The Sizes of $z\sim9-10$ Galaxies Identified in the BoRG Survey
Redshift $z=9--10$ object selection is the effective limit of Hubble Space Telescope imaging capability, even when confirmed with Spitzer. If only a few photometry data points are available, it becomes attractive to add criteria based on their morphology in these J- and H-band images. One could do s...
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Abstract | Redshift $z=9--10$ object selection is the effective limit of Hubble Space
Telescope imaging capability, even when confirmed with Spitzer. If only a few
photometry data points are available, it becomes attractive to add criteria
based on their morphology in these J- and H-band images.
One could do so through visual inspection, a size criterion, or alternate
morphometrics. We explore a vetted sample of BoRG $z\sim9$ and $z\sim10$
candidate galaxies and the object rejected by Morishita+ (2018) to explore the
utility of a size criterion in z=9-10 candidate selection. A stringent,
PSF-corrected effective radius criterion ($r_e<0\farcs3$) would result in the
rejection of 65-70\% of the interlopers visually rejected by Morishita+. It may
also remove up to $\sim20$\% of bona-fide brightest ($L>>L^*$) z=9 or 10
candidates from a BoRG selected sample based on the Mason+ (2015) luminosity
functions, assuming the Holwerda+ (2015) $z\sim9$ size-luminosity relation. We
argue that including a size constraint in lieu of a visual inspection may serve
in wide-field searches for these objects in e.g. EUCLID or HST archival imaging
with the understanding that some brightest ($L>>L^*$) candidates may be missed.
The sizes of the candidates found by Morishita+ (2018) follow the expected
size distribution of $z\sim9$ for bright galaxies, consistent with the
lognormal in Shibuya+ (2015) and single objects. Two candidates show high
star-formation surface density ($\Sigma_{SFR} > 25 M_\odot/kpc^2$) and all
merit further investigation and follow-up observations. |
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AbstractList | Redshift $z=9--10$ object selection is the effective limit of Hubble Space
Telescope imaging capability, even when confirmed with Spitzer. If only a few
photometry data points are available, it becomes attractive to add criteria
based on their morphology in these J- and H-band images.
One could do so through visual inspection, a size criterion, or alternate
morphometrics. We explore a vetted sample of BoRG $z\sim9$ and $z\sim10$
candidate galaxies and the object rejected by Morishita+ (2018) to explore the
utility of a size criterion in z=9-10 candidate selection. A stringent,
PSF-corrected effective radius criterion ($r_e<0\farcs3$) would result in the
rejection of 65-70\% of the interlopers visually rejected by Morishita+. It may
also remove up to $\sim20$\% of bona-fide brightest ($L>>L^*$) z=9 or 10
candidates from a BoRG selected sample based on the Mason+ (2015) luminosity
functions, assuming the Holwerda+ (2015) $z\sim9$ size-luminosity relation. We
argue that including a size constraint in lieu of a visual inspection may serve
in wide-field searches for these objects in e.g. EUCLID or HST archival imaging
with the understanding that some brightest ($L>>L^*$) candidates may be missed.
The sizes of the candidates found by Morishita+ (2018) follow the expected
size distribution of $z\sim9$ for bright galaxies, consistent with the
lognormal in Shibuya+ (2015) and single objects. Two candidates show high
star-formation surface density ($\Sigma_{SFR} > 25 M_\odot/kpc^2$) and all
merit further investigation and follow-up observations. |
Author | Kusmic, Samir Bradley, Larry Bernard, Stephanie Livermore, Rachael Holwerda, Benne W Jacques, Alice Bridge, Joanna S Steele, Rebecca L |
Author_xml | – sequence: 1 givenname: Benne W surname: Holwerda fullname: Holwerda, Benne W organization: University of Louisville – sequence: 2 givenname: Joanna S surname: Bridge fullname: Bridge, Joanna S organization: University of Louisville – sequence: 3 givenname: Rebecca L surname: Steele fullname: Steele, Rebecca L organization: University of Louisville – sequence: 4 givenname: Samir surname: Kusmic fullname: Kusmic, Samir organization: University of Louisville – sequence: 5 givenname: Larry surname: Bradley fullname: Bradley, Larry organization: STSCI/Niels Bohr Institute – sequence: 6 givenname: Rachael surname: Livermore fullname: Livermore, Rachael organization: ARC DECRA Fellow – sequence: 7 givenname: Stephanie surname: Bernard fullname: Bernard, Stephanie organization: University of Melbourne – sequence: 8 givenname: Alice surname: Jacques fullname: Jacques, Alice organization: University of Louisville |
BackLink | https://doi.org/10.48550/arXiv.2005.03515$$DView paper in arXiv |
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Snippet | Redshift $z=9--10$ object selection is the effective limit of Hubble Space
Telescope imaging capability, even when confirmed with Spitzer. If only a few... |
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Title | The Sizes of $z\sim9-10$ Galaxies Identified in the BoRG Survey |
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