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Relation between Black Hole Mass and Bulge Luminosity in Hard X-Ray Selected Type 1 AGNs
Ho, Luis C.; Barth, Aaron J.; Kim, Minjin +1 more
Using I-band images of 35 nearby (z < 0.1) type 1 active galactic nuclei (AGNs) obtained with Hubble Space Telescope, selected from the 70-month Swift-BAT X-ray source catalog, we investigate the photometric properties of the host galaxies. With a careful treatment of the point-spread function (PSF) model and imaging decomposition, we robustly …
Coronal and Chromospheric Emission in A-type Stars
Robrade, J.; Schneider, P. C.; Wolk, Scott J. +3 more
Cool stars on the main sequence generate X-rays from coronal activity, powered by a convective dynamo. With increasing temperature, the convective envelope becomes smaller and X-ray emission fainter. We present Chandra/HRC-I observations of four single stars with early A spectral types. Only the coolest star of this sample, τ 3 Eri (T <…
Spherical harmonic decomposition and interpretation of the shapes of the small Saturnian inner moons
Lainey, V.; Rambaux, N.; Cooper, N. +2 more
Context. The Cassini-Huygens space mission made a series of observations of Saturn's small satellites during its grand finale stage. These measurements were performed in order to study the shape, geology, and surface composition of the small satellites as well as to study the impact of the environment, in particular the rings, on these small bodie…
SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531
Wilms, Jörn; Doroshenko, Victor; Tsygankov, Sergey S. +6 more
The results of the broadband spectral and timing study of the recently discovered transient X-ray pulsar MAXI J0903-531 in a wide range of luminosities that differ by a factor of ~30 are reported. The observed X-ray spectrum in both states can be described as a classical pulsar-like spectrum consisting of a power law with a high-energy cutoff. We …
Tracking of magnetic helicity evolution in the inner heliosphere. A radial alignment study
Richter, I.; Narita, Y.; Hadid, L. Z. +5 more
Context. Magnetic helicity is one of the invariants in ideal magnetohydrodynamics, and its spectral evolution has a substantial amount of information to reveal the mechanism that are behind turbulence in space and astrophysical plasmas.
Aims: The goal of our study is to observationally characterize the magnetic helicity evolution in the inner…
New Short-Period δ Scuti Stars in OGLE-IV Fields toward the Galactic Bulge
Soszyński, I.; Udalski, A.; Szymański, M. K. +12 more
We report the classification of 24 puzzling short-period variable stars located in OGLE-IV Galactic bulge fields. The stars are low-amplitude (<0.05 mag) multi-periodic objects with dominant periods between 22 min and 54 min whose type could not have been unambiguously established based on photometry only. A low-resolution spectroscopic follow-…
Power Anisotropy, Dispersion Signature and Turbulence Diffusion Region in the 3D Wavenumber Domain of Space Plasma Turbulence
Verscharen, Daniel; He, Jiansen; Sahraoui, Fouad +4 more
We explore the multifaceted important features of turbulence (e.g., anisotropy, dispersion, and diffusion) in the three-dimensional (3D) wavenumber domain (k ∥, k ⊥,1, k ⊥,2), by employing the k-filtering technique to high-quality measurements of fields and particles from the Magnetospheric Multiscale Mission (MMS)…
Venus' Cloud-Tracked Winds Using Ground- and Space-Based Observations with TNG/NICS and VEx/VIRTIS
Machado, Pedro; Peralta, Javier; Silva, José E. +3 more
Characterizing the wind speeds of Venus and their variability at multiple vertical levels is essential for a better understanding of the atmospheric superrotation, constraining the role of large-scale planetary waves in the maintenance of this superrotation, and in studying how the wind field affects clouds' distribution. Here, we present cloud-tr…
WASP-35 and HAT-P-30/WASP-51: Reanalysis using TESS and Ground-based Transit Photometry
Wang, Xiaobin; Gu, Shenghong; Sun, Leilei +3 more
High-precision transit observations provide excellent opportunities for characterizing the physical properties of exoplanetary systems. These physical properties supply many pieces of information for unvealing the internal structure, external atmosphere, and dynamical history of the planets. We present revised properties of the transiting systems …
A Search for Analogs of KIC 8462852 (Boyajian's Star): A Second List of Candidates
Schmidt, Edward G.
In data from the Kepler mission, the normal F3V star KIC 8462852 (Boyajian's star) was observed to exhibit infrequent dips in brightness that have not been satisfactorily explained. A previous paper reported the first results of a search for other similar stars in a limited region of the sky around the Kepler field. This paper expands on that sear…