NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-23 T04:20:15 PDT
Help | Comment | NED Home

For refcode 2004ApJ...613..866K:
Retrieve 57 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2004ApJ...613..866K H{alpha} Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies Rebecca A. Koopmann and Jeffrey D. P. Kenney Abstract. We describe the various H{alpha} morphologies of Virgo Cluster and isolated spiral galaxies and associate the H{alpha} morphologies with the types of environmental interactions that have altered the cluster galaxies. The spatial distributions of H{alpha} and R-band emission are used to divide the star formation morphologies of the 52 Virgo Cluster spiral galaxies into several categories: normal (37%), anemic (6%), enhanced (6%), and (spatially) truncated (52%). Truncated galaxies are further subdivided on the basis of their inner star formation rates into truncated/normal (37%), truncated/compact (6%), truncated/anemic (8%), and truncated/enhanced (2%). The fraction of anemic galaxies is relatively small (6% - 13%) in both environments, suggesting that starvation is not a major factor in the reduced star formation rates of Virgo spiral galaxies. The majority of Virgo spiral galaxies have their H{alpha} disks truncated (52%), whereas truncated H{alpha} disks are rarer in isolated galaxies (12%). Most of the H{alpha}-truncated galaxies have relatively undisturbed stellar disks and normal to slightly enhanced inner disk star formation rates, suggesting that intracluster medium - interstellar medium (ICM-ISM) stripping is the main mechanism causing the reduced star formation rates of Virgo spiral galaxies. Several of the truncated galaxies are peculiar, with enhanced central star formation rates, disturbed stellar disks, and barlike distributions of luminous H II complexes inside the central 1 kpc but no star formation beyond, suggesting that recent tidal interactions or minor mergers have also influenced their morphology. Two highly inclined H{alpha}-truncated spiral galaxies have numerous extraplanar H II regions and are likely in an active phase of ICM-ISM stripping. Several spiral galaxies have one-sided H{alpha} enhancements at the outer edge of their truncated H{alpha} disks, suggesting modest local enhancements in their star formation rates due to ICM-ISM interactions. Low-velocity tidal interactions and perhaps outer cluster H I accretion seem to be the triggers for enhanced global star formation in four Virgo galaxies. These results indicate that most Virgo spiral galaxies experience ICM-ISM stripping, many experience significant tidal effects, and many experience both. Keywords: Galaxies: Clusters: General, Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Fundamental Parameters, Galaxies: Peculiar, Galaxies: Spiral, Galaxies: Structure
Retrieve 57 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home