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A Large Double-ring Disk Around the Taurus M Dwarf J04124068+2438157
Herczeg, Gregory J.; Wilner, David J.; Ren, Bin B. +23 more
Planet formation imprints signatures on the physical structures of disks. In this paper, we present high-resolution (~50 mas, 8 au) Atacama Large Millimeter/submillimeter Array observations of 1.3 mm dust continuum and CO line emission toward the disk around the M3.5 star 2MASS J04124068+2438157. The dust disk consists of only two narrow rings at …
A Reemerging Bright Soft X-Ray State of the Changing-look Active Galactic Nucleus 1ES 1927+654: A Multiwavelength View
Cenko, S. Bradley; Meyer, Eileen; Lusso, Elisabeta +24 more
1ES1927+654 is a nearby active galactic nucleus (AGN) that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months to years. Here we report the unusual X-ray, UV, and radio variability of the source in its postflare state (2022 January-2023 May). First, we detect an increase…
Determination of dynamical ages of open clusters through the A+ parameter - II
Vaidya, Kaushar; Rao, Khushboo K.; Agarwal, Manan +2 more
Blue straggler stars (BSS), one of the most massive members of star clusters, have been used for over a decade to investigate mass segregation and estimate the dynamical ages of globular clusters (GCs) and open clusters (OCs). This work is an extension of our previous study, in which we investigated a correlation between theoretically estimated dy…
On the 3D Curvature and Dynamics of the Musca Filament
Coudé, Simon; Arzoumanian, Doris; Kaminsky, Aidan +1 more
Filaments are ubiquitous in the interstellar medium, yet their formation and evolution remain the topic of intense debate. In order to obtain a more comprehensive view of the 3D morphology and evolution of the Musca filament, we model the C18O(2-1) emission along the filament crest with several large-scale velocity field structures. Thi…
Observations of Magnetic Reconnection and Particle Acceleration Locations in Solar Coronal Jets
Panesar, Navdeep K.; Fleishman, Gregory D.; Musset, Sophie +2 more
We present a multiwavelength analysis of two flare-related jets on 2014 November 13, using data from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), the Reuven High Energy Solar Spectroscopic Imager (RHESSI), the Hinode/X-ray Telescope (XRT), and the Interface Region Imaging Spectrograph (IRIS). Unlike most coronal jets, whe…
Spatial Extent of Molecular Gas, Dust, and Stars in Massive Galaxies at z ∼ 2.2-2.5 Determined with ALMA and JWST
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +3 more
We present the results of 0.″6-resolution observations of CO J = 3 - 2 line emission in 10 massive star-forming galaxies at z ~ 2.2-2.5 with the Atacama Large Millimeter/submillimeter Array (ALMA). We compare the spatial extent of molecular gas with those of dust and stars, traced by the 870 and 4.4 µm continuum emissions, respectively. The …
Evaluating the performance of empirical models of total electron density and whistler-mode wave amplitude in the Earth's inner magnetosphere
Ma, Qianli; Shen, Xiao-Chen; Li, Wen +4 more
Empirical models have been previously developed using the large dataset of satellite observations to obtain the global distributions of total electron density and whistler-mode wave power, which are important in modeling radiation belt dynamics. In this paper, we apply the empirical models to construct the total electron density and the wave ampli…
A deep dive: Chandra observations of the NGC 4839 group falling into the Coma cluster
Walker, S. A.; Mirakhor, M. S.; Runge, J.
Cosmological simulations of structure formation predict that galaxy clusters continue to grow and evolve through ongoing mergers with group-scale systems. During these merging events, the ram pressure applied by the intracluster medium acts to strip the gas from the infalling groups, forming large tails of stripped gas, which eventually become par…
CHEX-MATE: Pressure profiles of six galaxy clusters as seen by SPT and Planck
Pointecouteau, E.; Pratt, G. W.; Rossetti, M. +11 more
Context. Pressure profiles are sensitive probes of the thermodynamic conditions and the internal structure of galaxy clusters. The intra-cluster gas resides in hydrostatic equilibrium within the dark-matter gravitational potential. However, this equilibrium may be perturbed; for example, as a consequence of thermal energy losses, feedback, and non…
Contemporaneous Observations of Hα Luminosities and Photometric Amplitudes for M Dwarfs
Kesseli, Aurora Y.; Douglas, Stephanie T.; Newton, Elisabeth R. +2 more
While many M dwarfs are known to have strong magnetic fields and high levels of magnetic activity, we are still unsure about the properties of their starspots and the origin of their magnetic dynamos. Both starspots and chromospheric heating are generated by the surface magnetic field; they produce photometric variability and Hα emission, respecti…