Search Publications
Missions
Journals
Publication Years
Extracting the Heliographic Coordinates of Coronal Rays Using Images from WISPR/Parker Solar Probe
Riley, P.; Qiu, J.; Stenborg, G. +5 more
The Wide-field Imager for Solar Probe (WISPR) onboard Parker Solar Probe (PSP), observing in white light, has a fixed angular field of view, extending from 13.5∘ to 108∘ from the Sun and approximately 50∘ in the transverse direction. In January 2021, on its seventh orbit, PSP crossed the heliospheric current sheet …
Polarization, polarizing efficiency, and grain alignment towards the direction of the cluster NGC 2345
Hoang, Thiem; Pandey, Jeewan C.; Singh, Sadhana
We have investigated the grain alignment and dust properties towards the direction of the cluster NGC 2345 using the multiband optical polarimetric observations. For the majority of the stars, the observed polarization is found to be due to the interstellar medium with average values of maximum polarization and wavelength corresponding to it as 1.…
Gamma-Ray Diagnostics of r-process Nucleosynthesis in the Remnants of Galactic Binary Neutron-star Mergers
Katsuda, Satoru; Terada, Yukikatsu; Bamba, Aya +4 more
We perform a full nuclear-network numerical calculation of the r-process nuclei in binary neutron-star mergers (NSMs), with the aim of estimating gamma-ray emissions from the remnants of Galactic NSMs up to 106 yr old. The nucleosynthesis calculation of 4070 nuclei is adopted to provide the elemental composition ratios of nuclei with an…
High-resolution near-infrared spectroscopy of globular cluster and field stars toward the Galactic bulge
Lee, Young-Wook; Koch-Hansen, Andreas J.; Hong, Seungsoo +2 more
Globular clusters (GCs) play an important role in the formation and evolution of the Milky Way. New candidates are continuously found, particularly in the high-extinction low-latitude regions of the bulge, although their existence and properties have yet to be verified. In order to investigate the new GC candidates, we performed high-resolution ne…
Importance of radiative pumping for the excitation of the H2O submillimeter lines in galaxies
González-Alfonso, Eduardo; Pereira-Santaella, Miguel; Yang, Chentao +3 more
H2O submillimeter emission is a powerful diagnostic of the molecular interstellar medium in a variety of sources, including low- and high-mass star-forming regions of the Milky Way, and from local to high-redshift galaxies. However, the excitation mechanism of these lines in galaxies has been debated, preventing a basic consensus on the…
Chromospheric emission from nanoflare heating in RADYN simulations
De Pontieu, B.; Rouppe van der Voort, L.; Carlsson, M. +4 more
Context. Heating signatures from small-scale magnetic reconnection events in the solar atmosphere have proven to be difficult to detect through observations. Numerical models that reproduce flaring conditions are essential in understanding how nanoflares may act as a heating mechanism of the corona.
Aims: We study the effects of non-thermal e…
Numerical and experimental evidence for a new interpretation of residence times in space
Heber, B.; Herbst, K.; Engelbrecht, N. Eugene +2 more
Aims: We investigate the energy dependence of Jovian electron residence times, which allows for a deeper understanding of adiabatic energy changes that occur during charged particle transport, as well as of their significance for simulation approaches. Thereby we seek to further validate an improved approach to estimate residence times numeri…
Aeolian disruption and reworking of TARs at the Zhurong rover field site, southern Utopia Planitia, Mars
Lu, Yu; Wu, Bo; Edgett, Kenneth S. +6 more
China's Zhurong rover explored four crescent-shaped TARs during the first 107 sols. The crust formed by accumulation and induration of aeolian dust makes TARs light-toned in orbiter images. Two TARs degraded into smaller megaripples due to a change of wind regime. TARs might share similar formation and evolution mechanisms with megaripples.
The transient ultraluminous X-ray source, ULX-4, in M51
Akyuz, A.; Aksaker, N.; Avdan, S. +6 more
We present the results of a temporal and spectral analysis of the transient source ULX-4 in the galaxy M51. The data used were drawn from Chandra, XMM-Newton, and Swift-XRT archives, spanning the years 2000-2019.. The X-ray flux of the source is seen to vary by two orders of magnitudes within a month but a short-term variability was not observed o…
Impacts of Heterogeneous Chemistry on Vertical Profiles of Martian Ozone
Vandaele, A. C.; Villanueva, G. L.; Liuzzi, G. +7 more
We show a positive vertical correlation between ozone and water ice using a vertical cross-correlation analysis with observations from the ExoMars Trace Gas Orbiter's Nadir and Occultation for Mars Discovery instrument. This is particularly apparent during LS = 0°-180°, Mars Year 35 at high southern latitudes, when the water vapor abund…