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Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685
G. I. G. Jozsa, T. A. Oosterloo, R. Morganti +2
This is the third of a series of papers in which the structure and kinematics of disk galaxies is studied. Employing direct tilted-ring fits to the data cube as introduced in Paper…
HI holes and high-velocity clouds in the spiral galaxy NGC 6946
R. Boomsma, T. A. Oosterloo, F. Fraternali +2
We present a study of the distribution and kinematics of the neutral gas in the low-inclination Scd galaxy NGC 6946. The galaxy has been observed for 192 hours at 21-cm with the We…
From major merger to radio galaxy: low surface-brightness stellar counterpart to the giant HI ring around B2 0648+27
B. H. C. Emonts, R. Morganti, J. H. van Gorkom +3
We present the detection of a low surface-brightness stellar counterpart to an enormous (190 kpc) ring of neutral hydrogen (HI) gas that surrounds the nearby radio galaxy B2 0648+2…
APERTIF, a focal plane array for the WSRT
M. A. W. Verheijen, T. A. Oosterloo, W. A. van Cappellen +3
In this paper we describe a focal plane array (FPA) prototype, based on Vivaldi elements, developed for the Westerbork Synthesis Radio Telescope (WSRT) to increase its instantaneou…
Enormous disc of cool gas surrounding the nearby powerful radio galaxy NGC 612 (PKS 0131-36)
B. H. C. Emonts, R. Morganti, T. A. Oosterloo +5
We present the detection of an enormous disc of cool neutral hydrogen (HI) gas surrounding the S0 galaxy NGC 612, which hosts one of the nearest powerful radio sources (PKS 0131-36…
A circumnuclear disk of atomic hydrogen in Centaurus A
R. Morganti, T. Oosterloo, C. Struve +1
We present new observations, performed with the Australia Telescope Compact Array, of the HI absorption in the central regions of Centaurus A. For the first time, absorption is det…
The HI content of the advanced merger NGC 4441
Eva Manthey, Susanne Aalto, Susanne Huettemeister +1
NGC 4441 is a candidate for a merger between a spiral and an elliptical galaxy (S+E merger), because it shows typical tidal structures such as an optical tail and two shells. With…
The origin of the infrared emission in radio galaxies I: new mid- to far-infrared and radio observations of the 2Jy sample
D. Dicken, C. Tadhunter, R. Morganti +3
As part of a large study to investigate the nature of the longer wavelength continuum emission of radio-loud AGN, we present new mid to far-infrared (MFIR) and high frequency radio…
Cold gas accretion in galaxies
R. Sancisi, F. Fraternali, T. Oosterloo +1
Evidence for the accretion of cold gas in galaxies has been rapidly accumulating in the past years. HI observations of galaxies and their environment have brought to light new fact…
Cold gas & mergers: fundamental difference in HI properties of different types of radio galaxies?
Bjorn Emonts, Raffaella Morganti, Tom Oosterloo +1
We present results of a study of large-scale neutral hydrogen (HI) gas in nearby radio galaxies. We find that the early-type host galaxies of different types of radio sources (comp…
Stellar populations, neutral hydrogen and ionised gas in field early-type galaxies
Paolo Serra, Scott C. Trager, Tom A. Oosterloo +1
We present a study of the stellar populations of a sample of 39 local, field early-type galaxies whose HI properties are known from interferometric data. Our aim is to understand w…
Anomalous HI Gas in NGC 4395: Signs of Gas Accretion
George Heald, Tom Oosterloo
In recent years, it has become clear that large quantities of gas reside in the halos of many spiral galaxies. Whether the presence of this gas is ultimately a consequence of star…
The Local Group dwarf Leo T: HI on the brink of star formation
Emma V. Ryan-Weber, Ayesha Begum, Tom Oosterloo +5
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork ynthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H…
Is NGC 3108 transforming itself from an early to late type galaxy -- an astronomical hermaphrodite?
George Hau, Richard Bower, Virginia Kilborn +3
A common feature of hierarchical galaxy formation models is the process of "inverse" morphological transformation: a bulge dominated galaxy accretes a gas disk, dramatically reduci…
The shape of the dark matter halo in the early-type galaxy NGC 2974
Anne-Marie Weijmans, Davor Krajnovic, Glenn van de Ven +3
We present HI observations of the elliptical galaxy NGC 2974, obtained with the Very Large Array. These observations reveal that the previously detected HI disc in this galaxy (Kim…
IC5063: AGN driven outflow of warm and cold gas
R. Morganti, J. Holt, L. Saripalli +2
We present new ATCA 17- and 24-GHz radio images and ESO-NTT optical spectra of the radio-loud Seyfert galaxy IC5063, the first galaxy in which a fast (~ 600 km/s) outflow of neutra…
GRB 030329: three years of radio afterglow monitoring
A. J. van der Horst, A. Kamble, R. A. M. J. Wijers +7
Radio observations of gamma-ray burst (GRB) afterglows are essential for our understanding of the physics of relativistic blast waves, as they enable us to follow the evolution of…
GRB 030329: 3 years of radio afterglow monitoring
A. J. van der Horst, A. Kamble, R. A. M. J. Wijers +7
Radio observations of gamma-ray burst (GRB) afterglows are essential for our understanding of the physics of relativistic blast waves, as they enable us to follow the evolution of…
Detailed study of the GRB 030329 radio afterglow deep into the non-relativistic phase
A. J. van der Horst, A. Kamble, L. Resmi +8
We explore the physics behind one of the brightest radio afterglows ever, GRB 030329, at late times when the jet is non-relativistic. We determine the physical parameters of the bl…
The cold gaseous halo of NGC 891
Tom Oosterloo, Filippo Fraternali, Renzo Sancisi
We present HI observations of the edge-on galaxy NGC 891. These are among the deepest ever performed on an external galaxy. They reveal a huge gaseous halo, much more extended than…
Kinematic modelling of disk galaxies I. A new method to fit tilted rings to data cubes
Gyula I. G. Jozsa, Franz Kenn, Uli Klein +1
This is the first of a series of papers in which the kinematics of disk galaxies over a range of scales is scrutinised employing spectroscopy. A fundamental aspect of these studies…
Extended, regular HI structures around early-type galaxies
T. Oosterloo, R. Morganti, E. M. Sadler +2
We discuss the morphology and kinematics of the HI of a sample of 30 southern gas-rich early-type galaxies selected from the HI Parkes All-Sky Survey (HIPASS). This is the largest…
Large-scale HI in nearby radio galaxies: segregation in neutral gas content with radio source size
B. H. C. Emonts, R. Morganti, T. A. Oosterloo +3
We present results of a study of neutral hydrogen (HI) in a complete sample of nearby non-cluster radio galaxies. We find that radio galaxies with large amounts of extended HI (M_H…
Fast neutral outflows in nearby radio galaxies: a major source of feedback
Raffaella Morganti, Clive Tadhunter, Tom Oosterloo +2
Fast (~1000 km/s) outflows of neutral gas (from 21-cm HI absorption) are detected in strong radio sources. The outflows occur, at least in some cases, at distances from the radio c…