J/A+A/597/A134 Kohonen selected E+A galaxies from SDSS DR7 (Meusinger+, 2017)
A large sample of Kohonen selected E+A (post-starburst) galaxies from the
Sloan Digital Sky Survey.
Meusinger H., Bruenecke J., Schalldach P., in der Au A.
<Astron. Astrophys. 597, A134 (2017)>
=2017A&A...597A.134M 2017A&A...597A.134M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, peculiar ; Active gal. nuclei ; Galaxies, spectra ;
Morphology
Keywords: galaxies: interactions - galaxies: starburst - galaxies: active -
surveys - virtual observatory tools
Abstract:
We created and analysed a large sample of local (z<0.4)
post-starburst (PSB) galaxies. In the colour-mass diagram, the PSB
sample is clearly concentrated towards the region between the red and
the blue cloud, in agreement with the idea that PSB galaxies represent
the transitioning phase between actively and passively evolving
galaxies. The relative frequency of distorted PSB galaxies is at least
57%, significantly higher than in a comparison sample. The search for
active galactic nuclei (AGN) based on conventional selection criteria
in the radio and MIR results in a low AGN fraction of 2-3%. We
confirm an MIR excess in the mean SED of the PSB galaxy sample that
may indicate hidden AGNs, though other sources are also possible.
Description:
We present a catalogue of 2665 E+A galaxies of type E+A. The selection
is based on a huge Kohonen self-organising map (SOM) of about one
million spectra from the Sloan Digital Sky Survey Data Release 7 and
is defined by the following criteria for the equivalent widths (EW) of
the Halpha, Hdelta and [OII] lines: EW(Hα)>-5Å,
EW(Hδ)>3Å, EW([OII])>-5Å (positive values for absorption).
The galaxy redshifts cover the range z=0.02 to 0.4, with a mean
redshift of z=0.13. The catalogue contains the redshift and EWs. In
addition, morphological types from the Galaxy Zoo project are listed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
psb_sdss.dat 89 2665 E+A galaxies from SDSS DR7
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See also:
J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011)
Byte-by-byte Description of file: psb_sdss.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- SDSS SDSS designation (HHMMSS.ss+DDMMSS.s)
20- 24 I5 --- MJD Modified Julian Date
26- 29 I4 --- Plate Spectroscopic plate id
31- 33 I3 --- Fiber Spectroscopic fiber id
35- 39 F5.3 --- zsp Spectroscopic redshift
42- 47 F6.2 0.1nm EWHa Equivalent width of Hα (1)
50- 55 F6.2 0.1nm EWHd Equivalent width of Hδ (1)
59- 63 F5.2 0.1nm EW[OII]1 Equivalent width of [OII] (1)
67- 71 F5.2 0.1nm EW[OII]2 Equivalent width of [OII] (1)
73- 77 F5.3 --- Pe ? Probablity for elliptical galaxy (2)
79- 83 F5.3 --- Ps ? Probablity for spiral galaxy (2)
85- 89 F5.3 --- Pm ? Probablity for galaxy merger (2)
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Note (1): positive values for absorption lines.
Note (2): from Galaxy Zoo (Lintott et al., 2011, Cat. J/MNRAS/410/166).
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Acknowledgements:
Helmut Meusinger, meus(at)tls-tautenburg.de
(End) Patricia Vannier [CDS] 29-Nov-2016