Search Publications
X-Ray Observations of the W 51 Complex with Suzaku
Fukazawa, Yasushi; Hanabata, Yoshitaka; Bamba, Aya +2 more
We present a detailed analysis of X-ray emission from the middle-aged supernova remnant W 51 C and star-forming region W 51 B with Suzaku. The soft X-ray emission from W 51 C is well-represented by an optically thin thermal plasma in a non-equilibrium ionization state with a temperature of
Is the bowshock of the runaway massive star HD 195592 a Fermi source?
De Becker, M.; Romero, G. E.; del Valle, M. V.
Context. HD 195592 is an O-type super-giant star, known as a well-established runaway. Recently, a Fermi γ-ray source (2FGL J2030.7+4417) with a position compatible with that of HD 195592 has been reported.
Aims: Our goal is to explore the scenario where HD 195592 is the counterpart of the Fermi γ-ray source, modeling the non-thermal emission…
Suzaku Observations of the X-Ray Brightest Fossil Group ESO 3060170
Miller, Eric D.; White, Raymond E., III; Su, Yuanyuan
"Fossil" galaxy groups, each dominated by a relatively isolated giant elliptical galaxy, have many properties intermediate between groups and clusters of galaxies. We used the Suzaku X-ray observatory to observe the X-ray brightest fossil group, ESO 3060170, out to R 200, in order to better elucidate the relation between fossil groups, …
Nighttime photochemical model and night airglow on Venus
Krasnopolsky, Vladimir A.
The photochemical model for the Venus nighttime atmosphere and night airglow (Krasnopolsky, 2010, Icarus 207, 17-27) has been revised to account for the SPICAV detection of the nighttime ozone layer and more detailed spectroscopy and morphology of the OH nightglow. Nighttime chemistry on Venus is induced by fluxes of O, N, H, and Cl with mean hemi…
Pushing the limits of the Gaia space mission by analyzing galaxy morphology
Ducourant, C.; Gavras, P.; Galluccio, L. +6 more
Context. The ESA Gaia mission, to be launched during 2013, will observe billions of objects, among which many galaxies, during its 5 yr scanning of the sky. This will provide a large space-based dataset with unprecedented spatial resolution.
Aims: Because of its natural Galactic and astrometric priority, Gaia's observational strategy was opti…
Amorphous carbon in the disk around the post-AGB binary HR 4049. Discerning dust species with featureless opacity curves
Verhoelst, T.; Acke, B.; Lombaert, R. +7 more
Context. Infrared spectroscopy has been extensively used to determine the mineralogy of circumstellar dust. The identification of dust species with featureless opacities, however, is still ambiguous. Here we present a method to lift the degeneracy using the combination of infrared spectroscopy and interferometry.
Aims: The binary post-AGB sta…
Cluster observations of hot flow anomalies with large flow deflections: 2. Bow shock geometry at HFA edges
Zong, Qiugang; Zhang, Hui; Wang, Shan
Case and statistical studies of the bow shock geometry at hot flow anomaly (HFA) edges have been performed based on 87 HFAs with large flow deflections observed by the Cluster C1 spacecraft from 2003 to 2009. The results suggest that HFAs can be formed at both quasi-parallel and quasi-perpendicular shocks. In an accompanying paper, we show that th…
Galaxies in X-Ray Groups. III. Satellite Color and Morphology Transformations
Ma, Chung-Pei; Leauthaud, Alexie; Vulcani, Benedetta +5 more
While the star formation rates and morphologies of galaxies have long been known to correlate with their local environment, the process by which these correlations are generated is not well understood. Galaxy groups are thought to play an important role in shaping the physical properties of galaxies before entering massive clusters at low redshift…
IMF dependence of the azimuthal direction of earthward magnetotail fast flows
Nilsson, H.; Hamrin, M.; Norqvist, P. +2 more
Cluster magnetotail data together with ACE solar wind data from 2001 to 2009 are used to investigate the dependence of the azimuthal flow direction of earthward magnetotail fast flows on the interplanetary magnetic field (IMF). We find an indication that fast flows have favored azimuthal directions that have dependence on the IMF. Our results sugg…
Multi-wavelength landscape of the young galaxy cluster RX J1257.2+4738 at z = 0.866. I. The infrared view
Altieri, B.; Cepa, J.; Valtchanov, I. +16 more
Context. Many studies have shown how galaxy properties (e.g. colours, morphology, star-forming (SF) activity, active galactic nuclei population) change not only with redshift, but also with local galaxy density, revealing the important effect of the stellar/halo mass and the environment in the evolution of galaxies. A detailed analysis of the star…