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Characterization of zonal winds in the stratosphere of Titan with UVES: 2. Observations coordinated with the Huygens Probe entry
Livengood, T.; Kostiuk, T.; Witasse, O. +8 more
The Huygens Probe has successfully entered Titan's atmosphere and landed on its surface on 14 January 2005. With the aim of characterizing the zonal wind flow in Titan's stratosphere close to the time of entry, coordinated observations were carried out at the Very Large Telescope on the nights of 7, 12, 14, and 15 January. As in our previous inves…
XMM-Newton observations of the Seyfert 1 AGN H0557-385
Page, M. J.; Branduardi-Raymont, G.; Blustin, A. J. +1 more
We present XMM-Newton observations of the Seyfert 1 active galactic nucleus (AGN) H0557-385. We have conducted a study into the warm absorber present in this source, and using high-resolution Reflection Grating Spectrometer (RGS) data we find that the absorption can be characterized by two phases: a phase with log ionization parameter ξ of 0.50 (w…
Calibration of space instrumentation with synchrotron radiation
Richter, M.; Gottwald, A.; Scholze, F. +2 more
For many years, synchrotron radiation as emitted from electron storage rings has been established as a versatile tool for photon metrology in the spectral range from ultraviolet radiation to X-rays. In particular, various radiometric techniques have been developed and applied for the calibration of space instrumentation. In this context, the prese…
Evidence for an Hesperian-aged South Circum-Polar Lake Margin Environment on Mars
Head, James W.; Dickson, James
A broad pitted plain and an elongated low rise occur near the south pole of Mars between a region of major cavi (Cavi Angusti) and a regionally smooth and broad valley (Argentea Planum). Viking, Mars Global Surveyor (MGS), and Odyssey data reveal a densely pitted plain covering ∼6750 km 2, and containing >300 irregularly shaped, stee…
The Outskirts of Spiral Galaxies: Evidence for Multiple Stellar Populations
Mouhcine, M.
We present an analysis of the metallicity distribution functions of fields projected along the minor axis for a sample of inclined spiral galaxies in order to search for evidence of the presence of multiple stellar populations. In all cases, with very high confidence levels, the stellar populations appear to have asymmetric metallicity distributio…
Very Cold and Massive Cores near ISOSS J18364-0221: Implications for the Initial Conditions of High-Mass Star Formation
Krause, O.; Birkmann, S. M.; Lemke, D.
We report the discovery of two very cold and massive molecular cloud cores in the region ISOSS J18364-0221. The object has been identified by a systematic search for very early evolutionary stages of high-mass stars using the 170 µm ISOPHOT Serendipity Survey (ISOSS). Submillimeter continuum and molecular line measurements reveal two compact…
An X-ray bright ERO hosting a type 2 QSO
Page, M. J.; Akiyama, M.; Carrera, F. J. +8 more
We present the XMM-Newton and the optical-VLT spectra along with the optical and the near-infrared photometric data of one of the brightest X-ray (F2{-10 keV}∼10-13 erg s-1 cm-2) extremely red objects (R-K≥5) discovered so far. The source, XBS J0216-0435, belongs to the XMM-Newton Bright Serendipitous Su…
Diffuse light and building history of the galaxy cluster Abell 2667
Kneib, J. -P.; Adami, C.; Slezak, E. +3 more
Aims.We searched for diffuse intracluster light in the galaxy cluster Abell 2667 (z=0.233) from HST images in three broad band-filters.
Methods: .We applied an iterative multi-scale wavelet analysis and reconstruction technique to these images, which allows to subtract stars and galaxies from the original images.
Results: .We detect a zone…
Strong and Weak Damping of Slow MHD Standing Waves in Hot Coronal Loops
Dwivedi, B. N.; Pandey, V. S.
Slow magnetohydrodynamic (MHD) standing wave oscillations in hot coronal loops for both strong (i.e. τd/P∼ 1) and weak (i.e. τd/P≥ 2) damping are investigated taking account of viscosity, thermal conductivity and optically thin radiation. The individual effect of the dissipative terms is not sufficient to explain the observed…
Coma revealed as an extended hard X-rays source by INTEGRAL IBIS/ISGRI
Terrier, R.; Bélanger, G.; Renaud, M. +2 more
Aims.We report the INTEGRAL/IBISobservations of the Coma Clusterin the hard X-ray/soft γ-raydomain.
Methods: .Since the Coma Clusterappears as an extended source, its global intensity and significance cannot be directly extracted with standard coded mask analysis. We used the method of imaging the extended sources with a coded mask telescope d…