Search Publications
Emission Lines in the Near-infrared Spectra of the Infrared Quintuplet Stars in the Galactic Center
Najarro, F.; Geballe, T. R.; de la Fuente, D. +1 more
We report the detection of a number of emission lines in the 1.0-2.4 µm spectra of four of the five bright-infrared dust-embedded stars at the center of the Galactic center’s (GC) Quintuplet Cluster. Spectroscopy of the central stars of these objects is hampered not only by the large interstellar extinction that obscures all of the objects i…
Prominence Eruption Initiated by Helical Kink Instability of an Embedded Flux Rope
Gopalswamy, N.; Ravindra, B.; Vemareddy, P.
We study the triggering mechanism of a limb-prominence eruption and the associated coronal mass ejection (CME) near AR 12342 using Solar Dynamics Observatory and Large Angle and Spectrometric Coronagraph/Solar Heliospheric Observatory observations. The prominence is seen with an embedded flux thread (FT) at one end and bifurcates from the middle t…
A Face-on Accretion System in High-mass Star Formation: Possible Dusty Infall Streams within 100 AU
Hirota, Tomoya; Honma, Mareki; Sorai, Kazuo +7 more
We report on interferometric observations of a face-on accretion system around the high-mass young stellar object, G353.273+0.641. The innermost accretion system of 100 au radius was resolved in a 45 GHz continuum image taken with the Jansky-Very Large Array. Our spectral energy distribution analysis indicated that the continuum could be explained…
Discovery of a Lensed Ultrabright Submillimeter Galaxy at z = 2.0439
Rebolo, R.; Dannerbauer, H.; Díaz-Sánchez, A. +1 more
We report an ultrabright lensed submillimeter galaxy (SMG) at z = 2.0439, WISE J132934.18+224327.3, identified as a result of a full-sky cross-correlation of the AllWISE and Planck compact source catalogs aimed to search for bright analogs of the SMG SMM J2135, the Cosmic Eyelash. Inspection of archival SCUBA-2 observations of the candidates revea…
Crossing the Eddington Limit: Examining Disk Spectra at High Accretion Rates
Done, Chris; Soria, Roberto; Swartz, Douglas A. +3 more
The faintest ultraluminous X-ray sources (ULXs), those with 0.3-10 keV luminosities 1< {L}{{X}}/{10}39< 3 {erg} {{{s}}}-1, tend to have X-ray spectra that are disk-like but broader than expected for thin accretion disks. These “broadened disk (BD)” spectra are thought to indicate near- or mildly super-Eddingt…
Circumnuclear Structures in Megamaser Host Galaxies
Greene, Jenny E.; Seth, Anil C.; Henkel, Christian +4 more
Using the Hubble Space Telescope, we identify circumnuclear (100-500 pc scale) structures in nine new H2O megamaser host galaxies to understand the flow of matter from kpc-scale galactic structures down to the supermassive black holes (SMBHs) at galactic centers. We double the sample analyzed in a similar way by Greene et al. and consid…
A Large-scale Plume in an X-class Solar Flare
Fleishman, Gregory D.; Nita, Gelu M.; Gary, Dale E.
Ever-increasing multi-frequency imaging of solar observations suggests that solar flares often involve more than one magnetic fluxtube. Some of the fluxtubes are closed, while others can contain open fields. The relative proportion of nonthermal electrons among those distinct loops is highly important for understanding energy release, particle acc…
Effects of Solar Activity on the Local Interstellar Magnetic Field Observed by Voyager 1 and IBEX
McComas, D. J.; Schwadron, N. A.
Interstellar Boundary Explorer (IBEX) observations have shown enhanced energetic neutral atom emission from a narrow, circular ribbon likely centered on the direction of the magnetic field in the local interstellar medium (LISM). IBEX observations are compared to Voyager 1's direct observations of the magnetic field in the LISM, which reveals stru…
Imaging Observations of Magnetic Reconnection in a Solar Eruptive Flare
Sun, X.; Ding, M. D.; Li, Y. +2 more
Solar flares are among the most energetic events in the solar atmosphere. It is widely accepted that flares are powered by magnetic reconnection in the corona. An eruptive flare is usually accompanied by a coronal mass ejection, both of which are probably driven by the eruption of a magnetic flux rope (MFR). Here we report an eruptive flare on 201…
Coronal Jets Simulated with the Global Alfvén Wave Solar Model
Gombosi, T. I.; Toth, G.; Antiochos, S. K. +5 more
This paper describes a numerical modeling study of coronal jets to understand their effects on the global corona and their contribution to the solar wind. We implement jets into a well-established three-dimensional, two-temperature magnetohydrodynamic (MHD) solar corona model employing Alfvén-wave dissipation to produce a realistic solar-wind back…