Search Publications
New Fe I Level Energies and Line Identifications from Stellar Spectra. II. Initial Results from New Ultraviolet Spectra of Metal-poor Stars
Ayres, Thomas R.; Peterson, Ruth C.; Kurucz, Robert L.
The Fe I spectrum is critical to many areas of astrophysics, yet many of the high-lying levels remain uncharacterized. To remedy this deficiency, Peterson & Kurucz identified Fe I lines in archival ultraviolet and optical spectra of metal-poor stars, whose warm temperatures favor moderate Fe I excitation. Sixty-five new levels were recovered, …
Insights from Synthetic Star-forming Regions. I. Reliable Mock Observations from SPH Simulations
Dale, James E.; Robitaille, Thomas P.; Koepferl, Christine M. +1 more
Through synthetic observations of a hydrodynamical simulation of an evolving star-forming region, we assess how the choice of observational techniques affects the measurements of properties that trace star formation. Testing and calibrating observational measurements requires synthetic observations that are as realistic as possible. In this part o…
Wayne—A Simulator for HST WFC3 IR Grism Spectroscopy
Tsiaras, A.; Varley, R.; Karpouzas, K.
Wayne is an algorithm that simulates Hubble Space Telescope Wide Field Camera 3 (WFC3) grism spectroscopic frames, including sources of noise and systematics. It can simulate both staring and spatial scan modes, and observations such as the transit and the eclipse of an exoplanet. Unlike many other instrument simulators, the focus of Wayne is on c…
A Large Catalog of Homogeneous Ultra-Violet/Optical GRB Afterglows: Temporal and Spectral Evolution
Gronwall, Caryl; Kuin, N. P. M.; Roming, Peter W. A. +10 more
We present the second Swift Ultra-Violet/Optical Telescope (UVOT) gamma-ray burst (GRB) afterglow catalog, greatly expanding on the first Swift UVOT GRB afterglow catalog. The second catalog is constructed from a database containing over 120,000 independent UVOT observations of 538 GRBs first detected by Swift, the High Energy Transient Explorer 2…
Galactic Sources Detected in the NuSTAR Serendipitous Survey
Hailey, Charles J.; Mori, Kaya; Aird, James +13 more
The Nuclear Spectroscopic Telescope Array (NuSTAR) provides an improvement in sensitivity at energies above 10 keV by two orders of magnitude over non-focusing satellites, making it possible to probe deeper into the Galaxy and universe. Lansbury and collaborators recently completed a catalog of 497 sources serendipitously detected in the 3-24 keV …
Star Formation Conditions in a Planck Galactic Cold Clump, G108.84-00.81
Kim, Kee-Tae; Lee, Jeong-Eun; Liu, Tie +6 more
We present the results from a series of ground-based radio observations toward a Planck Galactic Cold Clump (PGCC), PGCC G108.84-00.81, which is located in one curved filamentary cloud in the vicinity of an extended H II region Sh2-152 and SNR G109.1-1.0. PGCC G108.84-00.81 is mainly composed of two clumps, “G108-N” and “G108-S”. In the 850 µ…
Exploring the SDSS Data Set with Linked Scatter Plots. I. EMP, CEMP, and CV Stars
Carbon, Duane F.; Henze, Christopher; Nelson, Bron C.
We present the results of a search for extremely metal-poor (EMP), carbon-enhanced metal-poor (CEMP), and cataclysmic variable (CV) stars using a new exploration tool based on linked scatter plots (LSPs). Our approach is especially designed to work with very large spectrum data sets such as the SDSS, LAMOST, RAVE, and Gaia data sets, and it can be…
An Improved Method for Determining the Integrated Properties of Nuclear Rings: NGC 1512
Ho, Luis C.; de Grijs, Richard; Ma, Chao
The integrated properties of nuclear rings are correlated with the secular evolution and dynamics of the host galaxies of the rings, as well as with the formation and evolution of the rings’ star cluster population(s). Here we present a new method to accurately measure the spectral energy distribution and current star formation rate (SFR) of the n…
The InterPlanetary Network Supplement to the Second Fermi GBM Catalog of Cosmic Gamma-Ray Bursts
Zhang, X.; Cline, T.; Hurley, K. +32 more
InterPlanetary Network (IPN) data are presented for the gamma-ray bursts in the second Fermi Gamma-Ray Burst Monitor (GBM) catalog. Of the 462 bursts in that catalog between 2010 July 12 and 2012 July 11, 428, or 93%, were observed by at least 1 other instrument in the 9-spacecraft IPN. Of the 428, the localizations of 165 could be improved by tri…
Measuring Filament Orientation: A New Quantitative, Local Approach
Green, C. -E.; Dawson, J. R.; Cunningham, M. R. +3 more
The relative orientation between filamentary structures in molecular clouds and the ambient magnetic field provides insight into filament formation and stability. To calculate the relative orientation, a measurement of filament orientation is first required. We propose a new method to calculate the orientation of the one-pixel-wide filament skelet…