Search Publications
Obscured Star Formation in the Host Galaxies of Superluminous Supernovae
Morokuma, T.; Matsuda, Y.; Konishi, M. +7 more
We present the results of 3 GHz radio continuum observations of the eight host galaxies of superluminous supernovae (SLSNe) at 0.1 < z < 0.3 by using the Karl G. Jansky Very Large Array. Four host galaxies are detected significantly, and two of them are found to have high star formation rates (SFRs > 20 M ⊙ yr-1) der…
Betatron Cooling of Suprathermal Electrons in the Terrestrial Magnetotail
Xu, Y.; Liu, Y. Y.; Liu, C. M. +1 more
The cigar distribution of suprathermal electrons (40-200 keV), showing electron pitch angles primarily in the parallel and anti-parallel directions, has been frequently observed in the terrestrial magnetotail. The formation of such a distribution is typically attributed to Fermi acceleration, betatron cooling, or a combination of these. To date, F…
The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)
Stone, Jordan; Ertel, Steve; Spalding, Eckhart +8 more
Monitoring the long-term radial velocity (RV) and acceleration of nearby stars has been proven as an effective method for directly detecting binary and substellar companions. Some fraction of nearby RV trend systems are expected to be comprised of compact objects that likewise induce a systemic Doppler signal. In this paper, we report the discover…
Observational Evidence of Magnetic Reconnection Associated with Magnetic Flux Cancellation
Yang, Bo; Yang, Jiayan; Bi, Yi +4 more
Using high spatial and temporal data from the Solar Dynamics Observatory (SDO) and the Interface Region Imaging Spectrograph (IRIS), several observational signatures of magnetic reconnection in the course of magnetic flux cancellation are presented, including two loop-loop interaction processes, multiple plasma blob ejections, and a sheet-like str…
Chandrasekhar and Sub-Chandrasekhar Models for the X-Ray Emission of Type Ia Supernova Remnants. I. Bulk Properties
Yamaguchi, Hiroya; Auchettl, Katie; Badenes, Carles +9 more
Type Ia supernovae originate from the explosion of carbon-oxygen white dwarfs in binary systems, but the exact nature of their progenitors remains elusive. The bulk properties of Type Ia supernova remnants, such as the radius and the centroid energy of the Fe Kα blend in the X-ray spectrum, are determined by the properties of the supernova ejecta …
The 2016 Outburst of PSR J1119-6127: Cooling and a Spin-down-dominated Glitch
Scholz, P.; Kaspi, V. M.; Tendulkar, S. P. +1 more
We report on the aftermath of a magnetar outburst from the young, high magnetic field radio pulsar PSR J1119-6127 that occurred on 2016 July 27. We present the results of a monitoring campaign using the Neil Gehrels Swift X-ray Telescope, NuSTAR, and XMM-Newton. After reaching a peak absorbed 0.5-10 keV flux of {45}-7+5× {10}…
No Evidence of Chemical Abundance Variations in the Intermediate-age Cluster NGC 1783
de Grijs, Richard; Li, Chengyuan; Wu, Xiaohan +1 more
We have analyzed multi-passband photometric observations, obtained with the Hubble Space Telescope, of the massive (1.8 × 105 M ⊙), intermediate-age (1.8 Gyr-old) Large Magellanic Cloud star cluster NGC 1783. The morphology of the cluster’s red giant branch does not exhibit a clear broadening beyond its intrinsic width; the o…
The Variable Relativistic Outflow of IRAS 13224-3809
Chartas, George; Canas, Manuel H.
The discovery of an ultrafast outflow has been reported in the z = 0.0658 narrow-line Seyfert galaxy IRAS 13224-3809. The ultrafast outflow was first inferred through the detection of highly blueshifted absorption lines and then confirmed with a principal component analysis. Two of the reported properties of this outflow differed from those typica…
The Type IIn Supernova SN 2010bt: The Explosion of a Star in Outburst
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Smith, Nathan +12 more
It is well known that massive stars (M > 8 M ⊙) evolve up to the collapse of the stellar core, resulting in most cases in a supernova (SN) explosion. Their heterogeneity is related mainly to different configurations of the progenitor star at the moment of the explosion and to their immediate environments. We present photometry and sp…
Unraveling the Links among Sympathetic Eruptions
Wang, Yuming; Liu, Rui; Gou, Tingyu +4 more
Solar eruptions occurring at different places within a relatively short time interval are considered to be sympathetic. However, it is difficult to determine whether there exists a cause and effect between them. Here we study a failed and a successful filament eruption following an X1.8-class flare on 2014 December 20, in which slipping-like magne…