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The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of fast and slow rotators: Census of the stellar angular momentum in ETGs

Open access
Emsellem, Eric, Cappellari, Michele, Krajnović, Davor, Alatalo, Katherine, Blitz, Leo, Bois, Maxime, Bournaud, Frédéric, Bureau, Martin, Davies, Roger L., Davis, Timothy A., de Zeeuw, P. T., Khochfar, Sadegh, Kuntschner, Harald, Lablanche, Pierre-Yves, McDermid, Richard M., Morganti, Raffaella, Naab, Thorsten, Oosterloo, Tom, Sarzi, Marc, Scott, Nicholas, Serra, Paolo, van de Ven, Glenn, Weijmans, Anne-Marie, Young, Lisa M.·2011·Monthly Notices of the Royal Astronomical Society

Abstract

We provide a census of the apparent stellar angular momentum within one effective radius of a volume-limited sample of 260 early-type galaxies (ETGs) in the nearby Universe, using the integral-field spectroscopy obtained in the course of the ATLAS 3D project.We exploit the λ R parameter (previously used via a constant threshold value of 0.1) to characterize the existence of two families of ETGs: slow rotators which exhibit complex stellar velocity fields and often include stellar kinematically distinct cores, and fast rotators which have regular velocity fields.Our complete sample of 260 ETGs leads to a new criterion to disentangle fast and slow rotators which now includes a dependency on the apparent ellipticity .It separates the two classes significantly better than the previous prescription and better than a criterion based on V/σ : slow rotators and fast rotators have λ R lower and larger than k FS × √ , respectively, where k FS = 0.31 for measurements made within an effective radius R e .We show that the vast majority of ETGs are fast rotators: these have the regular stellar rotation, with aligned photometric and kinematic axes (Paper II of this series), include discs and often bars and represent 86 ± 2 per cent (224/260) of all ETGs in the volume-limited

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Crossref · 10.1111/j.1365-2966.2011.18496.x

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Metadata

Authors
Emsellem, E., Cappellari, M., Krajnović, D., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Khochfar, S., Kuntschner, H., Lablanche, P.-Y., McDermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., van de Ven, G., Weijmans, A.-M., & Young, L. M.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2011-05-16
Volume
414
Issue
2
Pages
888-912
ISSN
0035-8711 (ISSN-L)
OpenAlex
W2145086822
Cited by
756
References
74
FWCI
28.00
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of fast and slow rotators: Census of the stellar angular momentum in ETGs. https://app.cochat.ai/papers/10.1111/j.1365-2966.2011.18496.x
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Emsellem, E., Cappellari, M., Krajnović, D., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Khochfar, S., Kuntschner, H., Lablanche, P.-Y., McDermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., . . . Young, L. M. (2011). The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of fast and slow rotators: Census of the stellar angular momentum in ETGs. Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1111/j.1365-2966.2011.18496.x

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