TY - JOUR
T1 - Morphology and kinematics of the ionised gas in early-type galaxies
AU - Falcón-Barroso, Jesús
AU - Sarzi, Marc
AU - Bacon, Roland
AU - Bureau, Martin
AU - Cappellari, Michele
AU - Davies, Roger L.
AU - Emsellem, Eric
AU - Fathi, Kambiz
AU - Krajnović, Davor
AU - Kuntschner, Harald
AU - McDermid, Richard M.
AU - Peletier, Reynier F.
AU - de Zeeuw, Tim
PY - 2006/1
Y1 - 2006/1
N2 - We present results of our ongoing study of the morphology and kinematics of the ionised gas in 48 representative nearby elliptical and lenticular galaxies using the SAURON integral-field spectrograph on the 4.2m William Herschel Telescope. Making use of a recently developed technique, emission is detected in 75% of the galaxies. The ionised-gas distributions display varied morphologies, ranging from regular gas disks to filamentary structures. Additionally, the emission-line kinematic maps show, in general, regular motions with smooth variations in kinematic position angle. In most of the galaxies, the ionised-gas kinematics is decoupled from the stellar counterpart, but only some of them present signatures of recent accretion of gaseous material. The presence of dust is very common in our sample and is usually accompanied by gas emission. Our analysis of the [OIII]/Hβ emission-line ratios, both across the whole sample as well as within the individual galaxies, suggests that there is no unique mechanism triggering the ionisation of the gas.
AB - We present results of our ongoing study of the morphology and kinematics of the ionised gas in 48 representative nearby elliptical and lenticular galaxies using the SAURON integral-field spectrograph on the 4.2m William Herschel Telescope. Making use of a recently developed technique, emission is detected in 75% of the galaxies. The ionised-gas distributions display varied morphologies, ranging from regular gas disks to filamentary structures. Additionally, the emission-line kinematic maps show, in general, regular motions with smooth variations in kinematic position angle. In most of the galaxies, the ionised-gas kinematics is decoupled from the stellar counterpart, but only some of them present signatures of recent accretion of gaseous material. The presence of dust is very common in our sample and is usually accompanied by gas emission. Our analysis of the [OIII]/Hβ emission-line ratios, both across the whole sample as well as within the individual galaxies, suggests that there is no unique mechanism triggering the ionisation of the gas.
KW - cD
KW - Galaxies: elliptical and lenticular
KW - Galaxies: individual (NGC 2768, NGC 2974, NGC 4278, NGC 4526)
KW - Galaxies: ISM
KW - Galaxies: kinematics and dynamics
UR - http://www.scopus.com/inward/record.url?scp=30444453125&partnerID=8YFLogxK
U2 - 10.1016/j.newar.2005.10.006
DO - 10.1016/j.newar.2005.10.006
M3 - Review article
AN - SCOPUS:30444453125
SN - 1387-6473
VL - 49
SP - 515
EP - 520
JO - New Astronomy Reviews
JF - New Astronomy Reviews
IS - 10-12
ER -