Search Publications
The DEEP Groth Strip Survey. I. The Sample
Weiner, Benjamin J.; Illingworth, Garth D.; Rhodes, Jason +18 more
The Deep Extragalactic Exploratory Probe (DEEP) is a multiphase research program dedicated to the study of the formation and evolution of galaxies and of large-scale structure in the distant universe. This paper describes the first five-year phase, denoted DEEP1. A series of 10 DEEP1 papers will discuss a range of scientific topics (e.g., the stud…
Erosion by flowing Martian lava: New insights for Hecates Tholus from Mars Express and MER data
Greeley, Ronald; Williams, David A.; Neukum, Gerhard +2 more
We have used new compositional information on Martian basaltic rocks from the Mars Exploration Rover Spirit and data from new stereo imaging by the High Resolution Stereo Camera (HRSC) on the Mars Express orbiter to constrain an existing analytical-numerical computer model to assess the potential of Martian lavas to form lava channels by erosion o…
Automated Boundary-extraction And Region-growing Techniques Applied To Solar Magnetograms
Gallagher, Peter T.; McAteer, R. T. James; Ireland, Jack +1 more
We present an automated approach to active region extraction from full-disc MDI longitudinal magnetograms. This uses a region-growing technique in conjunction with boundary-extraction to define a number of enclosed contours as belonging to separate regions of magnetic significance on the solar disc. This provides an objective definition of active …
A Possible Third Component in the L Dwarf Binary System DENIS-P J020529.0-115925 Discovered with the Hubble Space Telescope
Martín, E. L.; Bouy, H.; Bouvier, J. +1 more
We present results showing that the multiple system DENIS-P J020529.0-115925 is likely to be a triple system of very low mass stars and brown dwarfs. The secondary of this previously known binary system shows a clear elongation on six images obtained at six different epochs. Significant residuals remain after point-spread function (PSF) subtractio…
MHD simulation of the formation and propagation of multiple magnetic clouds in the heliosphere
Wang, S.; Wang, Y.; Zheng, H. +1 more
A multiple-magnetic-cloud (Multi-MC) structure formed by the overtaking of two successive coronal mass ejections (CMEs) in the heliosphere is studied by using a 2.5-D MHD simulation. This simulation illustrates the process of the formation and propagation of two identical CMEs, which are ejected with speeds of 400 km s-1 and 600 km s
Possible AGN Shock Heating in the Cool-Core Galaxy Cluster Abell 478
Finoguenov, Alexis; Mohr, Joseph J.; Sanderson, Alastair J. R.
We present a detailed X-ray study of the intracluster medium (ICM) of the nearby cool-core galaxy cluster Abell 478 (z=0.088), based on Chandra and XMM-Newton observations. Using a wavelet-smoothing hardness analysis, we derive detailed temperature maps of A478, revealing a surprising amount of temperature structure for an apparently well-relaxed …
Dawn-dusk asymmetries and sub-Alfvénic flow in the high and low latitude magnetosheath
Dandouras, I.; Fazakerley, A. N.; Lucek, E. A. +4 more
We present the results of a statistical survey of the magnetosheath using four years of Cluster orbital coverage. Moments of the plasma distribution obtained from the electron and ion instruments together with magnetic field data are used to characterise the flow and density in the magnetosheath. We note two important differences between our surve…
The distance to the Pleiades. Main sequence fitting in the near infrared
Salaris, M.; Groenewegen, M. A. T.; Percival, S. M.
Hipparcos parallax measurements of stars in the Pleiades notoriously result in a cluster distance of 118 pc, which is approximately 10% shorter than the ``classical'' result obtained from earlier main sequence (MS) fitting studies. In an earlier paper we developed a purely empirical MS-fitting method in an attempt to address this problem. This wor…
Introduction to the special section: Violent Sun-Earth connection events of October-November 2003
Plunkett, S. P.; Lu, G.; Gopalswamy, N. +2 more
During 2003 October and November, a series of solar eruptions occurred from three solar active regions. Some of these eruptions were extreme in terms of their origin (source properties) and heliospheric consequences. This paper summarizes the first results of the analysis of these violent Sun-Earth connection events.
An Unusual Spectral State of an Ultraluminous Very Soft X-Ray Source during Outburst
Kong, A. K. H.; Di Stefano, R.
We report the results of Chandra and XMM-Newton observations of a new outburst of an ultraluminous X-ray source in M101. During a Chandra monitoring observation of M101, M101 ULX-1 was found to be in outburst in 2004 December, the second outburst in 2004. The peak bolometric luminosity is about 3×1040 ergs s-1 (7×1039