Search Publications
A Subaru Weak-Lensing Survey. I. Cluster Candidates and Spectroscopic Verification
Refregier, Alexandre; Ellis, Richard S.; Miyazaki, Satoshi +4 more
We present the results of an ongoing weak-lensing survey conducted with the Subaru Telescope whose initial goal is to locate and study the distribution of shear-selected structures, or halos. Using a Suprime-Cam imaging survey spanning 21.82 deg2, we present a catalog of 100 candidate halos located from lensing-convergence maps. Our sam…
The SSS Phase of RS Ophiuchi Observed with Chandra and XMM-Newton. I. Data and Preliminary Modeling
Ness, J. -U.; Gehrz, R. D.; Gonzalez-Riestra, R. +13 more
The phase of supersoft source (SSS) emission of the sixth recorded outburst of the recurrent nova RS Oph was observed on days 39.7 and 66.9 after outburst with Chandra and on day 54.0 with XMM-Newton. A ~35 s period on day 54.0 originates from the SSS emission and not from the shock. We discuss the bound-free absorption by neutral elements in the …
A Floor in the Solar Wind Magnetic Field
Cliver, E. W.; Svalgaard, L.
Long-term (~130 years) reconstruction of the interplanetary magnetic field (IMF) based on geomagnetic indices indicates that the solar wind magnetic field strength has a ``floor,'' a baseline value in annual averages that it approaches at each 11 yr solar minimum. In the ecliptic plane at 1 AU, the IMF floor is ~4.6 nT, a value substantiated by di…
On the Origin of Three Seismic Sources in the Proton-rich Flare of 2003 October 28
Zharkova, Valentina V.; Zharkov, Sergei I.
The three seismic sources, S1, S2, and S3, detected from MDI Dopplergrams using the time-distance (TD) diagram technique are presented with the locations, areas, and vertical and horizontal velocities of the visible wave displacements. Within the data cube of 120 Mm, the horizontal velocities and the wave propagation times vary slightly from sourc…
Investigating the Nuclear Obscuration in Two Types of Seyfert 2 Galaxies
Shu, X. W.; Wang, J. X.; Jiang, P. +2 more
We build a large sample of Seyfert 2 galaxies (Sy2s) with both optical spectropolarimetric and X-ray data available, in which 29 of the Sy2s have a detection of polarized broad emission lines (PBLs) and 25 do not. We find that for luminous Sy2s with L[OIII>1041 ergs s-1, sources with PBLs have smaller X-ray abso…
Probing the Formation of Low-Mass X-Ray Binaries in Globular Clusters and the Field
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J.
We present an analysis of LMXBs and GCs in five early-type galaxies using Chandra X-ray and HST optical data. Of the 186 LMXBs within the optical fields of view, 71 are in GCs, confirming that LMXBs are formed particularly efficiently in clusters due to dynamical interactions. However, there is no statistically significant correlation between the …
Spitzer Space Telescope Observations of Kepler's Supernova Remnant: A Detailed Look at the Circumstellar Dust Component
Blair, William P.; Reynolds, Stephen P.; Ghavamian, Parviz +4 more
We present 3.6-160 µm infrared images of Kepler's supernova remnant (SN 1604) obtained with the IRAC and MIPS instruments on the Spitzer Space Telescope. We also present MIPS SED low-resolution spectra in the 55-95 µm region. The observed emission in the MIPS 24 µm band shows the entire shell. Emission in the MIPS 70 µm and…
Dependence of Galaxy Structure on Rest-Frame Wavelength and Galaxy Type
Conselice, Christopher J.; Windhorst, Rogier A.; Jansen, Rolf A. +1 more
We present a quantitative analysis of the morphologies for 199 nearby galaxies as parameterized with measurements of the concentration, asymmetry, and clumpiness (CAS) parameters at wavelengths from 0.15 to 0.85 µm. We find that these CAS parameters depend on both galaxy type and the wavelength of observation. As such, we use them to obtain …
Magnetic Field Strength in the Solar Corona from Type II Band Splitting
Cho, K. -S.; Moon, Y. -J.; Gary, D. E. +2 more
The phenomenon of band splitting in type II bursts can be a unique diagnostic for the magnetic field in the corona, which is, however, inevitably sensitive to the ambient density. We apply this diagnostic to the CME-flare event on 2004 August 18, for which we are able to locate the propagation of the type II burst and determine the ambient coronal…
Relativistic Iron K Emission and Absorption in the Seyfert 1.9 Galaxy MCG -5-23-16
Ptak, A.; Nandra, K.; Turner, T. J. +9 more
We present the results of the simultaneous deep XMM-Newton and Chandra observations of the bright Seyfert 1.9 galaxy MCG -5-23-16, which is thought to have one of the best known examples of a relativistically broadened iron Kα line. The time-averaged spectral analysis shows that the iron K-shell complex is best modeled with an unresolved narrow em…