2008MNRAS.390..383Y -
Mon. Not. R. Astron. Soc., 390, 383-398 (2008/October-2)
E+A and companion galaxies - I. A catalogue and statistics.
YAMAUCHI C., YAGI M. and GOTO T.
Abstract (from CDS):
Based on our intensive spectroscopic campaign with the GoldCam spectrograph on the Kitt Peak National Observatory (KPNO) 2.1-m telescope, we have constructed the first catalogue of E+A galaxies with spectroscopic companion galaxies, and investigated a probability that an E+A galaxy has close companion galaxies. We selected 660 E+A galaxies with 4.0 Å < Hδ EW at a redshift of <0.167 from the Data Release 5 of the Sloan Digital Sky Survey (SDSS). We selected their companion candidates from the SDSS imaging data, and classified them into true companions, fore/background galaxies and companion candidates using the SDSS and our KPNO spectra. We observed 26 companion candidates of E+A galaxies at the KPNO to measure their redshifts. Their spectra showed that 17 targets are true companion galaxies. The number of spectroscopically confirmed E+A's companions is now 34. This becomes the first catalogue of E+A galaxies with spectroscopic companion systems. We found that E+A galaxies have 54 per cent larger probability of having companion galaxies (7.88 per cent) as compared to the comparison sample of normal galaxies (5.12 per cent). A statistical test shows that the probabilities are different with 99.7 per cent significance. Our results based on spectroscopy tighten the connection between the dynamical merger/interaction and the origin of E+A galaxies.
Abstract Copyright:
© 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s):
galaxies: evolution - galaxies: interactions - galaxies: peculiar - galaxies: starburst
VizieR on-line data:
<Available at CDS (J/MNRAS/390/383): table1.dat>
Nomenclature:
Table 1: [YYG2008] NN (Nos 1-34). Table 5: [YYG2008] bN (Nos b1, b2). Table 6: [YYG2008] fN (Nos f1, f2). Tables 1, 5-6: [YYG2008] JHHMMSS.ss+DDMMSS.s N=68+4+4.
Simbad objects:
111
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