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Dramatic Changes in the Observed Velocity of the Accretion Disk Wind in MCG-03-58-007 Are Revealed by XMM-Newton and NuSTAR
Ballo, L.; Reeves, J. N.; Braito, V. +6 more
Past X-ray observations of the nearby Seyfert 2 MCG-03-58-007 revealed the presence of a powerful and highly variable disk wind, where two possible phases outflowing with v out1/c ~ -0.07 and v out2/c ~ -0.2 were observed. Multi-epoch X-ray observations, covering the period from 2010 to 2018, showed that the lower-velocity co…
Kepler-93: A testbed for detailed seismic modelling and orbital evolution of super-Earths around solar-like stars
Bétrisey, J.; Buldgen, G.; Khan, S. +4 more
Context. The advent of space-based photometry missions such as CoRoT, Kepler and TESS has sparkled the rapid development of asteroseismology and its synergies with exoplanetology. In the near future, the advent of PLATO will further strengthen such multi-disciplinary studies. In that respect, testing asteroseismic modelling strategies and their im…
Dust Extinction Law in Nearby Star-resolved Galaxies. I. M31 Traced by Supergiants
Gao, Jian; Ren, Yi; Wang, Yuxi
The dust extinction laws and dust properties in M31 are explored with a sample of reddened O-type and B-type supergiants obtained from the Local Group Galaxies Survey (LGGS). The observed spectral energy distributions (SEDs) for each tracer are constructed with multiband photometry from the LGGS, PS1 Survey, UKIRT, PHAT Survey, Swift/UVOT, and XMM…
Revisiting BD-06 1339b: A Likely False Positive Caused by Stellar Activity
Kane, Stephen R.; Pepper, Joshua; Fetherolf, Tara +3 more
As long as astronomers have searched for exoplanets, the intrinsic variability of host stars has interfered with the ability to reliably detect and confirm exoplanets. One particular source of false positives is the presence of stellar magnetic or chromospheric activity that can mimic the radial velocity reflex motion of a planet. Here we present …
The interstellar medium of high-redshift galaxies: Gathering clues from C III] and [C II] lines
Maiolino, R.; Pentericci, L.; Ferrara, A. +5 more
Context. A tight relation between [C II] 158 µm line luminosity and the star formation rate (SFR) has been observed for local galaxies. At high redshift (z > 5), galaxies instead deviate downwards from the local Σ[C II] − ΣSFR relation. This deviation might be caused by different interstellar medium (ISM) properties …
Energetic proton back-precipitation onto the solar atmosphere in relation to long-duration gamma-ray flares
Laitinen, T.; Dalla, S.; de Nolfo, G. A. +4 more
Context. Gamma-ray emission during long-duration gamma-ray flare (LDGRF) events is thought to be caused mainly by > 300 MeV protons interacting with the ambient plasma at or near the photosphere. Prolonged periods of the gamma-ray emission have prompted the suggestion that the source of the energetic protons is acceleration at a coronal mass ej…
A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary
Kulkarni, S. R.; Riddle, Reed; Dhillon, V. S. +24 more
Of more than a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes1-9. One way to achieve these short periods requires the donor star to have undergone substantial nuclear evolution before interacting with the white dwarf10-14
Hubble Space Telescope Imaging of Isolated Local Volume Dwarfs GALFA Dw3 and Dw4
Crnojević, D.; Mutlu-Pakdil, B.; Sand, D. J. +16 more
We present observations of the dwarf galaxies GALFA Dw3 and GALFA Dw4 with the Advanced Camera for Surveys on the Hubble Space Telescope. These galaxies were initially discovered as optical counterparts to compact H I clouds in the GALFA survey. Both objects resolve into stellar populations which display old red giant branch (RGB), younger helium-…
A Census of 163 Large-scale (≥10 pc), Velocity-coherent Filaments in the Inner Galactic Plane: Physical Properties, Dense-gas Fraction, and Association with Spiral Arms
Wang, Ke; Ge, Yifei
The interstellar medium has a highly filamentary and hierarchical structure that may play a significant role in star formation. A systematical study of the large-scale filaments toward their physical parameters, distribution, structures, and kinematics will inform us about which types of filaments have the potential to form stars, how the material…
Sensitivity of future gamma-ray telescopes to primordial black holes
Linden, Tim; Hooper, Dan; Keith, Celeste +1 more
The strongest existing constraints on primordial black holes with masses in the range of mBH∼1015- 1017 g have been derived from measurements of the local cosmic-ray electron-positron flux by Voyager 1, and MeV-scale gamma-ray observations of the inner Galaxy by COMPTEL and INTEGRAL. In this paper, we evaluate the …