Search Publications
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…
The XMM cluster survey: exploring scaling relations and completeness of the dark energy survey year 3 redMaPPer cluster catalogue
Bacon, D.; Smith, M.; Allam, S. +67 more
We cross-match and compare characteristics of galaxy clusters identified in observations from two sky surveys using two completely different techniques. One sample is optically selected from the analysis of 3 years of Dark Energy Survey observations using the redMaPPer cluster detection algorithm. The second is X-ray selected from XMM observations…
Non-field-aligned Proton Beams and Their Roles in the Growth of Fast Magnetosonic/Whistler Waves: Solar Orbiter Observations
Verscharen, Daniel; He, Jiansen; Fedorov, Andrey +5 more
The proton beam is an important population of the non-Maxwellian proton velocity distribution in the solar wind, but its role in wave activity remains unclear. In particular, the velocity vector of the proton beam and its influence on wave growth/damping have not been addressed before. Here we explore the origin and the associated particle dynamic…
Transition Probabilities of Near-infrared Ce III Lines from Stellar Spectra: Applications to Kilonovae
Lee, Ho-Gyu; Lee, Jae-Joon; Ishigaki, Miho N. +6 more
Kilonova spectra provide us with information of r-process nucleosynthesis in neutron star mergers. However, it is still challenging to identify individual elements in the spectra mainly due to the lack of experimentally accurate atomic data for heavy elements at near-infrared wavelengths. Recently, Domoto et al. proposed that the absorption featur…
Long-term 4.6 µm Variability in Brown Dwarfs and a New Technique for Identifying Brown Dwarf Binary Candidates
Meisner, Aaron M.; Kirkpatrick, J. Davy; Gelino, Christopher R. +9 more
Using a sample of 361 nearby brown dwarfs, we have searched for 4.6 µm variability, indicative of large-scale rotational modulations or large-scale, long-term changes on timescales of over 10 yr. Our findings show no statistically significant variability in Spitzer's Infrared Array Camera (IRAC) channel 2 (ch2) or Wide-field Infrared Survey …
Seimei/KOOLS-IFU mapping of the gas and dust distributions in Galactic PNe: Unveiling the origin and evolution of the Galactic halo PN H4-1
Ueta, Toshiya; Otsuka, Masaaki; Tajitsu, Akito
H4-1 is a planetary nebula (PN) located in the Galactic halo, and is notably carbon-rich and one of the most metal-deficient PNe in the Milky Way. To unveil its progenitor evolution through accurate measurement of the gas mass, we conducted a comprehensive investigation of H4-1, using the newly obtained Seimei/KOOLS-IFU spectra and multiwavelength…
Centimeter-sized Grains in the Compact Dust Ring around Very-low-mass Star CIDA 1
Dong, Ruobing; Liu, Hauyu Baobab; Hashimoto, Jun +3 more
We examined the grain size in the dust ring encircling the 0.19 M ☉ T Tauri star CIDA 1 using the Karl G. Jansky Very Large Array at multiple centimeter wavelengths, with a spatial resolution of 0.″2-0.″9. We detected distinct partial-ring structures at these wavelengths around CIDA 1. Based on spatial distributions and spectral indices…
A comparison of the Milky Way's recent star formation revealed by dust thermal emission and high-mass stars
Klessen, R. S.; Elia, D.; Schisano, E. +10 more
We present a comparison of the Milky Way's star formation rate (SFR) surface density (∑SFR) obtained with two independent state-of-the-art observational methods. The first method infers ΣSFR from observations of the dust thermal emission from interstellar dust grains in far-infrared wavelengths registered in the Herschel infr…