Search Publications
Star Formation Rate and Extinction in Faint z ~ 4 Lyman Break Galaxies
Owen, Frazer N.; Wang, Wei-Hao; To, Chun-Hao
We present a statistical detection of 1.5 GHz radio continuum emission from a sample of faint z ~ 4 Lyman break galaxies (LBGs). To constrain their extinction and intrinsic star formation rate (SFR), we combine the latest ultradeep Very Large Array 1.5 GHz radio image and the Hubble Space Telescope Advanced Camera for Surveys (ACS) optical images …
Short-term Variability of X-Rays from Accreting Neutron Star Vela X-1. II. Monte Carlo Modeling
Makishima, Kazuo; Takahashi, Tadayuki; Odaka, Hirokazu +3 more
We develop a Monte Carlo Comptonization model for the X-ray spectrum of accretion-powered pulsars. Simple, spherical, thermal Comptonization models give harder spectra for higher optical depth, while the observational data from Vela X-1 show that the spectra are harder at higher luminosity. This suggests a physical interpretation where the optical…
PdBI Cold Dust Imaging of Two Extremely Red H - [4.5] > 4 Galaxies Discovered with SEDS and CANDELS
Dunlop, J. S.; Castellano, M.; Krips, M. +11 more
We report Plateau de Bure Interferometer (PdBI) 1.1 mm continuum imaging toward two extremely red H - [4.5] > 4 (AB) galaxies at z > 3, which we have previously discovered making use of Spitzer SEDS and Hubble Space Telescope CANDELS ultra-deep images of the Ultra Deep Survey field. One of our objects is detected on the PdBI map with a 4.3σ …
Investigating CXOU J163802.6-471358: A New Pulsar Wind Nebula in the Norma Region?
Kaspi, Victoria M.; Tomsick, John A.; Gotthelf, Eric V. +2 more
We present the first analysis of the extended source CXOU J163802.6-471358, which was discovered serendipitously during the Chandra X-ray survey of the Norma region of the Galactic spiral arms. The X-ray source exhibits a cometary appearance with a point source and an extended tail region. The complete source spectrum is fitted well with an absorb…
Three-dimensional Stereoscopic Analysis of a Coronal Mass Ejection and Comparison with UV Spectroscopic Data
Susino, Roberto; Bemporad, Alessandro; Dolei, Sergio
A three-dimensional (3D) reconstruction of the 2007 May 20 partial-halo coronal mass ejection (CME) has been made using STEREO/EUVI and STEREO/COR1 coronagraphic images. The trajectory and kinematics of the erupting filament have been derived from Extreme Ultraviolet Imager (EUVI) image pairs with the "tie-pointing" triangulation technique, while …
Herschel Extreme Lensing Line Observations: Dynamics of Two Strongly Lensed Star-forming Galaxies near Redshift z = 2
Carilli, Chris; Strauss, Michael A.; Frye, Brenda +11 more
We report on two regularly rotating galaxies at redshift z ≈ 2, using high-resolution spectra of the bright [C II] 158 µm emission line from the HIFI instrument on the Herschel Space Observatory. Both SDSS090122.37+181432.3 ("S0901") and SDSSJ120602.09+514229.5 ("the Clone") are strongly lensed and show the double-horned line profile that is…
On the Area Expansion of Magnetic Flux Tubes in Solar Active Regions
Cirtain, Jonathan W.; Dudík, Jaroslav; Dzifčáková, Elena
We calculated the three-dimensional (3D) distribution of the area expansion factors in a potential magnetic field, extrapolated from the high-resolution Hinode/SOT magnetogram of the quiescent active region NOAA 11482. Retaining only closed loops within the computational box, we show that the distribution of area expansion factors show significant…
On the X-Ray Variability of Magnetar 1RXS J170849.0-400910
Gehrels, N.; Kennea, J. A.; Beardmore, A. P. +4 more
We present a long-term X-ray flux and spectral analysis for 1RXS J170849.0-400910 using the Swift/X-Ray Telescope spanning over eight years from 2005 to 2013. We also analyze two observations from Chandra and XMM in the period from 2003 to 2004. In this ten-year period, 1RXS J170849.0-400910 displayed several rotational glitches. Previous studies …
Abundance Patterns in the Interstellar Medium of Early-type Galaxies Observed with Suzaku
Matsushita, Kyoko; Tamagawa, Toru; Nagino, Ryo +1 more
We have analyzed 17 early-type galaxies, 13 ellipticals and 4 S0 galaxies, observed with Suzaku, and investigated metal abundances (O, Mg, Si, and Fe) and abundance ratios (O/Fe, Mg/Fe, and Si/Fe) in the interstellar medium (ISM). The emission from each on-source region, which is four times the effective radius, r e, is reproduced with …
Photon-dominated Region Modeling of the [C I], [C II], and CO Line Emission from a Boundary in the Taurus Molecular Cloud
Goldsmith, Paul F.; Pineda, Jorge L.; Orr, Matthew E.
We present [C I] and [C II] observations of a linear edge region in the Taurus molecular cloud, and model this region as a cylindrically symmetric photon-dominated region (PDR) exposed to a low-intensity UV radiation field. The sharp, long profile of the linear edge makes it an ideal case to test PDR models and determine cloud parameters. We compa…