Search Publications
An Unbiased CO Survey toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. I. Overview: CO Cloud Distributions
Tokuda, Kazuki; Tachihara, Kengo; Kawamura, Akiko +15 more
We have analyzed the data from a large-scale CO survey toward the northern region of the Small Magellanic Cloud (SMC) obtained with the Atacama Compact Array (ACA) stand-alone mode of ALMA. The primary aim of this study is to comprehensively understand the behavior of CO as an H2 tracer in a low-metallicity environment (Z ~ 0.2 Z ⊙…
On the Occurrence of Type IV Solar Radio Bursts in Solar Cycle 24 and Their Association with Coronal Mass Ejections
Kilpua, E. K. J.; Kumari, Anshu; Morosan, D. E.
Solar activities, in particular coronal mass ejections (CMEs), are often accompanied by bursts of radiation at meter wavelengths. Some of these bursts have a long duration and extend over a wide frequency band, namely, type IV radio bursts. However, the association of type IV bursts with CMEs is still not well understood. In this article, we perfo…
Mid-infrared Period-Luminosity Relations for Miras in the Large Magellanic Cloud
Soszyński, Igor; Kozłowski, Szymon; Iwanek, Patryk
We present the mid-infrared (mid-IR) period-luminosity relations (PLRs) using over 1000 Mira variables in the Large Magellanic Cloud, for the four Wide-field Infrared Survey Explorer and the four Spitzer bands. These PLRs cover a mid-IR wavelength range from 3.4-22 µm and are presented separately for the oxygen-rich (O-rich) and carbon-rich …
Observational Signatures of Cosmic-Ray Interactions in Molecular Clouds
Wu, Kinwah; Lai, Shih-Ping; On, Alvina Y. L. +1 more
We investigate ionization and heating of gas in the dense, shielded clumps/cores of molecular clouds bathed by an influx of energetic, charged cosmic rays (CRs). These molecular clouds have complex structures, with substantial variation in their physical properties over a wide range of length scales. The propagation and distribution of CRs is thus…
Recurrent Activity from Active Asteroid (248370) 2005 QN173: A Main-belt Comet
Chandler, Colin Orion; Trujillo, Chadwick A.; Hsieh, Henry H.
We present archival observations of main-belt asteroid (248370) 2005 QN173 (also designated 433P) that demonstrate this recently discovered active asteroid (a body with a dynamically asteroidal orbit displaying a tail or coma) has had at least one additional apparition of activity near perihelion during a prior orbit. We discovered evid…
Revisiting Attenuation Curves: The Case of NGC 3351
Grebel, Eva K.; Östlin, Göran; Smith, Linda J. +14 more
Multiwavelength images from the far-UV (∼0.15 µm) to the submillimeter of the central region of the galaxy NGC 3351 are analyzed to constrain its stellar populations and dust attenuation. Despite hosting a ∼1 kpc circumnuclear starburst ring, NGC 3351 deviates from the IRX-β relation, the relation between the infrared-to-UV luminosity ratio …
An Observational Study of a "Rosetta Stone" Solar Eruption
Mason, E. I.; Antiochos, Spiro K.; Vourlidas, Angelos
This Letter reports observations of an event that connects all major classes of solar eruptions: those that erupt fully into the heliosphere versus those that fail and are confined to the Sun, and those that eject new flux into the heliosphere, in the form of a flux rope, versus those that eject only new plasma in the form of a jet. The event orig…
Masses of White Dwarf Binary Companions to Type Ia Supernovae Measured from Runaway Velocities
Hermes, J. J.; Shen, Ken J.; Chandra, Vedant +1 more
The recently proposed "dynamically driven double-degenerate double-detonation" (D6) scenario posits that Type Ia supernovae (SNe) may occur during dynamically unstable mass transfer between two white dwarfs (WDs) in a binary. This scenario predicts that the donor WD may then survive the explosion and be released as a hypervelocity runaw…
A Homogeneous Comparison between the Chemical Composition of the Large Magellanic Cloud and the Sagittarius Dwarf Galaxy
Bellazzini, M.; Mucciarelli, A.; Origlia, L. +3 more
Similarities in the chemical composition of two of the closest Milky Way satellites, namely, the Large Magellanic Cloud (LMC) and the Sagittarius (Sgr) dwarf galaxy, have been proposed in the literature, suggesting similar chemical enrichment histories between the two galaxies. This proposition, however, rests on different abundance analyses, whic…
Observations of the Quiet Sun during the Deepest Solar Minimum of the Past Century with Chandrayaan-2 XSM: Sub-A-class Microflares outside Active Regions
Joshi, Bhuwan; Janardhan, P.; Bhardwaj, Anil +12 more
Solar flares, with energies ranging over several orders of magnitude, result from impulsive release of energy due to magnetic reconnection in the corona. Barring a handful, almost all microflares observed in X-rays are associated with the solar active regions. Here we present, for the first time, a comprehensive analysis of a large sample of quiet…