An Extremely Compact, Low-mass Galaxy on its Way to Quiescence at z = 5.2

We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part of the CAnadian NIRISS Unbiased Cluster Survey...

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Published inAstrophysical journal. Letters Vol. 949; no. 2; p. L23
Main Authors Strait, Victoria, Brammer, Gabriel, Muzzin, Adam, Desprez, Guillaume, Asada, Yoshihisa, Abraham, Roberto, Bradač, Maruša, Iyer, Kartheik G., Martis, Nicholas, Mowla, Lamiya, Noirot, Gaël, Sarrouh, Ghassan T. E., Sawicki, Marcin, Willott, Chris, Gould, Katriona, Grindlay, Tess, Matharu, Jasleen, Rihtaršič, Gregor
Format Journal Article
LanguageEnglish
Published Austin The American Astronomical Society 01.06.2023
IOP Publishing
Subjects
Active galactic nuclei
Clusters
Compact galaxies
Galaxies
Post-starburst galaxies
Spectrophotometry
Star & galaxy formation
Star formation
Star formation rate
Stars
Stellar mass
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Abstract We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Using observations of MACS0417-z5BBG with a JWST/NIRSpec Prism spectrum and NIRCam imaging, we investigate the mechanism responsible for the cessation of star formation of the galaxy and speculate about possibilities for its future. Using spectrophotometric fitting, we find a remarkably low stellar mass of M * = 4.3 ± 0.8 0.9 × 10 7 M ⊙ , less than 1% of the characteristic stellar mass at z ∼ 5. We measure a delensed rest-UV half-light radius in the source plane of 30 ± 5 7 pc and measure a star formation rate from H α of 0.14 ± 0.12 0.17 M ⊙ yr −1 . We find that under the assumption of a double power-law star formation history, MACS0417-z5BBG has seen a recent rise in star formation, peaking ∼10–30 Myr ago and declining precipitously since then. Together, these measurements reveal a low-mass, extremely compact galaxy which is in the process of ceasing star formation. We investigate the possibilities of mechanisms that have led to the cessation of star formation in MACS0417-z5BBG, considering stellar and active galactic nuclei (AGN) feedback and environmental processes. We can likely rule out most environmental processes but leave open the possibility of a low-mass AGN that does not leave a broad-line imprint on the spectrum or that MACS0417-z5BBG could be a star-forming galaxy in the lull of a bursty star formation history.
AbstractList We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Using observations of MACS0417-z5BBG with a JWST/NIRSpec Prism spectrum and NIRCam imaging, we investigate the mechanism responsible for the cessation of star formation of the galaxy and speculate about possibilities for its future. Using spectrophotometric fitting, we find a remarkably low stellar mass of M * = 4.3 ± 0.8 0.9 × 10 7 M ⊙ , less than 1% of the characteristic stellar mass at z ∼ 5. We measure a delensed rest-UV half-light radius in the source plane of 30 ± 5 7 pc and measure a star formation rate from H α of 0.14 ± 0.12 0.17 M ⊙ yr −1 . We find that under the assumption of a double power-law star formation history, MACS0417-z5BBG has seen a recent rise in star formation, peaking ∼10–30 Myr ago and declining precipitously since then. Together, these measurements reveal a low-mass, extremely compact galaxy which is in the process of ceasing star formation. We investigate the possibilities of mechanisms that have led to the cessation of star formation in MACS0417-z5BBG, considering stellar and active galactic nuclei (AGN) feedback and environmental processes. We can likely rule out most environmental processes but leave open the possibility of a low-mass AGN that does not leave a broad-line imprint on the spectrum or that MACS0417-z5BBG could be a star-forming galaxy in the lull of a bursty star formation history.
We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Using observations of MACS0417-z5BBG with a JWST/NIRSpec Prism spectrum and NIRCam imaging, we investigate the mechanism responsible for the cessation of star formation of the galaxy and speculate about possibilities for its future. Using spectrophotometric fitting, we find a remarkably low stellar mass of ${M}_{* }=4.3{\pm }_{0.8}^{0.9}\times {10}^{7}{M}_{\odot }$ , less than 1% of the characteristic stellar mass at z ∼ 5. We measure a delensed rest-UV half-light radius in the source plane of $30{\pm }_{5}^{7}$ pc and measure a star formation rate from H α of $0.14{\pm }_{0.12}^{0.17}$ M _⊙ yr ^−1 . We find that under the assumption of a double power-law star formation history, MACS0417-z5BBG has seen a recent rise in star formation, peaking ∼10–30 Myr ago and declining precipitously since then. Together, these measurements reveal a low-mass, extremely compact galaxy which is in the process of ceasing star formation. We investigate the possibilities of mechanisms that have led to the cessation of star formation in MACS0417-z5BBG, considering stellar and active galactic nuclei (AGN) feedback and environmental processes. We can likely rule out most environmental processes but leave open the possibility of a low-mass AGN that does not leave a broad-line imprint on the spectrum or that MACS0417-z5BBG could be a star-forming galaxy in the lull of a bursty star formation history.
We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Using observations of MACS0417-z5BBG with a JWST/NIRSpec Prism spectrum and NIRCam imaging, we investigate the mechanism responsible for the cessation of star formation of the galaxy and speculate about possibilities for its future. Using spectrophotometric fitting, we find a remarkably low stellar mass of M*=4.3±0.80.9×107M⊙, less than 1% of the characteristic stellar mass at z ∼ 5. We measure a delensed rest-UV half-light radius in the source plane of 30±57 pc and measure a star formation rate from Hα of 0.14±0.120.17M⊙ yr−1. We find that under the assumption of a double power-law star formation history, MACS0417-z5BBG has seen a recent rise in star formation, peaking ∼10–30 Myr ago and declining precipitously since then. Together, these measurements reveal a low-mass, extremely compact galaxy which is in the process of ceasing star formation. We investigate the possibilities of mechanisms that have led to the cessation of star formation in MACS0417-z5BBG, considering stellar and active galactic nuclei (AGN) feedback and environmental processes. We can likely rule out most environmental processes but leave open the possibility of a low-mass AGN that does not leave a broad-line imprint on the spectrum or that MACS0417-z5BBG could be a star-forming galaxy in the lull of a bursty star formation history.
Author Muzzin, Adam
Asada, Yoshihisa
Grindlay, Tess
Desprez, Guillaume
Mowla, Lamiya
Rihtaršič, Gregor
Strait, Victoria
Noirot, Gaël
Sawicki, Marcin
Brammer, Gabriel
Martis, Nicholas
Matharu, Jasleen
Abraham, Roberto
Gould, Katriona
Willott, Chris
Bradač, Maruša
Iyer, Kartheik G.
Sarrouh, Ghassan T. E.
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  organization: University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia
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  givenname: Kartheik G.
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  surname: Iyer
  fullname: Iyer, Kartheik G.
  organization: Columbia University Columbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027, USA
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  surname: Martis
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  organization: Saint Mary’s University Institute for Computational Astrophysics and Department of Astronomy & Physics, 923 Robie Street, Halifax, NS B3H 3C3, Canada
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  givenname: Ghassan T. E.
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  surname: Sarrouh
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  organization: York University Department of Physics and Astronomy, 4700 Keele Street, Toronto, Ontario, MJ3 1P3, Canada
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  surname: Willott
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  orcidid: 0000-0003-4196-5960
  surname: Gould
  fullname: Gould, Katriona
  organization: University of Copenhagen Niels Bohr Institute, Jagtvej 128, DK-2200 Copenhagen N, Denmark
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  givenname: Tess
  orcidid: 0009-0006-4881-3299
  surname: Grindlay
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  surname: Matharu
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  fullname: Rihtaršič, Gregor
  organization: University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia
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Snippet We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply...
We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply...
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SubjectTerms Active galactic nuclei
Clusters
Compact galaxies
Galaxies
Post-starburst galaxies
Spectrophotometry
Star & galaxy formation
Star formation
Star formation rate
Stars
Stellar mass
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Title An Extremely Compact, Low-mass Galaxy on its Way to Quiescence at z = 5.2
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