Search Publications
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…
Improved white dwarves constraints on inelastic dark matter and left-right symmetric models
Biswas, Anirban; Kar, Arpan; Kim, Hyomin +2 more
Weakly interacting massive particles (WIMPs) can be captured in compact stars such as white dwarves (WDs) if they are in a dark matter (DM)-rich environment, leading to an increase in the star luminosity through their annihilation process. N -body simulations suggest that the core of the Messier 4 globular cluster (where plenty of WDs are observed…
An XMM-Newton EPIC X-Ray View of the Symbiotic Star R Aquarii
Toalá, Jesús A.; Sabin, Laurence; Guerrero, Martín A. +2 more
We present the analysis of archival XMM-Newton European Photon Imaging Camera (EPIC) X-ray observations of the symbiotic star R Aquarii. We used the Extended Source Analysis Software package to disclose diffuse soft X-ray emission extending up to 2.'2 (≈0.27 pc) from this binary system. The depth of these XMM-Newton EPIC observations reveals in un…
Nonthermal Radio Continuum Emission from Young Nearby Stars
Reffert, Sabine; Forbrich, Jan; Loinard, Laurent +5 more
Young and magnetically active low-mass stars often exhibit nonthermal coronal radio emission owing to the gyration of electrons in their magnetized chromospheres. This emission is easily detectable at centimeter wavelengths with the current sensitivity of large radio interferometers like the Very Large Array (VLA). With the aim of identifying near…