Search Publications
The Hidden Fortress: structure and substructure of the complex strong lensing cluster SDSS J1029+2623
Schrabback, Tim; Oguri, Masamune; Kochanek, Christopher S. +8 more
We present Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) observations of SDSS J1029+2623, a three-image quasar lens system produced by a foreground cluster at z = 0.584. Our strong lensing analysis reveals six additional multiply imaged galaxies in addition to the multiply imaged quasar. We confirm t…
Probing the IGM-galaxy connection at z < 0.5 - II. New insights into the galaxy environments of O VI absorbers in PKS 0405-123
Johnson, Sean D.; Chen, Hsiao-Wen; Mulchaey, John S.
We present new absorption-line analysis and new galaxy survey data obtained for the field around PKS 0405-123 at zQSO = 0.57. Combining previously known O VI absorbers with new identifications in the higher S/N ultraviolet (UV) spectra obtained with the Cosmic Origins Spectrograph, we have established a sample of 7 O VI absorbers and 12…
Isothermal dust models of Herschel-ATLAS galaxies
Clements, D. L.; Cooray, A.; Ibar, E. +18 more
We use galaxies from the Herschel-ATLAS (H-ATLAS) survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity index of 250 µm selected galaxies in the local Universe (z < 0.5). As well as simple far-infrared spectral energy dist…
Estimates of seismic activity in the Cerberus Fossae region of Mars
Teanby, N. A.; Taylor, J.; Wookey, J.
The 2016 NASA InSight lander is the first planetary mission designed to study the deep interior of Mars. InSight's Seismic Experiment for Interior Structure (SEIS) package will quantify global and regional seismic activity and determine parameters like core properties, mantle composition, and Martian lithospheric thickness. An improved understandi…
The Coldest Brown Dwarf (or Free-floating Planet)?: The Y Dwarf WISE 1828+2650
Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R. +4 more
We have monitored the position of the cool Y dwarf WISEPA J182831.08+265037.8 using a combination of ground- and space-based telescopes and have determined its distance to be 11.2+1.3 -1.0 pc. Its absolute H magnitude, MH = 22.21+0.25 -0.22 mag, suggests a mass in the range 0.5-20 M Jup
Statistical Properties of Galactic δ Scuti Stars: Revisited
Byun, Y. -I.; Kim, D. -W.; Protopapas, P. +1 more
We present statistical characteristics of 1578 δ Scuti stars including nearby field stars and cluster member stars within the Milky Way. We obtained 46% of these stars (718 stars) from work by Rodríguez and collected the remaining 54% of stars (860 stars) from other literature. We updated the entries with the latest information of sky coordinates,…
The Afterglow and ULIRG Host Galaxy of the Dark Short GRB 120804A
Menten, K. M.; Berger, E.; Chornock, R. +12 more
We present the optical discovery and subarcsecond optical and X-ray localization of the afterglow of the short GRB 120804A, as well as optical, near-IR, and radio detections of its host galaxy. X-ray observations with Swift/XRT, Chandra, and XMM-Newton extending to δt ≈ 19 days reveal a single power-law decline. The optical afterglow is faint, and…
Measuring X-Ray Variability in Faint/Sparsely Sampled Active Galactic Nuclei
Pinto, C.; Allevato, V.; Paolillo, M. +1 more
We study the statistical properties of the normalized excess variance of variability process characterized by a "red-noise" power spectral density (PSD), as in the case of active galactic nuclei (AGNs). We perform Monte Carlo simulations of light curves, assuming both a continuous and a sparse sampling pattern and various signal-to-noise ratios (S…
Regional Variations in the Dense Gas Heating and Cooling in M51 from Herschel Far-infrared Spectroscopy
Boquien, M.; Roussel, H.; Cooray, A. +13 more
We present Herschel PACS and SPIRE spectroscopy of the most important far-infrared cooling lines in M51, [C II](158 µm), [N II](122 and 205 µm), [O I](63 and 145 µm), and [O III](88 µm). We compare the observed flux of these lines with the predicted flux from a photon-dominated region model to determine characteristics of t…
Discontinuities and Alfvénic fluctuations in the solar wind
Haaland, S.; Paschmann, G.; Knetter, T. +1 more
We examine the Alfvénicity of a set of 188 solar wind directional discontinuities (DDs) identified in the Cluster data from 2003 by Knetter (2005), with the objective of separating rotational discontinuities (RDs) from tangential ones (TDs). The DDs occurred over the full range of solar wind velocities and magnetic shear angles. By performing the …