Search Publications
The Vertical-current Approximation Nonlinear Force-free Field Code—Description, Performance Tests, and Measurements of Magnetic Energies Dissipated in Solar Flares
Aschwanden, Markus J.
In this work we provide an updated description of the Vertical-Current Approximation Nonlinear Force-Free Field (VCA-NLFFF) code, which is designed to measure the evolution of the potential, non-potential, free energies, and the dissipated magnetic energies during solar flares. This code provides a complementary and alternative method to existing …
Vetting Galactic Leavitt Law Calibrators Using Radial Velocities: On the Variability, Binarity, and Possible Parallax Error of 19 Long-period Cepheids
Holl, B.; Mowlavi, N.; Roelens, M. +9 more
We investigate the radial velocity (RV) variability and spectroscopic binarity of 19 Galactic long-period ({P}{puls} ≳ 10 days) classical Cepheid variable stars whose trigonometric parallaxes are being measured using the Hubble Space Telescope and Gaia. Our primary objective is to constrain possible parallax error due to undetected orbi…
Powerful Activity in the Bright Ages. I. A Visible/IR Survey of High Redshift 3C Radio Galaxies and Quasars
Macchetto, F. D.; Capetti, A.; Sparks, W. B. +10 more
We present new rest-frame UV and visible observations of 22 high-z (1 < z < 2.5) 3C radio galaxies and QSOs obtained with the Hubble Space Telescope's Wide Field Camera 3 instrument. Using a custom data reduction strategy in order to assure the removal of cosmic rays, persistence signal, and other data artifacts, we have produced high-qualit…
The UBV Color Evolution of Classical Novae. II. Color-Magnitude Diagram
Kato, Mariko; Hachisu, Izumi
We have examined the outburst tracks of 40 novae in the color-magnitude diagram (intrinsic B - V color versus absolute V magnitude). After reaching the optical maximum, each nova generally evolves toward blue from the upper right to the lower left and then turns back toward the right. The 40 tracks are categorized into one of six templates: very f…
HERUS: A CO Atlas from SPIRE Spectroscopy of Local ULIRGs
Lebouteiller, Vianney; Cormier, Diane; Pearson, Chris +10 more
We present the Herschel SPIRE Fourier Transform Spectroscopy (FTS) atlas for a complete flux-limited sample of local ultraluminous infrared galaxies (ULIRGs) as part of the HERschel Ultra Luminous InfraRed Galaxy Survey (HERUS). The data reduction is described in detail and was optimized for faint FTS sources ,with particular care being taken for …
Gas of 96 Planck Cold Clumps in the Second Quadrant
Liu, Tie; Wu, Yuefang; Meng, Fanyi +1 more
Ninety-six Planck cold dust clumps in the second quadrant were mapped with 12CO (1-0), 13CO (1-0), and C18O (1-0) lines at the 13.7 m telescope of Purple Mountain Observatory. 12CO (1-0) and 13CO (1-0) emissions were detected for all 96 clumps, while C18O (1-0) emissions were detect…
The Impact of JWST Broadband Filter Choice on Photometric Redshift Estimation
Ilbert, O.; Nørgaard-Nielsen, H. U.; Colina, L. +8 more
The determination of galaxy redshifts in the James Webb Space Telescope’s (JWST) blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST’s Near-Infrared Camera (NIRCam) at 0.6-5.0 µm and Mid Infrared Instrument (MIRI) at λ > 5.0 µ {{m}}. In this work we analyze the impact of choosing differe…
Discovery of γ-Ray Emission from the Radio-intermediate Quasar III Zw 2: Violent Jet Activity with Intraday γ-Ray Variability
Weng, Shan-Shan; Chen, Liang; Fan, Yi-Zhong +4 more
III Zw 2 is the prototype of radio-intermediate quasars. Although there is the evidence of possessing strong jet, significant γ-ray emission has not been reported before. In this work, we carry out a detailed analysis of the latest Fermi-LAT Pass 8 data. No significant γ-ray signal has been detected in the time-averaged 7-year Fermi-LAT data of II…
Identification of z ≳ 2 Herschel 500 µM Sources Using Color Deconfusion
Elbaz, D.; Ferguson, H. C.; Leiton, R. +19 more
We present a new method to search for candidate z ≳ 2 Herschel 500 µm sources in the Great Observatories Origins Deep Survey-North field using a S500 µm/S24 µm “color deconfusion” technique. Potential high-z sources are selected against low-redshift ones from their large 500 to 24 µm flux density ratio…
Spectroscopic Survey of G and K Dwarfs in the Hipparcos Catalog. I. Comparison between the Hipparcos and Photometric Parallaxes
Lee, Young Sun; Stauffer, John R.; Terndrup, Donald M. +3 more
The tension between the Hipparcos parallax of the Pleiades and other independent distance estimates continues even after the new reduction of the Hipparcos astrometric data and the development of a new geometric distance measurement for the cluster. A short Pleiades distance from the Hipparcos parallax predicts a number of stars in the solar neigh…