Strong size evolution of the most massive galaxies since z ∼ 2
Identifieur interne : 000211 ( Main/Exploration ); précédent : 000210; suivant : 000212Strong size evolution of the most massive galaxies since z ∼ 2
Auteurs : Ignacio Trujillo [Espagne] ; C. J. Conselice ; Kevin Bundy [Canada] ; M. C. Cooper [États-Unis] ; P. Eisenhardt [États-Unis] ; Richard S. Ellis [États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2007-11-21.
Abstract
Using the combined capabilities of the large near-infrared Palomar/DEEP-2 survey, and the superb resolution of the Advanced Camera for Surveys HST camera, we explore the size evolution of 831 very massive galaxies (M⋆≥ 1011h−270 M⊙) since z∼ 2. We split our sample according to their light concentration using the Sérsic index n. At a given stellar mass, both low (n < 2.5) and high (n > 2.5) concentrated objects were much smaller in the past than their local massive counterparts. This evolution is particularly strong for the highly concentrated (spheroid like) objects. At z∼ 1.5, massive spheroid-like objects were a factor of 4 (±0.4) smaller (i.e. almost two orders of magnitudes denser) than those we see today. These small sized, high-mass galaxies do not exist in the nearby Universe, suggesting that this population merged with other galaxies over several billion years to form the largest galaxies we see today.
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DOI: 10.1111/j.1365-2966.2007.12388.x
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We split our sample according to their light concentration using the Sérsic index n. At a given stellar mass, both low (n < 2.5) and high (n > 2.5) concentrated objects were much smaller in the past than their local massive counterparts. This evolution is particularly strong for the highly concentrated (spheroid like) objects. At z∼ 1.5, massive spheroid-like objects were a factor of 4 (±0.4) smaller (i.e. almost two orders of magnitudes denser) than those we see today. These small sized, high-mass galaxies do not exist in the nearby Universe, suggesting that this population merged with other galaxies over several billion years to form the largest galaxies we see today.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Espagne</li><li>États-Unis</li></country><region><li>Ontario</li></region><settlement><li>Toronto</li></settlement><orgName><li>Université de Toronto</li></orgName></list><tree><noCountry><name sortKey="Conselice, C J" sort="Conselice, C J" uniqKey="Conselice C" first="C. J." last="Conselice">C. J. Conselice</name></noCountry><country name="Espagne"><noRegion><name sortKey="Trujillo, Ignacio" sort="Trujillo, Ignacio" uniqKey="Trujillo I" first="Ignacio" last="Trujillo">Ignacio Trujillo</name></noRegion></country><country name="Canada"><region name="Ontario"><name sortKey="Bundy, Kevin" sort="Bundy, Kevin" uniqKey="Bundy K" first="Kevin" last="Bundy">Kevin Bundy</name></region></country><country name="États-Unis"><noRegion><name sortKey="Cooper, M C" sort="Cooper, M C" uniqKey="Cooper M" first="M. C." last="Cooper">M. C. Cooper</name></noRegion><name sortKey="Eisenhardt, P" sort="Eisenhardt, P" uniqKey="Eisenhardt P" first="P." last="Eisenhardt">P. Eisenhardt</name><name sortKey="Ellis, Richard S" sort="Ellis, Richard S" uniqKey="Ellis R" first="Richard S." last="Ellis">Richard S. Ellis</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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