Search Publications
The impact of bar origin and morphology on stellar migration
Kawata, Daisuke; Okamoto, Takashi; Pettitt, Alex R. +1 more
Different mechanisms driving bar structure formation indicate that bar origins should be distinguishable in the stellar populations of galaxies. To study how these origins affect different bar morphologies and impact stellar orbits and migration, we analyse three simulated discs which are representative of bar formation under isolated evolution mo…
A Multiwavelength Light-curve Model of the Classical Nova V339 Del: A Mechanism for the Coexistence of Dust Dip and Supersoft X-Rays
Kato, Mariko; Hachisu, Izumi; Matsumoto, Katsura
The classical nova V339 Del 2013 is characterized by a 1.5 mag dip of the V light curve owing to a dust shell formation, with which soft X-ray emissions coexist. We present a Strömgren y-band light curve, which represents continuum emission, not influenced by strong [O III] emission lines. The y light curve monotonically decreases in marked contra…
Discovering the Mass-Scaled Damping Timescale from Microquasars to Blazars
Zhang, Haoyang; Yang, Shenbang; Dai, Benzhong
Studying the variability of the accretion disks of black holes and jets is important to identify their internal physical processes. In this Letter, we obtain the characteristic damping timescale of 34 blazars and 7 microquasars from the Fermi-Large Area Telescope and the XMM-Newton X-ray telescope, respectively. We found that the mass-scaled chara…
Gamma rays from dark matter spikes in EAGLE simulations
Peletier, R. F.; Horns, D.; Moulin, E. +3 more
Intermediate Mass Black Holes (IMBHs) with a mass range between 100 M⊙ and 106 M⊙ are expected to be surrounded by high dark matter densities, so-called dark matter spikes. The high density of self-annihilating Weakly Interacting Massive Particles (WIMPs) in these spikes leads to copious gamma-ray production. Suffi…
Numerous bidirectionally propagating plasma blobs near the reconnection site of a solar eruption
Chen, Wei; Tian, Hui; Su, Yang +7 more
A current sheet is a common structure involved in solar eruptions. However, it is observed in a minority of the events, and the physical properties of its fine structures during a solar eruption are rarely investigated. Here, we report an on-disk observation that displays 108 compact, circular, or elliptic bright structures, presumably plasma blob…
Near-infrared spectroscopic characterisation of Gaia ultra-cool dwarf candidates. Spectral types and peculiarities
Sarro, L. M.; Reylé, C.; Cooper, W. J. +10 more
Context. The local census of very low-mass stars and brown dwarfs is crucial to improving our understanding of the stellar-substellar transition and their formation history. These objects, known as ultra-cool dwarfs (UCDs), are essential targets for searches of potentially habitable planets. However, their detection poses a challenge because of th…
PDRs4All. V. Modelling the dust evolution across the illuminated edge of the Orion Bar
Abergel, A.; Juvela, M.; Paladini, R. +31 more
Context. Interstellar dust particles, in particular carbonaceous nano-grains (like polycyclic aromatic hydrocarbons, fullerenes, and amorphous hydrogenated carbon), are critical players for the composition, energy budget, and dynamics of the interstellar medium (ISM). The dust properties, specifically the composition and size of dust grains are no…
Updated Proper Motion of the Neutron Star in the Supernova Remnant Cassiopeia A
Holland-Ashford, Tyler; Slane, Patrick; Long, Xi
In this paper, we present updated estimates of the velocity of the neutron star (NS) in the supernova remnant Cassiopeia A using over two decades of Chandra observations. We use two methods: (1) recording the NS positions from dozens of Chandra observations, including the astrometric uncertainty estimates on the data points, but not correcting the…
CEERS Key Paper. IX. Identifying Galaxy Mergers in CEERS NIRCam Images Using Random Forests and Convolutional Neural Networks
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +32 more
A crucial yet challenging task in galaxy evolution studies is the identification of distant merging galaxies, a task that suffers from a variety of issues ranging from telescope sensitivities and limitations to the inherently chaotic morphologies of young galaxies. In this paper, we use random forests and convolutional neural networks to identify …
Optical- and UV-continuum Morphologies of Compact Radio Source Hosts
Worrall, D. M.; Morganti, R.; O'Dea, C. P. +6 more
We present the first systematic search for UV signatures from radio source-driven active galactic nuclei (AGN) feedback in Compact Steep Spectrum (CSS) radio galaxies. Owing to their characteristic sub-galactic jets (1–20 kpc projected linear sizes), CSS hosts are excellent laboratories for probing galaxy scale feedback via jet-triggered star form…