Search Publications
Solar Energetic Particle Event Onsets: Far Backside Solar Sources and the East-West Hemispheric Asymmetry
Kahler, S. W.
Prompt onsets and short rise times to peak intensities Ip have been noted in a few solar energetic (E > 10 MeV) particle (SEP) events from far behind (≥25°) the west limb. We discuss 15 archival and recent examples of these prompt events, giving their source longitudes, onset and rise times, and associated coronal mass ejection (CME) speeds. Th…
Multi-wavelength Lens Reconstruction of a Planck and Herschel-detected Star-bursting Galaxy
Baes, Maarten; Fu, Hai; Clements, David L. +21 more
We present a source-plane reconstruction of a Herschel and Planck-detected gravitationally lensed dusty star-forming galaxy (DSFG) at z = 1.68 using Hubble, Submillimeter Array (SMA), and Keck observations. The background submillimeter galaxy (SMG) is strongly lensed by a foreground galaxy cluster at z = 0.997 and appears as an arc with a length o…
SEEDS Direct Imaging of the RV-detected Companion to V450 Andromedae, and Characterization of the System
Kuzuhara, M.; Tamura, M.; Ishii, M. +49 more
We report the direct imaging detection of a low-mass companion to a young, moderately active star V450 And, that was previously identified with the radial velocity (RV) method. The companion was found in high-contrast images obtained with the Subaru Telescope equipped with the HiCIAO camera and AO188 adaptive optics system. From the public ELODIE …
Chandra View of Magnetically Confined Wind in HD191612: Theory Versus Observations
Zhekov, Svetozar A.; Nazé, Yaël; ud-Doula, Asif
High-resolution spectra of the magnetic star HD 191612 were acquired using the Chandra X-ray Observatory at both maximum and minimum emission phases. We confirm the flux and hardness variations previously reported with XMM-Newton, demonstrating the high repeatability of the behavior of HD 191612 over a decade. The line profiles appear typical for …
The ACS Fornax Cluster Survey. XII. Diffuse Star Clusters in Early-type Galaxies
Jordán, Andrés; Côté, Patrick; Peng, Eric W. +5 more
Diffuse star clusters (DSCs) are old and dynamically hot stellar systems that have lower surface brightness and more extended morphology than globular clusters (GCs). Using the images from Hubble Space Telescope (HST)/ACS Fornax Cluster Survey, we find that 12 out of 43 early-type galaxies (ETGs) in the Fornax Cluster host significant numbers of D…
The SXDF-ALMA 2-arcmin2 Deep Survey: Stacking Rest-frame Near-infrared Selected Objects
Tamura, Yoichi; Kohno, Kotaro; Caputi, Karina I. +24 more
We present stacking analyses on our ALMA deep 1.1 mm imaging in the Subaru/XMM-Newton Deep Survey Field using 1.6 and 3.6 µm selected galaxies in the CANDELS WFC3 catalog. We detect a stacked flux of ∼0.03-0.05 mJy, corresponding to {L}{IR}\lt {10}11 {L}⊙ and a star formation rate (SFR) of ∼ 15 {M}⊙
Young Stellar Populations in MYStIX Star-forming Regions: Candidate Protostars
Feigelson, Eric D.; Povich, Matthew S.; Getman, Konstantin V. +2 more
The Massive Young Star-Forming Complex in Infrared and X-ray (MYStIX) project provides a new census on stellar members of massive star-forming regions within 4 kpc. Here the MYStIX Infrared Excess catalog and Chandra-based X-ray photometric catalogs are mined to obtain high-quality samples of Class I protostars using criteria designed to reduce ex…
Are There Two Distinct Solar Energetic Particle Releases in the 2012 May 17 Ground Level Enhancement Event?
Li, Gang; Ding, Liu-Guan; Jiang, Yong
We examine ion release times in the solar vicinity for the 2012 May 17 Ground Level Enhancement event using the velocity dispersion analysis method. In situ energetic proton data from Solar and Heliospheric Observatory (SOHO)/Energetic and Relativistic Nuclei and Electron and Geostationary Operational Environmental Satellite are used. We find two …
An Apparent Precessing Helical Outflow from a Massive Evolved Star: Evidence for Binary Interaction
Morris, M. R.; Mills, E. A. C.; Ressler, M. E. +3 more
Massive, evolved stars play a crucial role in the metal enrichment, dust budget, and energetics of the interstellar medium; however, the details of their evolution are uncertain because of their rarity and short lifetimes before exploding as supernovae. Discrepancies between theoretical predictions from single-star evolutionary models and observat…
The Metallicity Evolution of Blue Compact Dwarf Galaxies from the Intermediate Redshift to the Local Universe
Fang, Guanwen; Kong, Xu; Lian, Jianhui +2 more
We present oxygen abundance measurements for 74 blue compact dwarf (BCD) galaxies in the redshift range of [0.2, 0.5] using the strong-line method. The spectra of these objects are taken using Hectospec on the Multiple Mirror Telescope. More than half of these BCDs had dust attenuation corrected using the Balmer decrement method. For comparison, w…