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Anomalous microwave emission from spinning nanodiamonds around stars
Frayer, D. T.; Smith, A. M. S.; Greaves, J. S. +3 more
Several interstellar environments produce anomalous microwave emission (AME), with brightness peaks at tens-of-gigahertz frequencies1. The emission's origins are uncertain; rapidly spinning nanoparticles could emit electric-dipole radiation2, but the polycyclic aromatic hydrocarbons that have been proposed as the carrier are …
How the IMF By Induces a Local By Component During Northward IMF Bz and Characteristic Timescales
Snekvik, K.; Østgaard, N.; Tenfjord, P. +7 more
We use the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) By component on the coupling between the solar wind and magnetosphere-ionosphere system when IMF Bz>0. We describe the evolution of how a magnetospheric By component is induced on clos…
Mass determination of the 1:3:5 near-resonant planets transiting GJ 9827 (K2-135)
Alonso, R.; Deeg, H.; Erikson, A. +40 more
Context. Multiplanet systems are excellent laboratories to test planet formation models as all planets are formed under the same initial conditions. In this context, systems transiting bright stars can play a key role, since planetary masses, radii, and bulk densities can be measured.
Aims: GJ 9827 (K2-135) has recently been found to host a t…
Molecular Gas Filaments and Star-forming Knots Beneath an X-Ray Cavity in RXC J1504-0248
Fabian, A. C.; Combes, F.; McDonald, M. +6 more
We present recent ALMA observations of the CO (1-0) and CO (3-2) emission lines in the brightest cluster galaxy of RXC J1504.1-0248, which is one of the most extreme cool core clusters known. The central galaxy contains 1.9× {10}10 {M}⊙ of molecular gas. The molecular gas morphology is complex and disturbed, showing no evide…
Cross-calibration of CO- versus dust-based gas masses and assessment of the dynamical mass budget in Herschel-SDSS Stripe82 galaxies
Saintonge, Amélie; Wuyts, Stijn; Förster Schreiber, Natascha M. +7 more
We present a cross-calibration of CO- and dust-based molecular gas masses at z ≤ 0.2. Our results are based on a survey with the IRAM 30-m telescope collecting CO(1-0) measurements of 78 massive (logM⋆/M⊙> 10) galaxies with known gas-phase metallicities and with IR photometric coverage from Wide-field Infrared Survey Explo…
A Si IV/O IV Electron Density Diagnostic for the Analysis of IRIS Solar Spectra
Peter, H.; Young, P. R.; Keenan, F. P. +1 more
Solar spectra of ultraviolet bursts and flare ribbons from the Interface Region Imaging Spectrograph (IRIS) have suggested high electron densities of > {10}12 cm-3 at transition region temperatures of 0.1 MK, based on large intensity ratios of Si IV λ1402.77 to O IV λ1401.16. In this work, a rare observation of the weak O …
PRIMASS visits Hilda and Cybele groups
De Prá, M. N.; Pinilla-Alonso, N.; Carvano, J. M. +5 more
The Cybele and Hilda dynamical groups delimit the outer edge of the asteroid belt. Their compositional distribution is a key element to constrain evolutionary models of the Solar System. In this paper, we present a compositional analysis of these populations using spectroscopic observations, SDSS and NEOWISE data. As part of the PRIMASS (Primitive…
Helium abundance and speed difference between helium ions and protons in the solar wind from coronal holes, active regions, and quiet Sun
Fu, Hui; Madjarska, Maria S.; Li, Bo +2 more
Two main models have been developed to explain the mechanisms of release, heating, and acceleration of the nascent solar wind, the wave-turbulence-driven (WTD) models and reconnection-loop-opening (RLO) models, in which the plasma release processes are fundamentally different. Given that the statistical observational properties of helium ions prod…
A SITELLE view of M31's central region - I. Calibrations and radial velocity catalogue of nearly 800 emission-line point-like sources
Drissen, Laurent; Martin, Thomas B.; Melchior, Anne-Laure
We present a detailed description of the wavelength, astrometric and photometric calibration plan for SITELLE, the imaging Fourier transform spectrometer attached to the Canada-France-Hawaii telescope, based on observations of a red (647-685 nm) data cube of the central region (11 arcmin × 11 arcmin) of M 31. The first application, presented in th…
The ALMA Frontier Fields Survey. IV. Lensing-corrected 1.1 mm number counts in Abell 2744, MACS J0416.1-2403 and MACS J1149.5+2223
Kneissl, R.; Demarco, R.; Laporte, N. +15 more
Context. Characterizing the number counts of faint (i.e., sub-mJy and especially sub-100 µJy), dusty star-forming galaxies is currently a challenge even for deep, high-resolution observations in the FIR-to-mm regime. They are predicted to account for approximately half of the total extragalactic background light at those wavelengths. Searchi…