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INTEGRAL and XMM-Newton observations of GRB 040106
Tiengo, A.; Götz, D.; McGlynn, S. +10 more
On January 6th 2004, the IBAS burst alert system triggered the 8th gamma-ray burst (GRB) to be located by the INTEGRAL satellite. The position was determined and publicly distributed within 12 s, prompting ESA's XMM-Newton to execute a ToO observation just 5 h later, during which an X-ray afterglow was detected. The GRB had a duration ~52 s with t…
Influence of random magnetic field on solar global oscillations: The incompressible f-mode
Erdélyi, R.; Kerekes, A.; Mole, N.
The discrepancies between theoretically predicted and observed frequencies of solar global oscillations (e.g. p- and f-modes) have attracted major attention in the past decades. The f-mode is essentially a surface wave hence the mode frequencies are less likely to be influenced by the solar stratification. Most probably then the discrepancies are …
Density irregularities in the plasmasphere boundary layer: Cluster observations in the dusk sector
André, M.; Décréau, P. M. E.; Canu, P. +7 more
We present observations of plasma density structures crossed by the CLUSTER spacecraft constellation near orbit perigee, with the spacecraft located in the vicinity of the plasmapause boundary. Although the constellation is not arranged as a perfect tetrahedron, the four-point measurements reveal interesting properties of density structures, unkno…
A large spin-up rate measured with INTEGRAL in the high mass X-ray binary pulsar SAX J2103.5+4545
Mereghetti, S.; Santangelo, A.; Sidoli, L. +7 more
The High Mass X-ray Binary Pulsar SAX J2103.5+4545 has been observed with INTEGRAL several times during the last outburst in 2002-2004. We report a comprehensive study of all INTEGRAL observations, allowing a study of the pulse period evolution during the recent outburst. We measured a very rapid spin-up episode, lasting 130 days, which decreased …
Kinematics of nearby subdwarf stars
Wielen, R.; Jahreiß, H.; Fuchs, B. +1 more
We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al. (1994, AJ, 107, 22 40). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho 2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicit…
X-Rays from Cepheus A East and West
Tsuboi, Yohko; Pravdo, Steven H.
We report the discovery of X-rays from both components of Cepheus A, East and West, with the XMM-Newton observatory. HH 168 joins the ranks of other energetic Herbig-Haro objects that are sources of T>=106 K X-ray emission. The effective temperature of HH 168 is T=5.8+3.5-2.3×106 K, and its unabsorbed…
Exceptional H2 emission in the Antennae galaxies: Pre-starburst shocks from the galaxy collision
Klaas, U.; Haas, M.; Chini, R.
The collision of gas-rich galaxies is believed to produce strong shocks between their gas clouds which cause the onset of the observed bursts of extended star formation. However, the so far observed shock signatures in colliding galaxies can be explained essentially by winds from already existing massive stars and supernovae and thus do not give a…
Hubble Space Telescope and United Kingdom Infrared Telescope Observations of the Center of the Trifid Nebula: Evidence for the Photoevaporation of a Proplyd and a Protostellar Condensation
Geballe, T. R.; Yusef-Zadeh, F.; Biretta, J.
The Trifid Nebula (M20) is a well-known prominent optical H II region trisected by bands of obscuring dust lanes and excited by an O7.5 star, HD 164492A. Previous near-IR, mid-IR, and radio continuum observations of the cluster of stars at the center of the Trifid Nebula indicated the presence of circumstellar disks associated with hot stars with …
X-ray properties of NGC 300. I. Global properties of X-ray point sources and their optical counterparts
Schirmer, M.; Wilms, J.; Kendziorra, E. +1 more
We present X-ray properties of NGC 300 point sources, extracted from 66 ks of XMM-Newton data taken in 2000 December and 2001 January. A total of 163 sources were detected in the energy range of 0.3-6 keV. We report on the global properties of the sources detected inside the D25 optical disk, such as the hardness ratio and X-ray fluxes,…
A possible line-like emission feature at 8 keV in the Seyfert 1.2 UGC 3973
Pietsch, W.; Fabian, A. C.; Boller, Th. +1 more
Two short X-ray exposures (<3600 s each) of the radio-quiet Seyfert 1.2 galaxy UGC 3973 (Mrk 79) were conducted with XMM-Newton as part of an active galactic nucleus snapshot survey. In this paper we concentrate on the significance and possible origin of a narrow 8-keV (rest frame) line-like emission feature detected with the pn instrument duri…