Search Publications
Investigating the Wave Nature of the Outer Envelope of Halo Coronal Mass Ejections
Vourlidas, Angelos; Kwon, Ryun-Young
We investigate the nature of the outer envelope of halo coronal mass ejections (H-CMEs) using multi-viewpoint observations from the Solar Terrestrial Relations Observatory-A, -B, and SOlar and Heliospheric Observatory coronagraphs. The 3D structure and kinematics of the halo envelopes and the driving CMEs are derived separately using a forward mod…
Various Local Heating Events in the Earliest Phase of Flux Emergence
Toriumi, Shin; Cheung, Mark C. M.; Katsukawa, Yukio
Emerging flux regions (EFRs) are known to exhibit various sporadic local heating events in the lower atmosphere. To investigate the characteristics of these events, especially to link the photospheric magnetic fields and atmospheric dynamics, we analyze Hinode, Interface Region Imaging Spectrograph (IRIS), and Solar Dynamics Observatory data of a …
ALMA Observations of Circumnuclear Disks in Early-type Galaxies: 12CO(2-1) and Continuum Properties
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +4 more
We present results from an Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 program to map CO(2-1) emission in nearby early-type galaxies (ETGs) that host circumnuclear gas disks. We obtained ∼0.″3 resolution Band 6 observations of seven ETGs selected on the basis of dust disks in Hubble Space Telescope images. We detect CO emission in …
DUSTiNGS. III. Distribution of Intermediate-age and Old Stellar Populations in Disks and Outer Extremities of Dwarf Galaxies
McQuinn, Kristen B. W.; Skillman, Evan D.; Boyer, Martha L. +8 more
We have traced the spatial distributions of intermediate-age and old stars in nine dwarf galaxies in the distant parts of the Local Group, using multi-epoch 3.6 and 4.5 µm data from the DUST in Nearby Galaxies with Spitzer (DUSTiNGS) survey. Using complementary optical imaging from the Hubble Space Telescope, we identify the tip of the red g…
Radio Pulse Search and X-Ray Monitoring of SAX J1808.4-3658: What Causes Its Orbital Evolution?
Hessels, Jason W. T.; Wijnands, Rudy; van der Klis, Michiel +6 more
The accreting millisecond X-ray pulsar SAX J1808.4-3658 shows a peculiar orbital evolution that proceeds at a very fast pace. It is important to identify the underlying mechanism responsible for this behavior because it can help to understand how this system evolves and which physical processes (such as mass loss or spin-orbit coupling) are occurr…
Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS Observations
Feng, Li; Zhu, Xiaoshuai; Li, Hui +4 more
By using a new method of forced-field extrapolation, we study the emerging flux region AR11850 observed by the Interface Region Imaging Spectrograph and Solar Dynamical Observatory. Our results suggest that the bright points (BPs) in this emerging region exhibit responses in lines formed from the upper photosphere to the transition region, which h…
Imaging a Central Ionized Component, a Narrow Ring, and the CO Snowline in the Multigapped Disk of HD 169142
Carrasco-González, Carlos; Rodríguez, Luis F.; Macías, Enrique +5 more
We report Very Large Array observations at 7 mm, 9 mm, and 3 cm toward the pre-transitional disk of the Herbig Ae star HD 169142. These observations have allowed us to study the millimeter emission of this disk with the highest angular resolution so far (0.″12 × 0.″09, or 14 au × 11 au, at 7 mm). Our 7 and 9 mm images show a narrow ring of emissio…
The Interstellar Medium in High-redshift Submillimeter Galaxies as Probed by Infrared Spectroscopy*
Smith, Matthew W. L.; van der Werf, Paul; Valtchanov, Ivan +21 more
Submillimeter galaxies (SMGs) at z≳ 1 are luminous in the far-infrared, and have star formation rates, SFR, of hundreds to thousands of solar masses per year. However, it is unclear whether they are true analogs of local ULIRGs or whether the mode of their star formation is more similar to that in local disk galaxies. We target these questions by …
First Detection of Prominence Material Embedded within a 2 × 106 K CME Front Streaming away at 100-1500 km s-1 in the Solar Corona
Habbal, Shadia Rifai; Ding, Adalbert
Coronal mass ejections (CMEs) are the largest and most dynamic explosions detected in the million degree solar corona, with speeds reaching up to 3000 km s-1 at Earth’s orbit. Triggered by the eruption of prominences, in most cases, one of the outstanding questions pertaining to the dynamic CME-prominence system is the fate of the cool …
DHIGLS: DRAO H I Intermediate Galactic Latitude Survey
Martin, P. G.; Kothes, R.; Lockman, Felix J. +5 more
Observations of Galactic H I gas for seven targeted regions at intermediate Galactic latitude are presented at 1\prime angular resolution using data from the DRAO Synthesis Telescope (ST) and the Green Bank Telescope (GBT). The DHIGLS data are the most extensive arcminute-resolution measurements of the diffuse atomic interstellar medium…