Search Publications
A Detailed Study of Gas and Star Formation in a Highly Magnified Lyman Break Galaxy at z = 3.07
Kneib, J. -P.; Smail, Ian; Dye, S. +10 more
We report the detection of CO(3-2) emission from a bright, gravitationally lensed Lyman Break galaxy, LBG J213512.73-010143 (the ``Cosmic Eye''), at z=3.07, using the Plateau de Bure Interferometer. This is only the second detection of molecular gas emission from an LBG and yields an intrinsic molecular gas mass of (2.4+/-0.4)×109 M
Evidence of Superdiffusive Transport of Electrons Accelerated at Interplanetary Shocks
Perri, S.; Zimbardo, G.
We study the transport properties of energetic electrons accelerated at corotating interaction regions in the solar wind considering the possibility of anomalous diffusion. It is shown that the particle time decay has a power-law behavior when a non-Gaussian propagator, appropriate for superdiffusive transport, is assumed for particles accelerated…
The Post-Burst Awakening of the Anomalous X-Ray Pulsar in Westerlund 1
Campana, S.; Stella, L.; Israel, G. L. +4 more
On 2006 September 21, an intense (~1039 erg s-1) and short (20 ms) burst was detected by Swift BAT at a position consistent with that of the candidate anomalous X-ray pulsar (AXP) CXOU J164710.2-455216, discovered by Chandra in 2005. Swift follow-up observations began ~13 hr after the event and found the source at a 1-10 keV …
Mass Outflow from the Nucleus of the Seyfert 1 Galaxy NGC 4151
Kraemer, S. B.; Crenshaw, D. M.
We present an analysis of UV and optical spectra of NGC 4151 obtained at high spectral and angular resolutions with the Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS). We identify a kinematic component of the emission lines that has a width of 1170 km s-1 (FWHM), intermediate between those from the broad and narr…
Significance of Dungey-cycle flows in Jupiter's and Saturn's magnetospheres, and their identification on closed equatorial field lines
Badman, S. V.; Cowley, S. W. H.
We consider the contribution of the solar wind-driven Dungey-cycle to flux transport in Jupiter's and Saturn's magnetospheres, the associated voltages being based on estimates of the magnetopause reconnection rates recently derived from observations of the interplanetary medium in the vicinity of the corresponding planetary orbits. At Jupiter, the…
η Carinae across the 2003.5 Minimum: Spectroscopic Evidence for Massive Binary Interactions
Gull, T. R.; Nielsen, K. E.; Corcoran, M. F. +4 more
We have analyzed high spatial, moderate spectral resolution observations of η Carinae (η Car) obtained with the STIS from 1998.0 to 2004.3. The data were obtained at discrete times covering an entire 2024 day spectroscopic cycle, with focus on the X-ray/ionization low state that began in 2003 June. The spectra show prominent P Cygni lines in H I, …
X-ray monitoring of optical novae in M 31 from July 2004 to February 2005
Stiele, H.; Pietsch, W.; Haberl, F. +9 more
Context: Optical novae have recently been identified as the major class of supersoft X-ray sources in M 31 based on ROSAT and early XMM-Newton and Chandra observations.
Aims: This paper reports on a search for X-ray counterparts of optical novae in M 31 based on archival Chandra HRC-I and ACIS-I as well as XMM-Newton observations of the galaxy…
Dynamics of thin current sheets: Cluster observations
Sauvaud, J. -A.; Vaivads, A.; Le Contel, O. +9 more
The paper tries to sort out the specific signatures of the Near Earth Neutral Line (NENL) and the Current Disruption (CD) models, and looks for these signatures in Cluster data from two events. For both events transient magnetic signatures are observed, together with fast ion flows. In the simplest form of NENL scenario, with a large-scale two-dim…
Multiple protostellar systems. II. A high resolution near-infrared imaging survey in nearby star-forming regions
Duchêne, G.; Ghez, A. M.; Bontemps, S. +3 more
Context: Multiple systems are the product of protostellar core fragmentation. Studying their statistical properties in young stellar populations therefore probes the physical processes at play during star formation.
Aims: Our project endeavors to obtain a robust view of multiplicity among embedded Class I and Flat Spectrum protostars in a wide…
Discovery of Extreme Asymmetry in the Debris Disk Surrounding HD 15115
Kalas, Paul; Fitzgerald, Michael P.; Graham, James R.
We report the first scattered light detection of a dusty debris disk surrounding the F2 V star HD 15115 using the Hubble Space Telescope in the optical and Keck adaptive optics in the near-infrared. The most remarkable property of the HD 15115 disk relative to other debris disks is its extreme length asymmetry. The east side of the disk is detecte…