Search Publications
SMA Observations on Faint Submillimeter Galaxies with S 850 < 2 mJy: Ultra Dusty Low-luminosity Galaxies at High Redshift
Chen, Chian-Chou; Williams, Jonathan P.; Wang, Wei-Hao +2 more
We obtained Submillimeter Array (SMA) observations of eight faint (intrinsic 850 µm fluxes < 2 mJy) submillimeter galaxies (SMGs) discovered in SCUBA images of the massive lensing cluster fields A370, A2390, and A1689 and detected five. In total, we obtain five SMA detections, all of which have de-lensed fluxes <1 mJy with estimated to…
Evidence for a Constant Initial Mass Function in Early-type Galaxies Based on Their X-Ray Binary Populations
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +4 more
A number of recent studies have proposed that the stellar initial mass function (IMF) of early type galaxies varies systematically as a function of galaxy mass, with higher mass galaxies having bottom-heavy IMFs. These bottom-heavy IMFs have more low-mass stars relative to the number of high mass stars, and therefore naturally result in proportion…
Resolved Multifrequency Radio Observations of GG Tau
Wilner, D. J.; Testi, L.; Henning, Th. +20 more
We present subarcsecond resolution observations of continuum emission associated with the GG Tau quadruple star system at wavelengths of 1.3, 2.8, 7.3, and 50 mm. These data confirm that the GG Tau A binary is encircled by a circumbinary ring at a radius of 235 AU with a FWHM width of ~60 AU. We find no clear evidence for a radial gradient in the …
Evolution of the Magnetic Helicity Flux during the Formation and Eruption of Flux Ropes
Guglielmino, S. L.; Romano, P.; Zuccarello, F. P. +1 more
We describe the evolution and the magnetic helicity flux for two active regions (ARs) since their appearance on the solar disk: NOAA 11318 and NOAA 11675. Both ARs hosted the formation and destabilization of magnetic flux ropes. In the former AR, the formation of the flux rope culminated in a flare of C2.3 GOES class and a coronal mass ejection (C…
An Early Look of Comet C/2013 A1 (Siding Spring): Breathtaker or Nightmare?
Ye, Quan-Zhi; Hui, Man-To
The dynamically new comet, C/2013 A1 (Siding Spring), is to make a close approach to Mars on 2014 October 19 at 18:30 UT at a distance of 40 ± 1 Martian radii. Such an extremely rare event offers a precious opportunity for the spacecrafts on Mars to closely study a dynamically new comet itself as well as the planet-comet interaction. Meanwhile, th…
Multiwavelength Observations of Swift J1753.5-0127
Maccarone, Thomas J.; France, Kevin; Lewis, Fraser +4 more
We present contemporaneous X-ray, ultraviolet (UV), optical, and near-infrared observations of the black hole binary system Swift J1753.5-0127 acquired in 2012 October. The UV observations, obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope, are the first UV spectra of this system. The dereddened UV spectrum is characteriz…
Exploring the Prominence-Corona Connection and its Expansion into the Outer Corona Using Total Solar Eclipse Observations
Morgan, Huw; Habbal, Shadia Rifai; Druckmüller, Miloslav
Prominences constitute the most complex magnetic structures in the solar corona. The ubiquitous presence of their seemingly confined dense and cool plasma in an otherwise million-degree environment remains a puzzle. Using a decade of white light total solar eclipse observations, we show how these images reveal an intricate relationship between pro…
Physical Properties of Asteroids in Comet-like Orbits in Infrared Asteroid Survey Catalogs
Usui, Fumihiko; Kim, Yoonyoung; Ishiguro, Masateru
We investigated the population of asteroids in comet-like orbits using available asteroid size and albedo catalogs of data taken with the Infrared Astronomical Satellite, AKARI, and the Wide-field Infrared Survey Explorer on the basis of their orbital properties (i.e., the Tisserand parameter with respect to Jupiter, T J, and the apheli…
A Far-infrared Spectral Sequence of Galaxies: Trends and Models
Abel, N. P.; González-Alfonso, E.; van Hoof, P. A. M. +3 more
We present a framework for the interpretation of the far-infrared spectra of galaxies in which we have expanded the model parameters compared with previous work by varying the ionization parameter U, column density N(H), and gas density at the cloud face n(H+) for a central starburst or active galactic nucleus (AGN). We compare these mo…
Spectral and Timing Properties of the Black Hole X-Ray Binary H1743-322 in the Low/Hard State Studied with Suzaku
Yamaoka, K.; Done, C.; Yamada, S. +6 more
We report on the results from Suzaku observations of the Galactic black hole X-ray binary H1743-322 in the low/hard state during its outburst in 2012 October. We appropriately take into account the effects of dust scattering to accurately analyze the X-ray spectra. The time-averaged spectra in the 1-200 keV band are dominated by a hard power-law c…