Search Publications
The Electron Drift Instrument for MMS
Nakamura, R.; Baumjohann, W.; Torbert, R. B. +21 more
The Electron Drift Instrument (EDI) on the Magnetospheric Multiscale (MMS) mission measures the in-situ electric and magnetic fields using the drift of a weak beam of test electrons that, when emitted in certain directions, return to the spacecraft after one or more gyrations. This drift is related to the electric field and, to a lesser extent, th…
Spatially resolved galactic wind in lensed galaxy RCSGA 032727-132609
Rigby, Jane R.; Sharon, Keren; Bayliss, Matthew B. +4 more
We probe the spatial distribution of outflowing gas along four lines of sight separated by up to 6 kpc in a gravitationally lensed star-forming galaxy at z = 1.70. Using Mg II and Fe II emission and absorption as tracers, we find that the clumps of star formation are driving galactic outflows with velocities of -170 to -250 km s-1. The …
Homologous Jet-driven Coronal Mass Ejections from Solar Active Region 12192
Panesar, Navdeep K.; Moore, Ronald L.; Sterling, Alphonse C.
We report observations of homologous coronal jets and their coronal mass ejections (CMEs) observed by instruments onboard the Solar Dynamics Observatory (SDO) and the Solar and Heliospheric Observatory (SOHO) spacecraft. The homologous jets originated from a location with emerging and canceling magnetic field at the southeastern edge of the giant …
The MOSDEF Survey: The Strong Agreement between Hα and UV-to-FIR Star Formation Rates for z ~ 2 Star-forming Galaxies
Barro, Guillermo; Inami, Hanae; Siana, Brian +12 more
We present the first direct comparison between Balmer line and panchromatic spectral energy distribution (SED)-based star formation rates (SFRs) for z∼ 2 galaxies. For this comparison, we used 17 star-forming galaxies selected from the MOSFIRE Deep Evolution Field (MOSDEF) survey, with 3σ detections for Hα and at least two IR bands (Spitzer/MIPS 2…
Ultraluminous X-ray bursts in two ultracompact companions to nearby elliptical galaxies
Romanowsky, Aaron J.; Liu, Jifeng; Strader, Jay +8 more
A flaring X-ray source was found near the galaxy NGC 4697 (ref. 1). Two brief flares were seen, separated by four years. During each flare, the flux increased by a factor of 90 on a timescale of about one minute. There is no associated optical source at the position of the flares, but if the source was at the distance of NGC 4697, then the luminos…
Hall effect control of magnetotail dawn-dusk asymmetry: A three-dimensional global hybrid simulation
Artemyev, A. V.; Pritchett, P. L.; Wang, X. Y. +4 more
Magnetotail reconnection and related phenomena (e.g., flux ropes, dipolarizing flux bundles, flow bursts, and particle injections) occur more frequently on the duskside than on the dawnside. Because this asymmetry can directly result in dawn-dusk asymmetric space weather effects, uncovering its physical origin is important for better understanding…
Geologic context of recurring slope lineae in Melas and Coprates Chasmata, Mars
McEwen, Alfred; Chojnacki, Matthew; Ojha, Lujendra +3 more
One of the major Mars discoveries of recent years is the existence of recurring slope lineae (RSL), which suggests that liquid water occurs on or near the surface of Mars today. These dark and narrow features emerge from steep, rocky exposures and incrementally grow, fade, and reform on a seasonal basis and are detected in images from the High Res…
Revealing the accretion disc corona in Mrk 335 with multi-epoch X-ray spectroscopy
Ballantyne, D. R.; Keek, L.
Active galactic nuclei host an accretion disc with an X-ray producing corona around a supermassive black hole. In bright sources, such as the Seyfert 1 galaxy Mrk 335, reflection of the coronal emission off the accretion disc has been observed. Reflection produces spectral features such as an Fe Kα emission line, which allow for properties of the …
Aswan site on comet 67P/Churyumov-Gerasimenko: Morphology, boulder evolution, and spectrophotometry
Bertaux, Jean-Loup; Da Deppo, Vania; Naletto, Giampiero +49 more
Aims: We provide a detailed morphological analysis of the Aswan site on comet 67P/Churyumov-Gerasimenko (67P). We derive the size-frequency distribution of boulders ≥2 m and correlate this distribution with the gravitational slopes for the first time on a comet. We perform the spectral analysis of this region to understand if possible surface…
The Grism Lens-Amplified Survey from Space (GLASS). VI. Comparing the Mass and Light in MACS J0416.1-2403 Using Frontier Field Imaging and GLASS Spectroscopy
Schrabback, T.; Vulcani, B.; Hoag, A. +12 more
We present a model using both strong and weak gravitational lensing of the galaxy cluster MACS J0416.1-2403, constrained using spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS) and Hubble Frontier Fields (HFF) imaging data. We search for emission lines in known multiply imaged sources in the GLASS spectra, obtaining secure spect…