Search Publications
Solar wind entry into Mercury's magnetosphere: Simulation results for the second swingby of BepiColombo
Narita, Y.; Motschmann, U.; Exner, W. +7 more
Context. We use a global 3D hybrid plasma model to investigate the interaction between Mercury's magnetosphere and the solar wind for the second BepiColombo swingby, evaluate magnetospheric regions, and study the typical energy profile of protons.
Aims: The objective of this study is to gain a better understanding of solar wind entry and anal…
Return to the Forgotten Ultraluminous X-Ray Source: A Broadband NICER+NuSTAR Study of NGC 4190 ULX-1
Fürst, Felix; Walton, Dominic J.; Stern, Daniel +7 more
We observed the nearby and relatively understudied ultraluminous X-ray source (ULX) NGC 4190 ULX-1 jointly with Neutron Star Interior Composition Explorer (NICER) and NuSTAR to investigate its broadband spectrum, timing properties, and spectral variation over time. We found NGC 4190 ULX-1 to have a hard spectrum characterized by two thermal compon…
Sufficiency of near-surface water ice as a driver of dust activity on comets: Rethinking the old enigma
Küppers, M.; Thomas, N.; Hartogh, P. +6 more
Context. Nearly all contemporary theoretical research on cometary dust activity relies on models depicting heat transfer and sublimation products within the near-surface porous layer. Gas flow exerts a pressure drag to the crust agglomerates, counteracting weak gravity and the tensile strength of that layer. Our interpretation of data from the Ros…
Near-Earth Object Observations using Synthetic Tracking
Zhai, Chengxing; Shao, Michael; Choi, Philip +5 more
Synthetic tracking (ST) has emerged as a potent technique for observing fast-moving near-Earth objects (NEOs), offering enhanced detection sensitivity and astrometric accuracy by avoiding trailing loss. This approach also empowers small telescopes to use prolonged integration times to achieve high sensitivity for NEO surveys and follow-up observat…
Identifying Coronal Sources of L1 Solar Wind Disturbances Using the Fisk Heliospheric Magnetic Field and Potential Field Extrapolations during Three Solar Minima
Régnier, S.; Steyn, P. J.; Johnson, D. +1 more
The solar minima between solar cycles 22–23, 23–24, and 24–25 are the best observed minima on record. In situ solar wind and interplanetary magnetic field measurements by the Wind and ACE spacecraft at L1 with 1 hr cadence are explored using wavelet analyses for the most quiescent year during each minimum. Times of local peaks in periodicities are…
Time-dependent Hinode/EIS Atlas of a Coronal Mass Ejection Containing Cool Material
Landi, E.; Manchester, W. B.; Wraback, E. M.
We report the first time-dependent spectral atlas of a coronal mass ejection (CME) observed by the Hinode/Extreme Ultraviolet Imaging Spectrometer (EIS). EIS observed the Cartwheel CME on 2008 April 9 at 09:30–10:00 UT in its full wavelength range and captured the bright core containing prominence material as it passed across the slit field of vie…
Overview Results of JWST Observations of Star-forming Clusters in the Extreme Outer Galaxy
Kobayashi, Naoto; Koch, Patrick M.; Lau, Ryan M. +4 more
The extreme outer Galaxy (EOG), which we define as the region of the Milky Way with a galactocentric radius of more than 18 kpc, provides an excellent opportunity to study star formation in an environment significantly different from that in the solar neighborhood because of its lower metallicity and lower gas density. We carried out near- and mid…
The origin of large emission line widths in massive galaxies at redshifts z 3-4
Papovich, C.; Glazebrook, K.; Kacprzak, G. G. +5 more
We present a sample of 22 massive galaxies with stellar masses >1010 M⊙ at 3 < z < 4 with deep H and K-band high resolution spectra (R = 3500-3000) from Keck/MOSFIRE and VLT/KMOS near-infrared spectrographs. We find a large fraction have strong [O III] 5007 and Hβ emission lines with large line widths (σ 100-450 km s…
Absorption of Millimeter-band CO and CN in the Early Universe: Molecular Clouds in the Radio Galaxy B2 0902+34 at Redshift 3.4
Lehnert, Matthew D.; Morganti, Raffaella; Villar-Martín, Montserrat +9 more
Using the Karl G. Jansky Very Large Array, we have detected absorption lines due to carbon monoxide, CO(J = 0 → 1), and the cyano radical, CN(N = 0 → 1), associated with radio galaxy B2 0902+34 at redshift z = 3.4. The detection of millimeter-band absorption observed 1.5 Gyr after the Big Bang facilitates studying molecular clouds down to gas mass…
Detailed chemical abundances of the globular cluster Terzan 6 in the inner bulge
Dalessandro, E.; Massari, D.; Rich, R. M. +7 more
We used near-infrared spectroscopy at medium-high resolution (R = 8000 − 25 000) to perform the first comprehensive chemical study of the intermediate luminosity bulge globular cluster Terzan 6. We derived detailed abundances and abundance patterns of 27 giant stars, likely members of Terzan 6, based on their accurate Hubble Space Telescope proper…