Lyα-emitting galaxies at z=3.1:: L* progenitors experiencing rapid star formation

被引：273

作者：

Gawiser, Eric ^{[1
,2
,3
,4
]}

Francke, Harold ^{[1
,3
]}

Lai, Kamson ^{[5
]}

Schawinski, Kevin ^{[6
]}

Gronwall, Caryl ^{[7
]}

Ciardullo, Robin ^{[7
]}

Quadri, Ryan ^{[1
]}

Orsi, Alvaro ^{[8
]}

Barrientos, Felipe ^{[8
]}

Blanc, Guillermo A. ^{[3
,9
]}

Fazio, Giovanni ^{[5
]}

Feldmeier, John J. ^{[10
]}

Huang, Jia-Sheng ^{[5
]}

Infante, Leopoldo ^{[8
]}

Lira, Paulina ^{[3
]}

Padilla, Nelson ^{[8
]}

Taylor, Edward N. ^{[11
]}

Treister, Ezequiel ^{[1
,3
,12
]}

Urry, C. Megan ^{[1
,2
,13
]}

Van Dokkum, Pieter G. ^{[1
,2
]}

Virani, Shanil N. ^{[1
,2
]}

机构：

[1] Yale Univ, Dept Astron, New Haven, CT 06511 USA

[2] Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT USA

[3] Univ Chile, Dept Astron, Santiago, Chile

[4] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] Univ Oxford, Oxford, England

[7] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[8] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago, Chile

[9] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[10] Youngstown State Univ, Dept Phys & Astron, Youngstown, OH 44555 USA

[11] Leiden Observ, NL-2300 RA Leiden, Netherlands

[12] European So Observ, Santiago 19, Chile

[13] Yale Univ, Dept Phys, New Haven, CT USA

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 671卷 / 01期

关键词：

galaxies : evolution; galaxies : formation; galaxies : high redshift; large-scale structure of universe;

D O I：

10.1086/522955

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Ly alpha- emitting (LAE) galaxies at z similar or equal to 3: 1 discovered in deep narrowband MUSYC imaging of the Extended Chandra Deep Field-South. LAEs were selected to have observed frame equivalent widths >80 angstrom and emission line fluxes >1.5 x 10(-17) ergs cm(-2) s(-1). Only 1% of our LAE sample appears to host AGNs. The LAEs exhibit a moderate spatial correlation length of r(0) = 3.6(-1.0)(+0.8) Mpc, corresponding to a bias factor b = 1.7(-0.4)(+0.3), which implies median dark matter halo masses of log(10)M(med) = 10.9(-0.9)(+0.5) M-circle dot. Comparing the number density of LAEs, 1.5 +/- 0.3 x 10(-3) Mpc(-3), with the number density of these halos finds a mean halo occupation similar to 1%-10%. The evolution of galaxy bias with redshift implies that most z 3: 1 LAEs evolve into present-day galaxies with L < 2.5L*, whereas other z > 3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z 0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L*. Only 30% of LAEs have sufficient stellar mass (>similar to 3 x 10(9) M-circle dot) to yield detections in deep Spitzer IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6, 4.5, 5.6, 8.0] mu m fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0(-0.4)(+0.6) 10(9) M-circle dot), moderate star formation rate (2 +/- 1 M-circle dot yr(-1)), a young component age of 20(-10)(+30) Myr, and little dust (A(V) < 0: 2). The bestfit model has 20% of the mass in the young stellar component, but models without evolved stars are also allowed.

引用

页码：278 / 284

页数：7

共 76 条

[1] Strong spatial clustering of ultraviolet-selected galaxies with magnitude Ks < 20.5 and redshift z ∼ 2 [J].