Lyman break and ultraviolet-selected galaxies at z ∼ 1-I. Stellar populations from the ALHAMBRA survey

被引：6

作者：

Oteo, I. ^{[1
,2
]}

Bongiovanni, A. ^{[1
,2
]}

Cepa, J. ^{[1
,2
]}

Perez-Garcia, A. M. ^{[1
,2
,3
]}

Ederoclite, A. ^{[4
]}

Sanchez-Portal, M. ^{[3
,5
]}

Pintos-Castro, I. ^{[1
,2
,15
]}

Perez-Martinez, R. ^{[6
]}

Polednikova, J. ^{[1
,2
]}

Aguerri, J. A. L. ^{[6
]}

Alfaro, E. J. ^{[7
]}

Aparicio-Villegas, T. ^{[7
,16
]}

Benitez, N. ^{[7
]}

Broadhurst, T. ^{[8
]}

Cabrera-Cano, J. ^{[9
]}

Castander, F. J. ^{[10
]}

Cervino, M. ^{[7
]}

Cristobal-Hornillos, D. ^{[4
,7
]}

Fernandez-Soto, A. ^{[11
,17
]}

Gonzalez-Delgado, R. M. ^{[7
]}

Husillos, C. ^{[7
]}

Infante, L. ^{[12
]}

Martinez, V. J. ^{[13
,14
]}

Marquez, I. ^{[7
]}

Masegosa, J. ^{[7
]}

Matute, I. ^{[7
]}

Moles, M. ^{[4
,7
]}

Molino, A. ^{[7
]}

del Olmo, A. ^{[7
]}

Perea, J. ^{[7
]}

Povic, M. ^{[7
]}

Prada, F. ^{[7
]}

Quintana, J. M. ^{[7
]}

Viironen, K. ^{[4
]}

机构：

[1] IAC, E-38200 Tenerife, Spain

[2] ULL, Dept Astrofis, E-38200 Tenerife, Spain

[3] Asociac ASPID, Tenerife, Spain

[4] Ctr Estudios Fis Cosmos Aragon, E-44001 Teruel, Spain

[5] Herschel Sci Ctr ESAC, E-28692 Madrid, Spain

[6] XMM Newton Sci Operat Ctr ESAC, Villafranca Del Castillo, Spain

[7] Inst Astrofis Andalucia CSIC, E-18008 Granada, Spain

[8] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[9] Univ Seville, Fac Fis, Dept Fis Atom & Mol Nucl, Seville, Spain

[10] IEEC CSIC, Inst Ciencies Espai, Barcelona, Spain

[11] Inst Fis Cantabria CSIC UC, E-39005 Santander, Spain

[12] Ponticia Univ Catolica, Dept Astron, Santiago 7820436, Chile

[13] Univ Valencia, Dept Astron & Astrofis, Valencia, Spain

[14] Univ Valencia, Astron Observ, Valencia, Spain

[15] INTA CSIC, Ctr Astrobiol, E-28691 Madrid, Spain

[16] Observ Nacl MCT, BR-20921400 Rio De Janeiro, RJ, Brazil

[17] Univ Valencia, IFCA CSIC, Unidad Asociada Observ Astronm, E-46980 Paterna, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 433卷 / 04期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

galaxies: evolution; galaxies: photometry; galaxies: high-redshift; galaxies: star formation; cosmology: observations; ultraviolet: galaxies; LY-ALPHA EMITTERS; STAR-FORMING GALAXIES; HIGH-REDSHIFT GALAXIES; DEEP FIELD-SOUTH; FORMATION RATE DENSITY; RELEASE SCIENCE OBSERVATIONS; STARBURST INTENSITY LIMIT; UV LUMINOSITY FUNCTION; DIGITAL SKY SURVEY; MASS-SIZE RELATION;

D O I：

10.1093/mnras/stt835

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We take advantage of the exceptional photometric coverage provided by the combination of GALEX data in the ultraviolet (UV) and the ALHAMBRA survey in the optical and near-infrared to analyse the physical properties of a sample of 1225 GALEX-selected Lyman break galaxies (LBGs) at 0.8 less than or similar to z less than or similar to 1.2 that are located in the COSMOS field. This is the largest sample of LBGs studied in this redshift range to date. According to a spectral energy distribution (SED) fitting with synthetic stellar population templates, we find that LBGs at z similar to 1 are mostly young galaxies with a median age of 341 Myr and have intermediate dust attenuation, << E-s(B - V)>> similar to 0.20. Owing to the selection criterion, LBGs at z similar to 1 are UV-bright galaxies and have a high dust-corrected total star formation rate (SFR), with a median value of 16.9 M-circle dot yr(-1). Their median stellar mass is log (M-*/M-circle dot) = 9.74. We find that the dust-corrected total SFR of LBGs increases with stellar mass and that the specific SFR is lower for more massive galaxies (downsizing scenario). Only 2 per cent of the galaxies selected through the Lyman break criterion have an active galactic nucleus nature. LBGs at z similar to 1 are located mostly over the blue cloud of the colour-magnitude diagram of galaxies at their redshift, with only the oldest and/or the dustiest deviating towards the green valley and red sequence. Morphologically, 69 per cent of LBGs are disc-like galaxies, with the fractions of interacting, compact, or irregular systems being much lower, below 12 per cent. LBGs have a median effective radius of 2.5 kpc, and larger galaxies have a higher total SFR and stellar mass. Compared with their high-redshift analogues, we find evidence that LBGs at lower redshifts are larger, redder in the UV continuum, and have a major presence of older stellar populations in their SEDs. However, we do not find significant differences in the distributions of stellar mass or dust attenuation.

引用

页码：2706 / 2726

页数：21

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