Strong size evolution of the most massive galaxies since z~2

Details Strong size evolution of the most massive galaxies since z~2 Strong size evolution of the most massive galaxies since z~2

2007-09-05

arxiv.org/abs/0709.0621v1

Mon.Not.Roy.Astron.Soc.382:109-120,2007

Astronomy and Astrophysics

Astrophysics

MNRAS in press, 13 pages, 11 figures. Data Table will be published in its integrity in the MNRAS online version

Scientific paper

10.1111/j.1365-2966.2007.12388.x

Using the combined capabilities of the large near-infrared Palomar/DEEP-2 survey, and the superb resolution of the ACS HST camera, we explore the size evolution of 831 very massive galaxies (M*>10^{11}h_{70}^{-2}M_sun) since z~2. We split our sample according to their light concentration using the Sersic 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.

Affiliated with

Also associated with

No associations

Rating

Strong size evolution of the most massive galaxies since z~2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Strong size evolution of the most massive galaxies since z~2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strong size evolution of the most massive galaxies since z~2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-470301