The fate of spiral galaxies in clusters: The star formation history of the anemic Virgo Cluster galaxy NGC 4569



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Boselli, A. and Boissier, S. and Cortese, L. and Gil de Paz, Armando and Seibert, M and Madore, B. F. and Buat, V. and Martin, D. C. (2006) The fate of spiral galaxies in clusters: The star formation history of the anemic Virgo Cluster galaxy NGC 4569. Astrophysical journal, 651 (2). pp. 811-821. ISSN 0004-637X

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We present a new method for studying the star formation history of late-type cluster galaxies undergoing gas starvation or a ram pressure stripping event by combining bidimensional multifrequency observations with multizone models of galactic chemical and spectrophotometric evolution. This method is applied to the Virgo Cluster anemic galaxy NGC 4569. We extract radial profiles from recently obtained UV GALEX images at 1530 and 2310 Å, from visible and near-IR narrow (Hα) and broadband images at different wavelengths (u, B, g, V, r, i, z, J, H, and K), from Spitzer IRAC and MIPS images, and from atomic and molecular gas maps. The model in the absence of interaction (characterized by its rotation velocity and spin parameter) is constrained by the unperturbed H-band light profile and by the Hα rotation curve. We can reconstruct the observed total gas radial density profile and the light surface brightness profiles at all wavelengths in a ram pressure stripping scenario by making simple assumptions about the gas removal process and the orbit of NGC 4569 inside the cluster. The observed profiles cannot be reproduced by simply stopping gas infall, thus mimicking starvation. Gas removal is required, which is more efficient in the outer disk, inducing radial quenching in the star formation activity, as observed and reproduced by the model. This observational result, consistent with theoretical predictions that a galaxy cluster-IGM interaction is able to modify structural disk parameters without gravitational perturbations, is discussed in the framework of the origin of lenticular galaxies in clusters.

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© 2006. The American Astronomical Society. All rights reserved. GALEX is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales (CNES) of France and the Korean Ministry of Science and Technology. We thank G. Gavazzi and N. Prantzos for their long-term collaboration in the subjects studied in this paper. S. B. thanks the CNES for its funding through GALEX-Marseille. We wish to thank B. Vollmer and J. Kenney for their valuable comments, and the GALEX SODA team for their help with the data reduction.

Uncontrolled Keywords:Chemo-spectrophotometric evolution; Alpha surface photometry; Spectral energy-distributions; Digital sky survey; Disk galaxies; Ram pressure; Hα; Nearby clusters; Rich clusters; S0 galaxies
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35888
Deposited On:23 Feb 2016 16:33
Last Modified:10 Dec 2018 15:05

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