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Title: Wobbly discs – corrugations seen in the dust lanes of edge-on galaxies

Abstract

ABSTRACT We report the detection of small-scale bending waves, also known as corrugations, in the dust lanes of five nearby edge-on disc galaxies. This phenomenon, where the disc mid-plane bends to become wavy, just as in warps but on a smaller scale, is seen here for the first time, in the dust lanes running across the discs. Because they are seen in absorption, this feature must be present in the dust disc in the outskirts of these galaxies. We enhance the visibility of these features using unsharp masking, trace the dust mid-plane across the disc, measure the corrugation amplitude by eye and the corrugation wavelength using Fourier analysis. The corrugation amplitude is found to be in the range of 70–300pc and the wavelengths lie between 1 and 5 kpc. In this limited sample, we find that the amplitude of the corrugations tends to be larger for lower mass galaxies, whereas the wavelength of corrugation does not seem to depend on the mass of host galaxies. Linear stability analysis is performed to find out the dynamical state of these dust discs. Based on WKB analysis, we find that the dust corrugations in about half of our sample are stable. Further analysis, onmore » a larger sample would be useful to strengthen the above results.« less

Authors:
ORCiD logo [1];  [2];  [3]
  1. National Centre for Radio Astrophysics, TIFR, Pune 411007, India, Fakultät für Physik und Astronomie, Astronomisches Institut (AIRUB), Ruhr-Universität Bochum, Universitätsstrasse. 150, D-44801 Bochum, Germany
  2. Fakultät für Physik und Astronomie, Astronomisches Institut (AIRUB), Ruhr-Universität Bochum, Universitätsstrasse. 150, D-44801 Bochum, Germany
  3. Inter-University Centre for Astronomy and Astrophysics, Pune 411007, India
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1632211
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: 495 Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Narayan, Chaitra A., Dettmar, Ralf-Jürgen, and Saha, Kanak. Wobbly discs – corrugations seen in the dust lanes of edge-on galaxies. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa1400.
Narayan, Chaitra A., Dettmar, Ralf-Jürgen, & Saha, Kanak. Wobbly discs – corrugations seen in the dust lanes of edge-on galaxies. United Kingdom. doi:https://doi.org/10.1093/mnras/staa1400
Narayan, Chaitra A., Dettmar, Ralf-Jürgen, and Saha, Kanak. Sat . "Wobbly discs – corrugations seen in the dust lanes of edge-on galaxies". United Kingdom. doi:https://doi.org/10.1093/mnras/staa1400.
@article{osti_1632211,
title = {Wobbly discs – corrugations seen in the dust lanes of edge-on galaxies},
author = {Narayan, Chaitra A. and Dettmar, Ralf-Jürgen and Saha, Kanak},
abstractNote = {ABSTRACT We report the detection of small-scale bending waves, also known as corrugations, in the dust lanes of five nearby edge-on disc galaxies. This phenomenon, where the disc mid-plane bends to become wavy, just as in warps but on a smaller scale, is seen here for the first time, in the dust lanes running across the discs. Because they are seen in absorption, this feature must be present in the dust disc in the outskirts of these galaxies. We enhance the visibility of these features using unsharp masking, trace the dust mid-plane across the disc, measure the corrugation amplitude by eye and the corrugation wavelength using Fourier analysis. The corrugation amplitude is found to be in the range of 70–300pc and the wavelengths lie between 1 and 5 kpc. In this limited sample, we find that the amplitude of the corrugations tends to be larger for lower mass galaxies, whereas the wavelength of corrugation does not seem to depend on the mass of host galaxies. Linear stability analysis is performed to find out the dynamical state of these dust discs. Based on WKB analysis, we find that the dust corrugations in about half of our sample are stable. Further analysis, on a larger sample would be useful to strengthen the above results.},
doi = {10.1093/mnras/staa1400},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 495,
place = {United Kingdom},
year = {2020},
month = {5}
}

Journal Article:
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DOI: https://doi.org/10.1093/mnras/staa1400

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