Tom Oosterloo

Cold gas and young stars in tidally-disturbed ellipticals at z=0 (2009)

Serra, Paolo, Oosterloo, Tom

We present an analysis of the neutral hydrogen and stellar populations of elliptical galaxies in the Tal et al. (2009) sample. Our aim is to test their conclusion that the continuing assembly of...

ESO 381-47, an early-type galaxy with extended HI and a star forming ring (2009)

Donovan, Jennifer L., Serra, Paolo, Van Gorkom, J. H., Trager, S. C., Oosterloo, Tom, Hibbard, J. E., ...

ESO 381-47 is an early type galaxy with an extended HI disk. GALEX and very deep optical images reveal a distinct stellar ring far outside the optical body with a diameter of ~30 kpc, which has...

Broad HI absorption in the candidate binary black-hole 4C37.11 (B2 0402+379) (2009)

Morganti, Raffaella, Emonts, Bjorn, Oosterloo, Tom

We report the discovery of extremely broad 21-cm HI absorption (FWZI ~1600 km/s) detected with the Westerbork Synthesis Radio Telescope in the radio source 4C37.11 (B2 0402+379). This object has been...

Broad HI absorption in the candidate binary black-hole 4C37.11 (B2 0402+379) (2009)

Emonts, Bjorn, Morganti, Raffaella, Oosterloo,Tom

The Hi absorption in 4C37.11 is unusual because it is the first case where such broad absorption is found to be centred on the systemic velocity of the host galaxy and not asymmetric and blueshifted...

Revealing Hanny's Voorwerp: radio observations of IC 2497 (2009)

Jozsa, Gyula I. G., Garrett, M. A., Oosterloo, Tom, Rampadarath, H., Paragi, Zsolt, Van Arkel, H., ...

We present multi-wavelength radio observations in the direction of the spiral galaxy IC 2497 and the neighbouring emission nebula known as "Hanny's Voorwerp". Our WSRT continuum observations at 1.4...

Revealing Hanny's Voorwerp: radio observations of IC 2497 (2009)

Jozsa, Gyula I. G., Garrett, M. A., Oosterloo, Tom, Rampadarath, H., Paragi, Zsolt, Van Arkel, H., ...

We present multi-wavelength radio observations in the direction of the spiral galaxy IC 2497 and the neighbouring emission nebula known as "Hanny's Voorwerp". Our WSRT continuum observations at 1.4...

Cold gas & mergers: fundamental difference in HI properties of different types of radio galaxies? (2008)

Emonts, Bjorn, Morganti, Raffaella, Oosterloo, Tom, Van Gorkom, Jacqueline

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 (compact, FR-I and...

Is NGC 3108 transforming itself from an early- to late-type galaxy: an astronomical hermaphrodite? (2008)

Hau, George K. T., Bower, Richard G., Kilborn, Virginia, Forbes, Duncan A., Balogh, Michael L., Oosterloo, Tom

A common feature of hierarchical galaxy formation models is the process of 'inverse' morphological transformation: a bulge dominated galaxy accretes a gas disc, dramatically reducing the system's...

Is NGC 3108 transforming itself from an early- to late-type galaxy: an astronomical hermaphrodite? (2008)

Hau, George K. T., Bower, Richard G., Kilborn, Virginia, Forbes, Duncan A., Balogh, Michael L., Oosterloo, Tom

A common feature of hierarchical galaxy formation models is the process of 'inverse' morphological transformation: a bulge dominated galaxy accretes a gas disc, dramatically reducing the system's...

Is NGC 3108 transforming itself from an early- to late-type galaxy: an astronomical hermaphrodite? (2008)

Hau, George K. T., Bower, Richard G., Kilborn, Virginia, Forbes, Duncan A., Balogh, Michael L., Oosterloo, Tom

A common feature of hierarchical galaxy formation models is the process of 'inverse' morphological transformation: a bulge dominated galaxy accretes a gas disc, dramatically reducing the system's...

The Local Group dwarf Leo T: H i on the brink of star formation (2008)

Ryan-Weber, Emma V., Begum, Ayesha, Oosterloo, Tom, Pal, Sabyasachi, Irwin, Michael J., Belokurov, Vasily, ...

We present Giant Meterwave Radio Telescope (GMRT) and Westerbork Synthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H i column density...

Is NGC 3108 transforming itself from an early- to late-type galaxy: an astronomical hermaphrodite? (2008)

Hau, George K. T., Bower, Richard G., Kilborn, Virginia, Forbes, Duncan A., Balogh, Michael L., Oosterloo, Tom

A common feature of hierarchical galaxy formation models is the process of 'inverse' morphological transformation: a bulge dominated galaxy accretes a gas disc, dramatically reducing the system's...

The Local Group dwarf Leo T: H i on the brink of star formation (2008)

Ryan-Weber, Emma V., Begum, Ayesha, Oosterloo, Tom, Pal, Sabyasachi, Irwin, Michael J., Belokurov, Vasily, ...

We present Giant Meterwave Radio Telescope (GMRT) and Westerbork Synthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H i column density...

Anomalous HI Gas in NGC 4395: Signs of Gas Accretion (2007)

Heald, George, Oosterloo, Tom

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 formation activity...

Tom Oosterloo (2007)

Australia Telescope, Tom Oosterloo

An adaptive filtering and masking technique of three-dimensional data sets, e.g. spectral data from a radio interferometer, based on wavelets and morphological filters is presented. Applications to...

Is NGC 3108 transforming itself from an early to late type galaxy -- an astronomical hermaphrodite? (2007)

Hau, George, Bower, Richard, Kilborn, Virginia, Forbes, Duncan, Balogh, Michael, Oosterloo, Tom

A common feature of hierarchical galaxy formation models is the process of "inverse" morphological transformation: a bulge dominated galaxy accretes a gas disk, dramatically reducing the system's...

The Local Group dwarf Leo T: HI on the brink of star formation (2007)

Ryan-Weber, Emma V., Begum, Ayesha, Oosterloo, Tom, Pal, Sabyasachi, Irwin, Michael J., Belokurov, Vasily, ...

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 HI column density is...

The cold gaseous halo of NGC 891 (2007)

Oosterloo, Tom, Fraternali, Filippo, Sancisi, Renzo

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 seen previously...

Gaseous Haloes: Linking Galaxies to the IGM (2007)

Fraternali, Filippo, Binney, James, Oosterloo, Tom, Sancisi, Renzo

In recent years evidence has accumulated that nearby spiral galaxies are surrounded by massive haloes of neutral and ionised gas. These gaseous haloes rotate more slowly than the disks and show...

Fast neutral outflows in nearby radio galaxies: a major source of feedback (2007)

Morganti, Raffaella, Tadhunter, Clive, Oosterloo, Tom, Holt, Joanna, Emonts, Bjorn

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 core that range...

The Westerbork SINGS Survey: I. Overview and Image Atlas (2006)

Braun, Robert, Oosterloo, Tom, Morganti, Raffaella, Klein, Uli, Beck, Rainer

We have obtained moderately deep radio continuum imaging at 18 and 22cm with the Westerbork array of 34 nearby galaxies drawn from the Spitzer SINGS and Starburst samples to enable complimentary...

Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited (2006)

Croft, Steve, Van Breugel, Wil, De Vries, Wim, Dopita, Mike, Martin, Chris, Morganti, Raffaella, ...

We present neutral hydrogen, ultraviolet, optical and near-infrared imaging, and optical spectroscopy, of Minkowski's Object (MO), a star forming peculiar galaxy near NGC 541. The observations...

A large HI cloud near the centre of the Virgo cluster (2005)

Oosterloo, Tom, Van Gorkom, Jacqueline

We report the discovery of a large HI cloud in the central regions of the Virgo cluster. It is 110 x 25 kpc in size and contains 3.4 x 10^8 Msol of HI. The morphology and kinematics of this cloud...

Letter to Nature: A dark jet dominates the power output of the stellar black hole Cygnus X-1 (2005)

Gallo, Elena, Fender, Rob, Kaiser, Christian, Russell, David, Morganti, Rafella, Oosterloo, Tom, ...

Black holes undergoing accretion are thought to emit the bulk of their power in the X-ray band by releasing the gravitational potential energy of the infalling matter1. At the same time, they are...

The extra-planar neutral gas in the edge-on spiral galaxy NGC 891 (2004)

Fraternali, Filippo, Oosterloo, Tom, Sancisi, Renzo, Swaters, Rob

We present neutral hydrogen observations of the nearby edge-on spiral galaxy NGC891 which show extended extra-planar emission up to distances of 15 kpc from the plane. 3D modeling of the galaxy shows...

Extra-planar HI in the starburst galaxy NGC 253 (2004)

Boomsma, Rense, Oosterloo, Tom, Fraternali, Filippo, Van Der Hulst, Thijs, Sancisi, Renzo

Observations of the nearby starburst galaxy NGC 253 in the 21-cm line reveal the presence of neutral hydrogen in the halo, up to 12 kpc from the galactic plane. This extra-planar HI is found only in...

High velocity HI in NGC 6946 and extra-planar gas in NGC 253 (2004)

Boomsma, Rense, Oosterloo, Tom, Fraternali, Filippo, Van Der Hulst, Thijs, Sancisi, Renzo

Multi-wavelength observations of nearby spiral galaxies have shown that neutral and ionized gas are present up to a few kpc from the disk and that star formation and supernovae probably play an...

Kinematics of the Ionised Gas in the Spiral Galaxy NGC 2403 (2004)

Fraternali, Filippo, Oosterloo, Tom, Sancisi, Renzo

We present a study of the kinematics of the ionised gas in the nearby spiral galaxy NGC 2403 using deep long-slit spectra obtained with the 4.2-m William Herschel Telescope. The data show the...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

The HIPASS catalogue - II. Completeness, reliability and parameter accuracy (2004)

Zwaan, Martin A., Meyer, Martin J., Webster, Rachel L., Staveley-Smith, Lister, Drinkwater, Michael J., Barnes, David G., ...

The HI Parkes All Sky Survey (HIPASS) is a blind extragalactic HI 21-cm emission-line survey covering the whole southern sky from declination -90° to +25°. The HIPASS catalogue (HICAT), containing...

Holes and high velocity HI in NGC 6946 (2003)

Boomsma, Rense, Oosterloo, Tom, Van Der Hulst, Thijs, Sancisi, Renzo, Fraternali, Filippo

We are studying the properties of the holes and the high velocity gas in NGC 6946. Here we present some puzzling results.

High Velocity Gas in the Halos of Spiral Galaxies (2003)

Fraternali, Filippo, Oosterloo, Tom, Boomsma, Rense, Swaters, Rob, Sancisi, Renzo

Recent, high sensitivity, HI observations of nearby spiral galaxies show that their thin `cold' disks are surrounded by thick layers (halos) of neutral gas with anomalous kinematics. We present...

HI on large and small scales in starburst radio galaxies (2003)

Morganti, Raffaella, Oosterloo, Tom, Tadhunter, Clive, Emonts, Bjorn, Van Moorsel, Gustaaf

The study of the optical continuum of radio galaxies shows that about 30% have a young stellar population component. Among them are the most far-IR bright radio galaxies. A further indication of the...

Diffuse X-ray emission from the spiral galaxy NGC 2403 discovered with Chandra (2002)

Fraternali, Filippo, Cappi, Massimo, Sancisi, Renzo, Oosterloo, Tom

We have detected diffuse soft X-ray emission (0.4-1 keV) from the disk of the spiral galaxy NGC 2403 with Chandra. This diffuse emission (with a total luminosity of 2.1 x 10^38 erg/s and a gas...

HI in elliptical galaxies (2002)

Sadler, Elaine M., Oosterloo, Tom, Morganti, Raffaella

Neutral hydrogen is an important component of the interstellar medium in elliptical galaxies as well as a potentially valuable mass tracer. Until recently, HI surveys of early-type galaxies have been...

Deep H I Survey of the Spiral Galaxy NGC 2403 (2002)

Fraternali, Filippo, Van Moorsel, Gustaaf, Sancisi, Renzo, Oosterloo, Tom

High sensitivity H I observations of the nearby spiral galaxy NGC 2403 obtained with the VLA are presented and discussed. The properties of the extended, differentially rotating H I layer with its H...

A new, kinematically anomalous HI component in the spiral galaxy NGC 2403 (2001)

Fraternali, Filippo, Oosterloo, Tom, Sancisi, Renzo, Van Moorsel, Gustaaf

We discuss new, high sensitivity HI observations of the spiral galaxy NGC2403 which show extended emission at anomalous velocities with respect to the `cold' disk. This `anomalous' gas component...

The H I Parkes all sky survey : southern observations, calibration and robust imaging (2001)

Barnes, David G., Haynes, Ray F., Staveley-Smith, Lister, De Blok, W.J., Oosterloo, Tom, Calabretta, M. R., ...

The acquisition of H i Parkes All Sky Survey (HIPASS) southern sky data commenced at the Australia Telescope National Facility's Parkes 64-m telescope in 1997 February, and was completed in 2000...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

The H I Parkes all sky survey : southern observations, calibration and robust imaging (2001)

Barnes, David G., Haynes, Ray F., Staveley-Smith, Lister, De Blok, W.J., Oosterloo, Tom, Calabretta, M. R., ...

The acquisition of H i Parkes All Sky Survey (HIPASS) southern sky data commenced at the Australia Telescope National Facility's Parkes 64-m telescope in 1997 February, and was completed in 2000...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

The H I Parkes all sky survey : southern observations, calibration and robust imaging (2001)

Barnes, David G., Haynes, Ray F., Staveley-Smith, Lister, De Blok, W.J., Oosterloo, Tom, Calabretta, M. R., ...

The acquisition of H i Parkes All Sky Survey (HIPASS) southern sky data commenced at the Australia Telescope National Facility's Parkes 64-m telescope in 1997 February, and was completed in 2000...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

The H I Parkes all sky survey : southern observations, calibration and robust imaging (2001)

Barnes, David G., Haynes, Ray F., Staveley-Smith, Lister, De Blok, W.J., Oosterloo, Tom, Calabretta, M. R., ...

The acquisition of H i Parkes All Sky Survey (HIPASS) southern sky data commenced at the Australia Telescope National Facility's Parkes 64-m telescope in 1997 February, and was completed in 2000...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

HIPASS detection of an intergalactic gas cloud in the NGC 2442 group (2001)

Ryder, Stuart D., Koribalski, Baerbel S., Staveley-Smith, Lister, Kilborn, Virginia A., Malin, David F., Banks, Gareth D., ...

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar...

The H I Parkes all sky survey : southern observations, calibration and robust imaging (2001)

Barnes, David G., Haynes, Ray F., Staveley-Smith, Lister, De Blok, W.J., Oosterloo, Tom, Calabretta, M. R., ...

The acquisition of H i Parkes All Sky Survey (HIPASS) southern sky data commenced at the Australia Telescope National Facility's Parkes 64-m telescope in 1997 February, and was completed in 2000...

The vertical structure and kinematics of HI in spiral galaxies (2000)

Sancisi, Renzo, Fraternali, Filippo, Oosterloo, Tom, Van Moorsel, Gustaaf

We discuss the distribution and kinematics of neutral hydrogen in the halos of spiral galaxies. We focus in particular on new results obtained for the nearby Sc galaxy NGC 2403 which have revealed...

The HI halo of NGC 2403 (2000)

Fraternali, Filippo, Oosterloo, Tom, Sancisi, Renzo, Van Moorsel, Gustaaf

Deep VLA HI observations of the nearby spiral galaxy NGC 2403 reveal the presence of an extended HI halo that shows slower rotation and a general inflow (about 15-25 km\s) towards the center of the...

The HI halos of spiral galaxies (2000)

Sancisi, Renzo, Fraternali, Filippo, Oosterloo, Tom, Van Moorsel, Gustaaf

The results of observational studies on the vertical HI density distribution and kinematics of the disks of spiral galaxies are reported and discussed. Attention is drawn to the presence of HI...

Morphology and kinematics of HI in dust-lane elliptical galaxies (1998)

Morganti, Raffaella, Oosterloo, Tom, Sadler, Elaine, Vergani, Daniela

We present the results of the HI observations of four dust-lane ellipticals. The HI detected is regularly distributed in disks or rings. Moreover, in three of the four objects we have detected a very...

HI in Low-Luminosity Early-Type Galaxies (1998)

Oosterloo, Tom, Morganti, Raffaella, Sadler, Elaine

We discuss the properties of the HI in low-luminosity early-type galaxies. The morphology of the HI is more regular than that of the HI in many more-luminous early-type galaxies. The HI is always...