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Plasma flow channels with ULF waves observed by Cluster and Double Star
Balogh, A.; Zhang, T. L.; Glassmeier, K. -H. +9 more
On 14 August 2004 a large-scale magnetic structure was observed by Double Star TC-1 in the southern lobe and by Cluster in the northern lobe of the magnetotail. The structure has the signature of a (localized) dipolarization, decreasing Bx accompanied by an increasing Bz and a strong earthward flow. The propagation direction …
Late-Time X-Ray, UV, and Optical Monitoring of Supernova 1979C
Van Dyk, Schuyler D.; Petre, Robert; Rudie, Gwen C. +8 more
We present results from observations of supernova (SN) 1979C with the Newton X-Ray Multi-Mirror (XMM-Newton) mission in X-rays and in UV, archival X-ray, and Hubble Space Telescope (HST) data, and follow-up ground-based optical imaging. The XMM-Newton MOS spectrum shows the best-fit two-temperature thermal plasma emission characteristics of both t…
Unobscured QSO 2: a new class of objects?
Wolter, A.; Henry, J. P.; Gioia, I. M. +1 more
We present in this paper optical and X-ray follow up observations for three X-ray selected objects extracted from the ROSAT North Ecliptic Pole survey which is a flux-limited, completely identified survey. All three objects have X-ray luminosities in the 1044 erg s-1 regime and show narrow emission lines in their optical disc…
The Intrinsic Properties of SMM J14011+0252
Smith, G. P.; Ivison, R. J.; Smail, Ian
We discuss the properties of the bright submillimeter source SMM J14011+0252 at z=2.56, which lies behind the central regions of the z=0.25 lensing cluster A1835. This system has a complex optical morphology consisting of at least five separate components. We reassess the extensive multiwavelength observations of this system and find strong suppor…
The X-ray source population of the globular cluster M15: Chandra high-resolution imaging
Charles, P. A.; Davies, M. B.; Naylor, T. +5 more
The globular cluster M15 was observed on three occasions with the High Resolution Camera on-board Chandra in 2001 in order to investigate the X-ray source population in the cluster centre. After subtraction of the two bright central sources, four faint sources were identified within 50 arcsec of the core. One of these sources is probably the plane…
The transport of galactic and jovian cosmic ray electrons in the heliosphere
Ferreira, S. E. S.
An overview is given on what we know about the cosmic ray diffusion process from the modelling of low-energy (MeV) electron transport in the heliosphere. For energies below ∼300 MeV, these electrons give a direct indication of the average mean free paths because they do not experience large adiabatic energy changes and their modulation is largely …
The FUSE Spectrum of the Planetary Nebula SwSt 1: Evidence for Inhomogeneities in the Gas and Dust
Redfield, Seth; Dinerstein, Harriet L.; Bowers, C. W. +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the young, compact planetary nebula (PN) SwSt 1 along the line of sight to its central star HD 167362. We detect circumstellar absorption lines from several species against the continuum of the central star. The physical parameters of the nebula derived from the FUSE data dif…
Faint BVRI Photometric Sequences in Selected Fields
Saha, A.; Dolphin, A. E.; Thim, F. +1 more
The results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V~21 mag in compact fields is presented. Such calibration and extension of sequences is necessary to fill a calibration gap if reliable photometry from modest aperture telescopes in space (e.g., the Hubble Space Telescope) or terrestrial …
Cool Customers in the Stellar Graveyard. I. Limits to Extrasolar Planets Around the White Dwarf G29-38
Debes, John H.; Woodgate, Bruce E.; Sigurdsson, Steinn
We present high-contrast images of the hydrogen white dwarf G29-38 taken in the near-infrared with the Hubble Space Telescope and the Gemini North Telescope as part of a high-contrast imaging search for substellar objects in orbit around nearby white dwarfs. We review the current limits on planetary companions for G29-38, the only nearby white dwa…
Measurement of Noisy Absorption Lines Using the Apparent Optical Depth Technique
Savage, Blair D.; Fox, Andrew J.; Wakker, Bart P.
To measure the column densities of interstellar and intergalactic gas clouds using absorption-line spectroscopy, the apparent optical depth (AOD) technique of Savage & Sembach can be used instead of a curve-of-growth analysis or profile fit. We show that the AOD technique, while an excellent tool when applied to data with good signal-to-noise …