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Fluctuations of the intergalactic ionization field at redshift z ~ 2
Reimers, D.; Hagen, H. -J.; Levshakov, S. A. +2 more
Aims: To probe the spectral energy distribution (SED) of the ionizing background radiation at z ≲ 2 and to specify the sources contributing to the intergalactic radiation field.
Methods: The spectrum of a bright quasar
The turbulence evolution in the high β region of the Earth's foreshock
Yuan, Zhigang; Huang, Shiyong; Zhou, Meng +5 more
In this paper, we study the foreshock turbulence evolution in high β region via both Cluster observation on 29 March 2002 and 1-D hybrid simulation. The quasi-sinusoidal and the irregular wave trains are both detected in this event. The former one is believed to be generated by ion-ion right-hand nonresonant instability due to the right-hand polar…
Distribution of CO2 in Saturn's Atmosphere from Cassini/cirs Infrared Observations
Flasar, F. M.; Achterberg, R. K.; Jennings, D. E. +9 more
This paper focuses on the CO2 distribution in Saturn's atmosphere based on analysis of infrared spectral observations of Saturn made by the Composite Infrared Spectrometer aboard the Cassini spacecraft. The Cassini spacecraft was launched in 1997 October, inserted in Saturn's orbit in 2004 July, and has been successfully making infrared…
Growing evidence for a core formation threshold traced in Herschel Gould Belt survey clouds
André, Ph.; Arzoumanian, D.; Palmeirim, P. +3 more
It has already been suggested that a threshold in column density - or in visual extinction - may need to be exceeded to form dense cores and then protostars. Based on Herschel Gould Belt survey results in the Aquila and Orion B molecular cloud complexes we observe clear connection between the locations of the detected prestellar cores and their ba…
WR 138: new results from X-ray and optical spectroscopy
Nazé, Y.; Rauw, G.; De Becker, M. +2 more
Context. Massive-binary evolution models predict that some systems will go through an evolutionary phase where the original primary has become a supernova and left a compact object behind that then orbits a Wolf-Rayet (WR) star. WR 138 is an X-ray bright WR star that has been described as a triple system, including a compact companion in a short-p…
Recent Developments in Astrophysical and Cosmological Exploitation of Microwave Surveys
Khatri, Rishi; Pointecouteau, Etienne; Toffolatti, Luigi +13 more
In this paper, we focus on the astrophysical results and the related cosmological implications derived from recent microwave surveys, with emphasis to those coming from the Planck mission. We critically discuss the impact of systematic effects and the role of methods to separate the cosmic microwave background (CMB) signal from the astrophysical e…
Unexpected Ionization Structure in Eta Carinae's "Weigelt Knots"
Davidson, Kris; Mehner, Andrea; Remmen, Grant N.
The Weigelt knots, dense slow-moving ejecta near η Carinae, are mysterious in structure as well as in origin. Using spatially dithered spectrograms obtained with the Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS), we have partially resolved the ionization zones of one knot. Contrary to simple models, higher ionization level…
Aligned grains and inferred toroidal magnetic fields in the envelopes of massive young stellar objects
Schneider, Glenn; Hines, Dean C.; Wolff, Michael J. +6 more
Massive young stellar objects (YSOs), like low-mass YSOs, are thought to be surrounded by optically thick envelopes and/or discs and are observed to have associated regions that produce polarized light at near-infrared wavelengths. These polarized regions are thought to be lower density outflows along the polar axes of the YSO envelopes. Using the…
Statistical Study of 2XMMi-DR3/SDSS-DR8 Cross-correlation Sample
Zhao, Yong-Heng; Wu, Xue-Bing; Zhou, Xin-Lin +1 more
Cross-correlating the XMM-Newton 2XMMi-DR3 catalog with the Sloan Digital Sky Survey (SDSS) Data Release 8, we obtain one of the largest X-ray/optical catalogs and explore the distribution of various classes of X-ray emitters in the multidimensional photometric parameter space. Quasars and galaxies occupy different zones while stars scatter in the…
Binary Star Synthetic Photometry and Distance Determination Using BINSYN
Linnell, Albert P.; Hubeny, Ivan; DeStefano, Paul
This paper extends synthetic photometry to components of binary star systems. The paper demonstrates accurate recovery of single star photometric properties for four photometric standards, Vega, Sirius, GD153, and HD209458, ranging over the HR diagram, when their model synthetic spectra are placed in fictitious binary systems and subjected to synt…