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Bimodal Galaxies and Bimodality in Globular Cluster Systems
Forbes, Duncan A.
Various galaxy properties are not continuous over a large range in mass but rather reveal a remarkable transition or ``bimodality'' at a stellar mass of 3×1010 Msolar. These properties include colors, stellar populations, X-ray emission, and mass-to-light ratios. This behavior has been interpreted as the transition from hot t…
Prominence atlas in the SUMER range 800-1250 Å. II. Line profile properties and ions identifications
Vial, J. -C.; Parenti, S.; Lemaire, P.
We present a SOHO/SUMER spectral atlas in the 800-1250 Å range of a prominence and a Quiet Sun (QS) region observed in 1999. The atlas is produced for two separate areas of the prominence. The QS spectrum is used as a reference. This is the first prominence atlas obtained with high spectral resolution (≈0.044 Å). It provides information concerning…
The lens and source of the optical Einstein ring gravitational lens ER 0047-2808
Lewis, Geraint F.; Warren, Stephen J.; Hewett, Paul C. +1 more
We perform a detailed analysis of the optical gravitational lens ER 0047-2808 imaged with the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Using software specifically designed for the analysis of resolved gravitational lens systems, we focus on how the image alone can constrain the mass distribution in the lens galaxy. We find that…
The global plasma environment of Titan as observed by Cassini Plasma Spectrometer during the first two close encounters with Titan
Coates, A. J.; Crary, F.; Johnson, R. E. +17 more
The Cassini spacecraft flew by Titan on October 26, 2004 and December 13, 2004. In both cases it entered the ionosphere of Titan, allowing exploration of its plasma environment. Using observations from the Cassini Plasma Spectrometer (CAPS) and the Cassini magnetometer along the inbound legs of both flybys, we examine Titan's global plasma environ…
Interplanetary conditions and magnetospheric dynamics during the Cassini orbit insertion fly-through of Saturn's magnetosphere
Jackman, C. M.; Kurth, W. S.; Cecconi, B. +5 more
The primary purpose of this paper is to discuss the interplanetary conditions that prevailed during the Saturn orbit insertion (SOI) fly-through of Saturn's magnetosphere by the Cassini spacecraft in June-July 2004 and the consequent magnetospheric dynamics. We begin by examining concurrent interplanetary magnetic field (IMF) and Saturn kilometric…
Dynamics of solar active regions. II. Oscillations observed with MDI and their relation to the magnetic field topology
Muglach, K.; Staude, J.; Hofmann, A.
We present new results of an international joint observing campaign, which was carried out in September 2000 to study the oscillatory behaviour of solar active regions. We concentrate on oscillations in the lower layers of the solar atmosphere as observed with the Michelson Doppler Imager (MDI, Scherrer et al. 1995, Sol. Phys., 162, 129). The resu…
An XMM-Newton and Chandra study of the starburst galaxy IC 10
Whitaker, Katherine E.; Wang, Q. Daniel; Williams, Rosa
We present an X-ray study of our nearest starburst galaxy IC 10, based on XMM-Newton and Chandra observations. A list of 73 XMM-Newton and 28 Chandra detections of point-like X-ray sources in the field is provided; a substantial fraction of them are likely stellar objects in the Milky Way due to the low Galactic latitude location of IC 10. The bri…
Pulse-Phase Spectroscopy of SMC X-1 with Chandra and XMM-Newton: Reprocessing by a Precessing Disk?
Hickox, R. C.; Vrtilek, S. D.
We present pulse-phase X-ray spectroscopy of the high-mass X-ray pulsar SMC X-1 from five different epochs, using Chandra X-Ray Observatory ACIS-S and XMM-Newton EPIC pn data. The X-ray spectrum consistently shows two distinct components, a hard power law and a soft blackbody with kTBB~0.18 keV. For all five epochs the hard component sh…
On the generation of enhanced sunward convection and transpolar aurora in the high-latitude ionosphere by magnetic merging
Balogh, A.; RèMe, H.; Dunlop, M. W. +11 more
The IMAGE Wideband Imaging Camera (WIC) instrument observed the duskside development of an oval-aligned transpolar auroral arc (TPA) in the Northern Hemisphere (NH) on 16 December 2001 during strong IMF ∣B∣ ∼ 18 nT and a generally steady ∼56° clock angle (positive IMF By and Bz). Observational evidence suggests that the daysi…
An XMM-Newton observation of A3921: An off-axis merger
Pratt, G. W.; Bourdin, H.; Sauvageot, J. -L. +1 more
We present the results of a detailed analysis of the XMM-Newton observation of the galaxy cluster Abell 3921. The X-ray morphology of the cluster is elliptical, with the centroid offset from the brightest cluster galaxy by 17 arcsec, and with a pronounced extension toward the NW. Subtraction of a 2D β-model fit to the main cluster emission reveals…