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
- 5Citations
- 11Captures
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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
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85198629505&origin=inward; http://dx.doi.org/10.3847/1538-4357/ad4eb2; https://iopscience.iop.org/article/10.3847/1538-4357/ad4eb2; https://dx.doi.org/10.3847/1538-4357/ad4eb2; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=ebcbb2c8-3558-439b-a67d-75a22f0fd489&ssb=21904224166&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.3847%2F1538-4357%2Fad4eb2&ssi=74b4d619-8427-411d-a6cc-077e5cf882ab&ssk=support@shieldsquare.com&ssm=71795541458671064696345207290387470&ssn=a01e3a704b6a5b9ec787e37de75be48dfccb2f0fbc69-9e01-4767-94343c&sso=a3155809-259ac1c821e109ef991a3e465539c1e8525121d63f17cf1c&ssp=05529376861721209509172143987976417&ssq=13604070173085541344436784266178032118933&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJ1em14IjoiN2Y5MDAwYzRhOTI4MWEtNWZjMS00ZGYzLWI4NzYtYjk2N2Q4OTViOTI1My0xNzIxMjM2Nzg0NTAyMTY0OTQ2MTE2LWNkZDU4OTQzMDcxMmIxN2U2OTYzMSIsIl9fdXptZiI6IjdmNjAwMGQ5NjZiMGQ0LWI0NzctNDMyZi1iZTQzLTFlMDQ2MTAxODE3ODE3MjEyMzY3ODQ1MDIxNjQ5NDYxMTYtYWNmOTBkNTRkYzU0OWEyOTY5NjM0IiwicmQiOiJpb3Aub3JnIn0=
American Astronomical Society
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