Search Publications
Formation Imprints in the Kinematics of the Milky Way Globular Cluster System
Piatti, Andrés E.
We report results on the kinematics of Milky Way (MW) globular clusters (GCs) based on updated space velocities for nearly the entire GC population. We found that a 3D space with the semimajor axis, the eccentricity, and the inclination of the orbit with respect to the MW plane as its axes, is helpful in order to dig into the formation of the GC s…
The Galactic Disk Phase Spirals at Different Galactic Positions Revealed by Gaia and LAMOST Data
Wang, H. -F.; Huang, Y.; Chen, B. -Q. +9 more
We have investigated the distributions of stellar azimuthal and radial velocity components V Φ and V R in the vertical position-velocity plane Z-V Z across the Galactic disk of 6.34 ≲ R ≲ 12.34 kpc and | {{Φ }}| ≲ 7\buildrel{\circ}\over{.} 5 using a Gaia and Gaia-LAMOST sample of stars. As found in previous wor…
The First Metallicity Study of M83 Using the Integrated UV Light of Star Clusters
Skillman, Evan D.; Hernandez, Svea; Aloisi, Alessandra +8 more
Stellar populations are powerful tools for investigating the evolution of extragalactic environments. We present the first UV integrated-light spectroscopic observations for 15 young star clusters in the starburst M83 with a special focus on metallicity measurements. The data were obtained with the Cosmic Origins Spectrograph on board the Hubble S…
The SOFIA Massive (SOMA) Star Formation Survey. II. High Luminosity Protostars
Tanaka, Kei E. I.; Zhang, Yichen; Tan, Jonathan C. +6 more
We present multiwavelength images observed with SOFIA-FORCAST from ∼10 to 40 µm of seven high luminosity massive protostars, as part of the SOFIA Massive Star Formation Survey. Source morphologies at these wavelengths appear to be influenced by outflow cavities and extinction from dense gas surrounding the protostars. Using these images, we …
NuSTAR Measurement of Coronal Temperature in Two Luminous, High-redshift Quasars
Brandt, W. N.; Bianchi, S.; Cappi, M. +13 more
X-ray emission from the active galactic nucleus (AGN) is believed to be produced via Comptonization of optical/ultraviolet seed photons emitted by the accretion disk, upscattered by hot electrons in a corona surrounding the black hole. A critical compactness versus temperature threshold is predicted above which any increase in the source luminosit…
On the Nature of the Bright Core of Solar Coronal Mass Ejections
Chen, Y.; Song, H. Q.; Cheng, X. +5 more
Coronal mass ejections (CMEs) often exhibit the classic three-part structure in a coronagraph, i.e., the bright front, dark cavity, and bright core, which are traditionally considered as the manifestations of coronal plasma pileup, magnetic flux rope (MFR), and filament, respectively. However, a recent survey based on 42 CMEs all possessing the th…
Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo
Choi, Yumi; Boubert, Douglas; Nidever, David L. +7 more
We report spectroscopic measurements of stars in the recently discovered young stellar association Price-Whelan 1 (PW 1), which was found in the vicinity of the Leading Arm (LA) of the Magellanic Stream (MS). We obtained Magellan+MIKE high-resolution spectra of the 28 brightest stars in PW 1 and used The Cannon to determine their stellar parameter…
Diagnostics of the Prominence Plasma from Hα and Mg II Spectral Observations
Heinzel, Petr; Schmieder, Brigitte; Chen, Yao +5 more
The goal of this paper is to derive the physical conditions of the prominence observed on 2017 March 30. To do so, we use a unique set of data in Mg II lines obtained with the space-borne Interface Region Imaging Spectrograph (IRIS) and in Hα line with the ground-based Multi-Channel Subtractive Double Pass spectrograph operating at the Meudon sola…
High Forbidden-to-resonance Line Ratio of O VII Discovered from the Cygnus Loop
Tanaka, T.; Mori, K.; Gu, L. +5 more
Charge exchange (CX) is an important process in shock physics because it indicates an interaction between downstream ions and ambient neutral hydrogen, suggesting the presence of a collisionless shock. We present a high-resolution spectroscopy of an X-ray bright spot in a nearby supernova remnant (SNR), the Cygnus Loop, with the Reflection Grating…
Preflare Processes, Flux Rope Activation, Large-scale Eruption, and Associated X-class Flare from the Active Region NOAA 11875
Joshi, Bhuwan; Mitra, Prabir K.
We present a multiwavelength analysis of the eruption of a hot coronal channel associated with an X1.0 flare (SOL2013-10-28T02:03) from the active region NOAA 11875 by combining observations from Atmospheric Imaging Assembly/Solar Dynamics Observatory (SDO), Helioseismic and Magnetic Imager/SDO, Reuven Ramaty High Energy Solar Spectroscopic Imager…