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An optical and HI study of the dwarf Local Group galaxy VV124=UGC4879. A gas-poor dwarf with a stellar disk?
M. Bellazzini, G. Beccari, T. A. Oosterloo +8
We present a detailed study of the dwarf galaxy VV124, recently recognized as a isolated member of the Local Group. We have obtained deep (r=26.5) wide-field g,r photometry of indi…
Radio observations of candidate magnetic O stars
R. S. Schnerr, K. L. J. Rygl, A. J. van der Horst +5
Context: Some O stars are suspected to have to have (weak) magnetic fields because of the observed cyclical variability in their UV wind-lines. However, direct detections of these…
The Atlas3D project -- I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria
Michele Cappellari, Eric Emsellem, Davor Krajnovic +23
The Atlas3D project is a multi-wavelength survey combined with a theoretical modeling effort. The observations span from the radio to the millimeter and optical, and provide multi-…
The Westerbork Hydrogen Accretion in Local Galaxies (HALOGAS) Survey I. Survey Description and Pilot Observations
George Heald, Gyula Jozsa, Paolo Serra +7
We introduce a new, very deep neutral hydrogen (HI) survey being performed with the Westerbork Synthesis Radio Telescope (WSRT). The Westerbork Hydrogen Accretion in LOcal GAlaxieS…
Detailed Radio View on Two Stellar Explosions and Their Host Galaxy: XRF080109/SN2008D and SN2007uy in NGC2770
A. J. van der Horst, A. P. Kamble, Z. Paragi +16
The galaxy NGC2770 hosted two core-collapse supernova explosions, SN2008D and SN2007uy, within 10 days of each other and 9 years after the first supernova of the same type, SN1999e…
Cold gas in massive early-type galaxies: The case of NGC 1167
C. Struve, T. A. Oosterloo, R. Sancisi +2
We present a study of the morphology and kinematics of the neutral hydrogen in the gas-rich (M_HI=1.5x10^{10}Msun), massive early-type galaxy NGC 1167, which was observed with the…
The latest on Apertif
Tom Oosterloo, Marc Verheijen, Wim van Cappellen
We describe a Phased Array Feed (PAF) system, called Apertif, which will be installed in the Westerbork Synthesis Radio Telescope (WSRT). The aim of Apertif is, at frequencies from…
Early-type galaxies in different environments: an HI view
Tom Oosterloo, Raffaella Morganti, Alison Crocker +8
We present an analysis of deep WSRT observations of the HI in 33 nearby early-type galaxies selected from a sample studied earlier at optical wavelengths with the SAURON integral-f…
A collisional origin for the Leo ring
Leo Michel-Dansac, Pierre-Alain Duc, Frederic Bournaud +6
Extended HI structures around galaxies are of prime importance to probe galaxy formation scenarios. The giant HI ring in the Leo group is one of the largest and most intriguing HI…
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…
Hanny's Voorwerp: Evidence of AGN activity and a nuclear starburst in the central regions of IC 2497
H. Rampadarath, M. A. Garrett, G. I. G. Józsa +7
We present high- and intermediate resolution radio observations of the central region in the spiral galaxy IC 2497, performed using the European VLBI Network (EVN) at 18 cm, and th…
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…
Centaurus A: morphology and kinematics of the atomic hydrogen
C. Struve, T. A. Oosterloo, R. Morganti +1
We present new ATCA 21-cm line observations of the neutral hydrogen in the nearby radio galaxy Centaurus A. We image in detail (with a resolution down to 7", ~100pc) the distributi…
Large-scale HI in nearby radio galaxies (II): the nature of classical low-power radio sources
B. H. C. Emonts, R. Morganti, C. Struve +7
An important aspect of solving the long-standing question as to what triggers various types of Active Galactic Nuclei involves a thorough understanding of the overall properties an…
Cold and Warm Gas Outflows in Radio AGN
Raffaella Morganti, Joanna Holt, Clive Tadhunter +1
The study of the conditions and the kinematics of the gas in the central region of AGN provides important information on the relevance of feedback effects connected to the nuclear…