Hostname: page-component-7dd5485656-zlgnt Total loading time: 0 Render date: 2025-11-01T14:53:54.085Z Has data issue: false hasContentIssue false
  • English
  • Français

Kinematic lopsidedness in the dwarf irregular galaxy WLM

Published online by Cambridge University Press:  30 October 2025

M. Khademi Open the ORCID record for M. Khademi [Opens in a new window] ,
Y. Yang Open the ORCID record for Y. Yang [Opens in a new window] ,
F. Hammer  and
S. Nasiri
M. Khademi*
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), 19395-5531 Tehran, Iran GEPI, Observatoire de Paris, Universite PSL, CNRS, Place Jules Janssen 92195, Meudon, France Department of Physics, Shahid Beheshti University, 19839 Tehran, Iran
Y. Yang
Affiliation:
GEPI, Observatoire de Paris, Universite PSL, CNRS, Place Jules Janssen 92195, Meudon, France
F. Hammer
Affiliation:
GEPI, Observatoire de Paris, Universite PSL, CNRS, Place Jules Janssen 92195, Meudon, France
S. Nasiri
Affiliation:
Department of Physics, Shahid Beheshti University, 19839 Tehran, Iran
*
email: maryam.khademi@ipm.ir
Get access Rights & Permissions [Opens in a new window]

Abstract

To investigate whether an m = 1 perturbation in the halo potential could be a mechanism creating observed kinematical asymmetry in the rotation curve of the dwarf irregular galaxy WLM, we fit a theoretical rotational velocity associated with such a perturbation in the halo potential model to the observed data. We show that a lopsided halo potential model can explain the asymmetry in the kinematic data reasonably well. To investigate how well such a small perturbation in the halo potential represents the observed asymmetries in the rotation curve and in the velocity field of WLM, we measure the value of the perturbation parameter Ɛper from the kinematic data on the rotation curve of both sides in the outer part. We obtain the value of the perturbation parameter denoting the perturbed halo potential of about 0.2.

Keywords

Galaxies: kinematics and dynamicsgalaxies: dark matter halogalaxies: structuregalaxies: dwarfgalaxies: Local Group

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 167 - 171
Check for updates
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

Bellocchi, E., Arribas, S., and Colina, L. 2016, Astronomy and Astrophysics 591, A85. doi: 10.1051/0004-6361/201526974.CrossRefGoogle Scholar
Hammer, F., Flores, H., Puech, M., Yang, Y.B., Athanassoula, E., Rodrigues, M., and, …: 2009, Astronomy and Astrophysics 507, 1313. doi: 10.1051/0004-6361/200912115.CrossRefGoogle Scholar
Hammer, F., Puech, M., Flores, H., & Rodrigues, M. 2017, Studying Distant Galaxies: a Handbook of Methods and Analyses, first edn. (New Jersey: World Scientific)Google Scholar
Ianjamasimanana, R., Namumba, B., Ramaila, A.J.T., Saburova, A.S., Józsa, G.I.G., Myburgh, T., and, …: 2020, Monthly Notices of the Royal Astronomical Society 497, 4795. doi: 10.1093/mnras/staa1967.CrossRefGoogle Scholar
Kepley, A.A., Wilcots, E.M., Hunter, D.A., and Nordgren, T. 2007, The Astronomical Journal 133, 2242. doi: 10.1086/513716.CrossRefGoogle Scholar
Khademi, M., Yang, Y., Hammer, F., and Nasiri, S. 2021, Astronomy and Astrophysics 654, A7. doi: 10.1051/0004-6361/202140336.CrossRefGoogle Scholar
Khademi, M. and Nasiri, S. 2022, Canadian Journal of Physics 100, 201. doi: 10.1139/cjp-2021-0332.CrossRefGoogle Scholar
Krajnović, D., Cappellari, M., de Zeeuw, P.T., and Copin, Y. 2006, Monthly Notices of the Royal Astronomical Society 366, 787. doi: 10.1111/j.1365-2966.2005.09902.x.CrossRefGoogle Scholar
Pasha, I., Mandelker, N., van den Bosch, F.C., Springel, V., and van de Voort, F. 2023, Monthly Notices of the Royal Astronomical Society 520, 2692. doi: 10.1093/mnras/stac3776.CrossRefGoogle Scholar
Puech, M., Hammer, F., Flores, H., Östlin, G., and Marquart, T. 2006, Astronomy and Astrophysics 455, 119. doi: 10.1051/0004-6361:20054218.CrossRefGoogle Scholar
Shapiro, K.L., Genzel, R., Förster Schreiber, N.M., Tacconi, L.J., Bouché, N., Cresci, G., and, …: 2008, The Astrophysical Journal 682, 231. doi: 10.1086/587133.CrossRefGoogle Scholar
van Eymeren, J., Jütte, E., Jog, C.J., Stein, Y., and Dettmar, R.-J.: 2011, Astronomy and Astrophysics 530, A29. doi: 10.1051/0004-6361/201016177.CrossRefGoogle Scholar
van Eymeren, J., Jütte, E., Jog, C.J., Stein, Y., and Dettmar, R.-J.: 2011, Astronomy and Astrophysics 530, A30. doi: 10.1051/0004-6361/201016178.CrossRefGoogle Scholar
Yang, Y., Ianjamasimanana, R., Hammer, F., Higgs, C., Namumba, B., Carignan, C., and, …: 2022, Astronomy and Astrophysics 660, L11. doi: 10.1051/0004-6361/202243307.CrossRefGoogle Scholar