The Gaseous Halo of the Virgo Cluster Galaxy NGC 4569

Hensler, G.; Tschöke, D.; Bomans, D. J.; Boselli, A.

doi:10.1007/978-94-017-3315-1_31

Cited by 1 publication

(3 citation statements)

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“…NGC 4569 has smooth, relatively featureless, outer spiral arms and a ring of star formation at 0.3 r 24 . A distinct peculiar arm of HII regions, which begins at the Hα truncation radius and has an HI counterpart (Vollmer et al 2004), may be extraplanar (Hensler et al 2003). This arm resembles the one-arm gas morphologies commonly seen in the ICM-ISM interaction simulations of Schulz & Struck (2001) and Vollmer et al (2001).…”

Section: Truncated Spirals With Normal Inner Disksmentioning

confidence: 73%

“…Simulations including the effects of rotation on ICM-ISM interactions show in some phases one dominant extraplanar gas arm emerging from the outer edges of truncated gas disk (Vollmer et al 2001;Schulz & Struck 2001). Such arms may be observed in NGC 4548 (Vollmer et al 2000), NGC 4654 (Phookun & Mundy 1995;Vollmer 2003), and NGC 4569 (Vollmer et al 2004;Hensler et al 2003;Kenney et al in prep). Simulations show that the arms can transfer angular momentum from the inner gas disk, which can make a contracted, denser, 'annealed' inner gas disk, which has some resistance to further stripping (Schulz & Struck 2001).…”

Section: Icm-ism Interactionsmentioning

confidence: 98%

“…6.-Three Virgo Cluster galaxies with star forming disks truncated within 0.4r 24 , normal-enhanced inner star formation rates, and peculiar Hα distributions, possibly extraplanar emission. NGC 4569 has a ring of star formation at about 0.3r 24 and a detached arm of HII regions, which may be extraplanar (Hensler et al 2003). NGC 4522 appears to interacting with the ICM, based on the extraplanar HII regions and disturbed HI and radio continuum (Kenney & Koopmann 1999;Kenney et al 2004) The Hα emission in NGC 4351 is offset from the apparent center in R. See Figure 4 for details on the plots.…”

Section: Virgo Galaxies With Enhanced Inner and Total Starmentioning

confidence: 99%

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Hα Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies

Koopmann

Kenney

2004

ApJ

285

348

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We describe the various Hα morphologies of Virgo Cluster and isolated spiral galaxies, and associate the Hα morphologies with the types of environmental interactions which have altered the cluster galaxies. The spatial distributions of Hα and R-band emission are used to divide the star formation morphologies of the 52 Virgo Cluster spirals into several categories: normal (37%), anemic (6%), enhanced (6%), and (spatially) truncated (52%). Truncated galaxies are further subdivided based on 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 spirals. The majority of Virgo spiral galaxies have their Hα disks truncated (52%), whereas truncated Hα disks are rarer in isolated galaxies (12%). Most of the Hα-truncated galaxies have relatively undisturbed stellar disks and normal-to-slightly enhanced inner disk star formation rates, suggesting that ICM-ISM stripping is the main mechanism causing the reduced star formation rates of Virgo spirals. Several of the truncated galaxies are peculiar, with enhanced central star formation rates, disturbed stellar disks, and bar-like distributions of luminous HII complexes inside the central 1 kpc, but no star formation beyond, suggesting recent tidal interactions or minor mergers have also influenced their morphology. Two highly-inclined Hα-truncated spirals have numerous extraplanar HII regions, and are likely in an active phase of ICM-ISM stripping. Several spirals have one-sided Hα enhancements at the outer edge of their truncated Hα disks, suggesting modest and local enhancements in their star formation rates due to ICM-ISM interactions. Low-velocity tidal interactions and perhaps outer cluster HI 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.

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