Search Publications
Derivation of the Magnetic Field in a Coronal Mass Ejection Core via Multi-frequency Radio Imaging
Vourlidas, A.; Tun, Samuel D.
The magnetic field within the core of a coronal mass ejection (CME) on 2010 August 14 is derived from analysis of multi-wavelength radio imaging data. This CME's core was found to be the source of a moving type IV radio burst, whose emission is here determined to arise from the gyrosynchrotron process. The CME core's true trajectory, electron dens…
The SEEDS Direct Imaging Survey for Planets and Scattered Dust Emission in Debris Disk Systems
Henning, Thomas; Terada, Hiroshi; Usuda, Tomonori +49 more
Debris disks around young main-sequence stars often have gaps and cavities which for a long time have been interpreted as possibly being caused by planets. In recent years, several giant planet discoveries have been made in systems hosting disks of precisely this nature, further implying that interactions with planets could be a common cause of su…
Massive Clumps in Local Galaxies: Comparisons with High-redshift Clumps
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Muñoz-Tuñón, C. +5 more
Local UV-bright galaxies in the Kiso survey include clumpy systems with kiloparsec-size star complexes that resemble clumpy young galaxies in surveys at high redshift. We compare clump masses and underlying disks in several dozen galaxies from each of these surveys to the star complexes and disks of normal spirals. Photometry and spectroscopy for …
Water Vapor in nearby Infrared Galaxies as Probed by Herschel
Omont, A.; Isaak, K. G.; Liu, Daizhong +5 more
We report the first systematic study of the submillimeter water vapor rotational emission lines in infrared (IR) galaxies based on the Fourier Transform Spectrometer (FTS) data of Herschel SPIRE. Among the 176 galaxies with publicly available FTS data, 45 have at least one H2O emission line detected. The H2O line luminosities…
A Soft X-Ray Reverberation Lag in the AGN ESO 113-G010
Fabian, A. C.; Uttley, P.; Cackett, E. M. +3 more
Reverberation lags have recently been discovered in a handful of nearby, variable active galactic nuclei (AGNs). Here, we analyze a ~100 ks archival XMM-Newton observation of the highly variable AGN, ESO 113-G010, in order to search for lags between hard, 1.5-4.5 keV, and soft, 0.3-0.9 keV, energy X-ray bands. At the lowest frequencies available i…
Is There a Metallicity Ceiling to Form Carbon Stars?—A Novel Technique Reveals a Scarcity of C stars in the Inner M31 Disk
Dalcanton, J. J.; Girardi, L.; Boyer, M. L. +10 more
We use medium-band near-infrared (NIR) Hubble Space Telescope WFC3 photometry with model NIR spectra of asymptotic giant branch (AGB) stars to develop a new tool for efficiently distinguishing carbon-rich (C-type) AGB stars from oxygen-rich (M-type) AGB stars in galaxies at the edge of and outside the Local Group. We present the results of a test …
Dynamical Modeling of Galaxy Mergers Using Identikit
Yun, M. S.; Armus, L.; Surace, J. +5 more
We present dynamical models of four interacting systems: NGC 5257/8, The Mice, the Antennae, and NGC 2623. The parameter space of the encounters are constrained using the Identikit model-matching and visualization tool. Identikit utilizes hybrid N-body and test particle simulations to enable rapid exploration of the parameter space of galaxy merge…
Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). III. Young Stellar Objects
van Loon, J. Th.; Indebetouw, R.; Hora, J. L. +15 more
The Spitzer Space Telescope Legacy Program SAGE-SMC allows global studies of resolved stellar populations in the SMC in a different environment than our Galaxy. Using the SAGE-SMC IRAC (3.6-8.0 µm) and MIPS (24 and 70 µm) catalogs and images combined with near-infrared (JHK s ) and optical (UBVI) data, we identified a popul…
High-resolution Spectroscopic Imaging of CO in a z = 4.05 Proto-cluster
Daddi, E.; Walter, F.; Riechers, D. +2 more
We present a study of the formation of clustered, massive galaxies at large look-back times via spectroscopic imaging of CO in the unique GN20 proto-cluster at z = 4.05. Existing observations show that this is a dense concentration of gas-rich, very active star forming galaxies, including multiple bright submillimeter galaxies (SMGs). Using deep, …
Propagating Waves Transverse to the Magnetic Field in a Solar Prominence
Schmieder, B.; Kucera, T. A.; Knizhnik, K. +3 more
We report an unusual set of observations of waves in a large prominence pillar that consist of pulses propagating perpendicular to the prominence magnetic field. We observe a huge quiescent prominence with the Solar Dynamics Observatory Atmospheric Imaging Assembly in EUV on 2012 October 10 and only a part of it, the pillar, which is a foot or bar…