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Magnetic Field Structures Triggering Solar Flares and Coronal Mass Ejections
Kusano, K.; Yamamoto, T. T.; Iida, Y. +3 more
Solar flares and coronal mass ejections, the most catastrophic eruptions in our solar system, have been known to affect terrestrial environments and infrastructure. However, because their triggering mechanism is still not sufficiently understood, our capacity to predict the occurrence of solar eruptions and to forecast space weather is substantial…
A Systematic Survey of High-temperature Emission in Solar Active Regions
Winebarger, Amy R.; Warren, Harry P.; Brooks, David H.
The recent analysis of observations taken with the EUV Imaging Spectrometer and X-Ray Telescope instruments on Hinode suggests that well-constrained measurements of the temperature distribution in solar active regions can finally be made. Such measurements are critical for constraining theories of coronal heating. Past analysis, however, has suffe…
GOODS-Herschel: dust attenuation properties of UV selected high redshift galaxies
Elbaz, D.; Dickinson, M.; Pannella, M. +9 more
Context. Dust attenuation in galaxies is poorly known, especially at high redshift. And yet the amount of dust attenuation is a key parameter to deduce accurate star formation rates from ultraviolet (UV) rest-frame measurements. The wavelength dependence of the dust attenuation is also of fundamental importance to interpret the observed spectral e…
The Direct Detection of Cool, Metal-enriched Gas Accretion onto Galaxies at z ~ 0.5
Prochaska, J. Xavier; Koo, David C.; Rubin, Kate H. R. +1 more
We report on the discovery of cool gas inflow toward six star-forming galaxies with redshifts z ~ 0.35-1. Analysis of Mg II and Fe II resonance-line absorption in Keck/LRIS spectroscopy of the galaxies reveals positive velocity shifts for cool gas of 80-200 km s-1 with respect to the host galaxy velocity centroids, and equivalent widths…
The BOSS Emission-Line Lens Survey (BELLS). I. A Large Spectroscopically Selected Sample of Lens Galaxies at Redshift ~0.5
Brownstein, Joel R.; Schlegel, David J.; Schneider, Donald P. +11 more
We present a catalog of 25 definite and 11 probable strong galaxy-galaxy gravitational lens systems with lens redshifts 0.4 <~ z <~ 0.7, discovered spectroscopically by the presence of higher-redshift emission lines within the Baryon Oscillation Spectroscopic Survey (BOSS) of luminous galaxies, and confirmed with high-resolution Hubble Space…
GALAPAGOS: from pixels to parameters
Barden, Marco; Peng, Chien Y.; McIntosh, Daniel H. +2 more
To automate source detection, two-dimensional light profile Sérsic modelling and catalogue compilation in large survey applications, we introduce a new code Galaxy Analysis over Large Areas: Parameter Assessment by GALFITting Objects from SEXTRACTOR (GALAPAGOS). Based on a single set-up, GALAPAGOS can process a complete set of survey images. It de…
The Structure and Emission Model of the Relativistic Jet in the Quasar 3C 279 Inferred from Radio to High-energy γ-Ray Observations in 2008-2010
Sakamoto, T.; Greiner, J.; Lähteenmäki, A. +90 more
We present time-resolved broadband observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space Telescope mission. While investigating the previously reported γ-ray/optical flare accompanied by a change in optical polarization, we found that the optical emission appear…
Star-formation laws in luminous infrared galaxies. New observational constraints on models
Colina, L.; Planesas, P.; Arribas, S. +5 more
Context. The observational study of star-formation relations in galaxies is central for unraveling the related physical processes that are at work on local and global scales. It is still debated whether star formation can be described by a universal law that remains valid in different populations of galaxies.
Aims: We aim to expand the sample…
The Longitudinal Properties of a Solar Energetic Particle Event Investigated Using Modern Solar Imaging
Cohen, C. M. S.; Mewaldt, R. A.; Mason, G. M. +10 more
We use combined high-cadence, high-resolution, and multi-point imaging by the Solar-Terrestrial Relations Observatory (STEREO) and the Solar and Heliospheric Observatory to investigate the hour-long eruption of a fast and wide coronal mass ejection (CME) on 2011 March 21 when the twin STEREO spacecraft were located beyond the solar limbs. We analy…
Collisional Excitation of the [C II] Fine Structure Transition in Interstellar Clouds
Velusamy, T.; Goldsmith, Paul F.; Pineda, Jorge L. +1 more
We analyze the collisional excitation of the 158 µm (1900.5 GHz) fine structure transition of ionized carbon in terms of line intensities produced by simple cloud models. The single C+ fine structure transition is a very important coolant of the atomic interstellar medium (ISM) and of photon-dominated regions in which carbon is pa…