Dynamics of the Magnetoviscous Instability

The Astrophysical Journal American Astronomical Society 633:1 (2005) 328-333

Authors:

Tanim Islam, Steven Balbus

The gaseous haloes of disc galaxies

ArXiv astro-ph/0510734 (2005)

Authors:

F Fraternali, T Oosterloo, JJ Binney, R Sancisi

Abstract:

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. We present new HI observations of the edge-on galaxy NGC891, which show an extended halo component lagging behind the disc in rotation. We compare these results for NGC891 with other detections of gaseous haloes. Finally, we present a dynamical model for the formation of extra-planar gas.

Planet formation and migration

(2005)

Authors:

John CB Papaloizou, Caroline Terquem

The central kinematics of NGC 1399 measured with 14pc resolution

(2005)

Authors:

RCW Houghton, J Magorrian, M Sarzi, N Thatte, RL Davies, D Krajnovic

Integral field spectroscopy of 23 spiral bulges

Astrophysical Journal Supplement Series 160:1 (2005) 76-86

Authors:

D Batcheldor, D Axon, D Merritt, MA Hughes, A Marconi, J Binney, A Capetti, M Merrifield, C Scarlata, W Sparks

Abstract:

We have obtained integral-field spectroscopy for 23 spiral bulges using INTEGRAL on the William Herschel Telescope and SPIRAL on the Anglo-Australian Telescope. This is the first two-dimensional survey directed solely at the bulges of spiral galaxies. Eleven galaxies of the sample do not have previous measurements of the stellar velocity dispersion (σ*). These data are designed to complement our Space Telescope Imaging Spectrograph program for estimating black hole masses in the range 106-108 M using gas kinematics from nucleated disks. These observations will serve to derive the stellar dynamical bulge properties using the traditional Mg b and Ca II triplets. We use both cross-correlation and maximum penalized likelihood to determine projected σ* in these systems and present radial velocity fields, major axis rotation curves, curves of growth, and σ* fields. Using cross-correlation to extract the low-order two-dimensional stellar dynamics we generally see coherent radial rotation and irregular velocity dispersion fields suggesting that is a nontrivial parameter to estimate. © 2005, The American Astronomical Society. All rights reserved.