Search Publications
Measuring the Magnetic-Field Strength of the Quiet Solar Corona Using "EIT Waves"
Long, D. M.; Régnier, S.; Harra, L. K. +1 more
Variations in the propagation of globally propagating disturbances (commonly called "EIT waves") through the low solar corona offer a unique opportunity to probe the plasma parameters of the solar atmosphere. Here, high-cadence observations of two "EIT wave" events taken using the Atmospheric Imaging Assembly (AIA) instrument onboard the Solar Dyn…
A CHARA Array Survey of Circumstellar Disks around Nearby Be-type Stars
Gies, D. R.; Goldfinger, P. J.; McAlister, H. A. +11 more
We report on a high angular resolution survey of circumstellar disks around 24 northern sky Be stars. The K-band continuum survey was made using the CHARA Array long baseline interferometer (baselines of 30-331 m). The interferometric visibilities were corrected for the flux contribution of stellar companions in those cases where the Be star is a …
Two rings but no fellowship: LoTr 1 and its relation to planetary nebulae possessing barium central stars
Boumis, P.; Pollacco, D.; Santander-García, M. +8 more
LoTr 1 is a planetary nebula thought to contain an intermediate-period binary central star system (that is, a system with an orbital period, P, between 100 and, say, 1500 d). The system shows the signature of a K type, rapidly rotating giant and most likely constitutes an accretion-induced post-mass-transfer system similar to other PNe, such as Lo…
Evolution of the Io footprint brightness I: Far-UV observations
Saur, J.; Bonfond, B.; Clarke, J. T. +6 more
The Io footprint (IFP) is a set of auroral spots and an extended tail resulting from the strong interaction between Io and the Jovian magnetosphere. For the first time, we present measurements of the brightness and precipitated power for each individual spot, using the image database gathered from 1997 to 2009 with the Hubble Space Telescope in th…
Towards understanding the relation between the gas and the attenuation in galaxies at kpc scales
Ciesla, L.; Buat, V.; Boquien, M. +13 more
Context. Understanding the relation between the attenuation and the gas is fundamental for interpreting the appearance of galaxies. This can now be done down to a local scale in the local Universe, thanks to the high spatial resolution achievable from the far-ultraviolet (FUV) to the far-infrared (FIR). More importantly, this relation is also cruc…
Herschel-SPIRE Fourier transform spectroscopy of the nearby spiral galaxy IC 342
Magdis, G. E.; Rigopoulou, D.; Pellegrini, E. +9 more
We present observations of the nearby spiral galaxy IC 342 with the Herschel Spectral and Photometric Imaging Receiver (SPIRE) Fourier transform spectrometer. The spectral range afforded by SPIRE, 196-671 µm, allows us to access a number of 12CO lines from J = 4-3 to J = 13-12 with the highest J transitions observed for the first …
Molecular gas mass functions of normal star-forming galaxies since z ~ 3
Berta, S.; Magnelli, B.; Nordon, R. +7 more
We used deep far-infrared data from the PEP/GOODS-Herschel surveys and restframe ultraviolet photometry to study the evolution of the molecular gas mass function of normal star-forming galaxies. Computing the molecular gas mass, Mmol, by scaling star formation rates through depletion timescales, or combining infrared (IR) luminosity and…
Complex Diffuse Radio Emission in the Merging Planck ESZ Cluster A3411
van Weeren, R. J.; Forman, W. R.; Murray, S. S. +7 more
We present Very Large Array (VLA) radio and Chandra X-ray observations of the merging galaxy cluster A3411. For the cluster, we find an overall temperature of 6.4^{+0.6}_{-1.0} keV and an X-ray luminosity of 2.8 ± 0.1 × 1044 erg s-1 between 0.5 and 2.0 keV. The Chandra observation reveals the cluster to be undergoing a merger…
The location of the Earth's magnetopause: A comparison of modeled position and in situ Cluster data
Wild, J. A.; Case, N. A.
Exploiting 8years of magnetic field data from the Cluster mission, we employ an automated magnetopause crossing detection routine to determine the magnetopause location over varying magnetic latitudes and local times. For a period spanning nearly one solar cycle we build a database of 2709 magnetopause crossings and compare these locations to the …
Saturn’s visible lightning, its radio emissions, and the structure of the 2009-2011 lightning storms
Porco, Carolyn C.; Dyudina, Ulyana A.; Ingersoll, Andrew P. +3 more
Visible lightning on Saturn was first detected by the Cassini camera in 2009 at ∼35° South latitude. We report more lightning observations at ∼35° South later in 2009, and lightning in the 2010-2011 giant lightning storm at ∼35° North. The 2009 lightning is detected on the night side of Saturn in a broadband clear filter. The 2011 lightning is det…