The star-forming and ionizing properties of dwarf z ∼ 6-9 galaxies in JADES: insights on bursty star formation and ionized bubble growth

被引:71
作者
Endsley, Ryan [1 ]
Stark, Daniel P. [2 ]
Whitler, Lily [2 ]
Topping, Michael W. [2 ]
Johnson, Benjamin D. [3 ]
Robertson, Brant [4 ]
Tacchella, Sandro [5 ,6 ]
Alberts, Stacey [2 ]
Baker, William M. [5 ,6 ]
Bhatawdekar, Rachana [7 ]
Boyett, Kristan [8 ,9 ]
Bunker, Andrew J. [10 ]
Cameron, Alex J. [10 ]
Carniani, Stefano [11 ]
Charlot, Stephane [12 ]
Chen, Zuyi [2 ]
Chevallard, Jacopo [10 ]
Curtis-Lake, Emma [13 ]
Danhaive, A. Lola [5 ,6 ]
Egami, Eiichi [2 ]
Eisenstein, Daniel J. [3 ]
Hainline, Kevin [2 ]
Helton, Jakob M. [2 ]
Ji, Zhiyuan [2 ]
Looser, Tobias J. [5 ,6 ]
Maiolino, Roberto [5 ,6 ,14 ]
Nelson, Erica [15 ]
Puskas, David [5 ,6 ]
Rieke, George [2 ]
Rieke, Marcia [2 ]
Rix, Hans-Walter [16 ]
Sandles, Lester [5 ,6 ]
Saxena, Aayush [10 ,17 ]
Simmonds, Charlotte [5 ,6 ]
Smit, Renske [18 ]
Sun, Fengwu [2 ]
Williams, Christina C. [19 ]
Willmer, Christopher N. A. [2 ]
Willott, Chris [20 ]
Witstok, Joris [5 ,6 ]
机构
[1] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
[2] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA
[3] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
[4] Univ Calif Santa Cruz, Dept Astron & Astrophys, 1156 High St, Santa Cruz, CA 96054 USA
[5] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England
[6] Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
[7] European Space Agcy, ESA ESTEC, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands
[8] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia
[9] ARC Ctr Excellence All Sky Astrophys 3 Dimens ASTR, Brisbane, Australia
[10] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
[11] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy
[12] Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France
[13] Univ Hertfordshire, Ctr Astrophys Res, Dept Phys Astron & Math, Hatfield AL10 9AB, England
[14] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
[15] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA
[16] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
[17] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
[18] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, England
[19] NSFs Natl Opt Infrared Astron Res Lab, 950 North Cherry Ave, Tucson, AZ 85719 USA
[20] NRC Herzberg, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada
基金
英国科学技术设施理事会; 澳大利亚研究理事会; 美国国家科学基金会; 欧洲研究理事会;
关键词
galaxies: evolution; galaxies: high-redshift; dark ages; reionization; first stars; LYMAN-BREAK GALAXIES; LY-ALPHA EMISSION; UV LUMINOSITY FUNCTIONS; HUBBLE FRONTIER FIELDS; ULTRA-DEEP FIELD; O III EMITTERS; EQUIVALENT-WIDTH DISTRIBUTION; STELLAR MASS FUNCTIONS; LESS-THAN; SPECTRAL ENERGY-DISTRIBUTIONS;
D O I
10.1093/mnras/stae1857
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Reionization is thought to be driven by faint star-forming galaxies, but characterizing this population has long remained very challenging. Here, we utilize deep nine-band JADES (JWST Advanced Deep Extragalactic Survey)/NIRCam (Near-Infrared Camera) imaging to study the star-forming and ionizing properties of 756 similar to 6-9 galaxies, including hundreds of very ultraviolet (UV)-faint objects (M-UV > -18). The faintest (m similar to 30) galaxies in our sample typically have stellar masses of M-* similar to (1-3) x 10(7) M-circle dot and young light-weighted ages (similar to 50 Myr), though some show strong Balmer breaks implying much older ages (similar to 500 Myr). We find no evidence for extremely massive galaxies (> 3 x 10(10) M-circle dot) in our sample. We infer a strong (factor >2) decline in the typical [O III] + H beta equivalent widths (EWs) towards very faint z similar to 6-9 galaxies, yet a weak UV luminosity dependence on the H alpha EWs at z similar to 6. We demonstrate that these EW trends can be explained if fainter galaxies have systematically lower metallicities as well as more recently declining star formation histories relative to the most UV-luminous galaxies. Our data provide evidence that the brightest galaxies are frequently experiencing a recent strong upturn in star formation rate. We also discuss how the EW trends may be influenced by a strong correlation between M-UV and Lyman continuum escape fraction. This alternative explanation has dramatically different implications for the contribution of galaxies along the luminosity function to cosmic reionization. Finally, we quantify the photometric overdensities around two z > 7 strong Ly alpha emitters. One Ly alpha emitter lies close to a strong photometric overdensity, while the other shows no significant nearby overdensity, perhaps implying that not all strong z > 7 Ly alpha emitters reside in large ionized bubbles.
引用
收藏
页码:1111 / 1142
页数:32
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