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Possible non-thermal nature of the soft-excess emission in the cluster of galaxies Sérsic 159-03
Kaastra, J. S.; Vink, J.; Tamura, T. +3 more
We present an analysis of new Suzaku data and archival data from XMM-Newton of the cluster of galaxies Sérsic 159-03, which has a strong soft X-ray excess emission component. The Suzaku observation confirms the presence of the soft excess emission, but it does not confirm the presence of redshifted O VII lines in the cluster. Radial profiles and 2…
On the location of dayside magnetic reconnection during an interval of duskward oriented IMF
Balogh, A.; Davies, J. A.; Wild, J. A. +7 more
We present space- and ground-based observations of the signatures of magnetic reconnection during an interval of duskward-oriented interplanetary magnetic field on 25 March 2004. In situ field and plasma measurements are drawn from the Double Star and Cluster satellites during traversals of the pre-noon sector dayside magnetopause at low and high …
The Ly α and Ly β Profiles in Solar Prominences and Prominence Fine Structure
Vial, J. -C.; Ajabshirizadeh, A.; Ebadi, H.
Ly α and Ly β line profiles in a solar prominence were observed with high spatial and spectral resolution with SOHO/SUMER. Within a 60-arcsec scan, we measure a very large variety of profiles: not only reversed and nonreversed profiles but also red-peaked and blue-peaked ones in both lines. Such a spatial variability is probably related to both th…
A new superwind galaxy: XMM-Newton observations of NGC 6810
Strickland, David K.
We present the first imaging X-ray observation of the highly inclined (i = 78°) Sab Seyfert 2 galaxy NGC 6810 using XMM-Newton, which reveals soft X-ray emission that extends out to a projected height of ~7 kpc away from the plane of the galaxy. The soft X-ray emission beyond the optical disc of the galaxy is most plausibly extraplanar, although i…
E-type asteroid (2867) Steins: flyby target for Rosetta
Barucci, M. A.; Fulchignoni, M.; Vernazza, P. +3 more
Aims:The mineralogy of the asteroid (2867) Steins was investigated in the framework of a ground-based science campaign dedicated to the future encounter with Rosetta spacecraft.
Methods: Near-infrared (NIR) spectra of the asteroid in the 0.8-2.5 µm spectral range have been obtained with SpeX/IRTF in remote-observing mode from Meudon, Fra…
On the dynamic nature of the prolate solar chromosphere: jet formation
Filippov, B.; Koutchmy, S.; Vilinga, J.
Context: In "cool" spectral lines, the smoothed upper edge of the solar chromosphere is prolate in the South-North direction at the epoch of minimum solar activity and nearly spherically symmetric at the maximum phase. We attribute the effect to the dynamical nature of the upper chromosphere, which consists of a large number of small jet-like stru…
An X-Ray Spectral Analysis of the Central Regions of NGC 4593
Kaiser, Mary Elizabeth; Brenneman, Laura W.; Wilms, Jörn +1 more
We present a detailed analysis of XMM-Newton EPIC-pn data for the Seyfert 1 galaxy NGC 4593. We discuss the X-ray spectral properties of this source, as well as its variations with time. The 0.5-10 keV spectrum shows significant complexity beyond a simple power-law form, with clear evidence existing for a ``soft excess,'' as well as absorption by …
XMM observation of 1RXS J180431.1-273932: a new M-type X-ray binary with a 494 s-pulse period neutron star?
Guainazzi, M.; Nucita, A. A.; Carpano, S.
Context: Low-mass X-ray binaries are peculiar binary systems composed of a compact object and a low-mass star. Recently, a new class of these systems, known as symbiotic X-ray binaries (with a neutron star with a M-type giant companion), has been discovered.
Aims: Here, we present long-duration XMM observations of the source 1RXS J180431.1-273…
A longer XMM-Newton look at I Zwicky - 1. Distinct modes of X-ray spectral variability
Brandt, W. N.; Costantini, E.; Fabian, A. C. +1 more
The short-term spectral variability of the narrow-line Seyfert 1 galaxy I Zwicky 1 (I Zw 1) as observed in an 85ks XMM-Newton observation is discussed in detail. I Zw 1 shows distinct modes of variability prior to and after a flux dip in the broad-band light curve. Before the dip the variability can be described as arising from changes in shape an…
The Star-forming Region NGC 346 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations. II. Photometric Study of the Intermediate-Age Star Cluster BS 90
Henning, Thomas; Gouliermis, Dimitrios A.; Dolphin, Andrew E. +2 more
We present the results of our investigation of the intermediate-age star cluster BS 90, located in the vicinity of the H II region N66 in the SMC, observed with HST ACS. The high-resolution data provide a unique opportunity for a very detailed photometric study performed on one of the rare intermediate-age rich SMC clusters. The complete set of ob…