Universidad de Granada Digibug
 

Repositorio Institucional de la Universidad de Granada >
1.-Investigación >
Departamentos, Grupos de Investigación e Institutos >
Departamento de Física Teórica y del Cosmos >
DFTC - Artículos >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/29035

Title: Non-circular motion evidence in the circumnuclear region of M100 (NGC 4321)
Authors: Castillo-Morales, A.
Jiménez Vicente, Jorge
Mediavilla, E.
Battaner, E.
Issue Date: 2007
Abstract: We analyse new integral field spectroscopy of the inner region (central 2.5 kpc) of the spiral galaxy NGC 4321 to study the peculiar kinematics of this region. Fourier analysis of the velocity residuals obtained by subtracting an axisymmetric rotation model from the Hα velocity field, indicates that the distortions are {\em global} features generated by an m=2 perturbation of the gravitational potential which can be explained by the nuclear bar. This bar has been previously observed in the near-infrared but not in the optical continuum dominated by star formation. We detect the optical counterpart of this bar in the 2D distribution of the old stellar population (inferred from the equivalent width map of the stellar absorption lines). We apply the Tremaine--Weinberg method to the stellar velocity field to calculate the pattern speed of the inner bar, obtaining a value of Ωb=160±70kms−1kpc−1. This value is considerably la rger than the one obtained when a simple bar model is considered. However the uncertainties in the pattern speed determination prevent us to give support to alternative scenarios.
Sponsorship: This paper has been supported by the ‘Plan Andaluz de Investigación’ (FQM-108) and by the ‘Secretaría de Estado de Política Científica y Tecnológica’ (AYA2000-2046-C02-01, AYA2004-08251-C02-02, ESP2004-06870-CO2-02). This research has made use of the NASA/IPAC Extragalactic Database which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We have used observations made with the NASA/ESA HST, obtained from the data archive at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. J. Jiménez-Vicente acknowledges support from the Consejería de Educación y Ciencia de la Junta de Andalucía. A. Castillo-Morales acknowledges the support from Universidad Complutense de Madrid (AYA2003-01676). We thank J. Knapen and A. Zurita for their help with the astrometric calibration of our images. We also acknowledge the support of the RTN Euro3D: ‘Promoting 3D spectroscopy in Europe’.
Publisher: Oxford University Press (OUP); Royal Astronomical Society
Keywords: Galaxies
NGC 4321
Kinematics and dynamics
URI: http://hdl.handle.net/10481/29035
ISSN: 0035-8711
1365-2966
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Castillo-Morales, A.; et al. Non-circular motion evidence in the circumnuclear region of M100 (NGC 4321). Monthly Notices of the Royal Astronomical Society, 380(2): 489-498 (2007). [http://hdl.handle.net/10481/29035]
Appears in Collections:DFTC - Artículos

Files in This Item:

File Description SizeFormat
Castillo_NGC4321.pdf653.65 kBAdobe PDFView/Open
Recommend this item

This item is licensed under a Creative Commons License
Creative Commons

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! OpenAire compliant DSpace Software Copyright © 2002-2007 MIT and Hewlett-Packard - Feedback

© Universidad de Granada