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35 results on '"Lablanche, P.-Y."'

1. A probabilistic approach to emission-line galaxy classification

Author

de Souza, R. S., Dantas, M. L. L., Costa-Duarte, M. V., Feigelson, E. D., Killedar, M., Lablanche, P. -Y., Vilalta, R., Krone-Martins, A., Beck, R., and Gieseke, F.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics, Statistics - Machine Learning
Abstract

We invoke a Gaussian mixture model (GMM) to jointly analyse two traditional emission-line classification schemes of galaxy ionization sources: the Baldwin-Phillips-Terlevich (BPT) and $\rm W_{H\alpha}$ vs. [NII]/H$\alpha$ (WHAN) diagrams, using spectroscopic data from the Sloan Digital Sky Survey Data Release 7 and SEAGal/STARLIGHT datasets. We apply a GMM to empirically define classes of galaxies in a three-dimensional space spanned by the $\log$ [OIII]/H$\beta$, $\log$ [NII]/H$\alpha$, and $\log$ EW(H${\alpha}$), optical parameters. The best-fit GMM based on several statistical criteria suggests a solution around four Gaussian components (GCs), which are capable to explain up to 97 per cent of the data variance. Using elements of information theory, we compare each GC to their respective astronomical counterpart. GC1 and GC4 are associated with star-forming galaxies, suggesting the need to define a new starburst subgroup. GC2 is associated with BPT's Active Galaxy Nuclei (AGN) class and WHAN's weak AGN class. GC3 is associated with BPT's composite class and WHAN's strong AGN class. Conversely, there is no statistical evidence -- based on four GCs -- for the existence of a Seyfert/LINER dichotomy in our sample. Notwithstanding, the inclusion of an additional GC5 unravels it. The GC5 appears associated to the LINER and Passive galaxies on the BPT and WHAN diagrams respectively. Subtleties aside, we demonstrate the potential of our methodology to recover/unravel different objects inside the wilderness of astronomical datasets, without lacking the ability to convey physically interpretable results. The probabilistic classifications from the GMM analysis are publicly available within the COINtoolbox (https://cointoolbox.github.io/GMM\_Catalogue/)., Comment: Accepted for publication in MNRAS

Published
2017
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2. Molecular Gas and Star Formation in Local Early-Type Galaxies

Author

Bureau, M., Davis, T. A., Alatalo, K., Crocker, A. F., Blitz, L., Young, L. M., Combes, F., Bois, M., Bournaud, F., Cappellari, M., Davies, R. L., de Zeeuw, P. T., Duc, P. -A., Emsellem, E., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y., McDermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., and Weijmans, A.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

The molecular gas content of local early-type galaxies is constrained and discussed in relation to their evolution. First, as part of the Atlas3D survey, we present the first complete, large (260 objects), volume-limited single-dish survey of CO in normal local early-type galaxies. We find a surprisingly high detection rate of 22%, independent of luminosity and at best weakly dependent on environment. Second, the extent of the molecular gas is constrained with CO synthesis imaging, and a variety of morphologies is revealed. The kinematics of the molecular gas and stars are often misaligned, implying an external gas origin in over a third of the systems, although this behaviour is drastically diffferent between field and cluster environments. Third, many objects appear to be in the process of forming regular kpc-size decoupled disks, and a star formation sequence can be sketched by piecing together multi-wavelength information on the molecular gas, current star formation, and young stars. Last, early-type galaxies do not seem to systematically obey all our usual prejudices regarding star formation, following the standard Schmidt-Kennicutt law but not the far infrared-radio correlation. This may suggest a greater diversity in star formation processes than observed in disk galaxies. Using multiple molecular tracers, we are thus starting to probe the physical conditions of the cold gas in early-types., Comment: Proceedings of the IAU Symposium 277 "Tracing the Ancestry of Galaxies". 4 pages, 3 figures

Published
2011
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3. Investigating the merger origin of Early-Type Galaxies using ultra-deep optical images

Author

Duc, P. -A., Cuillandre, J. -C., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Cappellari, M., Cote, P., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Emsellem, E., Ferrarese, L., Ferriere, E., Gwyn, S., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y., MacArthur, L., McDermid, R. M., Michel-Dansac, L., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., Weijmans, A., and Young, L. M.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The mass assembly of galaxies leaves various imprints on their surroundings, such as shells, streams and tidal tails. The frequency and properties of these fine structures depend on the mechanism driving the mass assembly: e.g. a monolithic collapse, rapid cold-gas accretion followed by violent disk instabilities, minor mergers or major dry / wet mergers. Therefore, by studying the outskirts of galaxies, one can learn about their main formation mechanism. I present here our on-going work to characterize the outskirts of Early-Type Galaxies (ETGs), which are powerful probes at low redshift of the hierarchical mass assembly of galaxies. This work relies on ultra-deep optical images obtained at CFHT with the wide-field of view MegaCam camera of field and cluster ETGs obtained as part of the Atlas-3D and NGVS projects. State of the art numerical simulations are used to interpret the data. The images reveal a wealth of unknown faint structures at levels as faint as 29 mag arcsec-2 in the g-band. Initial results for two galaxies are presented here., Comment: 4 pages, 3 figures, proceedings of the IAU Symposium 277, tracing the ancestry of galaxies

Published
2011
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4. Formation of slowly rotating early-type galaxies via major mergers: a Resolution Study

Author

Bois, M., Bournaud, F., Emsellem, E., Alatalo, K., Blitz, L., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Duc, P. -A., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y., McDermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., Weijmans, A., and Young, L. M.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We study resolution effects in numerical simulations of gas-rich and gas-poor major mergers, and show that the formation of slowly-rotating elliptical galaxies often requires a resolution that is beyond the present-day standards to be properly modelled. Our sample of equal-mass merger models encompasses various masses and spatial resolutions, ranging from about 200pc and 10^5 particles per component, typical of some recently published major merger simulations, to up to 32pc and 10^3 M_sun in simulations using 2.4 x 10^7 collisionless particles and 1.2 x 10^7 gas particles, among the highest resolutions reached so far for gas-rich major merger of massive disc galaxies. We find that the formation of fast-rotating early-type galaxies, that are flattened by a significant residual rotation, is overall correctly reproduced at all such resolutions. However, the formation of slow-rotating early-type galaxies, which have a low residual angular momentum and are supported mostly by anisotropic velocity dispersions, is strongly resolution-dependent. The evacuation of angular momentum from the main stellar body is largely missed at standard resolution, and systems that should be slow rotators are then found to be fast rotators. The effect is most important for gas-rich mergers, but is also witnessed in mergers with an absent or modest gas component. The effect is robust with respect to our initial conditions and interaction orbits, and originates in the physical treatment of the relaxation process during the coalescence of the galaxies. Our findings show that a high-enough resolution is required to accurately model the global properties of merger remnants and the evolution of their angular momentum. The role of gas-rich mergers of spiral galaxies in the formation of slow-rotating ellipticals may therefore have been underestimated., Comment: Accepted by MNRAS, 16 pages, 14 figures. Resolutions of the figures have been significantly reduced.

Published
2010
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5. Scaling relations in early-type galaxies from integral-field stellar kinematics

Author

Cappellari, M., Scott, N., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Emsellem, E., Falcon-Barroso, J., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y., McDermid, R. M., Morganti, R., Naab, T., Sarzi, M., Serra, P., Bosch, R. C. E. van den, van de Ven, G., Weijmans, A., and Young, L. M.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We study the origin of the scaling relations of early-type galaxies (ETGs) by constructing detailed models of the stellar dynamics for the K-band selected, volume-limited ATLAS3D sample of 263 nearby ETGs, spanning a large range of masses and stellar velocity dispersions (60 < sigma < 350 km/s)., Comment: 1 page, no figures, LaTeX. Invited talk to Joint Discussion 01 "Dark Matter in Early-Type Galaxies". To appear in Highlights of Astronomy, Vol. 15, Proc. of the XXVIIth IAU General Assembly, Rio de Janeiro, Brazil, August 2009, eds. L. V. E. Koopmans & T. Treu, Cambridge University Press

Published
2009
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7. A probabilistic approach to emission-line galaxy classification

Author

Souza, R.S. de, Dantas, M.L.L., Costa-Duarte, M.V., Feigelson, E.D., Killedar, M., Lablanche, P.-Y., Beck, R., Gieseke, F., Souza, R.S. de, Dantas, M.L.L., Costa-Duarte, M.V., Feigelson, E.D., Killedar, M., Lablanche, P.-Y., Beck, R., and Gieseke, F.

Abstract

Contains fulltext : 184202.pdf (publisher's version ) (Open Access)

Published
2017

8. Simulations of Binary Galaxy Mergers and the Link with Fast Rotators, Slow Rotators, and Kinematically Distinct Cores

Author

Bois, M., Emsellem, E., Bournaud, F., Alatalo, K., Blitz, L., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Duc, P. -A, Khochfar, S., Krajnović, D, Thomas, D., Kuntschner, H., Lablanche, P. -Y, McDermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., Weijmans, A. -M, Young, L. M., Sun, W. -H, Xu, C. K., Scoville, N. Z., Sanders, D. B., and Astronomy

Subjects
Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We study the formation of early-type galaxies (ETGs) through mergers with a sample of 70 high-resolution numerical simulations of binary mergers of disc galaxies. These simulations encompass various mass ratios, initial conditions and orbital parameters. We find that binary mergers of disc galaxies with mass ratios of 3:1 and 6:1 are nearly always classified as Fast Rotators according to the ATLAS3D criterion: they preserve the structure of the input fast rotating spiral progenitors. Major disc mergers (mass ratios of 2:1 and 1:1) lead to both Fast and Slow Rotators. Most of the Slow Rotators hold a stellar Kinematically Distinct Core (KDC) in their 1-3 central kilo-parsec: these KDCs are built from the stellar components of the progenitors. The mass ratio of the progenitors is a fundamental parameter for the formation of Slow Rotators in binary mergers, but it also requires a retrograde spin for the progenitor galaxies with respect to the orbital angular momentum. The importance of the initial spin of the progenitors is also investigated in the library of galaxy mergers of the GalMer project.

Published
2013

9. Probing the mass assembly of massive nearby galaxies with deep imaging

Author

Duc, P. -A, Cuillandre, J. -C, Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Cappellari, M., Côté, P., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Emsellem, E., Ferrarese, L., Ferriere, E., Gwyn, S., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y, McDermid, R. M., Michel-Dansac, L., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., Weijmans, A., Young, L. M., Thomas, Daniel, Pasquali, Anna, Ferreras, Ignacio, and Astronomy

Subjects
Physics, Effective radius, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Stellar mass, FOS: Physical sciences, Perturbation (astronomy), Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy, Redshift, Accretion (astrophysics), cD, Space and Planetary Science, galaxies: interactions, Astrophysics::Solar and Stellar Astrophysics, Surface brightness, Halo, Astrophysics::Earth and Planetary Astrophysics, galaxies: elliptical and lenticular, galaxies: evolution, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

According to a popular scenario supported by numerical models, the mass assembly and growth of massive galaxies, in particular the Early-Type Galaxies (ETGs), is, below a redshift of 1, mainly due to the accretion of multiple gas-poor satellites. In order to get observational evidence of the role played by minor dry mergers, we are obtaining extremely deep optical images of a complete volume limited sample of nearby ETGs. These observations, done with the CFHT as part of the ATLAS3D, NGVS and MATLAS projects, reach a stunning 28.5 - 29 mag.arcsec-2 surface brightness limit in the g' band. They allow us to detect the relics of past collisions such as faint stellar tidal tails as well as the very extended stellar halos which keep the memory of the last episodes of galactic accretion. Images and preliminary results from this on-going survey are presented, in particular a possible correlation between the fine structure index (which parametrizes the amount of tidal perturbation) of the ETGs, their stellar mass, effective radius and gas content., International Astronomical Union Symposium 295: The intriguing life of massive galaxies, August 27-31, 2012, Beijing, China

Published
2012

10. ATLAS3D project. IV. (Young+, 2011)

Author

Young, L. M., Bureau, M., Davis, T. A., Combes, F., McDermid, R. M., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Cappellari, M., Davies, R. L., de Zeeuw, P. T., Emsellem, E., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y, Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., Weijmans, A. -M, and Astronomy

Subjects
Surveys, Carbon monoxide, Galaxy catalogs, Spectroscopy
Abstract

The IRAM 30-m telescope at Pico Veleta, Spain, was used for simultaneous observations of the 12CO(1-0) and (2-1) emission during 2007 July, 2008 March and 2008 November. (2 data files).

Published
2012

11. Early-type Galaxies in Isolation: An HI Perspective with ATLAS 3D

Author

Serra, P., Morganti, R., Oosterloo, T. A., Alatalo, K., Blitz, L., Bois, M., van den Bosch, R. C. E., Bournaud, F., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., Duc, P., Emsellem, E., Falcón-Barroso, J., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. Y., McDermid, R. M., Naab, T., Sarzi, M., Scott, N., de Ven, G., Weijmans, A., Young, L. M., de Zeeuw, P. T., Verder-Montenegro, L., del Olmo, A., Sulentic, J., and Kapteyn Astronomical Institute

Abstract

We present preliminary results of our HI WSRT observations of early-type galaxies in the ATLAS3D sample. We discuss the dependence of HI properties on environment. We detect HI in about half of the galaxies outside the Virgo cluster. The HI morphology/kinematics changes as a function of environment, going from regular, rotating systems around “isolated” galaxies to progressively more disturbed structures for galaxies with neighbours or in groups. In denser environment, inside Virgo, nearly none of the galaxies contains HI.

Published
2010

12. Early-type Galaxies in Isolation: an H I Perspective with ATLAS(3D)

Author

Serra, P., Morganti, R., Tom Oosterloo, Alatalo, K., Blitz, L., Bois, M., Den Bosch, R. C. E., Bournaud, F., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., Duc, P., Emsellem, E., Falcon-Barroso, J., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. Y., Mcdermid, R. M., Naab, T., Sarzi, M., Scott, N., Ven, G., Weijmans, A., Young, L. M., and Zeeuw, P. T.

Published
2010

13. The Atlas3D project -- I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria

Author

Cappellari, M, Emsellem, E, Krajnovic, D, McDermid, RM, Scott, N, Kleijn, GAV, Young, LM, Alatalo, K, Bacon, R, Blitz, L, Bois, M, Bournaud, F, Bureau, M, Davies, RL, Davis, TA, de Zeeuw, PT, Duc, P-A, Khochfar, S, Kuntschner, H, Lablanche, P-Y, Morganti, R, Naab, T, Oosterloo, T, Sarzi, M, Serra, P, and Weijmans, A-M

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The Atlas3D project is a multi-wavelength survey combined with a theoretical modeling effort. The observations span from the radio to the millimeter and optical, and provide multi-colour imaging, two-dimensional kinematics of the atomic (HI), molecular (CO) and ionized gas (Hbeta, [OIII] and [NI]), together with the kinematics and population of the stars (Hbeta, Fe5015 and Mgb), for a carefully selected, volume-limited (1.16*10^5 Mpc^3) sample of 260 early-type (elliptical E and lenticular S0) galaxies (ETGs). The models include semi-analytic, N-body binary mergers and cosmological simulations of galaxy formation. Here we present the science goals for the project and introduce the galaxy sample and the selection criteria. The sample consists of nearby (D6*10^9 M_Sun). We analyze possible selection biases and we conclude that the parent sample is essentially complete and statistically representative of the nearby galaxy population. We present the size-luminosity relation for the spirals and ETGs and show that the ETGs in the Atlas3D sample define a tight red sequence in a colour-magnitude diagram, with few objects in the transition from the blue cloud. We describe the strategy of the SAURON integral-field observations and the extraction of the stellar kinematics with the pPXF method. We give an overview of the characteristics of the other main datasets already available for our sample and of the ongoing modelling projects., Comment: 27 pages, 11 figures, LaTeX. Accepted for publication in MNRAS

Published
2010
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14. Revealing the origin of the cold ISM in massive early-type galaxies

Author

Davis, T. A., primary, Alatalo, K., additional, Bureau, M., additional, Young, L., additional, Blitz, L., additional, Crocker, A., additional, Bayet, E., additional, Bois, M., additional, Bournaud, F., additional, Cappellari, M., additional, Davies, R. L., additional, Duc, P-A., additional, de Zeeuw, P. T., additional, Emsellem, E., additional, Falcon-Barroso, J., additional, Khochfar, S., additional, Krajnovic, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, and Weijmans, A., additional

Published
2012
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15. Spatially resolved molecular gas in early-type galaxies

Author

Davis, T. A., primary, Alatalo, K., additional, Bureau, M., additional, Young, L., additional, Blitz, L., additional, Crocker, A., additional, Bayet, E., additional, Bois, M., additional, Bournaud, F., additional, Cappellari, M., additional, Davies, R. L., additional, Duc, P-A., additional, de Zeeuw, P. T., additional, Emsellem, E., additional, Falcon-Barroso, J., additional, Khochfar, S., additional, Krajnovic, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, and Weijmans, A., additional

Published
2012
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16. DISCOVERY OF AN ACTIVE GALACTIC NUCLEUS DRIVEN MOLECULAR OUTFLOW IN THE LOCAL EARLY-TYPE GALAXY NGC 1266

Author

Alatalo, K., primary, Blitz, L., additional, Davis, T. A., additional, Bureau, M., additional, Lopez, L. A., additional, Cappellari, M., additional, Scott, N., additional, Shapiro, K. L., additional, Crocker, A. F., additional, Martín, S., additional, Bois, M., additional, Bournaud, F., additional, Davies, R. L., additional, de Zeeuw, P. T., additional, Duc, P.-A., additional, Emsellem, E., additional, Falcón-Barroso, J., additional, Khochfar, S., additional, Krajnović, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Oosterloo, T., additional, Sarzi, M., additional, Serra, P., additional, and Weijmans, A., additional

Published
2011
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17. Molecular Gas and Star Formation in Local Early–type Galaxies

Author

Bureau, M., primary, Davis, T. A., additional, Alatalo, K., additional, Crocker, A. F., additional, Blitz, L., additional, Young, L. M., additional, Combes, F., additional, Bois, M., additional, Bournaud, F., additional, Cappellari, M., additional, Davies, R. L., additional, de Zeeuw, P. T., additional, Duc, P.-A., additional, Emsellem, E., additional, Khochfar, S., additional, Krajnović, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Oosterloo, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, and Weijmans, A., additional

Published
2010
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18. Investigating the Merger Origin of Early-type Galaxies using Ultra-deep Optical Images

Author

Duc, P.-A., primary, Cuillandre, J.-C., additional, Alatalo, K., additional, Blitz, L., additional, Bois, M., additional, Bournaud, F., additional, Bureau, M., additional, Cappellari, M., additional, Côté, P., additional, Davies, R. L., additional, Davis, T. A., additional, de Zeeuw, P. T., additional, Emsellem, E., additional, Ferrarese, L., additional, Ferriere, E., additional, Gwyn, S., additional, Khochfar, S., additional, Krajnovic, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, MacArthur, L., additional, McDermid, R. M., additional, Michel-Dansac, L., additional, Morganti, R., additional, Naab, T., additional, Oosterloo, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, Weijmans, A., additional, and Young, L. M., additional

Published
2010
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19. Formation of slowly rotating early-type galaxies via major mergers: a resolution study

Author

Bois, M., primary, Bournaud, F., additional, Emsellem, E., additional, Alatalo, K., additional, Blitz, L., additional, Bureau, M., additional, Cappellari, M., additional, Davies, R. L., additional, Davis, T. A., additional, de Zeeuw, P. T., additional, Duc, P.-A., additional, Khochfar, S., additional, Krajnović, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Oosterloo, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, Weijmans, A., additional, and Young, L. M., additional

Published
2010
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20. The ATLAS[sup 3D] Project: A Paradigm Shift for Early-Type Galaxies

Author

Emsellem, E., primary, Alatalo, K., additional, Blitz, L., additional, Bois, M., additional, Bournaud, F., additional, Bureau, M., additional, Cappellari, M., additional, Davies, R. L., additional, Davis, T. A., additional, de Zeeuw, P. T., additional, Khochfar, S., additional, Krajnović, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Oosterloo, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, Weijmans, A., additional, Young, L. M., additional, Debattista, Victor P., additional, and Popescu, C. C., additional

Published
2010
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21. Formation of Slowly Rotating Elliptical Galaxies in Major Mergers. A Resolution Study

Author

Bois, M., primary, Bournaud, F., additional, Emsellem, E., additional, Alatalo, K., additional, Blitz, L., additional, Bureau, M., additional, Cappellari, M., additional, Davies, R. L., additional, Davis, T. A., additional, de Zeeuw, P. T., additional, Falcón-Barroso, J., additional, Khochfar, S., additional, Krajnović, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Sarzi, M., additional, Scott, N., additional, Serra, P., additional, van den Bosch, R. C. E., additional, van de Ven, G., additional, Weijmans, A., additional, Young, L. M., additional, Debattista, Victor P., additional, and Popescu, C. C., additional

Published
2010
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22. Scaling relations in early-type galaxies from integral-field stellar kinematics

Author

Cappellari, M., primary, Scott, N., additional, Alatalo, K., additional, Blitz, L., additional, Bois, M., additional, Bournaud, F., additional, Bureau, M., additional, Davies, R. L., additional, Davis, T. A., additional, de Zeeuw, P. T., additional, Emsellem, E., additional, Falcon-Barroso, J., additional, Khochfar, S., additional, Krajnovic, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, McDermid, R. M., additional, Morganti, R., additional, Naab, T., additional, Sarzi, M., additional, Serra, P., additional, van den Bosch, R. C. E., additional, van de Ven, G., additional, Weijmans, A., additional, and Young, L. M., additional

Published
2009
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23. Stellar populations of early-type galaxies in the ATLAS[sup 3D] sample

Author

Serra, P., primary, McDermid, R. M., additional, Alatalo, K., additional, Blitz, L., additional, Bois, M., additional, Bournaud, F., additional, Bureau, M., additional, Cappellari, M., additional, Davies, R. L., additional, Davis, T. A., additional, de Zeeuw, P. T., additional, Emsellem, E., additional, Falcón-Barroso, J., additional, Khochfar, S., additional, Krajnović, D., additional, Kuntschner, H., additional, Lablanche, P.-Y., additional, Morganti, R., additional, Naab, T., additional, Sarzi, M., additional, Scott, N., additional, van den Bosch, R. C. E., additional, van de Ven, G., additional, Weijmans, A., additional, Young, L. M., additional, Giobbi, Giuliana, additional, Tornambe, Amedeo, additional, Raimondo, Gabriella, additional, Limongi, Marco, additional, Antonelli, L. A., additional, Menci, Nicola, additional, and Brocato, Enzo, additional

Published
2009
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24. The ATLAS3D Project: A Paradigm Shift for Early-Type Galaxies.

Author

Emsellem, E., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Khochfar, S., Krajnović, D., Kuntschner, H., Lablanche, P.-Y., McDermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., and Scott, N.

Subjects
GALAXIES, ASTRONOMY, SPECTRUM analysis, ASTRONOMICAL photometry, COMPUTER simulation
Abstract

In this short paper, we present a few preliminary results from the ambitious ATLAS3D project, which intends to probe the first volume-limited sample of early-type galaxies observed via multi-band photometry, integral-field spectroscopy, radio and millimeter observations, and supported by a large library of numerical simulations and models. We more specifically address the existence of two main families of early-type galaxies, the slow and fast rotators. [ABSTRACT FROM AUTHOR]

Published
2010
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25. Stellar populations of early-type galaxies in the ATLAS3D sample.

Author

Serra, P., McDermid, R. M., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Emsellem, E., Falcón-Barroso, J., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P.-Y., Morganti, R., Naab, T., and Sarzi, M.

Subjects
STELLAR populations, GALAXY formation, KINEMATICS, ATMOSPHERIC density, SPECTRUM analysis
Abstract

ATLAS3D is a multi-wavelength, volume-limited survey of 263 morphologically-selected early-type galaxies within a distance of 42 Mpc and complete to MK<=-21.5. Here we present the ATLAS3D project and our first results on the stellar populations of galaxies in the ATLAS3D sample based on SAURON integral-field spectroscopy. We show relations between integrated line-strength indices and stellar velocity dispersion σ in the range 55<=σ(km/s)<=350. We derive simple-stellar-population-equivalent age, metallicity and α/Fe abundance ratio and discuss their relation to stellar velocity dispersion, environment and galaxy internal kinematics. These preliminary results indicate that slow rotators tend to be older and have less variation in age than fast rotators. We also find that galaxies in lower density environments are on average younger than those in denser environments, as found by other authors. [ABSTRACT FROM AUTHOR]

Published
2009
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26. Probing the mass assembly of massive nearby galaxies with deep imaging.

Author

Duc, P.–A., Cuillandre, J.-C., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Cappellari, M., Côté, P., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Emsellem, E., Ferrarese, L., Ferriere, E., Gwyn, S., Khochfar, S., Krajnovic, D., Kuntschner, H., and Lablanche, P.-Y.

Abstract

According to a popular scenario supported by numerical models, the mass assembly and growth of massive galaxies, in particular the Early-Type Galaxies (ETGs), is, below a redshift of 1, mainly due to the accretion of multiple gas–poor satellites. In order to get observational evidence of the role played by minor dry mergers, we are obtaining extremely deep optical images of a complete volume limited sample of nearby ETGs. These observations, done with the CFHT as part of the ATLAS3D, NGVS and MATLAS projects, reach a stunning 28.5 – 29 mag.arcsec−2 surface brightness limit in the g' band. They allow us to detect the relics of past collisions such as faint stellar tidal tails as well as the very extended stellar halos which keep the memory of the last episodes of galactic accretion. Images and preliminary results from this on-going survey are presented, in particular a possible correlation between the fine structure index (which parametrizes the amount of tidal perturbation) of the ETGs, their stellar mass, effective radius and gas content. [ABSTRACT FROM PUBLISHER]

Published
2013
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27. Revealing the origin of the cold ISM in massive early-type galaxies.

Author

Davis, T. A., Alatalo, K., Bureau, M., Young, L., Blitz, L., Crocker, A., Bayet, E., Bois, M., Bournaud, F., Cappellari, M., Davies, R. L., Duc, P-A., de Zeeuw, P. T., Emsellem, E., Falcon-Barroso, J., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P.-Y., and McDermid, R. M.

Abstract

Recently, massive early-type galaxies have shed their red-and-dead moniker, thanks to the discovery that many host residual star formation. As part of the ATLAS-3D project, we have conducted a complete, volume-limited survey of the molecular gas in 260 local early-type galaxies with the IRAM-30m telescope and the CARMA interferometer, in an attempt to understand the fuel powering this star formation. We find that around 22% of early-type galaxies in the local volume host molecular gas reservoirs. This detection rate is independent of galaxy luminosity and environment. Here we focus on how kinematic misalignment measurements and gas-to-dust ratios can be used to put constraints on the origin of the cold ISM in these systems. The origin of the cold ISM seems to depend strongly on environment, with misaligned, dust poor gas (indicative of externally acquired material) being common in the field but completely absent in rich groups and in the Virgo cluster. Very massive galaxies also appear to be devoid of accreted gas. This suggests that in the field mergers and/or cold gas accretion dominate the gas supply, while in clusters internal secular processes become more important. This implies that environment has a strong impact on the cold gas properties of ETGs. [ABSTRACT FROM PUBLISHER]

Published
2013
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28. VizieR Online Data Catalog: ATLAS3D project. I. (Cappellari+, 2011)

Author

Cappellari, M., Emsellem, E., Krajnovic, D., Mcdermid, R. M., Scott, N., Verdoes Kleijn, G. A., Young, L. M., Alatalo, K., Bacon, R., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., Zeeuw, P. T., Duc, P. -A, Khochfar, S., Harald Kuntschner, Lablanche, P. -Y, Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Serra, P., and Weijmans, A. -M

29. VizieR Online Data Catalog: ATLAS3D project. VII. (Cappellari+, 2011)

Author

Cappellari, M., Emsellem, E., Krajnovic, D., McDermid, R. M., Serra, P., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., Zeeuw, P. T., Khochfar, S., Harald Kuntschner, Lablanche, P. -Y, Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Weijmans, A. -M, and Young, L. M.

31. VizieR Online Data Catalog: ATLAS3D project. III. (Emsellem+, 2011)

Author

Emsellem, E., Michele Cappellari, Krajnovic, D., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., 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., Ven, G., Weijmans, A. -M, and Young, L. M.

32. ATLAS3D project. I. (Cappellari+, 2011)

Author

Cappellari, M., Emsellem, E., Krajnovic, D., McDermid, R. M., Scott, N., Verdoes Kleijn, G. A., Young, L. M., Alatalo, K., Bacon, R., Blitz, L., Bois, M., Bournaud, F., Bureau, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Duc, P. -A, Khochfar, S., Kuntschner, H., Lablanche, P. -Y, Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Serra, P., Weijmans, A. -M, and Astronomy

Subjects
Photometry, Radial velocities, Surveys, Galaxy catalogs
Abstract

The ATLAS3D sample includes all nearby ETGs observable fr northern Earth hemisphere, and for this reason we hope its homogeneous data set will ultimately constitute a legacy for future studies. We trust that our and other groups will exploit our data and sample well beyond what we had originally envisioned. Our first steps in the directions outlined above are presented in the following papers, while the other aspects will be presented in subsequent papers of this series.

33. VizieR Online Data Catalog: ATLAS3D project. IV. (Young+, 2011)

Author

Young, L. M., Bureau, M., Davis, T. A., Combes, F., Mcdermid, R. M., Alatalo, K., Blitz, L., Bois, M., Bournaud, F., Michele Cappellari, Davies, R. L., Zeeuw, P. T., Emsellem, E., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P. -Y, Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., and Weijmans, A. -M

34. The impact of bars on axisymmetric modelling of galaxies

Author

Lablanche, P. -Y, Cappellari, M., Emsellem, E., Bournaud, F., Michel-Dansac, L., Alatalo, K., Blitz, L., Bois, M., Bureau, M., Davies, R. L., Davis, T. A., Zeeuw, T., Duc, P. -A, Khochfar, S., Krajnovic, D., Kuntschner, H., Mcdermid, R. M., Morganti, R., Naab, T., Oosterloo, T., Sarzi, M., Scott, N., Serra, P., Anne-Marie Weijmans, and Young, L. M.

35. Formation of Slowly Rotating Elliptical Galaxies in Major Mergers. A Resolution Study.

Author

Bois, M., Bournaud, F., Emsellem, E., Alatalo, K., Blitz, L., Bureau, M., Cappellari, M., Davies, R. L., Davis, T. A., de Zeeuw, P. T., Falcón-Barroso, J., Khochfar, S., Krajnovic, D., Kuntschner, H., Lablanche, P.-Y., McDermid, R. M., Morganti, R., Naab, T., Sarzi, M., and Scott, N.

Subjects
ELLIPTICAL galaxies, SPIRAL galaxies, ANGULAR momentum (Mechanics), COMPUTER simulation, ASTRONOMY
Abstract

We study resolution effects in numerical simulations of gas-rich (20% of the total baryonic mass) major mergers, and show that the formation of slowly-rotating elliptical galaxies requires a resolution that is beyond the present-day standards to be properly modelled. Our findings show that a high-enough resolution is required to accurately model the global properties of merger remnants and the evolution of their angular momentum. The role of wet mergers of spiral galaxies in the formation of slow-rotating ellipticals may therefore have been underestimated. [ABSTRACT FROM AUTHOR]

Published
2010
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