Search Publications
Probing the Massive Star-forming Environment: A Multiwavelength Investigation of the Filamentary IRDC G333.73+0.37
Vig, S.; Mookerjea, B.; Ishwara-Chandra, C. H. +3 more
We present a multiwavelength study of the filamentary infrared dark cloud (IRDC) G333.73+0.37. The region contains two distinct mid-infrared sources S1 and S2 connected by dark lanes of gas and dust. Cold dust emission from the IRDC is detected at seven wavelength bands, and we have identified 10 high-density clumps in the region. The physical pro…
G7.7-3.7: A Young Supernova Remnant Probably Associated with the Guest Star in 386 CE (SN 386)
Vink, Jacco; Zhou, Ping; Li, Geng +1 more
Although the Galactic supernova rate is about two per century, only few supernova remnants (SNRs) are associated with historical records. There are a few ancient Chinese records of “guest stars” that are probably sightings of supernovae for which the associated SNRs are not established. Here we present an X-ray study of the SNR G7.7-3.7, as observ…
Diffuse X-Ray Emission from the Northern Arc of Loop I Observed with Suzaku
Nakashima, Shinya; Inoue, Yoshiyuki; Kataoka, Jun +4 more
After discovery of the Fermi bubbles, giant structures observed from radio to X-ray monitoring have been widely discussed as possible evidence of past activities in the Galactic center (GC). We report here on the analysis of all the Suzaku archival data pointing around the giant-scale Loop I arc. The diffuse X-ray emission from the northern Loop I…
SPIRITS 16tn in NGC 3556: A Heavily Obscured and Low-luminosity Supernova at 8.8 Mpc
Van Dyk, Schuyler D.; Smith, Nathan; Gehrz, Robert D. +17 more
We present the discovery by the SPitzer InfraRed Intensive Transients Survey (SPIRITS) of a likely supernova (SN) in NGC 3556 (M108) at only 8.8 Mpc that was not detected by optical searches. A luminous infrared (IR) transient at M [4.5] = -16.7 mag (Vega), SPIRITS 16tn is coincident with a dust lane in the inclined, star-forming disk o…
Evolution of Cometary Dust Particles to the Orbit of the Earth: Particle Size, Shape, and Mutual Collisions
Ishiguro, Masateru; Yang, Hongu
In this study, we numerically investigated the orbital evolution of cometary dust particles, with special consideration of the initial size-frequency distribution (SFD) and different evolutionary tracks according to the initial orbit and particle shape. We found that close encounters with planets (mostly Jupiter) are the dominating factor determin…
In Situ Generation of Transverse Magnetohydrodynamic Waves from Colliding Flows in the Solar Corona
Antolin, Patrick; Pagano, Paolo; Nakariakov, Valery M. +1 more
Transverse magnetohydrodynamic (MHD) waves permeate the solar atmosphere and are a candidate for coronal heating. However, the origin of these waves is still unclear. In this Letter, we analyze coordinated observations from Hinode/Solar Optical Telescope (SOT) and Interface Region Imaging Spectrograph ( IRIS) of a prominence/coronal rain loop-like…
Gaia-ESO Survey: INTRIGOSS—A New Library of High-resolution Synthetic Spectra
Jofré, Paula; Flaccomio, Ettore; Koposov, Sergey E. +19 more
We present a high-resolution synthetic spectral library, INTRIGOSS, designed for studying FGK stars. The library is based on atmosphere models computed with specified individual element abundances via ATLAS12 code. Normalized SPectra (NSPs) and surface Flux SPectra (FSP) in the wavelength range 4830-5400 Å were computed with the SPECTRUM code. INT…
Formation of the UV Spectrum of Molecular Hydrogen in the Sun
Judge, P. G.; Jaeggli, S. A.; Daw, A. N.
Ultraviolet (UV) lines of molecular hydrogen have been observed in solar spectra for almost four decades, but the behavior of the molecular spectrum and its implications for solar atmospheric structure are not fully understood. Data from the High-Resolution Telescope Spectrometer (HRTS) instrument revealed that H2 emission forms in part…
Observational Study of an Earth-affecting Problematic ICME from STEREO
Hess, Phillip; Wang, Yuming; Shen, Chenglong +4 more
We present a study of the origin of one interplanetary coronal mass ejection (ICME) that lacked an easily identifiable signature of an associated progenitor coronal mass ejection (CME) near the Sun in the observations of SOHO/LASCO at the L1 point. We consider these kinds of ICMEs as problematic, as they pose the difficulty of understanding the Su…
GD-1: The Relic of an Old Metal-poor Globular Cluster
Yanny, Brian; Wu, Yue; Li, Guang-Wei
Combining data from Gaia DR2, SDSS DR14, and LAMOST DR6, we update the fit to model of the properties of the stellar stream GD-1 and find that it has an age of ∼13 Gyr, [Fe/H] of -2.2 ± 0.12, and a distance from the Sun of ∼8 kpc. We tabulate six-dimensional (6D) phase-space fiducial points along the GD-1 stream orbit over a 90° arc. The fitted or…