Search Publications
Simultaneous Observations of p-mode Light Walls and Magnetic Reconnection Ejections above Sunspot Light Bridges
Hou, Yijun; Li, Ting; Yang, Shuhong +2 more
Recent high-resolution observations from the Interface Region Imaging Spectrograph reveal bright wall-shaped structures in active regions (ARs), especially above sunspot light bridges. Their most prominent feature is the bright oscillating front in the 1400/1330 Å channel. These structures are named light walls and are often interpreted to be driv…
The Three-part Structure of a Filament-unrelated Solar Coronal Mass Ejection
Chen, Y.; Li, B.; Song, H. Q. +6 more
Coronal mass ejections (CMEs) often exhibit the typical three-part structure in the corona when observed with white-light coronagraphs, I.e., the bright leading front, dark cavity, and bright core, corresponding to a high-low-high density sequence. As CMEs result from eruptions of magnetic flux ropes (MFRs), which can possess either lower (e.g., c…
NGC 741—Mergers and AGN Feedback on a Galaxy-group Scale
Giacintucci, S.; O'Sullivan, E.; David, L. +5 more
Low-mass galaxy cluster systems and groups will play an essential role in upcoming cosmological studies, such as those to be carried out with eROSITA. Though the effects of active galactic nuclei (AGNs) and merging processes are of special importance to quantify biases like selection effects or deviations from hydrostatic equilibrium, they are poo…
A Nonthermal Radio Filament Connected to the Galactic Black Hole?
Morris, Mark R.; Goss, W. M.; Zhao, Jun-Hui
Using the Very Large Array, we have investigated a nonthermal radio filament (NTF) recently found very near the Galactic black hole and its radio counterpart, Sgr A*. While this NTF—the Sgr A West Filament (SgrAWF)—shares many characteristics with the population of NTFs occupying the central few hundred parsecs of the Galaxy, the SgrAWF has the di…
Reconnection-driven Magnetohydrodynamic Turbulence in a Simulated Coronal-hole Jet
DeVore, C. Richard; Karpen, Judith T.; Uritsky, Vadim M. +1 more
Extreme-ultraviolet and X-ray jets occur frequently in magnetically open coronal holes on the Sun, especially at high solar latitudes. Some of these jets are observed by white-light coronagraphs as they propagate through the outer corona toward the inner heliosphere, and it has been proposed that they give rise to microstreams and torsional Alfvén…
Height-dependent Velocity Structure of Photospheric Convection in Granules and Intergranular Lanes with Hinode/SOT
Shimizu, T.; Oba, T.; Iida, Y.
The solar photosphere is the visible surface of the Sun, where many bright granules, surrounded by narrow dark intergranular lanes, are observed everywhere. The granular pattern is a manifestation of convective motion at the photospheric level, but its velocity structure in the height direction is poorly understood observationally. Applying bisect…
Growth of Bulges in Disk Galaxies Since z ∼ 1
Sachdeva, Sonali; Saha, Kanak; Singh, Harinder P.
We investigate the growth of bulges in bright ({M}B< -20) disk galaxies since z∼ 1, in rest-frame B and I-band, using images from HST ACS and WFC3 in GOODS-South for high redshifts (0.4< z< 1.0) and SDSS for local (0.02< z< 0.05). The growth history has been traced by performing two-component bulge-disk decomposition and …
Molecular Outflows: Explosive versus Protostellar
Palau, Aina; Zapata, Luis A.; Rodríguez, Luis F. +2 more
With the recent recognition of a second, distinctive class of molecular outflows, namely the explosive ones not directly connected to the accretion-ejection process in star formation, a juxtaposition of the morphological and kinematic properties of both classes is warranted. By applying the same method used in Zapata et al., and using 12
The Proper Motion of Pyxis: The First Use of Adaptive Optics in Tandem with HST on a Faint Halo Object
Neichel, B.; Linden, S. T.; Davies, R. +13 more
We present a proper motion measurement for the halo globular cluster Pyxis, using Hubble Space Telescope/ACS data as the first epoch and GeMS/GSAOI Adaptive Optics data as the second, separated by a baseline of ∼5 years. This is both the first measurement of the proper motion of Pyxis and the first calibration and use of Multi-Conjugate Adaptive O…
Interaction of Two Filaments in a Long Filament Channel Associated with Twin Coronal Mass Ejections
Chen, Yao; Zheng, Ruisheng; Wang, Bing +4 more
Using the high-quality observations of the Solar Dynamics Observatory, we present the interaction of two filaments (F1 and F2) in a long filament channel associated with twin coronal mass ejections (CMEs) on 2016 January 26. Before the eruption, a sequence of rapid cancellation and emergence of the magnetic flux has been observed, which likely tri…