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Signs of magnetic helicity in interplanetary coronal mass ejections and associated prominences: Case study
Hu, Qiang; Ruzmaikin, Alexander; Martin, Sara
We study the distribution of magnetic helicity in interplanetary coronal mass ejections (CMEs) separated into magnetic clouds and remnants of the prominence structures for three cases with identified remnants of prominences. The magnetic configurations of magnetic clouds and prominence remnants can satisfactorily be described by the flux rope appr…
The Earth's quasi-parallel bow shock: Review of observations and perspectives for Cluster
Wilkinson, William P.
Spacecraft crossings of the Earth's quasi-parallel bow shock under typical high Mach number conditions are characterized by the presence of large-amplitude, compressive, low-frequency magnetic pulsations. Thus, instead of the fairly abrupt jump from upstream to downstream states one associates with their quasi-perpendicular counterparts, quasi-par…
Properties of fast magnetosonic shocklets at the bow shock
Lavraud, B.; Buchert, S.; Stasiewicz, K. +3 more
We present detailed properties of fast magnetosonic shocklets (1000 km in size and amplitude of 10 times the background B-field values) observed in natural unbounded collisionless plasma by a fleet of four Cluster spacecraft at the quasi-parallel bow shock. We provide for the first time details of the internal structure of shocklets which have mag…
An HST morphological survey of faint extremely red objects
Ivison, R. J.; Smail, Ian; Packham, C. +1 more
We present the results from a survey for extremely red objects (EROs) in deep, high-resolution optical images taken from the Hubble Space Telescope (HST) Medium Deep Survey. We have surveyed 35 deep F814W HST/WFPC2 fields in the near-infrared to a typical depth of K>~ 20. From a total area of 206 arcmin2 and to a limit of K= 20.0, we…
XMM-Newton observations of Nova LMC 2000
Greiner, J.; Schartel, N.; Orio, M.
We report on three X-ray observations of Nova LMC 2000 with XMM-Newton at 17, 51 and 294 days after the maximum, respectively. X-ray spectral fits show a concordant decrease of the absorbing column and the X-ray luminosity. No supersoft X-ray emission is detected. The mass of the ejected shell is determined to be (less than) 7.5 x 10-5 …
Oxygen Abundance in the Template Halo Giant HD 122563
Damineli, Augusto; Hill, Vanessa; Meléndez, Jorge +7 more
HD 122563 is a well-known bright (V=6.2) halo giant of low metallicity ([Fe/H]~-2.7). We have observed HD 122563 for infrared OH lines at 1.5-1.7 µm in the H band with the NIRSPEC high-resolution spectrograph at the 10 m Keck Telescope. Optical spectra were obtained with the UVES spectrograph at the 8 m VLT UT2 telescope at ESO (Paranal) and…
XMM-Newton study of the persistent X-ray source 1E 1743.1-2843 located in the Galactic Center direction
Goldoni, P.; Rodriguez, J.; Decourchelle, A. +4 more
We report the results of an XMM-Newton observation of the persistent X-ray source
EPIC simulations of the merger of Jupiter's White Ovals BE and FA: altitude-dependent behavior
Dowling, Timothy E.; Sánchez-Lavega, Agustín.; Morales-Juberías, Raúl
Observations of the merger of Jupiter's White Ovals BE and FA show altitude-dependent behavior that we seek to capture in numerical simulations. In particular, it was observed that the upper portions of the vortices orbited each other before merging, but the lower portions translated into each other without orbiting, a phenomenon we term the pair-…
The Globular Cluster System of the Spiral Galaxy NGC 7814
Zepf, Stephen E.; Rhode, Katherine L.
We present the results of a wide-field photometric study of the globular cluster (GC) system of the edge-on Sab spiral NGC 7814. This is the first spiral to be fully analyzed from our survey of the GC systems of a large sample of galaxies beyond the Local Group. NGC 7814 is of particular interest because a previous study estimated that it has 500-…
X-Ray Rotational Modulation in VXR45
Micela, G.; Peres, G.; Sciortino, S. +1 more
We present evidence of X-ray rotational modulation on VXR45, a young very fast rotator star member of IC2391 open cluster, observed with XMM-Newton observatory.