2009ApJ...692L.118T

Query : 2009ApJ...692L.118T

2009ApJ...692L.118T - Astrophys. J., 692, L118-L122 (2009/February-3)

Superdense massive galaxies in the nearby universe.

TRUJILLO I., CENARRO A.J., DE LORENZO-CACERES A., VAZDEKIS A., DE LA ROSA I.G. and CAVA A.

Abstract (from CDS):

Superdense massive galaxies (re∼ 1 kpc; M ∼ 1011 M{x2609}) were common in the early universe (z ≳ 1.5). Within some hierarchical merging scenarios, a non-negligible fraction (1%-10%) of these galaxies is expected to survive since that epoch, retaining their compactness and presenting old stellar populations in the present universe. Using the NYU Value-Added Galaxy Catalog from the Sloan Digital Sky Survey Data Release 6, we find only a tiny fraction of galaxies (∼0.03%) with re≲ 1.5 kpc and M{sstarf} ≳ 8x1010 M{x2609} in the local universe (z < 0.2). Surprisingly, they are relatively young (∼2 Gyr) and metal-rich ([Z/H] ∼0.2). The consequences of these findings within the current two competing size evolution scenarios for the most massive galaxies ("dry" mergers vs. "puffing up" due to quasar activity) are discussed.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: fundamental parameters - galaxies: peculiar - galaxies: photometry - galaxies: structure

Nomenclature: Table 1: [TCD2009] NYU NNNNNNN N=29 among (Nos 54829-2434587).

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [TCD2009] NYU 1689914 G 03 14 06.3857993976 +00 10 23.102752044           ~ 1 0
2 [TCD2009] NYU 411130 G 08 29 27.8217722448 +46 13 31.436184972           ~ 1 0
3 [TCD2009] NYU 986020 G 08 39 17.4394873512 +30 37 45.885622296           ~ 1 0
4 SDSS J090324.19+022645.3 G 09 03 24.1903924416 +02 26 45.335617332           ~ 9 0
5 SDSS J091534.74+255606.2 G 09 15 34.7487448704 +25 56 06.246896568           ~ 3 0
6 SDSS J091926.44+065321.4 G 09 19 26.4432498528 +06 53 21.497184096           ~ 3 0
7 [TCD2009] NYU 2258945 G 09 27 23.3399964744 +21 56 04.800840720           ~ 2 0
8 [TCD2009] NYU 807147 G 09 57 05.5281722016 +04 51 07.033769568           ~ 1 0
9 SDSS J100629.34+071406.4 G 10 06 29.3451942888 +07 14 06.369819540           ~ 2 0
10 2MASS J10163724+3902035 G 10 16 37.2309861312 +39 02 03.595759692           ~ 4 0
11 SDSS J103050.53+625859.8 GiC 10 30 50.5434483648 +62 58 59.827339560           ~ 4 0
12 [TCD2009] NYU 824795 G 10 53 24.1495611984 +06 24 21.187789740           ~ 1 0
13 SDSS J111136.17+534012.0 G 11 11 36.1743075120 +53 40 11.991520416           ~ 3 0
14 [TCD2009] NYU 2434587 G 11 16 59.3484362952 +17 09 17.372036556           ~ 3 0
15 SDSS J113019.87+664928.8 G 11 30 19.8845127360 +66 49 28.810259652           ~ 2 0
16 SDSS J115032.32+170303.5 G 11 50 32.3243086032 +17 03 03.518413056           ~ 4 0
17 LARCS a1437r03-1520 GiC 12 00 32.4653323728 +03 25 54.179561676   19.25   17.27   ~ 6 0
18 SDSS J120251.13+381644.2 G 12 02 51.1408865160 +38 16 44.234900508           ~ 3 0
19 SDSS J120554.69+400958.9 G 12 05 54.6942656568 +40 09 58.895231724           ~ 3 0
20 LEDA 116452 G 12 27 05.1051325224 -03 13 17.972363928           ~ 2 0
21 SDSS J123238.80+425120.6 GiC 12 32 38.8012588968 +42 51 20.542084056           ~ 4 0
22 SDSS J143547.19+543528.7 EmG 14 35 47.2006822848 +54 35 28.714003332           ~ 5 0
23 SDSS J143612.56+040411.8 G 14 36 12.5665517736 +04 04 11.925534216           ~ 2 0
24 SDSS J144736.37+432945.7 G 14 47 36.3728266608 +43 29 45.672204876           ~ 5 0
25 SDSS J153019.45-002918.6 G 15 30 19.4577946608 -00 29 18.638824776           ~ 4 0
26 [TCD2009] NYU 890167 LIN 15 39 34.0705398624 +44 17 52.227993084           ~ 6 0
27 SDSS J212052.74+110713.1 G 21 20 52.7475788784 +11 07 13.122750396           ~ 6 0
28 2MASS J22214033+1359141 Sy1 22 21 40.3259196072 +13 59 14.161994196   18.36 17.63     ~ 4 0
29 SDSS J235202.68+000244.2 G 23 52 02.6890329648 +00 02 44.276209548           ~ 3 0

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