Search Publications
Dense Molecular Clouds in the Crab Supernova Remnant
Bentley, Rory O.; Fabian, A. C.; Combes, F. +7 more
Molecular emission was imaged with ALMA from numerous components near and within bright H2-emitting knots and absorbing dust globules in the Crab Nebula. These observations provide a critical test of how energetic photons and particles produced in a young supernova remnant interact with gas, cleanly differentiating between competing mod…
The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA
Oliveira, Joana M.; Chen, C. -H. Rosie; van Loon, Jacco Th. +10 more
We report the first detection of deuterated water (HDO) toward an extragalactic hot core. The HDO 211-212 line has been detected toward hot cores N 105-2 A and 2 B in the N 105 star-forming region in the low-metallicity Large Magellanic Cloud (LMC) dwarf galaxy with the Atacama Large Millimeter/submillimeter Array (ALMA). We …
Detection of Extended Millimeter Emission in the Host Galaxy of 3C 273 and Its Implications for QSO Feedback via High Dynamic Range ALMA Imaging
Saito, Toshiki; Toba, Yoshiki; Matsuoka, Yoshiki +2 more
We estimate the amount of negative feedback energy injected into the interstellar medium (ISM) of the host galaxy of 3C 273, a prototypical radio-loud quasar. We obtained 93, 233, and 343 GHz continuum images with the Atacama Large Millimeter/submillimeter Array (ALMA). After self-calibration and point-source subtraction, we reach an image dynamic…
Hubble Space Telescope Imaging of Luminous Extragalactic Infrared Transients and Variables from the Spitzer Infrared Intensive Transients Survey
Gehrz, Robert D.; Bond, Howard E.; Bally, John +6 more
The SPitzer InfraRed Intensive Transients Survey (SPIRITS) searched for luminous infrared (IR) transients and variables in nearly 200 nearby galaxies from 2014 to 2019, using the warm Spitzer telescope at 3.6 and 4.5 µm. Among the SPIRITS variables are IR-bright objects that are undetected in ground-based optical surveys. We classify them as…
Multiepoch Optical Spectroscopy of the Post-AGB Star HD 161796
Puķītis, Kārlis; Začs, Laimons; Grankina, Aija
The evolutionary rate of the pulsating post-asymptotic giant branch (post-AGB) star HD 161796 was suspected to be high. Spectra of HD 161796 acquired during a time span of 18 yr are analyzed with the main goal of determining the evolutionary increase in temperature and comparing it with the latest post-AGB star evolutionary models. Inspection of t…
Star and Cluster Formation in the Sh2-112 Filamentary Cloud Complex
Chen, Wen Ping; Sun, Yan; Mondal, Soumen +1 more
We present the star formation activity around the emission nebula Sh2-112. At a distance of ~2.1 kpc, this H II complex, itself 3 pc in radius, is illuminated by the massive star (O8 V) BD+45 3216. The associated molecular cloud extends in angular scales of 2.°0 × 0.°83, corresponding to linear sizes of 73 pc by 30 pc, along the Galactic longitude…
S-type Stars Discovered in Medium-resolution Spectra of LAMOST DR9
Luo, A. -Li; Li, Yin-Bi; Wang, Rui +5 more
In this paper, we report on 606 S-type stars identified from Data Release 9 of the LAMOST medium-resolution spectroscopic (MRS) survey; 539 of them are reported for the first time. The discovery of these stars is a three-step process, i.e., selecting with ZrO-band indices greater than 0.25, excluding non-S-type stars with the iterative Support Vec…
Implicit Solar Coronal Magnetohydrodynamic (MHD) Modeling with a Low-dissipation Hybridized AUSM-HLL Riemann Solver
Shen, Fang; Xiang, Changqing; Wang, Haopeng +2 more
In this paper, we develop a 3D implicit single-fluid magnetohydrodynamic (MHD) model to simulate the steady-state solar corona with a wide range of Mach numbers and low plasma β. We employ a low-dissipation advection upstream splitting method (AUSM) to calculate the convective flux in the regions of low Mach numbers for a high resolution, and hybr…
NuSTAR Spectral Analysis beyond 79 keV with Stray Light
Tomsick, J. A.; Wilms, J.; Buisson, D. J. K. +10 more
Due to the structure of the NuSTAR telescope, photons at a large off axis (>1°) can reach the detectors directly (stray light), without passing through the instrument optics. At these off-axis angles NuSTAR essentially turns into a collimated instrument and the spectrum can extend to energies above the Pt K edge (79 keV) of the multilayers, whi…
Power Anisotropy, Dispersion Signature and Turbulence Diffusion Region in the 3D Wavenumber Domain of Space Plasma Turbulence
Verscharen, Daniel; He, Jiansen; Sahraoui, Fouad +4 more
We explore the multifaceted important features of turbulence (e.g., anisotropy, dispersion, and diffusion) in the three-dimensional (3D) wavenumber domain (k ∥, k ⊥,1, k ⊥,2), by employing the k-filtering technique to high-quality measurements of fields and particles from the Magnetospheric Multiscale Mission (MMS)…