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Resolving the Vela C ridge with P-ArTéMiS and Herschel
Hill, T.; Rodriguez, L.; André, Ph. +25 more
We present APEX/P-ArTéMiS 450 µm continuum observations of RCW 36 and the adjacent ridge, a high-mass high-column density filamentary structure at the centre of the Vela C molecular cloud. These observations, at higher resolution than Herschel/SPIRE camera, reveal clear fragmentation of the central star-forming ridge. Combined with PACS far-…
Constraining the formation of inner bars: photometry, kinematics and stellar populations in NGC 357
Corsini, E. M.; Aguerri, J. A. L.; Debattista, Victor P. +2 more
Double-barred galaxies are common in the local Universe, with approximately one-third of barred spirals hosting a smaller, inner bar. Nested bars have been proposed as a mechanism to transport gas to the very central regions of the galaxy, trigger star formation and contribute to the growth of the bulge. To test this idea, we perform for the first…
Plasma penetration of the dayside magnetopause
Lundin, R.; Gunell, H.; Dandouras, I. +6 more
Data from the Cluster spacecraft during their magnetopause crossing on 25 January 2002 are presented. The magnetopause was in a state of slow non-oscillatory motion during the observational period. Coherent structures of magnetosheath plasma, here typified as plasmoids, were seen on closed magnetic field lines on the inside of the magnetopause. Us…
The CoRoT B-type binary HD 50230: a prototypical hybrid pulsator with g-mode period and p-mode frequency spacings⋆
Auvergne, M.; Baudin, F.; Poretti, E. +14 more
Context. B-type stars are promising targets for asteroseismic modelling, since their frequency spectrum is relatively simple.
Aims: We deduce and summarise observational constraints for the hybrid pulsator, HD 50230, earlier reported to have deviations from a uniform period spacing of its gravity modes. The combination of spectra and a high-q…
Rotating Wolf-Rayet stars in a post RSG/LBV phase. An evolutionary channel towards long-duration GRBs?
Harries, T. J.; Vink, J. S.; Gräfener, G. +1 more
Context. Wolf-Rayet (WR) stars with fast rotating cores are thought to be the direct progenitors of long-duration gamma-ray bursts (LGRBs). A well accepted evolutionary channel towards LGRBs is chemically-homogeneous evolution at low metallicities, which completely avoids a red supergiant (RSG), or luminous blue variable (LBV) phase. On the other …
Analysis of Cassini magnetic field observations over the poles of Rhea
Dougherty, Michele K.; Saur, Joachim; Kriegel, Hendrik +5 more
We analyze Cassini magnetic field observations from the only two polar flybys of Saturn's largest icy satellite Rhea (R2 on 02 March 2010 and R3 on 11 January 2011) which are scheduled between Saturn Orbit Insertion and the end of the mission in 2017. For the interpretation of these data, we apply estimations from simple analytical models as well …
Initiation and Development of the White-light and Radio Coronal Mass Ejection on 2001 April 15
Pick, M.; Démoulin, P.; Vourlidas, A. +1 more
The 2001 April 15 event was one of the largest of the last solar cycle. A former study established that this event was associated with a coronal mass ejection (CME) observed both at white light and radio frequencies. This radio CME is illuminated by synchrotron emission from relativistic electrons. In this paper, we investigate the relation of the…
The Faint End of the Cluster-galaxy Luminosity Function at High Redshift
Wright, Edward L.; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +7 more
We measure the faint-end slope of the galaxy luminosity function (LF) for cluster galaxies at 1 < z < 1.5 using Spitzer IRAC data. We investigate whether this slope, α, differs from that of the field LF at these redshifts, and with the cluster LF at low redshifts. The latter is of particular interest as low-luminosity galaxies are expected t…
A mid-IR study of the circumstellar environment of Herbig Be stars
Waters, L. B. F. M.; Pantin, E.; van Boekel, R. +7 more
Context. The study of the formation of massive stars is complicated because of the short times scales, large distances, and obscuring natal clouds. There are observational and theoretical indications that the circumstellar environment of Herbig Be (HBe) stars is substantially different from that of their lower mass counterparts, the T Tauri and He…
A Significant Problem with Using the Amati Relation for Cosmological Purposes
Collazzi, Andrew C.; Schaefer, Bradley E.; Goldstein, Adam +1 more
We consider the distribution of many samples of gamma-ray bursts when plotted in a diagram with their bolometric fluence (S bolo) versus the observed photon energy of peak spectral flux (E peak, obs). In this diagram, all bursts that obey the Amati relation (a luminosity relation where the total burst energy has a power-law r…