Search Publications
ALMA Uncovers Highly Filamentary Structure toward the Sgr E Region
Mills, E. A. C.; Anderson, L. D.; Battersby, C. +7 more
We report on the discovery of linear filaments observed in the CO(1-0) emission for a ~2' field of view toward the Sgr E star-forming region, centered at (l, b) = (358.°720, 0.°011). The Sgr E region is thought to be at the turbulent intersection of the "far dust lane" associated with the Galactic bar and the Central Molecular Zone (CMZ). This reg…
Orbital Observations of a Marker Horizon at Gale Crater
Arvidson, Raymond E.; Weitz, Catherine M.; Grant, John A. +5 more
A dark-toned, indurated, smooth horizon, and (or) bed (herein called "marker horizon") is exposed across much of the northwestern, southwestern, and southeastern portions of Mount Sharp in Gale crater. Compact Reconnaissance Imaging Spectrometer for Mars spectra taken from the marker horizon exhibit evidence for the presence of high calcium pyroxe…
X-ray flares of the young planet host Ds Tucanae A
Micela, G.; Reale, F.; Benatti, S. +5 more
The discovery of planets around young stars has spurred novel studies of the early phases of planetary formation and evolution. Stars are strong emitters at X-ray and UV wavelengths in their first billion of years and this strongly affects the evaporation, thermodynamics, and chemistry in the atmospheres of the young planets orbiting around them. …
Constraining the CME Core Heating and Energy Budget with SOHO/UVCS
Reeves, Katharine K.; Raymond, John C.; Shen, Chengcai +4 more
We describe the energy budget of a coronal mass ejection (CME) observed on 1999 May 17 with the Ultraviolet Coronagraph Spectrometer (UVCS). We constrain the physical properties of the CME's core material as a function of height along the corona by using the spectra taken by the single-slit coronagraph spectrometer at heliocentric distances of 2.6…
Fluorine Abundances in the Galactic Nuclear Star Cluster
Cunha, Katia; Smith, Verne V.; Daflon, Simone +4 more
Abundances of fluorine (19F), as well as isotopic ratios of 16O/17O, are derived in a sample of luminous young (~107-108 yr) red giants in the Galactic center (with galactocentric distances ranging from 0.6-30 pc), using high-resolution infrared spectra and vibration-rotation lines of H19…
Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. VII. Energy Equipartition
Anderson, Jay; van der Marel, Roeland P.; Alfaro-Cuello, Mayte +3 more
We examine the degree of energy equipartition in nine Galactic globular clusters using proper motions measured with the Hubble Space Telescope. For most clusters in the sample, this is the first energy equipartition study ever performed. This study is also the largest of its kind, albeit with only nine clusters. We begin by rigorously cleaning the…
Shock-accelerated electrons during the fast expansion of a coronal mass ejection
Vainio, R.; Kilpua, E. K. J.; Kumari, A. +2 more
Context. Some of of the most prominent sources for energetic particles in our Solar System are huge eruptions of magnetised plasma from the Sun called coronal mass ejections (CMEs), which usually drive shocks that accelerate charged particles up to relativistic energies. In particular, energetic electron beams can generate radio bursts through the…
The properties of the X-ray corona in the distant (z = 3.91) quasar APM 08279+5255
Cappi, M.; Vignali, C.; Gilli, R. +7 more
We present new joint XMM-Newton and NuSTAR observations of APM 08279+5255, a gravitationally-lensed, broad-absorption line quasar (z = 3.91). After showing a fairly stable flux (f2 − 10 ≃ 4 − 5.5 × 10−13 erg s−1) from 2000 to 2008, APM 08279+5255 was found in a fainter state in the latest X-ray exposures (f2 −…
Identification of three cataclysmic variables detected by the ART-XC and eROSITA telescopes on board the SRG during the all-sky X-ray survey
Sunyaev, R.; Sazonov, S.; Burenin, R. +6 more
We report the discovery of three cataclysmic variables in the data of the first year of the all-sky X-ray survey by the SRG orbital observatory. The sources were selected for their brightness in the 4-12 keV band in the data of the Mikhail Pavlinsky ART-XC telescope. They are also detected by the eROSITA telescope, which provides accurate localiza…
Dual storage and release of molecular oxygen in comet 67P/Churyumov-Gerasimenko
Mousis, Olivier; Trattner, Karlheinz J.; Lunine, Jonathan I. +7 more
One of the biggest surprises of the Rosetta mission was the detection of O2 in the coma of 67P/Churyumov-Gerasimenko in remarkably high abundances. The measured levels of O2 in the coma are generally assumed to reflect the overall abundance and chemical origin of cometary O2 in the nucleus. Along with its strong as…