Star formation in galaxies falling into clusters along supercluster-scale filaments

Porter, Scott C., Raychaudhury, Somak, Pimbblet, Kevin A. and Drinkwater, Michael J. (2008) Star formation in galaxies falling into clusters along supercluster-scale filaments. Monthly Notices of the Royal Astronomical Society, 388 3: 1152-1160. doi:10.1111/j.1365-2966.2008.13388.x


Author Porter, Scott C.
Raychaudhury, Somak
Pimbblet, Kevin A.
Drinkwater, Michael J.
Title Star formation in galaxies falling into clusters along supercluster-scale filaments
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2008-08
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2008.13388.x
Open Access Status DOI
Volume 388
Issue 3
Start page 1152
End page 1160
Total pages 9
Editor A. C. Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2009
Language eng
Abstract With the help of a statistical parameter derived from optical spectra, we show that the current star formation rate of a galaxy, falling into a cluster along a supercluster filament, is likely to undergo a sudden enhancement before the galaxy reaches the virial radius of the cluster. From a sample of 52 supercluster-scale filaments of galaxies joining a pair of rich clusters of galaxies within the two-degree Field Redshift Survey region, we find a significant enhancement of star formation, within a narrow range between ∼2 and 3 h−170 Mpc of the centre of the cluster into which the galaxy is falling. This burst of star formation is almost exclusively seen in the fainter dwarf galaxies (MB≥−20) . The relative position of the peak does not depend on whether the galaxy is a member of a group or not, but non-group galaxies have on average a higher rate of star formation immediately before falling into a cluster. From the various trends, we conclude that the predominant process responsible for this rapid burst is the close interaction with other galaxies falling into the cluster along the same filament, if the interaction occurs before the gas reservoir of the galaxy gets stripped off due to the interaction with the intracluster medium.
Keyword galaxies: clusters: general
galaxies: evolution
galaxies: starburst
cosmology: observations
large-scale structure of Universe
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Published Online: 4 Jul 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Wed, 25 Mar 2009, 13:44:15 EST by Jo Hughes on behalf of School of Mathematics & Physics