Search Publications
Torus Constraints in ANEPD-CXO245: A Compton-thick AGN with Double-peaked Narrow Lines
Goto, Tomotsugu; Burgarella, Denis; Tanimoto, Atsushi +18 more
We report on the torus constraints of the Compton-thick active galactic nucleus (AGN) with double-peaked optical narrow-line region emission lines, ANEPD-CXO245, at z = 0.449 in the AKARI NEP Deep Field. The unique infrared data on this field, including those from the nine-band photometry over 2-24 µm with the AKARI Infrared Camera, and the …
Properties of the Diffuse Emission around Warm Loops in Solar Active Regions
Brooks, David H.
Coronal loops in active regions are the subjects of intensive investigation, but the important diffuse unresolved emission in which they are embedded has received relatively little attention. Here I measure the densities and emission measure (EM) distributions of a sample of background-foreground regions surrounding warm (2 MK) coronal loops, and …
The Eruption of Outer Spine-like Loops Leading to a Double-stage Circular-ribbon Flare
Liu, Chang; Wang, Haimin; Lee, Jeongwoo
Circular-ribbon flares occur in a confined magnetic structure, but can also be associated with coronal mass ejections (CMEs) when a filament embedded under the fan erupts. Here we study an M8.7 circular-ribbon flare (SOL2014-12-17T04:51), which is accompanied by a CME yet without a clear indication of filament eruption. Using a nonlinear force-fre…
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…