The Astronomical Journal

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The Astronomical Journal Volume 127 Number 6 Create an alert RSS this journal

B. Vollmer et al. 2004 The Astronomical Journal 127 3375 doi:10.1086/420802

Radio Continuum Observations of the Virgo Cluster Spiral NGC 4522: The Signature of Ram Pressure

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B. Vollmer1,2, R. Beck2, Jeffrey D. P. Kenney3 and J. H. van Gorkom4

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Abstract References Cited By

Radio continuum observations at 20 and 6 cm of the highly inclined Virgo spiral galaxy NGC 4522 are presented. Both 20 and 6 cm total emission distributions are asymmetric with an extended component to the west, where extraplanar atomic gas and Hα emission are found. The 6 cm polarized emission is located at the eastern edge of the galactic disk. Its peak is located about 1 kpc to the east of the total emission peak. We argue that this phenomena is a characteristic feature for cluster galaxies that are experiencing significant pressure from the intracluster medium. Polarized radio continuum emission is thus a powerful tool to detect interactions of spiral galaxies with the cluster ICM. The degree of polarization decreases from the east to the west. The flattest spectral index between 20 and 6 cm coincides with the peak of the 6 cm polarized emission. These findings are consistent with a picture of a large-scale shock due to ram pressure located at the east of the galaxy where cosmic rays are accelerated. We conclude that it is likely that the galaxy experiences active ram pressure.


Keywords

galaxies: evolution; galaxies: individual (NGC 4522); galaxies: interactions; galaxies: ISM; galaxies: kinematics and dynamics; ISM: clouds; ISM: kinematics and dynamics


Dates

Issue 6 (2004 June)

Received 2003 December 12, accepted for publication 2004 February 27



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