792 citations · 2.2k across the 38 of their papers we have counts for
25 papers · 1 filter
Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004: I. Inner jet kinematics
E. A. Rastorgueva, K. Wiik, T. Savolainen +4
We observed the blazar \object{0716+714} with the VLBA during its active state in 2003-2004. In this paper we discuss multi-frequency analysis of the inner jet (first 1 mas) kinema…
The magnetic field structure in NGC 253 in presence of a galactic wind
V. Heesen, M. Krause, R. Beck +1
We present radio continuum polarimetry observations of the nearby edge-on galaxy NGC 253 which possesses a very bright radio halo. Using the vertical synchrotron emission profiles…
Exploring the powering source of the TeV X-ray binary LS 5039
J. Moldon, M. Ribo, Josep M. Paredes +2
LS 5039 is one of the four TeV emitting X-ray binaries detected up to now. The powering source of its multi-wavelength emission can be accretion in a microquasar scenario or wind i…
An enigmatic HI cloud
L. Dedes, C. Dedes, P. W. M Kalberla
The discovery of an HI cloud with peculiar properties at equatorial coordinates (J2000) ra=07h49m, dec=04d30m is presented. The HI object was detected at 21cm using the 300-m NAIC…
Starbursts and torus evolution in AGN
B. Vollmer, T. Beckert, R. Davies
Recent VLT SINFONI observations of the close environments (~30pc) of nearby AGNs have shown that thick gas tori and starbursts with ages between 10 and 150Myr are frequently found.…
Stellar populations in a standard ISOGAL field in the Galactic disk
S. Ganesh, A. Omont, U. C. Joshi +4
We aim to identify the stellar populations (mostly red giants and young stars) detected in the ISOGAL survey at 7 and 15micron towards a field (LN45) in the direction l=-45, b=0.0.…
Quasi-simultaneous multi-frequency observations of inverted-spectrum GPS candidate sources
B. Vollmer, T. P. Krichbaum, E. Angelakis +1
Gigahertz-Peaked Spectrum (GPS) sources are probably the precursors of local radio galaxies.Existing GPS source samples are small (<200). It is necessary to extend the availabe sam…
Pre-peak ram pressure stripping in the Virgo cluster spiral galaxy NGC 4501
B. Vollmer, M. Soida, A. Chung +5
VIVA HI observations of the Virgo spiral galaxy NGC 4501 are presented. The HI disk is sharply truncated to the southwest, well within the stellar disk. A region of low surface-den…
Cosmic rays and the magnetic field of the nearby starburst galaxy NGC 253
V. Heesen, R. -J. Dettmar, M. Krause +1
Using radio polarimetry we study the connection between the transport of cosmic rays (CR's), the three-dimensional magnetic field structure, and features of other ISM phases in the…
A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region
Jan Forbrich, Karl M. Menten, Mark J. Reid
Aims: Our aim was to measure and characterize the short-wavelength radio emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the BN/KL star-forming region. M…
The interstellar medium of the Antennae Galaxies
A. Schulz, C. Henkel, D. Muders +3
To study the properties of the interstellar medium in the prototypical merging system of the Antennae galaxies (NGC 4038 and NGC 4039), we have obtained CO(1-0), (2-1) and (3-2) li…
Dual-frequency VSOP Imaging of a High-redshift Radio Quasar PKS 1402+044
Jun Yang, Leonid Gurvits, Andrei Lobanov +2
Based on the VLBI Space Observatory Programme (VSOP) observations at 1.6 and 5 GHz, we find that the luminous high-redshift (z=3.215) quasar PKS 1402+044 (J1405+0415) has a pronoun…
Search for Cold Debris Disks around M-dwarfs
J. -F. Lestrade, M. C. Wyatt, F. Bertoldi +2
Debris disks are believed to be related to planetesimals left over around stars after planet formation has ceased. The frequency of debris disks around M-dwarfs which account for 7…
The kinetic temperature of a molecular cloud at redshift 0.7: Ammonia in the gravitational lens B0218+357
C. Henkel, N. Jethava, A. Kraus +6
Using the Effelsberg 100-m telescope, absorption in the (J,K) = (1,1), (2,2) and (3,3) inversion lines of ammonia (NH_3) was detected at a redshift of z = 0.6847 toward the gravita…
Interactions of Jets with Inhomogeneous Cloudy Media
Curtis J. Saxton, Geoffrey V. Bicknell, Ralph S. Sutherland +1
We present two-dimensional slab-jet simulations of jets in inhomogeneous media consisting of a tenuous hot medium populated with a small filling factor by warm, dense clouds. The s…
High-Energy Processes in Young Stars: Chandra X-ray Spectroscopy of HDE 283572, RY Tau, and LkCa 21
Marc Audard, Stephen L. Skinner, Kester W. Smith +2
Weak-lined T Tauri stars (WTTS) represent the important stage of stellar evolution between the accretion phase and the zero-age main sequence. At this stage, the star decouples fro…
The Origin and Evolution of Cosmic Magnetism
B. M. Gaensler, R. Beck, L. Feretti
Magnetism is one of the four fundamental forces. However, the origin of magnetic fields in stars, galaxies and clusters is an open problem in astrophysics and fundamental physics.…
The Proper Motion of Sgr A*: II. The Mass of Sgr A*
M. J. Reid, A. Brunthaler
We report measurements with the VLBA of the position of Sgr A* with respect to two extragalactic radio sources over a period of eight years. The apparent proper motion of \sgrab re…
The IC133 Water Vapor Maser in the Galaxy M33: A Geometric Distance
A. L. Argon, L. J. Greenhill, J. M. Moran +3
We report on the results of a 14 year long VLBI study of proper motions in the IC133 H2O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the…
FUSE search for 10^5-10^6 K gas in the rich clusters of galaxies Abell 2029 and Abell 3112
A. Lecavelier des Etangs, Gopal-Krishna, F. Durret
Recent Chandra and XMM X-ray observations of rich clusters of galaxies have shown that the amount of hot gas which is cooling below ~1 keV is generally more modest than previous es…
EVN and MERLIN observations of microquasar candidates at low galactic latitudes
M. Ribo, E. Ros, J. M. Paredes +2
In an attempt to increase the number of known microquasars, Paredes et al. (2002) have presented a long-term project focused on the search for new objects of this type. They perfor…
Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs
A. O. Petric, C. L. Carilli, F. Bertoldi +5
We present 1.4 and 5 GHz observations taken with the Very Large Array (VLA), and observations at 250 GHz obtained with the Max-Planck millimeter bolometer (MAMBO) at the IRAM 30~m…
The Position, Motion, and Mass of Sgr A*
M. J. Reid, K. M. Menten, R. Genzel +4
We report progress on measuring the position of Sgr A* on infrared images, placing limits on the motion of the central star cluster relative to Sgr A*, and measuring the proper mot…
Confirmation of persistent radio jets in the microquasar LS 5039
J. M. Paredes, M. Ribo, E. Ros +2
We present here new observations conducted with the EVN and MERLIN of the persistent microquasar LS 5039 discovered by Paredes et al. (2000) with the VLBA. The new observations con…