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NGC 4522 BVR Broadband color image of the Virgo Cluster spiral galaxy NGC4522. Most of the light in this picture arises from stars. The dark lanes are due to dust which blocks some of the starlight. This highly inclined galaxy has a relatively normal distribution of old stars, but bright, blue newly-formed star clusters can be seen embedded within gas filaments which emerge from the disk plane toward the NW. Image from WIYN 3.5-meter telescope.
NGC 4522 H-alpha and R H-alpha and broadband (R band) optical maps of the Virgo Cluster spiral galaxy NGC4522. The galaxy has been rotated for this figure. (a) The top panel shows grayscale and contour maps of H-alpha emission. Note that there is no H-alpha emission, and therefore no ionized gas and no star formation, in the outer disk. (b) The middle panel shows grayscale and contour maps of R-band emission. The distribution of starlight appears normal for an inclined spiral disk galaxy. (c) The bottom panel shows an overlay of the H-alpha map (grayscale) on the R-band map (contours). Note that the distributions of stars and gas are very different! There is no gas in the outer disk, but there are gas filaments emerging from the plane of the disk. This is gas in the process of leaving the galaxy, as it is stripped by the ram pressure force exerted by gas in the intracluster medium. Images from WIYN 3.5-meter telescope.
Click here for the journal article which describes these results.
All images taken by Jeff Kenney at the WIYN 3.5-meter telescope.
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All images © WIYN Consortium, Inc., 1999. Last updated:December 15, 1999. __________________________________________________________________________