Bibcode
Comerón, Sébastien; Elmegreen, Bruce G.; Knapen, J. H.; Sheth, Kartik; Hinz, Joannah L.; Regan, Michael W.; Gil de Paz, Armando; Muñoz-Mateos, Juan-Carlos; Menéndez-Delmestre, Karín; Seibert, Mark; Kim, Taehyun; Mizusawa, Trisha; Laurikainen, Eija; Salo, Heikki; Laine, Jarkko; Athanassoula, E.; Bosma, Albert; Buta, Ronald J.; Gadotti, Dimitri A.; Ho, Luis C.; Holwerda, Benne; Schinnerer, Eva; Zaritsky, Dennis
Referencia bibliográfica
The Astrophysical Journal Letters, Volume 738, Issue 2, article id. L17 (2011).
Advertised on:
9
2011
Número de citas
24
Número de citas referidas
21
Descripción
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 3.6 μm 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 z EC ~ 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.
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