Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1709.04470)
· On-line Data
· References in the article
· Citations to the Article (12) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
On the UV compactness and morphologies of typical Lyman alpha emitters from z ˜ 2 to z ˜ 6
Authors:
Paulino-Afonso, Ana; Sobral, David; Ribeiro, Bruno; Matthee, Jorryt; Santos, Sérgio; Calhau, João; Forshaw, Alex; Johnson, Andrea; Merrick, Joanna; Pérez, Sara; Sheldon, Oliver
Affiliation:
AA(Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, P-1349-018 Lisboa, Portugal; Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, P-1749-016 Lisboa, Portugal; Department of Physics, Lancaster University, Lancaster LA1 4YB, UK 0000-0002-0943-0694), AB(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK; Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands 0000-0001-8823-4845), AC(Centro de Computação Gráfica, CVIG, Campus de Azurém, P-4800-058 Guimarães, Portugal), AD(Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands), AE(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK), AF(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK), AG(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK), AH(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK), AI(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK), AJ(Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, P-1349-018 Lisboa, Portugal; Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, P-1749-016 Lisboa, Portugal; Department of Physics, Lancaster University, Lancaster LA1 4YB, UK), AK(Department of Physics, Lancaster University, Lancaster LA1 4YB, UK)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 4, p.5479-5501 (MNRAS Homepage)
Publication Date:
06/2018
Origin:
OUP
Astronomy Keywords:
galaxies: evolution, galaxies: high-redshift, galaxies: star formation, galaxies: structure
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty281
Bibliographic Code:
2018MNRAS.476.5479P

Abstract

We investigate the rest-frame UV morphologies of a large sample of Lyman alpha emitters (LAEs) from z ˜ 2 to z ˜ 6, selected in a uniform way with 16 different narrow and medium bands over the full COSMOS field. We use 3045 LAEs with Hubble Space Telescope coverage in a stacking analysis and find that they have MUV ˜ -20, below M_UV^\ast at these redshifts. We also focus our analysis on a subsample of 780 individual galaxies with iAB < 25 for which GALFIT converges for 429 of them. The individual median size (re ˜ 1 kpc), ellipticities [slightly elongated with (b/a) ˜ 0.45], Sérsic index (disc-like with n ≲ 2), and light concentration (comparable to that of disc or irregular galaxies, with C ˜ 2.7) of LAEs show mild evolution from z ˜ 2 to z ˜ 6. LAEs with the highest rest-frame equivalent widths (EWs) are the smallest/most compact (re ˜ 0.8 kpc, compared to re ˜ 1.5 kpc for the lower EW LAEs). When stacking our samples in bins of fixed Lyalpha luminosity and Lyalpha EW, we find evidence for redshift evolution in n and C, but not in galaxy sizes. The evolution seems to be stronger for LAEs with 25 < EW < 100 Å. When compared to other star-forming galaxies (SFGs), LAEs are found to be smaller at all redshifts. The difference between the two populations changes with redshift, from a factor of ˜1 at z ≳ 5 to SFGs being a factor of ˜2-4 larger than LAEs for z ≲ 2. This means that at the highest redshifts, where typical sizes approach those of LAEs, the fraction of galaxies showing Lyalpha in emission (and with a high Lyalpha escape fraction) should be much higher, consistent with observations.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints