Search Publications
Propagation of a sausage soliton in the solar lower atmosphere observed by Hinode/SOT
Khodachenko, M. L.; Zaqarashvili, T. V.; Kukhianidze, V.
Acoustic waves and pulses propagating from the solar photosphere upwards may quickly develop into shocks due to the rapid decrease of atmospheric density. However, if they propagate along a magnetic flux tube, then the non-linear steepening may be balanced by tube dispersion effects. This may result in the formation of a sausage soliton. The aim o…
Rotational variation of the spectral slope of (21) Lutetia, the second asteroid target of ESA Rosetta mission
Barbieri, C.; Barucci, M. A.; Lazzarin, M. +5 more
The ESA Rosetta mission, launched in 2004 March, will flyby the second asteroid target (21) Lutetia in 2010 July. This asteroid is quite different from (2867) Steins, encountered by Rosetta in 2008 September. Lutetia is in fact a much larger asteroid, approximately 100km of diameter, as compared to the 5 km of Steins and also its surface compositi…
VLT/FLAMES-ARGUS observations of stellar wind-ISM cloud interactions in NGC 6357
Smith, L. J.; Gallagher, J. S., III; Westmoquette, M. S. +1 more
We present optical/near-IR integral field unit observations of a gas pillar in the Galactic HII region NGC 6357 containing the young open star cluster Pismis 24. These observations have allowed us to examine in detail the gas conditions of the strong wind-clump interactions taking place on its surface.
By accurately decomposing the Hα line pr…The mass distribution of a moderate redshift galaxy group and brightest group galaxy from gravitational lensing and kinematics
Vegetti, S.; McKean, J. P.; Treu, T. +6 more
The gravitational lens system CLASS B2108+213 has two radio-loud lensed images separated by 4.56 arcsec. The relatively large image separation implies that the lensing is caused by a group of galaxies. In this paper, new optical imaging and spectroscopic data for the lensing galaxies of B2108+213 and the surrounding field galaxies are presented. T…
3D spectroscopy of local luminous compact blue galaxies: kinematics of NGC 7673
Castander, F. J.; Sánchez, S. F.; Pérez-Gallego, J. +7 more
The kinematic properties of the ionized gas of local luminous compact blue galaxy NGC 7673 are presented using three-dimensional data taken with the PPAK integral field unit at the 3.5-m telescope in the Centro Astronómico Hispano Alemán. Our data reveal an asymmetric rotating velocity field with a peak-to-peak difference of 60 kms-1. T…
Unveiling the hard X-ray spectrum from the `burst-only' source SAX J1753.5-2349 in outburst
Mereghetti, S.; Degenaar, N.; Wijnands, R. +4 more
Discovered in 1996 by BeppoSAX during a single type-I burst event, SAX J1753.5-2349 was classified as `burst-only' source. Its persistent emission, either in outburst or in quiescence, had never been observed before 2008 October, when SAX J1753.5-2349 was observed for the first time in outburst. Based on INTEGRAL observations, we present here the …
The non-evolving internal structure of early-type galaxies: the case study SDSSJ0728+3835 at z = 0.206
Treu, Tommaso; Gavazzi, Raphaël; Auger, Matthew W. +4 more
We study the internal dynamical structure of the early-type lens galaxy SDSSJ0728+3835 at z = 0.206. The analysis is based on two-dimensional kinematic maps extending out to 1.7 effective radii obtained from Keck spectroscopy, on lensing geometry and on stellar mass estimates obtained from multiband Hubble Space Telescope imaging. The data are mod…
Grey Milky Way extinction from SDSS stellar photometry
Brosch, Noah; Gorbikov, Evgeny
We report results concerning the distribution and properties of galactic extinction at high galactic latitudes derived from stellar statistics using the Sloan Digital Sky Survey (SDSS). We use the classical Wolf diagram method to identify regions with extinction, and derive the extinction and the extinction law of the dust using all five SDSS spec…
3D spectroscopy of merger Seyfert galaxy Mrk 334: nuclear starburst, superwind and the circumnuclear cavern
Moiseev, Alexei; Smirnova, Aleksandrina
We are presenting new results on kinematics and structure of the Mrk 334 Seyfert galaxy. Panoramic (3D) spectroscopy is performed at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences using the integral-field Multi-Pupil Fiber Spectrograph (MPFS) and scanning Fabry-Pérot interferometer. The deep images ha…
The XMM-Newton detection of extended emission from the nova remnant of T Pyxidis
Balman, Ş.
We report the detection of an extended X-ray nebulosity with an elongation from north-east to south-west in excess of 15 arcsec in a radial profile and imaging of the recurrent nova T Pyx using the archival data obtained with the X-ray Multi-Mirror Mission (XMM-Newton), European Photon Imaging Camera (pn instrument). The signal-to-noise ratio in t…