Search Publications
Spatially resolved velocity maps of halo gas around two intermediate-redshift galaxies
Johnson, Sean D.; Chen, Hsiao-Wen; Gauthier, Jean-René +3 more
Absorption-line spectroscopy of multiply-lensed QSOs near a known foreground galaxy provides a unique opportunity to go beyond the traditional one-dimensional application of QSO probes and establish a crude three-dimensional map of halo gas around the galaxy that records the line-of-sight velocity field at different locations in the gaseous halo. …
Investigating Nearby Star-forming Galaxies in the Ultraviolet with HST/COS Spectroscopy. I. Spectral Analysis and Interstellar Abundance Determinations
Aloisi, A.; James, B. L.; Wolfe, M. A. +2 more
This is the first in a series of three papers describing a project with the Cosmic Origins Spectrograph on the Hubble Space Telescope to measure abundances of the neutral interstellar medium (ISM) in a sample of nine nearby star-forming galaxies. The goal is to assess the (in)homogeneities of the multiphase ISM in galaxies where the bulk of metals…
Effects of Meridional Flow Variations on Solar Cycles 23 and 24
Hathaway, David H.; Upton, Lisa
The faster meridional flow that preceded the solar cycle 23/24 minimum is thought to have led to weaker polar field strengths, producing the extended solar minimum and the unusually weak cycle 24. To determine the impact of meridional flow variations on the sunspot cycle, we have simulated the Sun's surface magnetic field evolution with our newly …
CLASH: z ∼ 6 young galaxy candidate quintuply lensed by the frontier field cluster RXC J2248.7-4431
Infante, L.; Zheng, W.; Molino, A. +37 more
We present a quintuply lensed z ∼ 6 candidate discovered in the field of the galaxy cluster RXC J2248.7-4431 (z ∼ 0.348) targeted within the Cluster Lensing and Supernova survey with Hubble (CLASH) and selected in the deep Hubble Space Telescope (HST) frontier fields survey. Thanks to the CLASH 16-band HST imaging, we identify the quintuply lensed…
Absorption-line Detections of 105-106 K Gas in Spiral-rich Groups of Galaxies
Kacprzak, Glenn G.; Savage, Blair D.; Shull, J. Michael +10 more
Using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope, the COS Science Team has conducted a high signal-to-noise survey of 14 bright QSOs. In a previous paper, these far-UV spectra were used to discover 14 "warm" (T >= 105 K) absorbers using a combination of broad Lyα and broad O VI absorptions. A reanalysis of a …
Bimodal distribution of sulfuric acid aerosols in the upper haze of Venus
Crisp, David; Zhang, Xi; Gao, Peter +2 more
Observations by the SPICAV/SOIR instruments aboard Venus Express have revealed that the upper haze (UH) of Venus, between 70 and 90 km, is variable on the order of days and that it is populated by two particle modes. We use a one-dimensional microphysics and vertical transport model based on the Community Aerosol and Radiation Model for Atmosphere…
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays
Maraschi, L.; Covino, S.; Antonelli, L. A. +156 more
Aims: The radio galaxy
Methods…
HerMES: point source catalogues from Herschel-SPIRE observations II
Buat, V.; Wang, L.; Bock, J. +18 more
The Herschel Multi-tiered Extragalactic Survey (HerMES) is the largest Guaranteed Time Key Programme on the Herschel Space Observatory. With a wedding cake survey strategy, it consists of nested fields with varying depth and area totalling ∼380 deg2. In this paper, we present deep point source catalogues extracted from Herschel-Spectral…
Methanol along the path from envelope to protoplanetary disc
Walsh, Catherine; Harsono, Daniel; van Dishoeck, Ewine F. +2 more
Interstellar methanol is considered to be a parent species of larger, more complex organic molecules. A physicochemical simulation of infalling parcels of matter is performed for a low-mass star-forming system to trace the chemical evolution from cloud to disc. An axisymmetric 2D semi-analytic model generates the time-dependent density and velocit…
The substorm current wedge: Further insights from MHD simulations
Hesse, M.; Birn, J.
Using a recent magnetohydrodynamic simulation of magnetotail dynamics, we further investigate the buildup and evolution of the substorm current wedge (SCW), resulting from flow bursts generated by near-tail reconnection. Each flow burst generates an individual current wedge, which includes the reduction of cross-tail current and the diversion to r…