The impact of nebular emission on the ages of z ≈ 6 galaxies

被引：0
|
作者：
Schaerer, D. [1 ,2 ]
De Barros, S. [1 ]
机构：
[1] Geneva Observatory, University of Geneva, 51 Ch. des Maillettes, 1290 Versoix, Switzerland
[2] Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France
来源：
Astronomy and Astrophysics | 1600年 / 502卷 / 02期
关键词：
Alms. We examine the influence of nebular continuous and line emission in high-redshift star forming galaxies on determinations of their age; formation redshift; and other properties from SED fits. Methods. We include nebular emission consistently with the stellar emission in our SED fitting tool and analyse differentially a sample of 10 z ≈ 6 galaxies in the GOODS-S field studied earlier elsewhere. Results. We find mat the apparent Balmer/4000 breaks observed in a number of z ≈ 6 galaxies detected at 3.6 μm with IRAC/Spitzer can be mimicked by the presence of strong restframe optical emission lines; implying in particular younger ages than previously thought. Applying these models to the small sample of z ≈ 6 galaxies; we find that this effect may lead to a typical downward revision of their stellar ages by a factor ∼3. In consequence their average formation redshift may be reduced drastically; and these objects may not have contributed to cosmic reionisation at z > 6. Extinction and stellar mass estimates may also be somewhat modified; but to a lesser extent. Conclusions. Careful SED fits including nebular emission and treating properly uncertainties and degeneracies are necessary for more accurate determinations of the physical parameters of high-z galaxies. ©ESO 2009;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
页码：423 / 426
相关论文
共 50 条
  • [41] Hα emission in the outskirts of galaxies at z=0.4
    Shimakawa, Rhythm
    Tanaka, Masayuki
    Kikuta, Satoshi
    Hayashi, Masao
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2022, 74 (02) : 318 - 325
  • [42] A search for emission line galaxies at z=6.5
    Kurk, J
    Cimatti, A
    Alighieri, SD
    Vernet, J
    Daddi, E
    Multiwavelength Mapping of Galaxy Formation and Evolution, 2005, : 406 - 407
  • [43] Active Galaxies from Z=0 to Z=6
    Barger, AJ
    EMERGENCE OF COSMIC STRUCTURE, 2003, 666 : 205 - 213
  • [44] An Old Stellar Population or Diffuse Nebular Continuum Emission Discovered in Green Pea Galaxies
    Clarke, Leonardo
    Scarlata, Claudia
    Mehta, Vihang
    Keel, William C.
    Cardamone, Carolin
    Hayes, Matthew
    Adams, Nico
    Dickinson, Hugh
    Fortson, Lucy
    Kruk, Sandor
    Lintott, Chris
    Simmons, Brooke
    ASTROPHYSICAL JOURNAL LETTERS, 2021, 912 (02)
  • [45] Strongly star forming galaxies in the local Universe with nebular He II λ4686 emission
    Shirazi, Maryam
    Brinchmann, Jarle
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 421 (02) : 1043 - 1063
  • [46] Spectroscopy of z-6 i-dropout galaxies:: Frequency of Lyα emission and the sizes of Lyα-emitting galaxies
    Dow-Hygelund, C. C.
    Holden, B. P.
    Bouwens, R. J.
    Illingworth, G. D.
    van der Wel, A.
    Franx, M.
    van Dokkum, P. G.
    Ford, H.
    Rosati, P.
    Magee, D.
    Zirm, A.
    ASTROPHYSICAL JOURNAL, 2007, 660 (01): : 47 - 61
  • [47] Discovery of galaxies in the z=1.5-2.5 "Bright Ages"
    Colbert, JW
    Malkan, M
    Rich, M
    EMERGENCE OF COSMIC STRUCTURE, 2003, 666 : 241 - 244
  • [48] INFERENCES ON THE DISTRIBUTION OF Lyα EMISSION OF z ∼ 7 AND z ∼ 8 GALAXIES
    Treu, Tommaso
    Trenti, Michele
    Stiavelli, Massimo
    Auger, Matthew W.
    Bradley, Larry D.
    ASTROPHYSICAL JOURNAL, 2012, 747 (01):
  • [49] The evolution of the ages and metallicities of massive galaxies since z=0.7
    Gallazzi, Anna
    Bell, Eric F.
    Zibetti, Stefano
    Brinchmann, Jarle
    Kelson, Daniel D.
    GALAXY MASSES AS CONSTRAINTS OF FORMATION MODELS, 2015, 10 (311): : 126 - 129
  • [50] JWST/NIRSpec Measurements of the Relationships between Nebular Emission-line Ratios and Stellar Mass at z ∼ 3-6
    Shapley, Alice E.
    Reddy, Naveen A.
    Sanders, Ryan L.
    Topping, Michael W.
    Brammer, Gabriel B.
    ASTROPHYSICAL JOURNAL LETTERS, 2023, 950 (01)
12345