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2008MNRAS.390..408Z - Mon. Not. R. Astron. Soc., 390, 408-420 (2008/October-2)
The NGC 672 and 784 galaxy groups: evidence for galaxy formation and growth along a nearby dark matter filament.
ZITRIN A. and BROSCH N.
Abstract (from CDS):
Relations between the current SFR and the HI mass or the absolute B magnitude for the galaxies in these groups indicate that these objects behave like normal galaxies. A comparison of the photometric measurements with evolutionary synthesis model predictions indicates that most objects can be understood as containing at least one `old' stellar population (≥1-10 Gyr) and one `young' population (≤30 Myr). For both groups, the recent SF bursts appear to have occurred at similar times, a few to a few tens of Myr ago, arguing for synchronicity in SF in these objects.
In an attempt to evaluate the possible role of galaxy-galaxy interaction, we investigate the trend of the SFR with an object's projected distance from the brightest and most massive galaxies of each group. We do not find a steadily decreasing SF as function of this distance; such a result could be expected if the SF would have been triggered by interactions. We propose that one possible explanation of the nearly synchronous SF in all objects is accretion of cold gas from intergalactic space on to dark matter haloes arranged along a filament threading the void where these dwarf galaxies reside. We point out this galaxy sample as an ideal target to study hierarchical clustering and galaxy formation among very nearby objects.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): star: formation - galaxies: interactions
CDS comments: In Table 1 : NGC 111946 is a misprint for AGC 111946
Simbad objects: 20
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