Publications (76)
Distribution and kinematics of atomic and molecular gas inside the Solar circle
A. Marasco, F. Fraternali, J. M. van der Hulst +1
The detailed distribution and kinematics of the atomic and the CO-bright molecular hydrogen in the disc of the Milky Way inside the Solar circle are derived under the assumptions o…
Investigating the merger origin of Early-Type Galaxies using ultra-deep optical images
P. -A. Duc, J. -C. Cuillandre, K. Alatalo +28
The mass assembly of galaxies leaves various imprints on their surroundings, such as shells, streams and tidal tails. The frequency and properties of these fine structures depend o…
Probing the gas content of radio galaxies through HI absorption stacking
K. Gereb, R. Morganti, T. Oosterloo
Using the WSRT, we carried out shallow HI absorption observations of a flux-selected (S > 50 mJy) sample of 93 radio AGN with available SDSS redshifts between 0.02 < z < 0.23. We s…
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…
Large-scale HI structures and the origin of radio galaxies
R. Morganti, T. Oosterloo, C. Tadhunter +1
We present the first results of a study aimed to detect large HI structures in radio galaxies. In two of the three cases presented (Coma A and B2 0648+27), the detection of a large…
AGN-host interaction in IC 5063. I. Large-scale X-ray morphology and spectral analysis
A. Travascio, G. Fabbiano, A. Paggi +5
We report the analysis of the deep (270 ks) X-ray Chandra data of one of the most radio-loud, Seyfert 2 galaxies in the nearby Universe (z=0.01135), IC 5063. The alignment of the r…
HALOGAS: Strong Constraints on the Neutral Gas Reservoir and Accretion Rate in Nearby Spiral Galaxies
P. Kamphuis, E. Jütte, G. H. Heald +11
Galaxies in the local Universe are thought to require ongoing replenishment of their gas reservoir in order to maintain the observed star formation rates. Cosmological simulations…
The gaseous haloes of disc galaxies
F. Fraternali, T. Oosterloo, J. J. Binney +1
The study of gas outside the plane of disc galaxies is crucial to understanding the circulation of material within a galaxy and between galaxies and the intergalactic environment.…
A very brief description of LOFAR - the Low Frequency Array
H. Falcke, M. P. van Haarlem, A. G. de Bruyn +28
LOFAR (Low Frequency Array) is an innovative radio telescope optimized for the frequency range 30-240 MHz. The telescope is realized as a phased aperture array without any moving p…
Emission line outflows in PKS1549-79: the effects of the early stages of radio source evolution?
C. Tadhunter, K. Wills, R. Morganti +2
We present new spectroscopic observations of the southern radio galaxy PKS1549-79 (z =0.152).Despite the flat spectrum character of the radio emission from this source, our optical…
A GBT Survey of the HALOGAS Galaxies and Their Environments I: Revealing the full extent of HI around NGC891, NGC925, NGC4414 & NGC4565
N. M. Pingel, D. J. Pisano, G. Heald +7
We present initial results from a deep neutral hydrogen (HI) survey of the HALOGAS galaxy sample, which includes the spiral galaxies NGC891, NGC925, NGC4414, and NGC4565, performed…
The impact of the early stages of radio source evolution on the ISM of the host galaxies
R. Morganti, C. Tadhunter, T. Oosterloo +3
The study of both neutral and ionized gas in young radio sources is providing key information on the effect the radio plasma has on the ISM of these objects. We present results obt…
Jet acceleration of the fast molecular outflows in the Seyfert galaxy IC5063
C. Tadhunter, R. Morganti, M. Rose +2
Massive outflows driven by active galactic nuclei (AGN) are widely recognised to play a key role in the evolution of galaxies, heating the ambient gas, expelling it from the nuclea…
HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group
S. D. Ryder, B. Koribalski, L. Staveley-Smith +26
We report the discovery, from the HI Parkes All-Sky Survey (HIPASS), of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69,…
An Extragalactic HI Cloud with No Optical Counterpart?
V. A. Kilborn, L. Staveley-Smith, M. Marquarding +25
We report the discovery, from the HI Parkes All-Sky Survey (HIPASS), of an isolated cloud of neutral hydrogen which we believe to be extragalactic. The HI mass of the cloud (HIPASS…
A low HI column density filament in NGC 2403: signature of interaction or accretion
W. J. G. de Blok, Katie M. Keating, D. J. Pisano +6
Observed HI accretion around nearby galaxies can only account for a fraction of the gas supply needed to sustain the currently observed star formation rates. It is possible that ad…
Molecular Gas and Star Formation in Local Early-Type Galaxies
M. Bureau, T. A. Davis, K. Alatalo +23
The molecular gas content of local early-type galaxies is constrained and discussed in relation to their evolution. First, as part of the Atlas3D survey, we present the first compl…
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…
HI in four star-forming low-luminosity E/S0 and S0 galaxies
E. Sadler, T. Oosterloo, R. Morganti
We present HI data cubes of four low-luminosity early-type galaxies which are currently forming stars. These galaxies have absolute magnitudes in the range M_B=-17.9 to -19.9 (H_o=…
Fueling the central engine of radio galaxies. II. The footprints of AGN feedback on the ISM of 3C 236
A. Labiano, S. Garcia-Burillo, F. Combes +7
Aims: We study the emission of molecular gas in 3C236, a FR II radio source at z~0.1, and search for the footprints of AGN feedback. 3C236 shows signs of a reactivation of its AGN…
Revealing HI gas in emission and absorption on pc to kpc scales in a galaxy at z ~ 0.017
N. Gupta, R. Srianand, J. S. Farnes +6
We present a detailed study of the quasar-galaxy pair: J1243+4043 - UGC07904. The sight line of the background quasar ( = 1.5266) passes through a region of the galaxy (=…
An ALMA CO(1-0) survey of the 2Jy sample: large and massive molecular disks in radio AGN host galaxies
C. Tadhunter, T. Oosterloo, R. Morganti +4
The jets of radio AGN provide one of the most important forms of AGN feedback, yet considerable uncertainties remain about how they are triggered. Since the molecular gas reservoir…
Formation of slowly rotating early-type galaxies via major mergers: a Resolution Study
M. Bois, F. Bournaud, E. Emsellem +21
We study resolution effects in numerical simulations of gas-rich and gas-poor major mergers, and show that the formation of slowly-rotating elliptical galaxies often requires a res…
HI gas disks in elliptical galaxies
E. M. Sadler, T. Oosterloo, R. Morganti
We discuss a class of low-luminosity E/S0 galaxies which have both HI disks and (in contrast to more luminous E/S0s with HI) ongoing star formation. We suggest that such objects ar…
Apercal -- The Apertif Calibration Pipeline
B. Adebahr, R. Schulz, T. J. Dijkema +33
Apertif (APERture Tile In Focus) is one of the Square Kilometre Array (SKA) pathfinder facilities. The Apertif project is an upgrade to the 50-year-old Westerbork Synthesis Radio T…
The MeerKAT Absorption Line Survey (MALS)
N. Gupta, R. Srianand, W. Baan +41
Deep galaxy surveys have revealed that the global star formation rate (SFR) density in the Universe peaks at 1 < z < 2 and sharply declines towards z = 0. But a clear picture of th…
Cold gas and the disruptive effect of a young radio jet
R. Morganti, T. Oosterloo, F. M. Maccagni +3
Newly born and young radio sources are in a delicate phase of their life. Their jets are fighting their way through the surrounding gaseous medium, strongly experiencing this inter…
HI within and around observed and simulated galaxy discs -- Comparing MeerKAT observations with mock data from TNG50 and FIRE-2
A. Marasco, W. J. G. de Blok, F. M. Maccagni +12
Atomic hydrogen (HI) is an ideal tracer of gas flows in and around galaxies, and it is uniquely observable in the nearby Universe. Here we make use of wide-field (~1 square degree)…
Dwarfs walking in a row. The filamentary nature of the NGC3109 association
M. Bellazzini, T. Oosterloo, F. Fraternali +1
We re-consider the association of dwarf galaxies around NGC3109, whose known members were NGC3109, Antlia, Sextans A and Sextans B, based on a new updated list of nearby galaxies a…
The radio structures of southern 2-Jy radio sources: new ATCA and VLA radio images
R. Morganti, T. Oosterloo, C. N. Tadhunter +3
We present new radio images obtained with the Australia Telescope Compact Array (ATCA) and the Very Large Array (VLA) for a group of 14 galaxies belonging to the 2-Jy sample of rad…
HI in Early-Type Galaxies
T. Oosterloo, R. Morganti, E. M. Sadler
We summarize the HI properties of early-type galaxies, in particular the differences in HI morphologies observed in early-type galaxies of different luminosities. We find that in l…
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…
A dark jet dominates the power output of the stellar black hole Cygnus X-1
E. Gallo, R. Fender, C. Kaiser +4
Accreting black holes are thought to emit the bulk of their power in the X-ray band by releasing the gravitational potential energy of the infalling matter. At the same time, they…
The parsec-scale HI outflows in powerful radio galaxies
R. Schulz, R. Morganti, K. Nyland +3
Massive outflows of neutral atomic hydrogen (HI) have been observed in absorption in a number of radio galaxies and are considered a signature of AGN feedback. These outflows on kp…
HI in Early-Type Galaxies
T. Oosterloo, R. Morganti, E. M. Sadler
We briefly discuss the main differences between the HI properties of luminous and low-luminosity early-type galaxies. In luminous early-type galaxies the HI is often irregularly di…
The 1000 Brightest HIPASS Galaxies: HI Mass Function and Omega_HI
M. A. Zwaan, L. Staveley-Smith, B. S. Koribalski +37
We present a new accurate measurement of the HI mass function of galaxies from the HIPASS Bright Galaxy Catalog, a sample of 1000 galaxies with the highest HI peak flux densities i…
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…
HI study of the warped spiral galaxy NGC5055: a disk/dark matter halo offset?
G. Battaglia, F. Fraternali, T. Oosterloo +1
We present a study of the HI distribution and dynamics of the nearby spiral galaxy NGC5055 based on observations with the Westerbork Synthesis Radio Telescope. The gaseous disk of…
The jet-ISM interaction in the Outer Filament of Centaurus A
F. Santoro, J. B. R. Oonk, R. Morganti +1
The interaction between the radio plasma ejected by the active nucleus of a galaxy and the surrounding medium is a key process that can have a strong impact on the interstellar med…
The disruption of nearby galaxies by the Milky Way
M. E. Putman, B. K. Gibson, L. Staveley-Smith +23
Interactions between galaxies are common and are an important factor in determining their physical properties such as position along the Hubble sequence and star-formation rate. Th…
A Radio Study of the Seyfert Galaxy IC 5063: Evidence for Fast Gas Outflow
R. Morganti, T. Oosterloo, Z. Tsvetanov
New radio continuum (8 GHz and 1.4 GHz) and HI 21 cm line observations of the Seyfert 2 galaxy IC 5063 (PKS 2048-572) were obtained with the Australia Telescope Compact Array (ATCA…
Outflows of neutral (and ionized) gas in radio galaxies
R. Morganti, T. Oosterloo, C. Tadhunter
Outflows up to 1500 km/s of atomic neutral hydrogen are detected in a growing number of radio galaxies. Outflows with similar velocities are also detected in ionized gas, suggestin…
Herschel observations of Cen A: stellar heating of two extragalactic dust clouds
R. Auld, M. W. L. Smith, G. Bendo +18
We present the first results of a multi-wavelength survey, incoporating Herschel-SPIRE, Spitzer, GALEX and ATCA observations, of a 1 deg x 1 deg field centred on Centaurus A. As we…
Outflowing shocked gas dominates the NIR H emission from the dual AGN NGC6240
J. Carlsen, C. Cicone, B. Hagedorn +10
[Abridged] We present a multi-line study of the kinematics of the molecular and ionised gas phases in the central 2 kpc of NGC6240, based on JWST/NIRSpec and ALMA observations. We…
Early Observations of the MHONGOOSE Galaxies: Getting Ready for MeerKAT
A. Sorgho, C. Carignan, D. J. Pisano +9
We present early observations of 20 galaxies in the MHONGOOSE survey galaxies using KAT-7, the GBT, and MeerKAT. We present the best calibrators for five of the MHONGOOSE galaxies…
Quenching of Star Formation in Molecular Outflow Host NGC 1266
K. Alatalo, K. E. Nyland, G. Graves +23
We detail the rich molecular story of NGC 1266, its serendipitous discovery within the ATLAS3D survey (Cappellari et al. 2011) and how it plays host to an AGN-driven molecular outf…
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…
Neutral and ionized gas distribution in and around the radio galaxy Coma A
R. Morganti, T. Oosterloo, C. N. Tadhunter +1
HI absorption has been detected with the WSRT against both lobes of the radio galaxy Coma A. This radio galaxy could be expanding in a particularly gas rich environment, perhaps th…
The ATLAS project - XXV: Two-dimensional kinematic analysis of simulated galaxies and the cosmological origin of fast and slow rotators
T. Naab, L. Oser, E. Emsellem +26
We present a detailed two-dimensional stellar dynamical analysis of a sample of 44 cosmological hydrodynamical simulations of individual central galaxies and their satellites. Kine…
The HIPASS Catalogue: III - Optical Counterparts & Isolated Dark Galaxies
Marianne T. Doyle, M. J. Drinkwater, D. J. Rohde +38
We present the largest catalogue to date of optical counterparts for HI radio-selected galaxies, Hopcat. Of the 4315 HI radio-detected sources from the HI Parkes All Sky Survey (Hi…
Gas outflows in radio galaxies
R. Morganti, T. Oosterloo, B. H. C. Emonts +2
We present a summary of our recent results on gas outflows in radio galaxies. Fast outflows (up to 2000 km/s) have been detected both in ionized and neutral gas. The latter is part…
Bars in dark matter-dominated dwarf galaxy discs
A. Marasco, K. A. Oman, J. F. Navarro +2
We study the shape and kinematics of simulated dwarf galaxy discs in the APOSTLE suite of CDM cosmological hydrodynamical simulations. We find that a large fraction of these ga…
The Hot and Cold Outflows of NGC 3079
N. Shafi, R. Morganti, T. Oosterloo +1
Very deep neutral hydrogen (HI) observations of the edge-on spiral galaxy NGC 3079 with the Westerbork Synthesis Radio Telescope (WSRT) are presented. The galaxy has been studied e…
Chandra X-ray Observatory study of the X-ray emission of PKS 0023-26 and comparison with recent ALMA results
A. Siemiginowska, R. Morganti, G. Fabbiano +4
We present a deep high-resolution Chandra X-ray Observatory image data of a powerful compact radio source PKS 0023-26 associated with a quasar at redshift 0.322. The earlier studie…
LOFAR discovery and wide-band characterisation of an ultra-steep spectrum AGN radio remnant associated with Abell 1318
A. Shulevski, M. Brienza, F. Massaro +15
We present the discovery of a very extended (550 kpc) and low-surface-brightness ( at 144 MHz) radio emission region in Abell 1318. These proper…
The Atlas3D project -- XXVII. Cold Gas and the Colours and Ages of Early-type Galaxies
L. M. Young, N. Scott, P. Serra +22
We present a study of the cold gas contents of the Atlas3D early-type galaxies, in the context of their optical colours, near-UV colours, and Hβ absorption line strengths. Early-t…
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…
Extra-planar gas in the spiral galaxy NGC 4559
C. V. Barbieri, F. Fraternali, T. Oosterloo +3
We present 21-cm line observations of the spiral galaxy NGC 4559, made with the Westerbork Synthesis Radio Telescope. We have used them to study the HI distribution and kinematics,…
From star-forming galaxies to AGN: the global HI content from a stacking experiment
K. Gereb, R. Morganti, T. Oosterloo +2
We study the atomic neutral hydrogen (HI) content of 1600 galaxies up to using stacking techniques. The observations were carried out with the Westerbork Synthes…
Deep Herschel observations of the 2Jy sample: assessing the non-thermal and AGN contributions to the far-IR continuum
D. Dicken, C. N. Tadhunter, N. P. H. Nesvadba +5
The far-IR/sub-mm wavelength range contains a wealth of diagnostic information that is important for understanding the role of radio AGN in galaxy evolution. Here we present the re…
PKS 1814-637: a powerful radio-loud AGN in a disk galaxy
R. Morganti, J. Holt, C. Tadhunter +5
We present a detailed study of PKS1814-637, a rare case of powerful radio source (P_5 GHz = 4.1 x 10^25 W/Hz) hosted by a disk galaxy. Optical images have been used to model the ho…
HALOGAS: the properties of extraplanar HI in disc galaxies
A. Marasco, F. Fraternali, G. Heald +9
We present a systematic study of the extraplanar gas (EPG) in a sample of 15 nearby late-type galaxies at intermediate inclinations using publicly available, deep interferometric H…
VEGAS: VST Early-type GAlaxy Survey. V. IC 1459 group: Mass assembly history in low density environments
E. Iodice, M. Spavone, A. Cattapan +9
This paper is based on the multi-band VST Early-type GAlaxy Survey (VEGAS) with the VLT Survey Telescope (VST). We present new deep photometry of the IC1459 group in g and r band.…
Neutral hydrogen gas within and around NGC 1316
P. Serra, F. M. Maccagni, D. Kleiner +20
We present MeerKAT observations of neutral hydrogen gas (HI) in the nearby merger remnant NGC 1316 (Fornax A), the brightest member of a galaxy group which is falling into the Forn…
Detection of the H92alpha recombination line from NGC 4945
A. L. Roy, T. Oosterloo, W. M. Goss +1
Context. Hydrogen ionized by young, high-mass stars in starburst galaxies radiates radio recombination lines (RRLs), whose strength can be used as a diagnostic of the ionization ra…
New Galaxies Discovered in the First Blind HI Survey of the Centaurus A Group
G. D. Banks, M. J. Disney, P. M. Knezek +26
We have commenced a 21-cm survey of the entire southern sky (δ< 0 degrees, -1200 km/s < v < 12700 km/s) which is ''blind'', i.e. unbiased by previous optical information. In the p…
The angular momentum of disc galaxies at z=1
A. Marasco, F. Fraternali, L. Posti +3
We investigate the relation between stellar mass and specific stellar angular momentum, or `Fall relation', for a sample of 17 isolated, regularly rotating disc galaxies at z=1. Al…
ALMA reveals optically thin, highly excited CO gas in the jet-driven winds of the galaxy IC5063
K. M. Dasyra, F. Combes, T. Oosterloo +4
Using CO (4-3) and (2-1) Atacama Large Millimeter Array (ALMA) data, we prove that the molecular gas in the jet-driven winds of the galaxy IC5063 is more highly excited than the re…
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…
Radio Recombination Lines from Starbursts: NGC 3256, NGC 4945 and the Circinus Galaxy
A. L. Roy, W. M. Goss, Niruj R. Mohan +2
A renewed attempt to detect radio recombination lines from external galaxies has resulted in the measurement of lines from several bright starburst galaxies. The lines are produced…
Gas and stars in compact (young) radio sources
R. Morganti, B. Emonts, J. Holt +3
Gas can be used to trace the formation and evolution of galaxies as well as the impact that the nuclear activity has on the surrounding medium. For nearby compact radio sources, we…
Mapping the neutral atomic hydrogen gas outflow in the restarted radio galaxy 3C 236
R. Schulz, R. Morganti, K. Nyland +3
The energetic feedback that is generated by radio jets in active galactic nuclei (AGNs) has been suggested to be able to produce fast outflows of atomic hydrogen (HI) gas that can…
HALOGAS: Extraplanar gas in NGC 3198
G. Gentile, G. I. G. Jozsa, P. Serra +6
We present the analysis of new, deep HI observations of the spiral galaxy NGC 3198, as part of the HALOGAS (Westerbork Hydrogen Accretion in LOcal GAlaxieS) survey, with the main a…
AGN Feedback Driven Molecular Outflow in NGC 1266
K. Alatalo, K. E. Nyland, G. Graves +25
NGC 1266 is a nearby field galaxy observed as part of the ATLAS3D survey (Cappellari et al. 2011). NGC 1266 has been shown to host a compact (< 200 pc) molecular disk and a mass-lo…
Tidal Remnants and Intergalactic HII Regions
T. Oosterloo, R. Morganti, E. M. Sadler +3
We report the discovery of two small intergalactic HII regions in the loose group of galaxies around the field elliptical NGC 1490. The HII regions are located at least 100 kpc fro…
LOFAR - Opening up a new window on the Universe
H. J. A. Rottgering, R. Braun, P. D. Barthel +31
LOFAR, the Low Frequency Array, is a next-generation radio telescope that is being built in Northern Europe and expected to be fully operational at the end of this decade. It will…