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Title: Diffuse LINER-type emission from extended disc regions of barred galaxies

Abstract

ABSTRACT We present a spectroscopic analysis of the central disc regions of barred spiral galaxies, concentrating on the region that is swept by the bar but not including the bar itself (the ‘star formation desert’ or SFD region). New spectroscopy is presented for 34 galaxies, and the full sample analysed comprises 48 SBa–SBcd galaxies. These data confirm the full suppression of SF within the SFD regions of all but the latest type (SBcd) galaxies. However, diffuse [N ii] and H α line emission is detected in all galaxies. The ubiquity and homogeneous properties of this emission from SBa to SBc galaxies favour post-asymptotic giant branch (p-AGB) stars as the source of this line excitation, rather than extreme blue horizontal branch stars. The emission-line ratios strongly exclude any contribution from recent SF, but are fully consistent with recent population synthesis modelling of p-AGB emission by other authors, and favour excitation dominated by ambient gas of approximately solar abundance, rather than ejecta from the AGB stars themselves. The line equivalent widths are also larger than those observed in many fully passive (e.g. elliptical) galaxies, which may also be a consequence of a greater ambient gas density in the SFD regions.

Authors:
 [1];  [1]
  1. Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1633129
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 496 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Percival, S. M., and James, P. A. Diffuse LINER-type emission from extended disc regions of barred galaxies. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa1369.
Percival, S. M., & James, P. A. Diffuse LINER-type emission from extended disc regions of barred galaxies. United Kingdom. doi:https://doi.org/10.1093/mnras/staa1369
Percival, S. M., and James, P. A. Sat . "Diffuse LINER-type emission from extended disc regions of barred galaxies". United Kingdom. doi:https://doi.org/10.1093/mnras/staa1369.
@article{osti_1633129,
title = {Diffuse LINER-type emission from extended disc regions of barred galaxies},
author = {Percival, S. M. and James, P. A.},
abstractNote = {ABSTRACT We present a spectroscopic analysis of the central disc regions of barred spiral galaxies, concentrating on the region that is swept by the bar but not including the bar itself (the ‘star formation desert’ or SFD region). New spectroscopy is presented for 34 galaxies, and the full sample analysed comprises 48 SBa–SBcd galaxies. These data confirm the full suppression of SF within the SFD regions of all but the latest type (SBcd) galaxies. However, diffuse [N ii] and H α line emission is detected in all galaxies. The ubiquity and homogeneous properties of this emission from SBa to SBc galaxies favour post-asymptotic giant branch (p-AGB) stars as the source of this line excitation, rather than extreme blue horizontal branch stars. The emission-line ratios strongly exclude any contribution from recent SF, but are fully consistent with recent population synthesis modelling of p-AGB emission by other authors, and favour excitation dominated by ambient gas of approximately solar abundance, rather than ejecta from the AGB stars themselves. The line equivalent widths are also larger than those observed in many fully passive (e.g. elliptical) galaxies, which may also be a consequence of a greater ambient gas density in the SFD regions.},
doi = {10.1093/mnras/staa1369},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 496,
place = {United Kingdom},
year = {2020},
month = {5}
}

Journal Article:
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DOI: https://doi.org/10.1093/mnras/staa1369

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