Search Publications
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…
The Slowest Spinning X-Ray Pulsar in an Extragalactic Globular Cluster
Sartore, Nicola; Bachetti, Matteo; Webb, Natalie A. +2 more
Neutron stars are thought to be born rapidly rotating and then exhibit a phase of rotation-powered pulsations as they slow down to 1-10 s periods. The significant population of millisecond pulsars observed in our Galaxy is explained by the recycling concept: during an epoch of accretion from a donor star in a binary system, the neutron star is spu…
Probing the Hot X-Ray Gas in the Narrow-line Region of Mrk 3
Andrade-Santos, Felipe; Kraft, Ralph P.; Forman, William R. +2 more
We study the prototypical Seyfert 2 galaxy, Markarian 3, based on imaging and high-resolution spectroscopy observations taken by Chandra. We construct a deconvolved X-ray image, which reveals the S-shaped morphology of the hot gas in the narrow-line region (NLR). While this morphology is similar to the radio and [O III] emission, the distribution …
Direct Measurement of Anisotropic and Asymmetric Wave Vector Spectrum in Ion-scale Solar Wind Turbulence
Escoubet, C. P.; Narita, Y.; Roberts, O. W.
This analysis represents the first time that a simultaneous measurement of parallel and perpendicular spectral indices at both inertial and kinetic scales has been made directly in wave vector space, using a single interval of solar wind plasma. An interferometric wave vector analysis method is applied to four-point magnetometer data from the Clus…
Searching for Fossil Evidence of AGN Feedback in WISE-selected Stripe-82 Galaxies by Measuring the Thermal Sunyaev-Zel’dovich Effect with the Atacama Cosmology Telescope
Cohen, Seth; Joshi, Bhavin; Scannapieco, Evan +2 more
We directly measure the thermal energy of the gas surrounding galaxies through the thermal Sunyaev-Zel’dovich (tSZ) effect. We perform a stacking analysis of microwave background images from the Atacama Cosmology Telescope, around 1179 massive quiescent elliptical galaxies at 0.5 ≤ z ≤ 1.0 (“low-z”) and 3274 galaxies at 1.0 ≤ z ≤ 1.5 (“high-z”), s…