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HIFISTARS Herschel/HIFI observations of VY Canis Majoris. Molecular-line inventory of the envelope around the largest known star
Waters, L. B. F. M.; Menten, K. M.; Olofsson, H. +16 more
Aims: The study of the molecular gas in the circumstellar envelopes of evolved stars is normally undertaken by observing lines of CO (and other species) in the millimetre-wave domain. In general, the excitation requirements of the observed lines are low at these wavelengths, and therefore these observations predominantly probe the cold outer …
Discovery of Nine Intermediate-redshift Compact Quiescent Galaxies in the Sloan Digital Sky Survey
Hwang, Ho Seong; Geller, Margaret J.; Damjanov, Ivana +1 more
We identify nine galaxies with dynamical masses of M dyn >~ 1010 M ⊙ as photometric point sources, but with redshifts between z = 0.2 and z = 0.6, in the Sloan Digital Sky Survey (SDSS) spectro-photometric database. All nine galaxies have archival Hubble Space Telescope images. Surface brightness profile fitting…
Origin of wide-band IP type II bursts
Valtonen, E.; Allawi, H.; Pohjolainen, S.
Context. Different types of interplanetary (IP) type II bursts have been observed, where the more usual ones show narrow-band and patchy emissions, sometimes with harmonics, and which at intervals may disappear completely from the dynamic spectrum. The more unusual bursts are wide-band and diffuse, show no patches or breaks or harmonic emission, a…
Cluster observations near reconnection X lines in Earth's magnetotail current sheet
Fazakerley, A. N.; Gurgiolo, C.; Goldstein, M. L. +2 more
Magnetic reconnection is an efficient way to convert magnetic energy into particle energy. In this paper, we use Cluster thermal electron and ion measurements in the vicinity of a reconnection X line to delineate the structure of the reconnection current sheet. Multispacecraft observations made by Cluster on 18 August 2002 indicate that an X line …
The Debris Disk around γ Doradus Resolved with Herschel
Matthews, Brenda C.; Wilner, David J.; Kavelaars, J. J. +11 more
We present observations of the debris disk around γ Doradus, an F1V star, from the Herschel Key Programme DEBRIS (Disc Emission via Bias-free Reconnaissance in the Infrared/Submillimetre). The disk is well resolved at 70, 100, and 160 µm, resolved along its major axis at 250 µm, detected but not resolved at 350 µm, and confused w…
Optical IFU observations of gas pillars surrounding the super star cluster NGC 3603
Smith, L. J.; Westmoquette, M. S.; Ercolano, B. +1 more
We present optical integral field unit observations of two gas pillars surrounding the Galactic young massive star cluster NGC 3603. The high S/N and spectral resolution of these data have allowed us to accurately quantify the Hα, [N II] and [S II] emission line shapes, and we find a mixture of broad (FWHM ∼ 70-100 km s-1) and narrow (&…
Parallel Electric Field Spectrum of Solar Wind Turbulence
Chen, C. H. K.; Mozer, F. S.
By searching through more than 10 satellite years of THEMIS and Cluster data, 3 reliable examples of parallel electric field turbulence in the undisturbed solar wind have been found. The perpendicular and parallel electric field spectra in these examples have similar shapes and amplitudes, even at large scales (frequencies below the ion gyroscale)…
The behavior of spokes in Saturn's B ring
Porco, C. C.; Spitale, J. N.; Mitchell, C. J. +1 more
We present the first results from Cassini ISS observations aimed at determining both the short-term and long-term behavior of the spokes in Saturn's B ring. We have observed multiple spokes which appear between images where there was not a spoke before. The radial termini of these new spokes expand radially at ∼0.5 km/s in both the inward and outw…
Regular frequency patterns in the young δ Scuti star HD 261711 observed by the CoRoT and MOST satellites
Auvergne, M.; Chaintreuil, S.; Ryabchikova, T. +14 more
Context. The internal structure of pre-main-sequence (PMS) stars is poorly constrained at present. This could change significantly through high-quality asteroseismological observations of a sample of such stars.
Aims: We concentrate on an asteroseismological study of HD 261711, a rather hot δ Scuti-type pulsating member of the young open clus…
Extragalactic number counts at 100 µm, free from cosmic variance
Ivison, R. J.; Roseboom, I. G.; van der Werf, P. P. +4 more
We use data from the Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre (DEBRIS) survey, taken at 100 µm with the Photoconductor Array Camera and Spectrometer instrument on board the Herschel Space Observatory, to make a cosmic variance independent measurement of the extragalactic number counts. These data consist of …