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Planetary period oscillations in Saturn's magnetosphere: Evolution of magnetic oscillation properties from southern summer to post-equinox
Dougherty, M. K.; Lamy, L.; Andrews, D. J. +3 more
We investigate the evolution of the properties of planetary period magnetic field oscillations observed by the Cassini spacecraft in Saturn's magnetosphere over the interval from late 2004 to early 2011, spanning equinox in mid-2009. Oscillations within the inner quasi-dipolar region (L ≤ 12) consist of two components of close but distinct periods…
Solar Coronal Loops Resolved by Hinode and the Solar Dynamics Observatory
Warren, Harry P.; Ugarte-Urra, Ignacio; Brooks, David H.
Despite decades of studying the Sun, the coronal heating problem remains unsolved. One fundamental issue is that we do not know the spatial scale of the coronal heating mechanism. At a spatial resolution of 1000 km or more, it is likely that most observations represent superpositions of multiple unresolved structures. In this Letter, we use a comb…
The SL2S Galaxy-scale Gravitational Lens Sample. I. The Alignment of Mass and Light in Massive Early-type Galaxies at z = 0.2-0.9
Treu, Tommaso; Gavazzi, Raphaël; Marshall, Philip J. +2 more
We study the relative alignment of mass and light in a sample of 16 massive early-type galaxies at z = 0.2-0.9 that act as strong gravitational lenses. The sample was identified from deep multi-band images obtained as part of the Canada-France-Hawaii Telescope Legacy Survey and as part of the Strong Lensing Legacy Survey (SL2S). Higher resolution …
The Relation between Cool Cluster Cores and Herschel-detected Star Formation in Brightest Cluster Galaxies
Smith, G. P.; Altieri, B.; Valtchanov, I. +12 more
We present far-infrared (FIR) analysis of 68 brightest cluster galaxies (BCGs) at 0.08 < z < 1.0. Deriving total infrared luminosities directly from Spitzer and Herschel photometry spanning the peak of the dust component (24-500 µm), we calculate the obscured star formation rate (SFR). 22+6.2 -5.3% of the BCGs are…
Supergranules as Probes of the Sun's Meridional Circulation
Hathaway, David H.
Recent analysis revealed that supergranules (convection cells seen at the Sun's surface) are advected by the zonal flows at depths equal to the widths of the cells themselves. Here we probe the structure of the meridional circulation by cross-correlating maps of the Doppler velocity signal using a series of successively longer time lags between ma…
Dust in historical Galactic Type Ia supernova remnants with Herschel
Ivison, R. J.; Henning, Th.; Krause, O. +13 more
The origin of interstellar dust in galaxies is poorly understood, particularly the relative contributions from supernovae and the cool stellar winds of low-intermediate-mass stars. Recently, large masses of newly formed dust have been discovered in the ejecta of core-collapse supernovae. Here, we present Herschel Photodetector Array Camera and Spe…
Resolved Near-infrared Stellar Populations in Nearby Galaxies
de Jong, Roelof S.; Williams, Benjamin F.; Boyer, Martha L. +10 more
We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the resolved stellar populations within 26 fields of 23 nearby galaxies (lsim 4 Mpc), based on images in the F110W and F160W filters taken with the Wide-Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). The CMDs are measured in regions spanning a wide range of star formati…
On the Nature of the Solar Wind from Coronal Pseudostreamers
Sheeley, N. R., Jr.; Wang, Y. -M.; Robbrecht, E. +1 more
Coronal pseudostreamers, which separate like-polarity coronal holes, do not have current sheet extensions, unlike the familiar helmet streamers that separate opposite-polarity holes. Both types of streamers taper into narrow plasma sheets that are maintained by continual interchange reconnection with the adjacent open magnetic field lines. White-l…
The double sub-giant branch of NGC 6656 (M 22): a chemical characterization
Milone, A. P.; Marino, A. F.; Zoccali, M. +14 more
We present an abundance analysis of 101 subgiant branch (SGB) stars in the globular cluster M 22. Using low-resolution FLAMES/GIRAFFE spectra we have determined abundances of the neutron-capture strontium and barium and the light element carbon. With these data we explore relationships between the observed SGB photometric split in this cluster and…
Submillimeter Line Spectrum of the Seyfert Galaxy NGC 1068 from the Herschel-SPIRE Fourier Transform Spectrometer
Wilson, Christine D.; Bendo, George J.; Madden, Suzanne C. +13 more
The first complete submillimeter spectrum (190-670 µm) of the Seyfert 2 galaxy NGC 1068 has been observed with the SPIRE Fourier transform spectrometer on board the Herschel Space Observatory. The sequence of CO lines (J up = 4-13), lines from H2O, the fundamental rotational transition of hydrogen fluoride, two o-H…