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On the variability of the iron Kα line in Mrk 841
Nandra, K.; Petrucci, P. O.; Longinotti, A. L. +1 more
Petrucci et al. have recently reported the extraordinary behaviour of the iron Kα line in the Type I active galactic nucleus Mrk 841. At the XMM-Newton/EPIC resolution, a narrow line was observed in a short observation, which then apparently disappeared around 0.5 d later when another observation was performed. The limits are such that the line ca…
Comparison Between Halo cme Expansion Speeds Observed on the Sun, the Related Shock Transit Speeds to Earth and Corresponding Ejecta Speeds at 1 au
Schwenn, R.; Vieira, L. E. A.; Echer, E. +5 more
We have compared characteristics of 38 halo coronal mass ejections observed on the Sun by the Large Angle and Spectrometric Coronagraph onboard SOHO with their corresponding counterparts observed near Earth by the magnetic field and plasma instruments onboard the ACE, WIND and SOHO satellites, in the period from January 1997 to April 2001. We only…
The host galaxy of GRB 990712
Christensen, L.; Vreeswijk, P.; Gorosabel, J. +4 more
We present a comprehensive study of the z=0.43 host galaxy of
Chandra ACIS and XMM-Newton EPIC Observations of the X-Ray-Luminous SN 1978K in NGC 1313
Kaaret, Philip; Schlegel, Eric M.; Kong, Albert +2 more
We describe an observation of the X-ray-luminous SN 1978K in NGC 1313 using the ACIS detector on board Chandra and an archival XMM-Newton EPIC observation. The models that provided good fits to the ASCA SIS and GIS and the ROSAT PSPC spectra no longer do so for the ACIS and EPIC spectra. The best-fit models to the ACIS and EPIC spectra are dual ho…
The dwarf galaxy population in Abell 2218
Driver, Simon P.; De Propris, Roberto; Nulsen, Paul E. J. +2 more
We present results from a deep photometric study of the rich galaxy cluster Abell 2218 (z= 0.18) based on archival Hubble Space Telescope WFPC2 F606W images. These have been used to derive the luminosity function to extremely faint limits (MF606W~-13.2 mag, µ0~ 24.7 mag arcsec-2) over a wide field of view (1.…
Constraining the very heavy elemental abundance peak in the chemically peculiar star χ Lupi, with new atomic data for Os II and Ir II
Leckrone, D. S.; Lundberg, H.; Wahlgren, G. M. +2 more
The determination of elemental abundances plays an important role in understanding the atmospheric processes that lead to anomalies in spectra of chemically peculiar stars. Ongoing study of the HgMn star χ Lupi has defined much of the elemental abundance distribution but progress is dependent upon the availability and accuracy of the atomic data. …
Phase Variation in the Pulse Profile of SMC X-1
Neilsen, J.; Hickox, R. C.; Vrtilek, S. D.
We present the results of the timing and spectral analysis of X-ray high-state observations of the high-mass X-ray pulsar SMC X-1 with Chandra, XMM-Newton, and ROSAT, taken between 1991 and 2001. The source has LX~(3-5)×1038 ergs s-1, and the spectra can be modeled as a power law plus blackbody with kTBB…
Mid-infrared selection of AGN
Siebenmorgen, R.; Schartel, N.; Haas, M. +6 more
Since a large fraction of active galactic nuclei (AGN) is missed in common UV-excess surveys and is even hard to find in radio, near-IR and X-ray surveys, we have used a new AGN selection technique which is expected to be not affected by extinction. Within the scientific verification of the ISOCAM Parallel Survey at 6.7 µm we have discovered…
A spectral and spatial analysis of η Carinae's diffuse X-ray emission using CHANDRA
Weis, K.; Bomans, D. J.; Davidson, K. +1 more
The luminous unstable star (star system) η Carinae is surrounded by an optically bright bipolar nebula, the Homunculus and a fainter but much larger nebula, the so-called outer ejecta. As images from the EINSTEIN and ROSAT satellites have shown, the outer ejecta is also visible in soft X-rays, while the central source is present in the harder X-ra…
Derivation of electric potential patterns in the inner magnetosphere from Cluster EDI data: Initial results
Torbert, R. B.; Matsui, H.; Quinn, J. M. +2 more
Electric potential patterns are derived in the inner magnetosphere at 4 < L < 10 using 2 years of data from the Electron Drift Instrument (EDI) on Cluster. First, we examine the relations between the electric field and the following three parameters to understand how the potential patterns are organized: BZ component of the interp…