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MIDIS: The Relation between Strong (Hβ + [O iii]) Emission, Star Formation, and Burstiness around the Epoch of Reionization

Astrophysical Journal, ISSN: 1538-4357, Vol: 969, Issue: 2
2024
  • 5
    Citations
  • 0
    Usage
  • 11
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    5
    • Citation Indexes
      5
  • Captures
    11

Article Description

We investigate the properties of strong (Hβ + [O iii]) emitters before and after the end of the “Epoch of Reionization” from z = 8 to z = 5.5. We make use of ultradeep JWST/NIRCam imaging in the parallel field (P2) of the MIRI Deep Imaging Survey (MIDIS) in the Hubble eXtreme Deep Field (H-XDF), in order to select prominent (Hβ + [O iii]) emitters (with rest-frame equivalent width (EW) ≳ 100 Å) at z = 5.5-7, based on their flux density enhancement in the F356W band with respect to the spectral energy distribution continuum. We complement our selection with other (Hβ + [O iii]) emitters from the literature at similar and higher (z = 7−8) redshifts. We find (nonindependent) anticorrelations between EW(Hβ + [O iii]) and both galaxy stellar mass and age, in agreement with previous studies, and a positive correlation with specific star formation rate (sSFR). On the SFR-M plane, the (Hβ + [O iii]) emitters populate both the star formation main sequence and the starburst region, which become indistinguishable at low stellar masses ( log 10 ( M ⋆ ) < 7.5 ). We find tentative evidence for a nonmonotonic relation between EW(Hβ + [O iii]) and SFR, such that both parameters correlate with each other at SFR ≳ 1 M yr, while the correlation flattens out at lower SFRs. This suggests that low metallicities producing high EW(Hβ + [O iii]) could be important at low SFR values. Interestingly, the properties of the strong emitters and other galaxies (33% and 67% of our z = 5.5-7 sample, respectively) are similar, including, in many cases, high sSFR. Therefore, it is crucial to consider both emitters and nonemitters to obtain a complete picture of the cosmic star formation activity around the Epoch of Reionization.

Bibliographic Details

K. I. Caputi; P. Rinaldi; E. Iani; P. G. Pérez-González; G. Östlin; L. Colina; T. R. Greve; H. U. Nørgaard-Nielsen; G. S. Wright; J. Álvarez-Márquez; A. Eckart; J. Hjorth; A. Labiano; O. Le Fèvre; F. Walter; P. van der Werf; L. Boogaard; L. Costantin; A. Crespo Gómez; S. Gillman; I. Jermann; D. Langeroodi; J. Melinder; F. Peissker; M. Güdel; Th. Henning; P. O. Lagage; T. P. Ray

American Astronomical Society

Physics and Astronomy; Earth and Planetary Sciences

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