Search Publications
Constraints on Spatial Variations in the Fine-structure Constant from Planck
Cooray, Asantha; Smidt, Joseph; O'Bryan, Jon +1 more
We use the cosmic microwave background (CMB) anisotropy data from Planck to constrain the spatial fluctuations of the fine-structure constant α at a redshift of 1100. We use a quadratic estimator to measure the four-point correlation function of the CMB temperature anisotropies and extract the angular power spectrum fine-structure constant spatial…
Multi-wavelength Analysis of the Galactic Supernova Remnant MSH 11-61A
Auchettl, Katie; Slane, Patrick; Foster, Adam R. +2 more
Due to its centrally bright X-ray morphology and limb brightened radio profile, MSH 11-61A (G290.1-0.8) is classified as a mixed morphology supernova remnant (SNR). H i and CO observations determined that the SNR is interacting with molecular clouds found toward the north and southwest regions of the remnant. In this paper we report on the detecti…
The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115. III. Luminosity Functions of LMXBs and Dependence on Stellar Environments
Romanowsky, Aaron J.; Brodie, Jean P.; Remillard, Ronald A. +7 more
We studied the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-ray Visionary Project Observation. With a total exposure time of ∼1.1 Ms, we constructed the XLF down to a limiting luminosity of ∼1036 erg s-1, which is much deeper than t…
Spitzer Imaging of Strongly lensed Herschel-selected Dusty Star-forming Galaxies
Scott, D.; Wang, L.; Farrah, D. +23 more
We present the rest-frame optical spectral energy distribution (SED) and stellar masses of six Herschel-selected gravitationally lensed dusty, star-forming galaxies (DSFGs) at 1 < z < 3. These galaxies were first identified with Herschel/SPIRE imaging data from the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) and the Herschel…
Flare Footpoint Regions and a Surge Observed by Hinode/EIS, RHESSI, and SDO/AIA
Reep, J. W.; Doschek, G. A.; Warren, H. P. +2 more
The Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft observed flare footpoint regions coincident with a surge for an M3.7 flare observed on 2011 September 25 at N12 E33 in active region 11302. The flare was observed in spectral lines of O vi, Fe x, Fe xii, Fe xiv, Fe xv, Fe xvi, Fe xvii, Fe xxiii, and Fe xxiv. The EIS observ…
Photospheric Abundances of Polar Jets on the Sun Observed by Hinode
Lee, Kyoung-Sun; Brooks, David H.; Imada, Shinsuke
Many jets are detected at X-ray wavelengths in the Sun's polar regions, and the ejected plasma along the jets has been suggested to contribute mass to the fast solar wind. From in situ measurements in the magnetosphere, it has been found that the fast solar wind has photospheric abundances while the slow solar wind has coronal abundances. Therefor…
The Q/U Imaging Experiment: Polarization Measurements of the Galactic Plane at 43 and 95 GHz
Davies, R. D.; Dickinson, C.; Eriksen, H. K. +39 more
We present polarization observations of two Galactic plane fields centered on Galactic coordinates (l, b) = (0°, 0°) and (329°, 0°) at both Q (43 GHz) and W bands (95 GHz), covering between 301 and 539 square degrees depending on frequency and field. These measurements were made with the QUIET instrument between 2008 October and 2010 December, and…
Influence of a CME’s Initial Parameters on the Arrival of the Associated Interplanetary Shock at Earth and the Shock Propagational Model Version 3
Feng, X. S.; Zhao, X. H.
Predicting the arrival times of coronal mass ejections (CMEs) and their related waves at Earth is an important aspect of space weather forecasting. The Shock Propagation Model (SPM) and its updated version (SPM2), which use the initial parameters of solar flare-Type II burst events as input, have been developed to predict the shock arrival time. T…
Limits on Lyman Continuum Escape from z = 2.2 Hα-emitting Galaxies
Östlin, G.; Guaita, L.; Sandberg, A. +2 more
The leakage of Lyman continuum (LyC) photons from star-forming galaxies is an elusive parameter. When observed, it provides a wealth of information on star formation in galaxies and on the geometry of the interstellar medium, and puts constraints on the role of star-forming galaxies in the reionization of the universe. Hα-selected galaxies at z∼ 2…
Not In Our Backyard: Spectroscopic Support for the CLASH z=11 Candidate MACS 0647-JD
Pirzkal, Nor; Donahue, Megan; Frye, Brenda L. +12 more
We report on our first set of spectroscopic Hubble Space Telescope observations of the z≈ 11 candidate galaxy, which is strongly lensed by the MACSJ 0647.7+7015 galaxy cluster. The three lensed images are faint and we show that these early slitless grism observations are of sufficient depth to investigate whether this high-redshift candidate, iden…