Escape fraction of the ionizing radiation from starburst galaxies at high redshifts

被引：87
作者：
Ferrara, Andrea [1 ]
Loeb, Abraham [2 ]
机构：
[1] Scuola Normale Super Pisa, I-56126 Pisa, Italy
[2] Harvard Univ, Dept Astron, Cambridge, MA 02138 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 431卷 / 03期
关键词：
galaxies: star formation; dark ages; reionization; first stars; STAR-FORMING GALAXIES; LYMAN-CONTINUUM EMISSION; SIMILAR-TO; 7; LUMINOSITY GALAXIES; DENSITY PROFILE; BREAK GALAXIES; MASS; REIONIZATION; PHOTONS; FEEDBACK;
D O I：
10.1093/mnras/stt381
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recent data indicate that the cosmic ultraviolet emissivity decreased with decreasing redshift z near the end of reionization. Lacking evidence for very massive early stars, this could signal a decline with time in the mass-averaged escape fraction of ionizing radiation from galaxies < f(esc)> at z greater than or similar to 6. We calculate the evolution of ionization fronts in dark matter haloes which host gas in hydrostatic equilibrium at its cooling temperature floor (T approximate to 10(4) K for atomic hydrogen). We find a high escape fraction only for the lowest mass haloes [with M < 10(8.7) M-circle dot at (1 + z) = 10], provided their star formation efficiency f(star) greater than or similar to 10(-3). Since the low-mass galaxy population is depleted by radiative feedback, we find that indeed < f(esc)> decreases with time during reionization.
引用
收藏
页码：2826 / 2833
页数：8
相关论文
共 58 条
[1]   In the beginning: the first sources of light and the reionization of the universe [J].
Barkana, R ;
Loeb, A .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 349 (02) :126-238
[2]   The observed ionization rate of the intergalactic medium and the ionizing emissivity at z ≥ 5:: evidence for a photon-starved and extended epoch of reionization [J].
Bolton, James S. ;
Haehnelt, Martin G. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 382 (01) :325-341
[3]   A LOW ESCAPE FRACTION OF IONIZING PHOTONS OF L &gt; L* LYMAN BREAK GALAXIES AT z=3.3 [J].
Boutsia, K. ;
Grazian, A. ;
Giallongo, E. ;
Fontana, A. ;
Pentericci, L. ;
Castellano, M. ;
Zamorani, G. ;
Mignoli, M. ;
Vanzella, E. ;
Fiore, F. ;
Lilly, S. J. ;
Gallozzi, S. ;
Testa, V. ;
Paris, D. ;
Santini, P. .
ASTROPHYSICAL JOURNAL, 2011, 736 (01)
[4]   LOWER-LUMINOSITY GALAXIES COULD REIONIZE THE UNIVERSE: VERY STEEP FAINT-END SLOPES TO THE UV LUMINOSITY FUNCTIONS AT z ≥ 5-8 FROM THE HUDF09 WFC3/IR OBSERVATIONS [J].
Bouwens, R. J. ;
Illingworth, G. D. ;
Oesch, P. A. ;
Trenti, M. ;
Labbe, I. ;
Franx, M. ;
Stiavelli, M. ;
Carollo, C. M. ;
van Dokkum, P. ;
Magee, D. .
ASTROPHYSICAL JOURNAL LETTERS, 2012, 752 (01)
[5]   An extremely primitive star in the Galactic halo [J].
Caffau, Elisabetta ;
Bonifacio, Piercarlo ;
Francois, Patrick ;
Sbordone, Luca ;
Monaco, Lorenzo ;
Spite, Monique ;
Spite, Francois ;
Ludwig, Hans-G. ;
Cayrel, Roger ;
Zaggia, Simone ;
Hammer, Francois ;
Randich, Sofia ;
Molaro, Paolo ;
Hill, Vanessa .
NATURE, 2011, 477 (7362) :67-69
[6]   First stars V -: Abundance patterns from C to Zn and supernova yields in the early Galaxy [J].
Cayrel, R ;
Depagne, E ;
Spite, M ;
Hill, V ;
Spite, F ;
François, P ;
Plez, B ;
Beers, T ;
Primas, F ;
Andersen, J ;
Barbuy, B ;
Bonifacio, P ;
Molaro, P ;
Nordström, B .
ASTRONOMY & ASTROPHYSICS, 2004, 416 (03) :1117-1138
[7]   Intergalactic H2 photodissociation and the soft ultraviolet background produced by population III objects [J].
Ciardi, B ;
Ferrara, A ;
Abel, T .
ASTROPHYSICAL JOURNAL, 2000, 533 (02) :594-600
[8]   The first cosmic structures and their effects [J].
Ciardi, B ;
Ferrara, A .
SPACE SCIENCE REVIEWS, 2005, 116 (3-4) :625-705
[9]   Feedback and the fundamental line of low-luminosity low-surface-brightness/dwarf galaxies [J].
Dekel, A ;
Woo, J .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 344 (04) :1131-1144
[10]   Photoionization feedback in low-mass galaxies at high redshift [J].
Dijkstra, M ;
Haiman, Z ;
Rees, MJ ;
Weinberg, DH .
ASTROPHYSICAL JOURNAL, 2004, 601 (02) :666-675
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