Search Publications
Turbulent Convection Model in the Overshooting Region. I. Effects of the Convective Mixing in the Solar Overshooting Region
Li, Y.; Zhang, Q. S.
The overshooting in the framework of the turbulent convection model is investigated in the solar overshooting region. The overshooting mixing is treated as a diffusive process. It is found that the sound speed profile can be improved to be in good agreement with helioseismic inversions. The bump in the sound speed differences between solar models …
X-ray variations in the inner accretion flow of dwarf novae
Revnivtsev, M.; Balman, Ş.
Aims: We study the inner disk structure of dwarf novae (DNe; i.e., nonmagnetic cataclysmic variables).
Methods: We performed power spectral analysis of the X-ray light curves obtained using the Rossi X-ray Timing Explorer (RXTE) and X-ray Multi-mirror Mission (XMM-Newton) data. We fit the power spectra with a simple model that describes …
Pervasive Linear Polarization Signals in the Quiet Sun
Bellot Rubio, L. R.; Orozco Suárez, D.
This paper investigates the distribution of linear polarization signals in the quiet-Sun internetwork using ultra-deep spectropolarimetric data. We reduce the noise of the observations as much as is feasible by adding single-slit measurements of the Zeeman-sensitive Fe I 630 nm lines taken by the Hinode spectropolarimeter. The integrated Stokes sp…
The cratering history of asteroid (21) Lutetia
Sierks, H.; Mottola, S.; Barbieri, C. +9 more
The European Space Agency's Rosetta spacecraft passed by the main belt asteroid (21) Lutetia on 10th July 2010. With its ∼100km size, Lutetia is one of the largest asteroids ever imaged by a spacecraft. During the flyby, the on-board OSIRIS imaging system acquired spectacular images of Lutetia's northern hemisphere revealing a complex surface scar…
A New Sample of Candidate Intermediate-mass Black Holes Selected by X-Ray Variability
Awaki, Hisamitsu; Terashima, Yuichi; Kamizasa, Naoya
We present the results of X-ray variability and spectral analysis of a sample of 15 new candidates for active galactic nuclei with relatively low-mass black holes (BHs). They are selected from the Second XMM-Newton Serendipitous Source Catalogue based on strong variability quantified by normalized excess variances. Their BH masses are estimated to…
The 2009-2010 fade of Jupiter's South Equatorial Belt: Vertical cloud structure models and zonal winds from visible imaging
Sánchez-Lavega, A.; Rojas, J. F.; Pérez-Hoyos, S. +3 more
The South Equatorial Belt (SEB) of Jupiter is known to alternate its appearance at visible wavelengths from a classical belt-like band most of the time to a short-lived zone-like aspect which is called a "fade" of the belt, hereafter SEBF. The albedo change of the SEB is due to a change in the structure and properties of the clouds and upper hazes…
The G305 star-forming complex: embedded massive star formation discovered by Herschel Hi-GAL
Molinari, S.; Veneziani, M.; Thompson, M. A. +7 more
We present a Herschel far-infrared study towards the rich massive star-forming complex G305, utilizing PACS 70, 160 µm and SPIRE 250, 350, and 500 µm observations from the Hi-GAL survey of the Galactic plane. The focus of this study is to identify the embedded massive star-forming population within G305, by combining far-infrared data …
The jet-cloud interacting radio galaxy PKS B2152-699 - I. Structures revealed in new deep radio and X-ray observations
Young, A. J.; Birkinshaw, M.; Worrall, D. M. +5 more
PKS B2152-699, which has radio power characteristic of sources that dominate radio feedback, is exceptional in showing a wide range of features associated with radio-galaxy/gas interactions. We present new deep radio (Australia Telescope Compact Array), X-ray (Chandra) and ground-based optical observations, and test the energetics of the feedback …
Titan's lakes chemical composition: Sources of uncertainties and variability
Lunine, J. I.; Cordier, D.; Mousis, O. +5 more
Between 2004 and 2007 the instruments of the Cassini spacecraft, orbiting within the Saturn system, discovered dark patches in the polar regions of Titan. These features are interpreted as hydrocarbon lakes and seas with ethane and methane identified as the main compounds. In this context, we have developed a lake-atmosphere equilibrium model allo…
The evolutionary connection between QSOs and SMGs: molecular gas in far-infrared luminous QSOs at z ∼ 2.5
Ivison, R. J.; Clements, D. L.; de Zotti, G. +23 more
We present Institut de Radioastronomie Millimétrique Plateau de Bure Interferometer observations of the 12CO (3-2) emission from two far-infrared luminous QSOs at z ∼ 2.5 selected from the Herschel-Astrophysical Tetrahertz Large Area Survey. These far-infrared bright QSOs were selected to have supermassive black holes (SMBHs) with masse…