Search Publications
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…
The Magellanic Bridge: evidence for a population of X-ray binaries
Haberl, F.; Coe, M. J.; Bird, A. J. +3 more
INTEGRAL observations of the Small Magellanic Cloud region have resulted in the serendipitous detection of two transient hard X-ray sources in the Magellanic Bridge. In this paper, we present the timing and spectral characteristics of these sources across the 2-100keV energy range, which, in conjunction with their optical counterparts, demonstrate…
Linear radio structures in selected Seyfert galaxies
Richards, A. M. S.; Thean, A. H. C.; Pedlar, A. +1 more
High-resolution Multi-Element Radio Linked Interferometer Network 5-GHz observations of seven Seyfert galaxies, selected as the ones previously showing evidence of collimated ejection, have been compared with high-resolution Hubble Space Telescope data. A radio and optical/near-ultraviolet emission correlation is apparent in all the sources. The r…
Kinematics and velocity ellipsoid of the F giants
Branham, Richard L., Jr.
To study the kinematics of the F giant stars (luminosity class III), proper motions taken from van Leeuwen's new reduction of the Hipparcos catalogue are used. 591 stars, of which 222 have radial velocities, were used in the final study. Semi-definite programming solves for the kinematical parameters such as the Oort constants and simultaneously f…