Search Publications
Formation and thermodynamic evolution of plasmoids in active region jets
Del Zanna, Giulio; Mulay, Sargam M.; Tripathi, Durgesh +2 more
We have carried out a comprehensive study of the temperature structure of plasmoids, which successively occurred in recurrent active region jets. The multithermal plasmoids were seen to be travelling along the multithreaded spire as well as at the footpoint region in the EUV/UV images recorded by the Atmospheric Imaging Assembly (AIA). The differe…
Boundary Delineator for Martian Crater Instances with Geographic Information and Deep Learning
Liu, Danyang; Cheng, Weiming; Qian, Zhen +3 more
Detecting impact craters on the Martian surface is a critical component of studying Martian geomorphology and planetary evolution. Accurately determining impact crater boundaries, which are distinguishable geomorphic units, is important work in geological and geomorphological mapping. The Martian topography is more complex than that of the Moon, m…
X-Ray Emission of Ultraviolet Variable Active Galactic Nucleus Candidates
Wasleske, Erik J.; Baldassare, Vivienne F.
We analyze the X-ray properties of a sample of 23 high-probability active galactic nucleus (AGN) candidates with ultraviolet variability identified in Wasleske et al. Using data from the Chandra X-ray Observatory and XMM-Newton Observatory, we that find 11/23 nuclei are X-ray detected. We use spectral energy distribution modeling to compute star f…
The Variability and Radial Velocity of Planetary Nebula Central Stars
Ali, A.; Mindil, A.
The extremely accurate estimates of stellar variability and radial velocity in the Gaia Data Release 3 (Gaia DR3) have enabled us to examine the close binarity and radial velocity (RV) of central stars (CSs) of planetary nebulae (PNe). This study is twofold: (1) searching for new close binary CS candidates to better understand how binarity affects…
Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210
Milone, Antonino P.; Wang, Long; Li, Chengyuan +6 more
Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters. Therefore, searching for helium variations in a star cluster is a straightforward method to understand…
Evidence for AGN-regulated Cooling in Clusters at z 1.4: A Multiwavelength View of SPT-CL J0607-4448
Bayliss, Matthew; Kim, Keunho J.; Khullar, Gourav +9 more
We present a multiwavelength analysis of the galaxy cluster SPT-CL J0607-4448 (SPT0607), which is one of the most distant clusters discovered by the South Pole Telescope at z = 1.4010 ± 0.0028. The high-redshift cluster shows clear signs of being relaxed with well-regulated feedback from the active galactic nucleus (AGN) in the brightest cluster g…
Constraints on Europa's Water Group Torus from HST/COS Observations
Tsuchiya, Fuminori; Saur, Joachim; Roth, Lorenz +8 more
In situ plasma measurements as well as remote mapping of energetic neutral atoms around Jupiter provide indirect evidence that an enhancement of neutral gas is present near the orbit of the moon Europa. Simulations suggest that such a neutral gas torus can be sustained by escape from Europa's atmosphere and consists primarily of molecular hydrogen…
Modelling the variable emission states of γ-ray-emitting narrow-line Seyfert 1 galaxies
Luashvili, Anna; Boisson, Catherine; Zech, Andreas +2 more
γ-ray-emitting narrow-line Seyfert 1 galaxies (γ-NLS1) constitute an intriguing small population of active galactic nuclei with γ-ray emission resembling low-power flat-spectrum radio quasars (FSRQ), but with differing physical properties. They are jetted, γ/radio-loud Seyfert galaxies, with relatively low black hole masses, accreting at exception…
Residual gas damping noise in constrained volume in space-borne gravitational wave detection
Luo, Jie; Tan, Yu-Jie; Shao, Cheng-Gang +4 more
The residual gas damping in the enclosure surrounding a free-fall test mass is an important limiting factor for the sensitivity of some space detection missions. We present a constrained volume damping model for space-borne gravitational wave detection, which depends on the escape time needed for a molecule to diffuse out of the gap between two ad…
Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752
Pilachowski, Catherine A.; Deliyannis, Constantine P.; Shetrone, Matthew D. +8 more
We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 days binary DS And and the 15.53 days BD +37 410. For DS And, we find M 1 = 1.692 ± 0.004 ± 0.010M ⊙, R 1 = 2.185 ± 0.004 ± 0.008R ⊙, M …