Alatalo, Katherine

Blitz, Leo

Bournaud, Frédéric

Bureau, Martin

Cappellari, Michele

Crocker, Alison F.

Davies, Roger L.

Davis, Timothy A.

de Zeeuw, P.T.

Duc, Pierre-Alain

Emsellem, Eric

Khochfar, Sadegh

Krajnović, Davor

Kuntschner, Harald

McDermid, Richard M.

Morganti, Raffaella

Naab, Thorsten

Oosterloo, Tom

Sarzi, Marc

Scott, Nicholas

Serra, Paolo

Weijmans, Anne-Marie

Young, Lisa M.

Monthly Notices of the Royal Astronomical Society

arXiv

We present the stellar population content of early-type galaxies from the ATLAS3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral fitting to derive non-parametric star formation histories, mass-weighted average values of age, metallicity, and half-mass formation time-scales. Using homogeneously derived effective radii and dynamically determined galaxy masses, we present the distribution of stellar population parameters on the Mass Plane (MJAM, σe, R^maj_e), showing that at fixed mass, compact early-type galaxies are on average older, more metal-rich, and more alpha-enhanced than their larger counterparts. From non-parametric star formation histories, we find that the duration of star formation is systematically more extended in lower mass objects. Assuming that our sample represents most of the stellar content of today's local Universe, approximately 50 per cent of all stars formed within the first 2 Gyr following the big bang. Most of these stars reside today in the most massive galaxies (&gt;1010.5 M⊙), which themselves formed 90 per cent of their stars by z ˜ 2. The lower mass objects, in contrast, have formed barely half their stars in this time interval. Stellar population properties are independent of environment over two orders of magnitude in local density, varying only with galaxy mass. In the highest density regions of our volume (dominated by the Virgo cluster), galaxies are older, alpha-enhanced, and have shorter star formation histories with respect to lower density regions

de Zeeuw, P. T.

ARTS repository - University of Groningen

English

The ATLAS3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies

We present the stellar population content of early-type galaxies from the ATLAS3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral fitting to derive non-parametric star formation histories, mass-weighted average values of age, metallicity, and half-mass formation time-scales. Using homogeneously derived effective radii and dynamically determined galaxy masses, we present the distribution of stellar population parameters on the Mass Plane (MJAM, σe, Rmaje), showing that at fixed mass, compact early-type galaxies are on average older, more metal-rich, and more alpha-enhanced than their larger counterparts. From non-parametric star formation histories, we find that the duration of star formation is systematically more extended in lower mass objects. Assuming that our sample represents most of the stellar content of today's local Universe, approximately 50 per cent of all stars formed within the first 2 Gyr following the big bang. Most of these stars reside today in the most massive galaxies (>10¹⁰·⁵ M⊙), which themselves formed 90 per cent of their stars by z ∼ 2. The lower mass objects, in contrast, have formed barely half their stars in this time interval. Stellar population properties are independent of environment over two orders of magnitude in local density, varying only with galaxy mass. In the highest density regions of our volume (dominated by the Virgo cluster), galaxies are older, alpha-enhanced, and have shorter star formation histories with respect to lower density regions.30 page(s

McDermid, Richard M

Young, Lisa M

Crocker, Alison F

Davies, Roger L

Davis, Timothy A

de Zeeuw, P. T

Macquarie University ResearchOnline

Dissertations of the University of Groningen

We present the stellar population content of early-type galaxies from the ATLAS3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral fitting to derive non-parametric star formation histories, mass-weighted average values of age, metallicity, and half-mass formation time-scales. Using homogeneously derived effective radii and dynamically determined galaxy masses, we present the distribution of stellar population parameters on the Mass Plane (MJAM, σe, Rmaje), showing that at fixed mass, compact early-type galaxies are on average older, more metal-rich, and more alpha-enhanced than their larger counterparts. From non-parametric star formation histories, we find that the duration of star formation is systematically more extended in lower mass objects. Assuming that our sample represents most of the stellar content of today's local Universe, approximately 50 per cent of all stars formed within the first 2 Gyr following the big bang. Most of these stars reside today in the most massive galaxies (&gt;1010.5 M⊙), which themselves formed 90 per cent of their stars by z ∼ 2. The lower mass objects, in contrast, have formed barely half their stars in this time interval. Stellar population properties are independent of environment over two orders of magnitude in local density, varying only with galaxy mass. In the highest density regions of our volume (dominated by the Virgo cluster), galaxies are older, alpha-enhanced, and have shorter star formation histories with respect to lower density regions.</p

Bournaud, Frederic

Krajnovic, Davor

University of St. Andrews - Pure

The Atlas<sup>3D</sup> Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies

We present the stellar population content of early-type galaxies from the ATLAS3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral fitting to derive non-parametric star formation histories, mass-weighted average values of age, metallicity, and half-mass formation time-scales. Using homogeneously derived effective radii and dynamically determined galaxy masses, we present the distribution of stellar population parameters on the Mass Plane (MJAM, σe, R^maj_e), showing that at fixed mass, compact early-type galaxies are on average older, more metal-rich, and more alpha-enhanced than their larger counterparts. From non-parametric star formation histories, we find that the duration of star formation is systematically more extended in lower mass objects. Assuming that our sample represents most of the stellar content of today's local Universe, approximately 50 per cent of all stars formed within the first 2 Gyr following the big bang. Most of these stars reside today in the most massive galaxies (>1010.5 M⊙), which themselves formed 90 per cent of their stars by z ˜ 2. The lower mass objects, in contrast, have formed barely half their stars in this time interval. Stellar population properties are independent of environment over two orders of magnitude in local density, varying only with galaxy mass. In the highest density regions of our volume (dominated by the Virgo cluster), galaxies are older, alpha-enhanced, and have shorter star formation histories with respect to lower density regions

NARCIS 

Proceedings - University of Groningen

Richard M. McDermid

Katherine Alatalo

Leo Blitz

Frédéric Bournaud

Martin Bureau

Michele Cappellari

Alison F. Crocker

Roger L. Davies

Timothy A. Davis

P. T. de Zeeuw

Pierre-Alain Duc

Eric Emsellem

Sadegh Khochfar

Davor Krajnović

Harald Kuntschner

Raffaella Morganti

Thorsten Naab

Tom Oosterloo

Marc Sarzi

Nicholas Scott

Paolo Serra

Anne-Marie Weijmans

Lisa M. Young

Crossref

The ATLAS3D Project – XXX. Star formation histories and stellar population scaling relations of early-type galaxies

A&A, 518, A10

Galactic Dynamics, 2nd edn.

MNRAS, 418, L74 de Zeeuw

The ATLAS3D project - XXX : Star formation histories and stellar population scaling relations of early-type galaxies

The ATLAS3D project - XXX : Star formation histories and stellar population scaling relations of early-type galaxies

Abstract

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ARTS repository - University of Groningen

Macquarie University ResearchOnline

Dissertations of the University of Groningen

University of St. Andrews - Pure

NARCIS

ARTS repository - University of Groningen

Proceedings - University of Groningen

Crossref