Search Publications
Intermediate-mass Elements in Young Supernova Remnants Reveal Neutron Star Kicks by Asymmetric Explosions
Katsuda, Satoru; Janka, Hans-Thomas; Tominaga, Nozomu +9 more
The birth properties of neutron stars (NSs) yield important information about the still-debated physical processes that trigger the explosion as well as on intrinsic neutron-star physics. These properties include the high space velocities of young neutron stars with average values of several 100 km s-1, with an underlying “kick” mechani…
Exploring the Effects of Disk Thickness on the Black Hole Reflection Spectrum
Reynolds, Christopher S.; Taylor, Corbin
The relativistically broadened reflection spectrum, observed in both AGN and X-ray binaries, has proven to be a powerful probe of the properties of black holes and the environments in which they reside. Emitted from the innermost regions of the accretion disk, this X-ray spectral component carries with it information not only about the plasma that…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XV. The Dynamical Clock: Reading Cluster Dynamical Evolution from the Segregation Level of Blue Straggler Stars
Dalessandro, E.; Salaris, M.; Anderson, J. +17 more
The parameter A +, defined as the area enclosed between the cumulative radial distribution of blue straggler stars (BSSs) and that of a reference population, is a powerful indicator of the level of BSS central segregation. As part of the Hubble Space Telescope UV Legacy Survey of Galactic globular clusters (GCs), here we present the BSS…
ALMA Detection of Extended [C II] Emission in Himiko at z = 6.6
Maiolino, R.; Amorín, R.; Smit, R. +1 more
Himiko is one of the most luminous Lyα emitters at z = 6.595. It has three star-forming clumps detected in the rest-frame UV, with a total SFR = 20 M ⊙ yr-1. We report the Atacama Large Millimeter/submillimeter Array (ALMA) detection of the [C II]158 µm line emission in this Galaxy with a significance of 8σ. The total […
A Comparison of the X-Ray Emission from Tidal Disruption Events with those of Active Galactic Nuclei
Ramirez-Ruiz, Enrico; Auchettl, Katie; Guillochon, James
One of the main challenges of current tidal disruption events (TDEs) studies is that emission arising from active galactic nucleus (AGN) activity may potentially mimic the expected X-ray emission of a TDE. Here we compare the X-ray properties of TDEs and AGNs to determine a set of characteristics that would allow us to discriminate between flares …
Spatial Distribution of the Milky Way Hot Gaseous Halo Constrained by Suzaku X-Ray Observations
Nakashima, Shinya; Inoue, Yoshiyuki; Kataoka, Jun +3 more
The formation mechanism of the hot gaseous halo associated with the Milky Way is still under debate. We report new observational constraints on the gaseous halo using 107 lines of sight of the Suzaku X-ray observations at 75° < l < 285° and | b| > 15^\circ with a total exposure of 6.4 Ms. The gaseous halo spectra are represented by a sing…
Discovery of Extended Main Sequence Turnoffs in Galactic Open Clusters
Di Criscienzo, M.; Balaguer-Núñez, L.; Milone, A. P. +5 more
The color-magnitude diagrams (CMDs) of Galactic open clusters are widely considered to be the prototypes of single stellar populations. By using photometry in ultraviolet and optical bands we discovered that the nearby young cluster NGC 6705 (M11) exhibits an extended main-sequence turnoff (eMSTO) and a broadened main sequence (MS). This is the fi…
Magnetic Flux Cancelation as the Trigger of Solar Coronal Jets in Coronal Holes
Panesar, Navdeep K.; Moore, Ronald L.; Sterling, Alphonse C.
We investigate in detail the magnetic cause of minifilament eruptions that drive coronal-hole jets. We study 13 random on-disk coronal-hole jet eruptions, using high-resolution X-ray images from the Hinode/X-ray telescope(XRT), EUV images from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and magnetograms from the SDO/He…
Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey
Benoit-Lévy, A.; Smith, M.; D'Andrea, C. B. +70 more
We present accretion disk size measurements for 15 luminous quasars at 0.7 ≤ z ≤ 1.9 derived from griz light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum e…
Solar Energetic Particle Events Observed by the PAMELA Mission
de Nolfo, G. A.; Christian, E. R.; Ryan, J. M. +55 more
Despite the significant progress achieved in recent years, the physical mechanisms underlying the origin of solar energetic particles (SEPs) are still a matter of debate. The complex nature of both particle acceleration and transport poses challenges to developing a universal picture of SEP events that encompasses both the low-energy (from tens of…