Search Publications
Fan Loops Observed by IRIS, EIS, and AIA
Solanki, Sami K.; Polito, Vanessa; Gupta, G. R. +3 more
A comprehensive study of the physical parameters of active region fan loops is presented using the observations recorded with the Interface Region Imaging Spectrometer (IRIS), the EUV Imaging Spectrometer (EIS) on board Hinode, and the Atmospheric Imaging Assembly (AIA) and the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Obs…
OH Survey along Sightlines of Galactic Observations of Terahertz C+
Wang, Shen; Heiles, Carl; Li, Di +9 more
We have obtained OH spectra of four transitions in the {}2{{{\Pi }}}3/2 ground state, at 1612, 1665, 1667, and 1720 MHz, toward 51 sightlines that were observed in the Herschel project Galactic Observations of Terahertz C+. The observations cover the longitude range of (32°, 64°) and (189°, 207°) in the northern Galactic plan…
Explosive Chromospheric Evaporation and Warm Rain in a C3.1 Flare Observed by IRIS, Hinode/EIS, and RHESSI
Brosius, Jeffrey W.; Inglis, Andrew R.
IRIS and EIS observed a GOES C3.1 flare in stare mode on 2014 March 15. The GOES flare started at 00:21:35 and peaked at 00:26:30 UT. The IRIS slit pointed near the center of the flare, while the EIS slit pointed 35\prime\prime to its west. About 4 minutes before the GOES flare start, the IRIS C II and Si IV intensities became (and rema…
Carbon Abundances in Starburst Galaxies of the Local Universe
Leitherer, Claus; Wofford, Aida; Kewley, Lisa +2 more
The cosmological origin of carbon, the fourth most abundant element in the universe, is not well known and a matter of heavy debate. We investigate the behavior of C/O to O/H in order to constrain the production mechanism of carbon. We measured emission-line intensities in the spectral range from 1600 to 10000 Å on Space Telescope Imaging Spectrog…
VLBA Trigonometric Parallax Measurement of the Semi-regular Variable RT Vir
Menten, Karl M.; Honma, Mareki; Reid, Mark J. +4 more
We report a trigonometric parallax measurement of 22 GHz H2O masers toward the semi-regular variable RT Vir from multi-epoch Very Long Baseline Array observations. The parallax of 4.417 ± 0.134 mas, corresponding to a distance of 226 ± 7 pc, is significantly different from the Hipparcos parallax, but is consistent with a distance derive…
Discovery of an H I-rich Gas Reservoir in the Outskirts of SZ-effect-selected Clusters
Nagai, Daisuke; Schaye, Joop; Muzahid, Sowgat +2 more
We report on the detection of three strong H I absorbers originating in the outskirts (I.e., impact parameter, {ρ }{cl} ≈ (1.6-4.7)r 500) of three massive ({M}500∼ 3× {10}14 M ⊙) clusters of galaxies at redshift {z}{cl}≈ 0.46, in the Hubble Space Telescope Cosmic Origins Spectrograp…
Observations of Lyα and O VI: Signatures of Cooling and Star Formation in a Massive Central Cluster Galaxy
Donahue, Megan; Voit, G. Mark; Connor, Thomas +1 more
We report new Hubble Space Telescope COS and Space Telescope Imaging Spectrograph spectroscopy of a star-forming region (∼ 100 {M}⊙ yr-1) in the center of the X-ray cluster RX J1532.9+3021 (z = 0.362), to follow-up the CLASH team discovery of luminous UV filaments and knots in the central massive galaxy. We detect broad (∼50…
Interchange Reconnection Associated with a Confined Filament Eruption: Implications for the Source of Transient Cold-dense Plasma in Solar Winds
Li, Gang; Chen, Yao; Zheng, Ruisheng +2 more
The cold-dense plasma is occasionally detected in the solar wind with in situ data, but the source of the cold-dense plasma remains illusive. Interchange reconnections (IRs) between closed fields and nearby open fields are known to contribute to the formation of solar winds. We present a confined filament eruption associated with a puff-like coron…
ALMA Discovery of Solar Umbral Brightness Enhancement at λ = 3 mm
Solanki, Sami K.; Shimojo, Masumi; White, Stephen M. +2 more
We report the discovery of a brightness enhancement in the center of a large sunspot umbra at a wavelength of 3 mm using the Atacama Large Millimeter/sub-millimeter Array (ALMA). Sunspots are among the most prominent features on the solar surface, but many of their aspects are surprisingly poorly understood. We analyzed a λ = 3 mm (100 GHz) mosaic…
Expanding and Contracting Coronal Loops as Evidence of Vortex Flows Induced by Solar Eruptions
Aulanier, G.; Schmieder, B.; Démoulin, P. +2 more
Eruptive solar flares were predicted to generate large-scale vortex flows at both sides of the erupting magnetic flux rope. This process is analogous to a well-known hydrodynamic process creating vortex rings. The vortices lead to advection of closed coronal loops located at the peripheries of the flaring active region. Outward flows are expected …