The giant H-alpha/X-ray filament in the cluster of galaxies A1795

Details The giant H-alpha/X-ray filament in the cluster of galaxies A1795 The giant H-alpha/X-ray filament in the cluster of galaxies A1795

2005-05-04

arxiv.org/abs/astro-ph/0505069v1

Mon.Not.Roy.Astron.Soc.361:17-33,2005

Astronomy and Astrophysics

Astrophysics

21 pages 14 figures; full resolution copy of paper available at http://www-xray.ast.cam.ac.uk/~csc/a1795.html

Scientific paper

10.1111/j.1365-2966.2005.09149.x

The cluster of galaxies A1795 hosts a 46 kpc-long filament at its core, which is clearly visible in the light of H-alpha and X-ray emission. We present optical slit spectroscopy and deeper Chandra X-ray data of the filament. The optical spectra reveal that the the bulk of the filament is quiescent (with sigma < 130 km/s), although considerable velocity structure is apparent around the powerful radio source in the central cluster galaxy, where a direct interaction is occurring between the radio plasma and the surrounding intracluster medium. The filament contains a clump of UV/blue continuum halfway along its length, which we resolve into a chain of at least 5 distinct knots using archival HST images; the optical spectrum of this clump confirm it to be mostly comprised of O stars. It is well-removed from the central galaxy and radio source, and is most likely an example of a group of young star clusters condensing directly from the cooling gas in the filament. The observed spatial offset between these knots of star formation and the peak in the optical line emission confirms that the massive star formation is most unlikely to be responsible for the bulk of the observed emission-line luminosity in the filament. Some other (as yet undetermined) source of energy is required to power and maintain the optical line-emission, yet it must not completely impede the cooling of the X-ray gas within the filament to form the star clusters.

Affiliated with

Also associated with

No associations

Rating

The giant H-alpha/X-ray filament in the cluster of galaxies A1795 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The giant H-alpha/X-ray filament in the cluster of galaxies A1795, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The giant H-alpha/X-ray filament in the cluster of galaxies A1795 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-592685