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New evidence for halo gas accretion onto disk galaxies
Filippo Fraternali
Studies of the halo gas in the Milky Way and in nearby spiral galaxies show the presence of gas complexes that cannot be reconciled with an internal (galactic fountain) origin and…
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…
Ultra-High Energy Cosmic Rays, Spiral galaxies and Magnetars
G. Ghisellini, G. Ghirlanda, F. Tavecchio +2
We measure the correlation between the arrival directions of the highest energy cosmic rays detected by the Pierre Auger Observatory with the position of the galaxies in the HI Par…
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…
Accretion of gas onto nearby spiral galaxies
Filippo Fraternali, James Binney
We present evidence for cosmological gas accretion onto spiral galaxies in the local universe. The accretion is seen through its effects on the dynamics of the extra-planar neutral…
The Bright and the Dark Side of Malin 1
Renzo Sancisi, Filippo Fraternali
Malin 1 has long been considered a prototype giant, dark matter dominated Low Surface Brightness galaxy. Two recent studies, one based on a re-analysis of VLA HI observations and t…
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…
Gaseous Haloes: Linking Galaxies to the IGM
Filippo Fraternali, James Binney, Tom Oosterloo +1
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 d…
A Dynamical Model for the Extra-planar Gas in Spiral Galaxies
Filippo Fraternali, James Binney
Recent HI observations reveal that the discs of spiral galaxies are surrounded by extended gaseous haloes. This extra-planar gas reaches large distances (several kpc) from the disc…
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.…
Hydrostatic models for the rotation of extra-planar gas in disk galaxies
M. Barnabè, L. Ciotti, F. Fraternali +1
We show that fluid stationary models are able to reproduce the observed, negative vertical gradient of the rotation velocity of the extra-planar gas in spiral galaxies. We have con…
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,…
The extra-planar neutral gas in the edge-on spiral galaxy NGC 891
Filippo Fraternali, Tom Oosterloo, Renzo Sancisi +1
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…
Extra-planar HI in the starburst galaxy NGC 253
Rense Boomsma, Tom Oosterloo, Filippo Fraternali +2
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 H…
High velocity HI in NGC 6946 and extra-planar gas in NGC 253
Rense Boomsma, Tom Oosterloo, Filippo Fraternali +2
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 pro…
Stationary fluid models for the extra-planar gas in spiral galaxies
M. Barnabe', L. Ciotti, F. Fraternali +1
We show how to construct families of stationary hydrodynamical configurations that reproduce the observed vertical gradient of the rotation velocity of the extra-planar gas in spir…
Kinematics of the Ionised Gas in the Spiral Galaxy NGC 2403
Filippo Fraternali, Tom Oosterloo, Renzo Sancisi
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 da…
Holes and high velocity HI in NGC 6946
Rense Boomsma, Tom Oosterloo, Thijs van der Hulst +2
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
Filippo Fraternali, Tom Oosterloo, Rense Boomsma +2
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 kinematic…
The line-of-sight warp of the spiral galaxy ESO 123-G23
G. Gentile, F. Fraternali, U. Klein +1
We present 3-D modelling of the distribution and kinematics of the neutral hydrogen in the spiral galaxy ESO 123-G23. The optical appearance of this galaxy is an almost perfectly e…
Diffuse X-ray emission from the spiral galaxy NGC 2403 discovered with Chandra
Filippo Fraternali, Massimo Cappi, Renzo Sancisi +1
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…
Deep H I Survey of the Spiral Galaxy NGC 2403
Filippo Fraternali, Gustaaf van Moorsel, Renzo Sancisi +1
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…
A new, kinematically anomalous HI component in the spiral galaxy NGC 2403
Filippo Fraternali, Tom Oosterloo, Renzo Sancisi +1
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'…
The vertical structure and kinematics of HI in spiral galaxies
Renzo Sancisi, Filippo Fraternali, Tom Oosterloo +1
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 whi…