Central UV spikes in two galactic spheroids
Formation of Galactic Bulges Cambridge University Press (2000) 191-194
Abstract:
FOS spectra and FOC photometry of two centrally located, UV-bright spikes in the elliptical galaxy NGC 4552 and the bulge-dominated early spiral NGC 2681, are presented. These spectra reveal that such point-like UV sources detected by means of HST within a relatively large fraction ~15% of bulges can be related to radically different phenomena. While the UV unresolved emission in NGC 4552 represents a transient event likely induced by an accretion event onto a supermassive black hole, the spike seen at the center of NGC 2681 is not variable and it is stellar in nature.The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698 and NGC 4672
Chapter in The Formation of Galactic Bulges, Cambridge University Press (CUP) (2000) 165-169
Counterrotating gaseous components in the early-type galaxy IC 4889
ASTR SOC P 197 (2000) 251-252
Isolated cores in early-type disk galaxies: NGC 4672
ASTR SOC P 221 (2000) 249-252
Abstract:
The morphological features of the early-type disk galaxy NGC 4672 are discussed as well as the velocity curves and velocity dispersion profiles of stars and ionized gas along both its major and minor axes. We conclude that NGC 4672 has structural (i.e. a bulge elongated perpendicularly to the disk) and kinematical (i.e, a stellar core rotating perpendicularly to the disk) properties similar to those of the Sa NGC 4698. The presence of the isolated core suggests that the disk component is the end result of the acquisition of external material in polar orbits around a pre-existing oblate spheroid, as in the case of the ring component of AM 2020-504, the prototype of polar ring ellipticals.Kinematic properties of the gas in the central region of galaxies
ASTR SOC P 197 (2000) 131-132