The Unusual Vertical Mass Distribution of NGC 4013 Seen through the Spitzer Survey of Stellar Structure in Galaxies (S⁴G)

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dc.contributor.author Buta, Ronald
dc.date.accessioned 2019-08-01T19:33:07Z
dc.date.available 2019-08-01T19:33:07Z
dc.date.issued 201-08-17
dc.identifier.citation Comerón, S., et al. (2011): The Unusual Vertical Mass Distribution of NGC 4013 Seen through the Spitzer Survey of Stellar Structure in Galaxies (S⁴G). The Astrophysical Journal Letters, 738(2). DOI: http://dx.doi.org/10.1088/2041-8205/738/2/L17 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/6185
dc.description.abstract NGC 4013 is a nearby Sb edge-on galaxy known for its “prodigious” H i warp and its “giant” tidal stream. Previous work on this unusual object shows that it cannot be fitted satisfactorily by a canonical thin+thick disk structure. We have produced a new decomposition of NGC 4013, considering three stellar flattened components (thin+thick disk plus an extra and more extended component) and one gaseous disk. All four components are considered to be gravitationally coupled and isothermal. To do so, we have used the 3.6μm images from the Spitzer Survey of Stellar Structure in Galaxies. We find evidence for NGC 4013 indeed having a thin and a thick disk and an extra flattened component. This smooth and extended component (scale height zEC ∼ 3 kpc) could be interpreted as a thick disk or as a squashed ellipsoidal halo and contains ∼20% of the total mass of all three stellar components. We argue it is unlikely to be related to the ongoing merger or due to the off-plane stars from a warp in the other two disk components. Instead, we favor a scenario in which the thick disk and the extended component were formed in a two-stage process, in which an initially thick disk has been dynamically heated by a merger soon enough in the galaxy history to have a new thick disk formed within it. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject galaxies: individual (NGC 4013) en_US
dc.subject galaxies: photometry en_US
dc.subject galaxies: spiral en_US
dc.subject galaxies: structure en_US
dc.title The Unusual Vertical Mass Distribution of NGC 4013 Seen through the Spitzer Survey of Stellar Structure in Galaxies (S⁴G) en_US
dc.type text en_US


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