Search Publications
An X-Ray View of Weak-Line Radio Galaxies/LINERs
Gliozzi, Mario; Sambruna, Rita M.; Rinn, Alexander S.
We present X-ray observations of nine weak-line radio galaxies (WLRGs), optically classified as confirmed or possible LINERs. The data were taken from the Chandra, XMM-Newton, and BeppoSAX archives. The Chandra images typically show complex X-ray morphologies, with hard (2-10 keV) point sources embedded in diffuse soft (0.3-2.0 keV) emission in al…
New runaway OB stars with HIPPARCOS
Mdzinarishvili, T. G.; Chargeishvili, K. B.
A Monte Carlo method for detection of runaway OB stars from observational data is proposed. 61 runaway OB star candidates have been detected by an analysis of Hipparcos proper motions. The peculiar tangential and total transverse velocities have been determined for these stars. A list of the detected runaway star candidates is presented. The evide…
Kinetic Helicity Density in Solar Subsurface Layers and Flare Activity of Active Regions
Howe, R.; Komm, R.; Hill, F. +2 more
We search for a relation between subsurface flows below active regions and flare events occurring in those regions. For this purpose, we use a ring-diagram analysis to determine the subsurface flows from high-resolution Global Oscillation Network Group (GONG) and Michelson Doppler Imager (MDI) data and derive the kinetic helicity as a measure of t…
The influence of gravitational lensing on the spectra of lensed quasi-stellar objects
Popović, L. Č.; Chartas, G.
We consider the influence of (milli/micro)lensing on the spectra of lensed quasi-stellar objects (QSOs). We propose a method for the observational detection of microlensing in the spectra of lensed QSOs and apply it to the spectra of three lensed QSOs (PG 1115+080, Q1413+117 and Q0957+561) observed with the Hubble Space Telescope. We find that the…
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 …