plane of three early-type edge-on galaxies in the Fornax cluster
Katkov, Ivan Yu; Kniazev, Alexei Yu; Kasparova, Anastasia V. +1 more
Galactic stellar discs, such as that of the Milky Way, have usually a complex structure consisting of a thin and a thick component. The study of galactic disc sub-structures and their differences can shed light on the galaxy assembling processes and their evolution. However, due to observational difficulties there is a lack of information about th…
Compact gaseous accretion disk in Keplerian rotation around MWC 147
Monnier, John D.; Kraus, Stefan; Weigelt, Gerd +10 more
Context. The disks around some Herbig Be stars have been observed to be more compact than the expected dust sublimation radius for such objects. Highly refractory dust grains and optically thick gas emission have been proposed as possible explanations for this phenomenon.
Aims: Previously, the "undersized" Herbig Be star MWC 147 was observed …
Nonthermal Motions in a Polar Coronal Hole Measured with Hinode/EIS during an on-Orbit Partial Solar Eclipse on 2017 August 21
Hara, Hirohisa
We have performed a spectroscopic observation over the south polar coronal hole (PCH) with the Hinode Extreme-ultraviolet (EUV) Imaging Spectrometer (EIS) during an on-orbit partial solar eclipse. In this partial eclipse, the Moon passed through the EIS observing area that was set in the south PCH at the height of 0.9-1.4 solar radii. Using the lu…
Modeling the Global Distribution of Solar Wind Parameters on the Source Surface Using Multiple Observations and the Artificial Neural Network Technique
Shen, Fang; Yang, Yi
The global distribution of magnetic field and other plasma parameters on the source surface, which we set at 2.5 solar radii, is important for coronal and heliospheric modeling. In this article, we introduce a new data-driven self-consistent method to obtain the global distribution of different parameters. The magnetic and polarized brightness (p …