Search Publications
Evidence for Intermediate Polars as the Origin of the Galactic Center Hard X-ray Emission
Hailey, Charles J.; Mori, Kaya; Zhang, Shuo +14 more
Recently, unresolved hard (20-40 keV) X-ray emission has been discovered within the central 10 pc of the Galaxy, possibly indicating a large population of intermediate polars (IPs). Chandra and XMM-Newton measurements in the surrounding ∼50 pc imply a much lighter population of IPs with < {M}{{WD}}> ≈ 0.5{M}⊙ . Here we …
Dissecting the High-z Interstellar Medium through Intensity Mapping Cross-correlations
Lagache, Guilaine; Doré, Olivier; Serra, Paolo
We explore the detection, with upcoming spectroscopic surveys, of three-dimensional power spectra of emission line fluctuations produced in different phases of the interstellar medium (ISM) by forbidden transitions of ionized carbon [C II] (157.7 µm), ionized nitrogen [N II] (121.9 and 205.2 µm), and neutral oxygen [O I] (145.5 µ…
A Case Against Spinning PAHs as the Source of the Anomalous Microwave Emission
Meisner, Aaron M.; Draine, B. T.; Hensley, Brandon S.
We employ an all-sky map of the anomalous microwave emission (AME) produced by component separation of the microwave sky to study correlations between the AME and Galactic dust properties. We find that while the AME is highly correlated with all tracers of dust emission, the best predictor of the AME strength is the dust radiance. Fluctuations in …
NuSTAR Hard X-Ray Survey of the Galactic Center Region. II. X-Ray Point Sources
Hailey, Charles J.; Mori, Kaya; Giommi, Paolo +41 more
We present the first survey results of hard X-ray point sources in the Galactic Center (GC) region by NuSTAR. We have discovered 70 hard (3-79 keV) X-ray point sources in a 0.6 deg{}2 region around Sgr A* with a total exposure of 1.7 Ms, and 7 sources in the Sgr B2 field with 300 ks. We identify clear Chandra counterparts for 58 NuSTAR …
Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star
Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn
As part of Villanova's Living with a Red Dwarf program, we have obtained UV, X-ray, and optical data of the Population II red dwarf -- Kapteyn's Star. Kapteyn's Star is noteworthy for its large proper motions and high radial velocity of ∼+245 km s-1. As the nearest Pop II red dwarf, it serves as an old age anchor for calibrating activit…
The Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4)
Oey, M. S.; Parker, J. Wm.; Kiminki, D. C. +4 more
We present the Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4), a spatially complete survey of uniformly selected field OB stars that covers the entire star-forming body of the Small Magellanic Cloud (SMC). Using the IMACS (Inamori-Magellan Areal Camera and Spectrograph) multislit spectrograph and MIKE (Magellan Inamori …
Relationship of EUV Irradiance Coronal Dimming Slope and Depth to Coronal Mass Ejection Speed and Mass
Vourlidas, Angelos; Colaninno, Robin C.; Woods, Thomas N. +3 more
Extreme ultraviolet (EUV) coronal dimmings are often observed in response to solar eruptive events. These phenomena can be generated via several different physical processes. For space weather, the most important of these is the temporary void left behind by a coronal mass ejection (CME). Massive, fast CMEs tend to leave behind a darker void that …
The SCUBA-2 Cosmology Legacy Survey: Multiwavelength Counterparts to 103 Submillimeter Galaxies in the UKIDSS-UDS Field
Zavala, Jorge A.; Smail, Ian; Conselice, Christopher J. +20 more
We present multiwavelength identifications for the counterparts of 1088 submillimeter sources detected at 850 µm in the SCUBA-2 Cosmology Legacy Survey study of the UKIRT Infrared Deep Sky Survey-Ultra-Deep Survey (UDS) field. By utilizing an Atacama Large Millimeter Array (ALMA) pilot study on a subset of our bright SCUBA-2 sample as a trai…
Detection of a Possible X-Ray Quasi-periodic Oscillation in the Active Galactic Nucleus 1H 0707-495
Yuan, Weimin; Zhang, Shuang-Nan; Pan, Hai-Wu +4 more
The quasi-periodic oscillation (QPO) detected in the X-ray radiation of black hole X-ray binaries (BHXBs) is thought to originate from dynamical processes in close vicinity of black holes (BHs), and thus carries important physical information therein. Such a feature is extremely rare in active galactic nuclei (AGNs) with supermassive BHs. Here we …
The Panchromatic Hubble Andromeda Treasury. XV. The BEAST: Bayesian Extinction and Stellar Tool
Bell, Eric F.; Skillman, Evan D.; Williams, Benjamin F. +17 more
We present the Bayesian Extinction And Stellar Tool (BEAST), a probabilistic approach to modeling the dust extinguished photometric spectral energy distribution of an individual star while accounting for observational uncertainties common to large resolved star surveys. Given a set of photometric measurements and an observational uncertainty model…