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Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph
Johnson, Christian I.; Mateo, Mario; Frank, Matthias J. +4 more
The globular cluster H4, located in the center of the Fornax dwarf spheroidal galaxy, is crucial for understanding the formation and chemical evolution of star clusters in low-mass galactic environments. H4 is peculiar because the cluster is significantly more metal-rich than the galaxy's other clusters, is located near the galaxy center, and may …
GeMS/GSAOI Photometric and Astrometric Performance in Dense Stellar Fields
Dalessandro, E.; Saracino, S.; Marchetti, E. +7 more
Ground-based imagers at 8 m class telescopes assisted by multi-conjugate adaptive optics are primary facilities with which to obtain accurate photometry and proper motions in dense stellar fields. We observed the central region of the globular clusters Liller 1 and NGC 6624 with the Gemini Multi-conjugate Adaptive Optics System (GeMS) feeding the …
Time-dependent tomographic reconstruction of the solar corona
Lamy, P.; Vibert, D.; Peillon, C. +2 more
Solar rotational tomography (SRT) applied to white-light coronal images observed at multiple aspect angles has been the preferred approach for determining the three-dimensional (3D) electron density structure of the solar corona. However, it is seriously hampered by the restrictive assumption that the corona is time-invariant which introduces sign…
Discovery of Ubiquitous Fast-Propagating Intensity Disturbances by the Chromospheric Lyman Alpha Spectropolarimeter (CLASP)
Auchère, F.; Giono, G.; Kubo, M. +25 more
High-cadence observations by the slit-jaw (SJ) optics system of the sounding rocket experiment known as the Chromospheric Lyman Alpha Spectropolarimeter (CLASP) reveal ubiquitous intensity disturbances that recurrently propagate in either the chromosphere or the transition region or both at a speed much higher than the speed of sound. The CLASP/SJ…
Ion nose spectral structures observed by the Van Allen Probes
Kistler, L. M.; Zhang, J. -C.; Spence, H. E. +5 more
We present a statistical study of nose-like structures observed in energetic hydrogen, helium, and oxygen ions near the inner edge of the plasma sheet. Nose structures are spectral features named after the characteristic shapes of energy bands or gaps in the energy-time spectrograms of in situ measured ion fluxes. Using 22 months of observations f…
Galactic survey of 44Ti sources with the IBIS telescope onboard INTEGRAL
Sunyaev, Rashid A.; Tsygankov, Sergey S.; Lutovinov, Alexander A. +4 more
We report the results of the deepest Galactic plane (|b| < 17.5°) survey in the 67.9 and 78.4 keV nuclear de-excitation lines of titanium-44 (44Ti) performed using the data acquired with the IBIS/ISGRI instrument onboard the INTEGRAL satellite during 12 yr of operation. The peak sensitivity of our survey reached an unprecedented leve…
An Investigation of the Sources of Earth-directed Solar Wind during Carrington Rotation 2053
van Driel-Gesztelyi, L.; Fazakerley, A. N.; Harra, L. K.
In this work we analyze multiple sources of solar wind through a full Carrington Rotation (CR 2053) by analyzing the solar data through spectroscopic observations of the plasma upflow regions and the in situ data of the wind itself. Following earlier authors, we link solar and in situ observations by a combination of ballistic backmapping and pote…
The Dimensionless Age of the Universe: A Riddle for Our Time
Kirshner, Robert P.; Avelino, Arturo
We present the interesting coincidence of cosmology and astrophysics that points toward a dimensionless age of the Universe H 0 t 0 that is close to one. Despite cosmic deceleration for 9 Gyr and acceleration since then, we find H 0 t 0 = 0.96 ± 0.01 for the ΛCDM model that fits SN Ia data from Pan-STARR…
Sodium Absorption Systems toward SN Ia 2014J Originate on Interstellar Scales
Foley, R. J.; Sato, B.; Tanaka, M. +21 more
Na I D absorbing systems toward Type Ia supernovae (SNe Ia) have been intensively studied over the last decade with the aim of finding circumstellar material (CSM), which is an indirect probe of the progenitor system. However, it is difficult to deconvolve CSM components from non-variable, and often dominant, components created by interstellar mat…
ROSETTA lander Philae - soil strength analysis
Arnold, Walter; Roll, Reinhard; Witte, Lars
The landing of Philae, the lander of ESA's ROSETTA-mission, on November 12th 2014 on Comet 67P/Churyumov-Gerasimenko, was planned as a descent with passive landing activating a damper system and anchoring by harpoons at touch-down. The lander was not fixed to the ground at touch-down due to failing harpoons. The lander damper, however, was actuate…