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XMM-Newton observations of Abell 2255: a test case of a merger after `core crossing'
Sakelliou, Irini; Ponman, Trevor J.
It has been known that Abell 2255 is not a relaxed cluster, but it is undergoing a merger. Here, we report on the analysis of the XMM-Newton observations of this cluster. The X-ray data give us the opportunity to reveal the complexity of the cluster, especially its temperature distribution. The integrated spectrum is well fitted by a single-temper…
Overview of the coordinated ground-based observations of Titan during the Huygens mission
de Pater, Imke; Sicardy, Bruno; Buratti, Bonnie J. +50 more
Coordinated ground-based observations of Titan were performed around or during the Huygens atmospheric probe mission at Titan on 14 January 2005, connecting the momentary in situ observations by the probe with the synoptic coverage provided by continuing ground-based programs. These observations consisted of three different categories: (1) radio t…
Spitzer Observations of the Prototypical Extremely Red Objects HR 10 and LBDS 53W091: Separating Dusty Starbursts from Old Elliptical Galaxies
Eisenhardt, Peter R. M.; Chary, Ranga-Ram; Stern, Daniel +1 more
We present Spitzer Space Telescope observations of the well-studied extremely red objects (EROs) HR 10 and LBDS 53W091 from 3.6 to 160 µm. These galaxies are the prototypes of the two primary classes of EROs: dusty starbursts and old, evolved galaxies, respectively. Both galaxies, as well as LBDS 53W069, another example of an old, quiescent …
Multi-wavelength study of the gravitational lens system RXS J113155.4-123155. I. Multi-epoch optical and near infrared imaging
Altieri, B.; Jean, C.; Surdej, J. +6 more
Aims.RXS J113155.4-123155 (z=0.66) is a quadruply imaged lensed quasar with a resolved Einstein Ring. The goal of this paper is to provide a full characterization of this system, and more particularly accurate astrometry and photometry. These observational constraints constitute a mandatory ingredient for the precise determination of the lens mass…
On the discovery of CO nighttime emissions on Titan by Cassini/VIMS: Derived stratospheric abundances and geological implications
Drossart, Pierre; Nicholson, Philip D.; Sotin, Christophe +7 more
We present a quantitative analysis of CO thermal emissions discovered on the nightside of Titan by Baines et al. [2005. The atmospheres of Saturn and Titan in the near-infrared: First results of Cassini/VIMS. Earth, Moon, and Planets, 96, 119-147]. in Cassini/VIMS spectral imagery. We identify these emission features as the P and R branches of the…
Electron Density and Turbulence Gradients within the Extended Atmosphere of the M Supergiant Betelgeuse (α Orionis)
Harper, Graham M.; Brown, Alexander
The extended atmosphere of the M supergiant Betelgeuse is complex with cool plasma dominating the structure by mass and small amounts of embedded hotter chromospheric plasma. A major challenge is to understand the interrelationship and juxtaposition of these different components, which in turn may provide clues to the nature of the process of nonr…
A multi-wavelength census of star formation activity in the young embedded cluster around Serpens/G3-G6
Olofsson, G.; André, Ph.; Bontemps, S. +4 more
Aims.The aim of this paper is to characterise the star formation activity in the poorly studied embedded cluster Serpens/G3-G6, located ~45 arcmin (3 pc) to the south of the Serpens Cloud Core, and to determine the luminosity and mass functions of its population of Young Stellar Objects (YSOs).
Methods: .Multi-wavelength broadband photometry …
Nuclear embedded star clusters in NGC 7582*
Galliano, E.; Wold, M.
We report on the discovery of several compact regions of mid-infrared emission in the star-forming circumnuclear disc of the starburst/Seyfert 2 galaxy NGC 7582. The compact sources do not have counterparts in the optical and near-infrared, suggesting that they are deeply embedded in dust. We use the [NeII] 12.8-µm line emission to estimate …
XMM-Newton observations of the Coma cluster relic 1253+275
Feretti, L.; Neumann, D. M.
Aims.Using XMM Newton data, we investigate the nature of the X-ray emission in the radio relic 1253+275 in the Coma cluster. We determine the conditions of the cluster gas to check current models of relic formation, and we set constraints on the intracluster magnetic field.
Methods: .Both imaging and spectral analysis are performed, and the X…
Dynamical Masses in Luminous Infrared Galaxies
Rieke, G. H.; Hinz, J. L.
We have studied the dynamics and masses of a sample of 10 nearby luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs, respectively) using 2.3 µm 12CO-absorption line spectroscopy and near-infrared H- and Ks-band imaging. By combining velocity dispersions derived from the spectroscopy, disk scale lengths obtai…