Formation of galactic bulges

被引:6
作者
Gnedin, NY
Norman, ML
Ostriker, JP
机构
[1] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA
[2] Univ Illinois, Natl Ctr Supercomp Applicat, Lab Computat Astrophys, Urbana, IL 61801 USA
[3] Princeton Univ Observ, Princeton, NJ 08544 USA
关键词
cosmology : theory; galaxies : formation; intergalactic medium; large-scale structure of universe;
D O I
10.1086/309322
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use cosmological hydrodynamic simulations to investigate the formation of galactic bulges within the framework of hierarchical clustering in a representative cold dark matter (CDM) cosmological model. We show that the largest objects forming at cosmological redshifts z similar to 4 resemble observed bulges of spiral galaxies or moderate-sized ellipticals in their general properties, such as size, shape, and density profile. This is consistent with observational data indicating the existence of "old" bulges and ellipticals at more moderate redshifts. These bulges are gas dominated at redshift z = 3, with high rates of star formation, and would appear to be good candidates for small blue galaxies seen in the Hubble Deep Field.
引用
收藏
页码:32 / 38
页数:7
相关论文
共 20 条
[1]  
ABEL T, 1999, EVOLUTION LARGE SCAL, P42
[2]  
Burkert A, 1999, DARK MATTER IN ASTROPHYSICS AND PARTICLE PHYSICS 1998, P375
[3]   Photometric evolution of galaxies in cosmological scenarios [J].
Contardo, G ;
Steinmetz, M ;
Fritze-von Alvensleben, U .
ASTROPHYSICAL JOURNAL, 1998, 507 (02) :497-506
[4]   A COBE model of the galactic bar and disk [J].
Freudenreich, HT .
ASTROPHYSICAL JOURNAL, 1998, 492 (02) :495-510
[5]   SOFTENED LAGRANGIAN HYDRODYNAMICS FOR COSMOLOGY [J].
GNEDIN, NY .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1995, 97 (02) :231-257
[6]   Galaxy formation in a CDM+Lambda universe .1. Properties of gas and galaxies [J].
Gnedin, NY .
ASTROPHYSICAL JOURNAL, 1996, 456 (01) :1-33
[7]   Reionization of the universe and the early production of metals [J].
Gnedin, NY ;
Ostriker, JP .
ASTROPHYSICAL JOURNAL, 1997, 486 (02) :581-598
[8]   Building a cosmological hydrodynamic code: Consistency condition, moving mesh gravity, and SLH-P(3)M [J].
Gnedin, NY ;
Bertschinger, E .
ASTROPHYSICAL JOURNAL, 1996, 470 (01) :115-130
[9]   INFALL OF MATTER INTO CLUSTERS OF GALAXIES AND SOME EFFECTS ON THEIR EVOLUTION [J].
GUNN, JE ;
GOTT, JR .
ASTROPHYSICAL JOURNAL, 1972, 176 (01) :1-&
[10]   GALACTIC STRUCTURE FROM THE SPACELAB INFRARED TELESCOPE .2. LUMINOSITY MODELS OF THE MILKY-WAY [J].
KENT, SM ;
DAME, TM ;
FAZIO, G .
ASTROPHYSICAL JOURNAL, 1991, 378 (01) :131-138