Search Publications
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…
CLASH: Extreme Emission-line Galaxies and Their Implication on Selection of High-redshift Galaxies
Donahue, Megan; Broadhurst, Tom; Frye, Brenda L. +23 more
We utilize the Cluster Lensing And Supernova survey with Hubble observations of 25 clusters to search for extreme emission-line galaxies (EELGs). The selections are carried out in two central bands: F105W (Y 105) and F125W (J 125), as the flux of the central bands could be enhanced by the presence of [O III] λλ4959, 5007 at r…
A Combined Spitzer and Herschel Infrared Study of Gas and Dust in the Circumbinary Disk Orbiting V4046 Sgr
Kastner, Joel H.; Wilner, David; Andrews, Sean +6 more
We present results from a spectroscopic Spitzer and Herschel mid-to-far-infrared study of the circumbinary disk orbiting the evolved (age ∼12-23 Myr) close binary T Tauri system V4046 Sgr. Spitzer InfraRed Spectrograph spectra show emission lines of [Ne ii], H2 S(1), CO2, and HCN, while Herschel Photodetector Array Camera and…