Search Publications
Magnetic Energy Partition between the Coronal Mass Ejection and Flare from AR 11283
Feng, L.; Inhester, B.; Gan, W. Q. +4 more
On 2011 September 6, an X-class flare and a halo coronal mass ejection (CME) were observed from Earth erupting from the same active region AR 11283. The magnetic energy partition between them has been investigated. SDO/HMI vector magnetograms were used to obtain the coronal magnetic field using the nonlinear force-free field (NLFFF) extrapolation …
An Interferometric Spectral Line and Imaging Survey of VY Canis Majoris in the 345 GHz Band
Menten, K. M.; Patel, N. A.; Kamiński, T. +2 more
A spectral line survey of the oxygen-rich red supergiant VY Canis Majoris was made between 279 and 355 GHz with the Submillimeter Array (SMA). Two hundred twenty-three spectral features from 19 molecules (not counting isotopic species of some of them) were observed, including the rotational spectra of TiO, TiO2, and AlCl for the first t…
CoRoT: Harvest of the exoplanet program
Guillot, Tristan; Cabrera, Juan; Deeg, Hans J. +6 more
One of the objectives of the CoRoT mission is the search for transiting extrasolar planets using high-precision photometry, and the accurate characterization of their fundamental parameters. The CoRoT satellite consecutively observes crowded stellar fields since February 2007, in high-cadence precise photometry; periodic eclipses are detected and …
Water Absorption in Galactic Translucent Clouds: Conditions and History of the Gas Derived from Herschel/HIFI PRISMAS Observations
Godard, B.; Lis, D. C.; Phillips, T. G. +8 more
We present Herschel/HIFI observations of the three ground state transitions of H2O (556, 1669, and 1113 GHz) and H218O (547, 1655, and 1101 GHz)—as well as the first few excited transitions of H2O (987, 752, and 1661 GHz)—toward six high-mass star-forming regions, obtained as part of the PRISMAS (PRobing…
The Radial Distribution of Star Formation in Galaxies at z ~ 1 from the 3D-HST Survey
Schmidt, Kasper B.; van Dokkum, Pieter G.; Franx, Marijn +16 more
The assembly of galaxies can be described by the distribution of their star formation as a function of cosmic time. Thanks to the WFC3 grism on the Hubble Space Telescope (HST) it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of Hα emission for a sample of 54 strongly star-forming galaxies at z…
The "Twin-CME" Scenario and Large Solar Energetic Particle Events in Solar Cycle 23
Li, Gang; Zhao, Lulu; Ding, Liuguan +1 more
Energetic particles in large solar energetic particle (SEP) events are a major concern for space weather. Recently, Li et al. proposed a "twin-CME" scenario for ground-level events. Here we extend that study to large SEP events in solar cycle 23. Depending on whether preceding coronal mass ejections (CMEs) within 9 hr exist and whether ions >10…
X-Ray Selected AGN Host Galaxies are Similar to Inactive Galaxies out to z = 3: Results from CANDELS/CDF-S
Wuyts, S.; Giavalisco, M.; Dunlop, J. S. +18 more
We use multi-band spatially resolved photometry from the Cosmic Assembly Near-IR Deep Legacy Survey in the 4 Ms Chandra Deep Field-South to explore the nuclear and extended colors, color gradients, and stellar populations of the host galaxies of X-ray selected active galactic nuclei (AGNs) out to z = 3. Based on a study of their central light, we …
Water in star-forming regions with Herschel (WISH). IV. A survey of low-J H2O line profiles toward high-mass protostars
Liseau, R.; van Dishoeck, E. F.; Bergin, E. A. +12 more
Context. Water is a key constituent of star-forming matter, but the origin of its line emission and absorption during high-mass star formation is not well understood.
Aims: We study the velocity profiles of low-excitation H2O lines toward 19 high-mass star-forming regions and search for trends with luminosity, mass, and evolutionar…
Inner Heliospheric Evolution of a "Stealth" CME Derived from Multi-view Imaging and Multipoint in Situ observations. I. Propagation to 1 AU
Jian, L. K.; Szabo, A.; Nieves-Chinchilla, T. +4 more
Coronal mass ejections (CMEs) are the main driver of space weather. Therefore, a precise forecasting of their likely geo-effectiveness relies on an accurate tracking of their morphological and kinematical evolution throughout the interplanetary medium. However, single viewpoint observations require many assumptions to model the development of the …
Revisiting cometary bow shock positions
Glassmeier, K. -H.; Richter, I.; Rubin, M. +2 more
The Rosetta spacecraft will arrive at comet 67P/Churyumov-Gerasimenko in 2014 and will escort the comet along its journey around the Sun. The predicted outgassing rate of the comet and the solar wind properties close to its perihelion at 1.24 AU lead to the expectation that a cometary bow shock will form during the escort phase. Since the forecast…