Search Publications
When Does the Onset of Multiple Stellar Populations in Star Clusters Occur. II. No Evidence of Multiple Stellar Populations in Lindsay 113
Milone, Antonino P.; Li, Chengyuan; Wang, Yue
The presence of multiple populations (MPs) in almost all globular clusters (GCs) older than ∼10 Gyr has drawn lots of attention. Recently, cumulative evidence has indicated that extragalactic GCs that are older than 2 Gyr seem to also harbor MPs; however, those that are younger than 2 Gyr do not. These observations seem to imply that age is a prim…
Imaging Observations of Chromospheric Evaporation in a Circular-ribbon Flare
Huang, Y.; Li, D.; Zhang, Q. M.
In this paper, we report our multiwavelength imaging observations of chromospheric evaporation in a C5.5 circular-ribbon flare (CRF) on 2014 August 24. The flare was observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, the X-ray Telescope (XRT) on board the Hinode spacecraft, and the ground-based Nobeyama Rad…
On Doppler Shift and Its Center-to-limb Variation in Active Regions in the Transition Region
Tripathi, Durgesh; Ghosh, Avyarthana; Klimchuk, James A.
A comprehensive understanding of the structure of Doppler motions in the transition region including the center-to-limb variation and its relationship with the magnetic field structure is vital for the understanding of mass and energy transfer in the solar atmosphere. In this paper, we have performed such a study in an active region using the Si I…
Finding the Critical Decay Index in Solar Prominence Eruptions
Ravindra, B.; Doddamani, V. H.; Vemareddy, P. +1 more
The background field is assumed to play a prime role in erupting structures like prominences. In the flux rope models, the critical decay index (n c ) is a measure of the rate at which background field intensity decreases with height over the flux rope or erupting structure. In the real observations, the critical height of the backgrou…
Evidence of Interacting Elongated Filaments in the Star-forming Site AFGL 5142
Dewangan, L. K.; Ojha, D. K.; Baug, T. +1 more
To probe the ongoing physical mechanism, we studied a wide-scale environment around AFGL 5142 (area ∼25 pc × 20 pc) using a multiwavelength approach. The Herschel column density (N(H2)) map reveals a massive inverted Y-like structure (mass ∼6280 M ⊙), which hosts a pair of elongated filaments (lengths >10 pc). The Herschel…
Nonthermal Motions in a Polar Coronal Hole Measured with Hinode/EIS during an on-Orbit Partial Solar Eclipse on 2017 August 21
Hara, Hirohisa
We have performed a spectroscopic observation over the south polar coronal hole (PCH) with the Hinode Extreme-ultraviolet (EUV) Imaging Spectrometer (EIS) during an on-orbit partial solar eclipse. In this partial eclipse, the Moon passed through the EIS observing area that was set in the south PCH at the height of 0.9-1.4 solar radii. Using the lu…
Gas Accretion within the Dust Cavity in AB Aur
Rivière-Marichalar, Pablo; Fuente, Asunción; Baruteau, Clément +5 more
AB Aur is a Herbig Ae star hosting a well-known transitional disk. Because of its proximity and low inclination angle, it is an excellent object to study planet formation. Our goal is to investigate the chemistry and dynamics of the molecular gas component in the AB Aur disk, and its relation with the prominent horseshoe shape observed in continuu…
Sub-Eddington Supermassive Black Hole Activity in Fornax Early-type Galaxies
Treu, Tommaso; Ferrarese, Laura; Gallo, Elena +6 more
We characterize the incidence and intensity of low-level supermassive black hole activity within the Fornax cluster, through X-ray observations of the nuclei of 29 quiescent early-type galaxies. Using the Chandra X-ray Telescope, we target 17 galaxies from the Hubble Space Telescope Fornax Cluster Survey, down to a uniform (3σ) limiting X-ray lumi…
NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs
Mori, Kaya; Hare, Jeremy; Stern, Daniel +3 more
The NuSTAR Legacy program titled Unidentified INTEGRAL Sources targeted faint hard X-ray sources revealed by INTEGRAL in the Galactic plane in order to provide conclusive identification of their nature and insights on the population of faint hard X-ray sources. The NuSTAR and Swift X-Ray Telescope observations obtained in 2015-2017 contributed to …
Implications of Philae Magnetometry Measurements at Comet 67P/Churyumov-Gerasimenko for the Nebular Field of the Outer Solar System
Auster, Hans-Ulrich; Heinisch, Philip; Glassmeier, Karl-Heinz +3 more
The remanent magnetization of solar system bodies reflects their accretion mechanism, the space environment in which they formed, and their subsequent geological evolution. In particular, it has been suggested that some primitive bodies may have formed large regions of coherent remanent magnetization as a consequence of their accretion in a backgr…