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Unveiling kinematic structure in the starburst heart of NGC 253
Turner, Jean L.; Consiglio, S. Michelle; Cohen, Daniel P.
We observed the Brackett α emission line (4.05 µm) within the nuclear starburst of NGC 253 to measure the kinematics of ionized gas, and distinguish motions driven by star formation feedback from gravitational motions induced by the central mass structure. Using NIRSPEC on Keck II, we obtained 30 spectra through a 0.5 arcsec slit stepped acr…
Chain of responses of geomagnetic and ionospheric storms to a bunch of central coronal hole and high speed stream of solar wind
Gulyaev, R. A.; Gulyaeva, T. L.
Results of analysis of the proxy of Coronal Hole (CH) Power index, Pch, combined with the high speed streams HSS of solar wind for a period from 2011 to 2019 are presented. It is found that the long-term variation of Pch index shows a trend of growing Pch towards the minimum of solar cycle while most of other identities of solar activity tend to d…
Anomalous Phyllosilicate-Bearing Outcrops South of Coprates Chasma: A Study of Possible Emplacement Mechanisms
Seelos, Frank P.; Murchie, Scott L.; Buczkowski, Debra L. +4 more
The formation of widespread phyllosilicate-bearing near-surface layers on Mars has often been attributed to pedogenesis, a process of weathering basaltic soils by continued exposure to meteoric water percolating down from the surface, which can result in layers of aluminum phyllosilicates forming over layers of iron-magnesium phyllosilicates. We p…
Statistical Signatures of Nanoflare Activity. II. A Nanoflare Explanation for Periodic Brightenings in Flare Stars Observed by NGTS
Mathioudakis, M.; Wheatley, P. J.; Goad, M. R. +9 more
Several studies have documented periodic and quasi-periodic signals from the time series of dMe flare stars and other stellar sources. Such periodic signals, observed within quiescent phases (i.e., devoid of larger-scale microflare or flare activity), range in a period from 1 to 1000 s and hence have been tentatively linked to ubiquitous p-mode os…
Local Starburst Conditions and Formation of GRB 980425/SN 1998bw within a Collisional Ring
Pian, E.; Bournaud, F.; Cormier, D. +9 more
We present the first spatially resolved study of molecular gas in the vicinity of a gamma-ray burst (GRB), using CO(2-1) emission-line observations with the Atacama Large Millimetre Array at ∼50 pc scales. The host galaxy of GRB 980425 contains a ring of high column density H I gas, which is likely to have formed due to a collision between the GRB…
Characterizing the Evolved Stellar Population in the Galactic Foreground. I. Bolometric Magnitudes, Spatial Distribution and Period-Luminosity Relations
Brown, Anthony G. A.; Rich, R. Michael; Stroh, Michael C. +6 more
Radio campaigns using maser stellar beacons have provided crucial information to characterize Galactic stellar populations. Currently, the Bulge Asymmetries and Dynamical Evolution (BAaDE) project is surveying infrared (IR) color-selected targets for SiO masers. This provides a sample of evolved stars that can be used to study the inner, optically…
K2-280 b - a low density warm sub-Saturn around a mildly evolved star
Cochran, William D.; Endl, Michael; Jordán, Andrés +57 more
We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = $0.35_{-0.04}^{+0.05}$ ) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has…
Rapid spectral transition of the black hole binary V404 Cygni
Motta, S. E.; Sánchez-Fernández, C.; Alfonso-Garzón, J. +2 more
During the June 2015 outburst of the black hole binary V404 Cyg, rapid changes in the X-ray brightness and spectra were common. The INTEGRAL monitoring campaign detected spectacular Eddington-limited X-ray flares, but also rapid variations at much lower flux levels. On 2015 June 21 at 20 h 50 min, the 3-10 keV JEM-X data as well as simultaneous op…
Observations of Outward-propagating and Mirroring of the Same Energetic Electrons by Wind
Zhao, L.; Li, G.; Yao, S. +1 more
We report an energetic electron event observed by the Wind spacecraft in which electrons were first detected to propagate away from the Sun, and subsequently detected to propagate back toward the Sun. Using the recently developed fractional velocity dispersion analysis (FVDA), the path lengths corresponding to these two sequential electron signals…
KMT-2016-BLG-1836Lb: A Super-Jovian Planet from a High-cadence Microlensing Field
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +24 more
We report the discovery of a super-Jovian planet in the microlensing event KMT-2016-BLG-1836, which was found by the Korea Microlensing Telescope Network (KMTNet) high-cadence observations ( ${\rm{\Gamma }}\sim 4\,{\mathrm{hr}}^{-1}$ ). The planet-host mass ratio q ∼ 0.004. A Bayesian analysis indicates that the planetary system is composed of a s…