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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 …
Analysis of a Century’s Worth of AR Scorpii Photometry from DASCH and ASAS-SN
Garnavich, Peter; Littlefield, Colin; Peterson, Erik
AR Scorpii (AR Sco) is a binary star system containing the only known white dwarf (WD) pulsar. Previously reported photometric data sets only provide coverage back to 2005, but we extend the observational baseline for AR Sco back to the beginning of the 20th century by analyzing observations from the Digital Access to a Sky Century at Harvard proj…
Gas Accretion within the Dust Cavity in AB Aur
Rivière-Marichalar, Pablo; Fuente, Asunción; Baruteau, Clément +5 more
AB Aur is a Herbig Ae star hosting a well-known transitional disk. Because of its proximity and low inclination angle, it is an excellent object to study planet formation. Our goal is to investigate the chemistry and dynamics of the molecular gas component in the AB Aur disk, and its relation with the prominent horseshoe shape observed in continuu…
A deeper look at the dust attenuation law of star-forming galaxies at high redshift
Bressan, A.; Pérez-González, P. G.; Barro, G. +4 more
A diverse range of dust attenuation laws is found in star-forming galaxies. In particular, Tress et al. (2018) studied the SHARDS survey to constrain the NUV bump strength (B) and the total-to-selective ratio (RV) of 1753 star-forming galaxies in the GOODS-N field at 1.5 < z < 3. We revisit here this sample to assess the implicati…
Polarisation of a small-scale cometary plasma environment. Particle-in-cell modelling of comet 67P/Churyumov-Gerasimenko
Nilsson, Hans; Goetz, Charlotte; Gunell, Herbert +2 more
Context. The plasma near the nucleus of a comet is subjected to an electric field to which a few different sources contribute: the convective electric field of the solar wind, the ambipolar electric field due to higher electron than ion speeds, and a polarisation field arising from the vastly different ion and electron trajectories.
Aims: Our…
Properties of the transient X-ray pulsar Swift J1816.7-1613 and its optical companion
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +4 more
We present results of investigation of the poorly studied X-ray pulsar