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Almost gone: SN 2008S and NGC 300 2008OT-1 are fainter than their progenitors
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +3 more
We present late-time Hubble and Spitzer Space Telescope (SST) imaging of SN 2008S and NGC 300 2008OT-1, the prototypes of a common class of stellar transients whose true nature is debated. Both objects are still fading and are now >15 times fainter than their progenitors in the mid-IR and are undetected in the optical and near-IR. Data from the…
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…
The 2016 Feb 19 outburst of comet 67P/CG: an ESA Rosetta multi-instrument study
Jorda, L.; Lamy, P. L.; Stern, S. A. +93 more
On 2016 Feb 19, nine Rosetta instruments serendipitously observed an outburst of gas and dust from the nucleus of comet 67P/Churyumov-Gerasimenko. Among these instruments were cameras and spectrometers ranging from UV over visible to microwave wavelengths, in situ gas, dust and plasma instruments, and one dust collector. At 09:40 a dust cloud deve…
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…