Search Publications
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 …
The dust-scattering component of X-ray extinction: effects on continuum fitting and high-resolution absorption edge structure
García, J.; Wilms, J.; Baganoff, F. +1 more
Small angle scattering by dust grains causes a significant contribution to the total interstellar extinction for any X-ray instrument with sub-arcminute resolution (Chandra, Swift, XMM-Newton). However, the dust-scattering component is not included in the current absorption models: phabs, TBabs, and TBnew. We simulate a large number of Chandra spe…
What Can We Learn about Magnetotail Reconnection from 2D PIC Harris-Sheet Simulations?
Goldman, M. V.; Newman, D. L.; Lapenta, G.
The Magnetosphere Multiscale Mission (MMS) will provide the first opportunity to probe electron-scale physics during magnetic reconnection in Earth's magnetopause and magnetotail. This article will address only tail reconnection—as a non-steady-state process in which the first reconnected field lines advance away from the x-point in flux pile-up f…
Planck intermediate results. XXXIX. The Planck list of high-redshift source candidates
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +188 more
The Planck mission, thanks to its large frequency range and all-sky coverage, has a unique potential for systematically detecting the brightest, and rarest, submillimetre sources on the sky, including distant objects in the high-redshift Universe traced by their dust emission. A novel method, based on a component-separation procedure using a combi…
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 …
Another piece of the puzzle: The fast H I outflow in Mrk 231
Veilleux, Sylvain; Morganti, Raffaella; Oosterloo, Tom +2 more
We present the detection, performed with the Westerbork Synthesis Radio Telescope (WSRT) and the Karl Jansky Very Large Array (VLA), of a fast H I 21 cm outflow in the ultra-luminous infrared galaxy Mrk 231. The outflow is observed as shallow H I absorption blueshifted ~1300 km s-1 with respect to the systemic velocity and located again…
Impacts of dark energy on weighing neutrinos: Mass hierarchies considered
Zhang, Xin; Wang, Sai; Wang, Yi-Fan +1 more
Taking into account the mass splittings between three active neutrinos, we investigate the impacts of dark energy on constraining the total neutrino mass ∑mν by using recent cosmological observations. We consider two typical dark energy models, namely, the w CDM model and the holographic dark energy (HDE) model, which both have an addit…
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 …
Quantifying the UV-continuum slopes of galaxies to z ∼ 10 using deep Hubble+Spitzer/IRAC observations
Wilkins, Stephen M.; Labbé, Ivo; Bouwens, Rychard J. +5 more
Measurements of the UV-continuum slopes β provide valuable information on the physical properties of galaxies forming in the early universe, probing the dust reddening, age, metal content, and even the escape fraction. While constraints on these slopes generally become more challenging at higher redshifts as the UV-continuum shifts out of the Hubb…