SIMBAD references

1999AJ....117..181K - Astron. J., 117, 181-189 (1999/January-0)

Ongoing gas stripping in the Virgo cluster spiral galaxy NGC 4522.


Abstract (from CDS):

The Virgo Cluster galaxy NGC 4522 is one of the best spiral candidates for intracluster medium-interstellar medium (ICM-ISM) stripping in action. Optical broadband and Hα images from the WIYN telescope of the highly inclined galaxy reveal a relatively undisturbed stellar disk and a peculiar distribution of Hα emission. Ten percent of the Hα emission arises from extraplanar H II regions which appear to lie within filamentary structures ≥3 kpc long above one side of the disk. The filaments emerge from the outer edge of a disk of bright Hα emission which is abruptly truncated beyond 0.35R25. Together the truncated Hα disk and extraplanar Hα filaments are reminiscent of a bow shock morphology, which strongly suggests that ISM of NGC 4522 is being stripped by the gas pressure of the ICM. The galaxy has a line-of-sight velocity of ≃1300 km.s–1 with respect to the mean Virgo Cluster velocity and thus is expected to experience a strong interaction with the intracluster gas. The existence of H II regions apparently located above the disk plane suggests that star formation is occurring in the stripped gas, and that newly formed stars will enter the galaxy halo and/or intracluster space. The absence of H II regions in the disk beyond 0.35R25 and the existence of H II regions in the stripped gas suggest that even molecular gas has been effectively removed from the disk of the galaxy.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Evolution - Galaxies: Interactions - Galaxies: ISM - Galaxies: Peculiar - Galaxies: Structure

CDS comments: In introduction : galaxies 97073, 97079, 97087 are : Z 97 - 73, Z 97 - 79, Z 97 - 87.

Simbad objects: 23

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:1999AJ....117..181K and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact