Search Publications
The Herschel Reference Survey: Dust in Early-type Galaxies and across the Hubble Sequence
Clements, D. L.; Ciesla, L.; Bianchi, S. +24 more
We present Herschel observations of 62 early-type galaxies (ETGs), including 39 galaxies morphologically classified as S0+S0a and 23 galaxies classified as ellipticals using SPIRE at 250, 350, and 500 µm as part of the volume-limited Herschel Reference Survey (HRS). We detect dust emission in 24% of the ellipticals and 62% of the S0s. The me…
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…
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…
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…
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…
Solar Wind Turbulent Spectrum at Plasma Kinetic Scales
Maksimovic, M.; Alexandrova, O.; Mangeney, A. +2 more
The description of the turbulent spectrum of magnetic fluctuations in the solar wind in the kinetic range of scales is not yet completely established. Here, we perform a statistical study of 100 spectra measured by the STAFF instrument on the Cluster mission, which allows us to resolve turbulent fluctuations from ion scales down to a fraction of e…
AKARI Near-infrared Spectroscopic Survey for CO2 in 18 Comets
Nakagawa, Takao; Onaka, Takashi; Usui, Fumihiko +11 more
We conducted a spectroscopic survey of cometary volatiles with the Infrared Camera on board the Japanese infrared satellite AKARI in the wavelength range from 2.5 to 5 µm. In our survey, 18 comets, including both the Oort cloud comets and the Jupiter-family comets, were observed in the period from 2008 June to 2010 January, most of which wer…
Observing the Fine Structure of Loops through High-resolution Spectroscopic Observations of Coronal Rain with the CRISP Instrument at the Swedish Solar Telescope
Rouppe van der Voort, L.; Antolin, P.
Observed in cool chromospheric lines, such as Hα or Ca II H, coronal rain corresponds to cool and dense plasma falling from coronal heights. Considered as a peculiar sporadic phenomenon of active regions, it has not received much attention since its discovery more than 40 years ago. Yet, it has been shown recently that a close relationship exists …