Search Publications
The MAVERIC Survey: A Transitional Millisecond Pulsar Candidate in Terzan 5
Strader, Jay; Bahramian, Arash; Maccarone, Thomas J. +11 more
Transitional millisecond pulsars are accreting millisecond pulsars that switch between accreting X-ray binary and millisecond radio pulsar states. Only a handful of these objects have been identified so far. Terzan 5 CX1 is a variable hard-X-ray source in the globular cluster Terzan 5. In this paper, we identify a radio counterpart to CX1 in deep …
Evolution of CME Mass in the Corona
Vourlidas, Angelos; Howard, Russell A.
The idea that coronal mass ejections (CMEs) pile up mass in their transport through the corona and heliosphere is widely accepted. However, it has not been shown that this is the case. We perform an initial study of the volume electron density of the fronts of 13 three-part CMEs with well-defined frontal boundaries observed with the Solar and Heli…
Haze and cloud structure of Saturn's North Pole and Hexagon Wave from Cassini/ISS imaging
Sánchez-Lavega, A.; Antuñano, A.; Pérez-Hoyos, S. +2 more
In this paper we present a study of the vertical haze and cloud structure in the upper two bars of Saturn's Northern Polar atmosphere using the Imaging Science Subsystem (ISS) instrument onboard the Cassini spacecraft. We focus on the characterization of latitudes from 53° to 90° N. The observations were taken during June 2013 with five different …
Water production activity of nine long-period comets from SOHO/SWAN observations of hydrogen Lyman-alpha: 2013-2016
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +4 more
Nine recently discovered long-period comets were observed by the Solar Wind Anisotropies (SWAN) Lyman-alpha all-sky camera on board the Solar and Heliosphere Observatory (SOHO) satellite during the period of 2013 to 2016. These were C/2012 K1 (PanSTARRS), C/2013 US10 (Catalina), C/2013 V5 (Oukaimeden), C/2013 R1 (Lovejoy), C/2014 E2 (Jacques), C/2…
Planck's dusty GEMS. V. Molecular wind and clump stability in a strongly lensed star-forming galaxy at z = 2.2
Kneissl, R.; Le Floc'h, E.; Dole, H. +6 more
We report the discovery of a molecular wind signature from a massive intensely star-forming clump of a few 109 M⊙, in the strongly gravitationally lensed submillimeter galaxy "the Emerald" (PLCK_G165.7+49.0) at z = 2.236. The Emerald is amongst the brightest high-redshift galaxies on the submillimeter sky, and was initially d…
Violent Quenching: Molecular Gas Blown to 1000 km s-1 during a Major Merger
Moustakas, J.; Tremonti, C.; Yang, Yujin +7 more
We present Atacama Large Millimeter/submillimeter Array observations of a massive ({M}\star ≈ {10}11 {M}⊙ ) compact ({r}{{e},{UV}}≈ 100 pc) merger remnant at z = 0.66 that is driving a 1000 km s-1 outflow of cool gas, with no observational trace of an active galactic nucleus (AGN). We resolve …
Weakened Magnetization and Onset of Large-scale Turbulence in the Young Solar Wind—Comparisons of Remote Sensing Observations with Simulation
Parashar, Tulasi N.; Matthaeus, William H.; Goldstein, Melvyn L. +3 more
Recent analysis of Solar-Terrestrial Relations Observatory (STEREO) imaging observations have described the early stages of the development of turbulence in the young solar wind in solar minimum conditions. Here we extend this analysis to a global magnetohydrodynamic (MHD) simulation of the corona and solar wind based on inner boundary conditions,…
Identifying Observables That Can Differentiate Between Impulsive and Footpoint Heating: Time Lags and Intensity Ratios
Winebarger, Amy R.; Downs, Cooper; Mikić, Zoran +2 more
Observations of solar coronal loops have identified several common loop characteristics, including that loops appear to cool and have higher than expected densities. Two potential heating scenarios have been suggested to explain these observations. One scenario is that the loops are formed by many strands, each heated independently by a series of …
New Constraints on the Nature and Origin of the Leading Arm of the Magellanic Stream
Richter, Philipp; Lockman, Felix J.; Fox, Andrew J. +5 more
We present a new precision measurement of gas-phase abundances of S, O, N, Si, Fe, P, Al, Ca as well as molecular hydrogen (H2) in the Leading Arm (region II, LA II) of the Magellanic Stream (MS) toward the Seyfert galaxy NGC 3783. The results are based on high-quality archival ultraviolet/optical/radio data from various different instr…
Optical High-resolution Spectroscopy of 14 Young α-rich Stars
Ishigaki, Miho N.; Matsuno, Tadafumi; Yong, David +1 more
We report chemical abundances of 14 young α-rich stars including neutron-capture elements based on high-quality optical spectra from HIRES/Keck I and differential line-by-line analysis. From a comparison of the abundance patterns of young α-rich stars to those of nearby bright red giants with a similar metallicity range (-0.7 < [Fe/H] < -0.2…