Newly Discovered Bright z\textasciitilde9-10 Galaxies and Improved Constraints on Their Prevalence Using the Full CANDELS Area

Newly Discovered Bright z\textasciitilde9-10 Galaxies and Improved Constraints on Their Prevalence Using the Full CANDELS Area. Bouwens, R. J., Stefanon, M., Oesch, P. A., Illingworth, G. D., Nanayakkara, T., Roberts-Borsani, G., Labbe', I., & Smit, R. arXiv e-prints, 1905:arXiv:1905.05202, May, 2019.
$Newly Discovered Bright z\textasciitilde9-10 Galaxies and Improved Constraints on Their Prevalence Using the Full CANDELS Area [link]$ Paper abstract bibtex

We report the results of an expanded search for z\textasciitilde9-10 candidates over the \textasciitilde883 arcmin\textasciicircum2 CANDELS+ERS fields. This study adds 147 arcmin\textasciicircum2 to the search area we consider over the CANDELS COSMOS, UDS, and EGS fields, while expanding our selection to include sources with bluer J_\125\-H_\160\ colors than our previous J_\125\-H_\160\\textgreater0.5 mag selection. In searching for new z\textasciitilde9-10 candidates, we make full use of all available HST, Spitzer/IRAC, and ground-based imaging data. As a result of our expanded search and use of broader color criteria, 3 new candidate z\textasciitilde9-10 galaxies are identified. We also find again the z=8.683 source previously confirmed by Zitrin+2015. This brings our sample of probable z\textasciitilde9-11 galaxy candidates over the CANDELS+ERS fields to 19 sources in total, equivalent to 1 candidate per 47 arcmin\textasciicircum2 (1 per 10 WFC3/IR fields). To be comprehensive, we also discuss 28 mostly lower likelihood z\textasciitilde9-10 candidates, including some sources that seem to be reliably at z\textgreater8 using the HST+IRAC data alone, but which the ground-based data show are much more likely at z\textless4. One case example is a bright z\textasciitilde9.4 candidate COS910-8 which seems instead to be at z\textasciitilde2. Based on this expanded sample, we obtain a more robust LF at z\textasciitilde9 and improved constraints on the volume density of bright z\textasciitilde9 and z\textasciitilde10 galaxies. Our improved z\textasciitilde9-10 results again reinforce previous findings for strong evolution in the UV LF at z\textgreater8, with a factor of \textasciitilde10 evolution seen in the luminosity density from z\textasciitilde10 to z\textasciitilde8.

@article{bouwens_newly_2019,
	title = {Newly {Discovered} {Bright} z{\textasciitilde}9-10 {Galaxies} and {Improved} {Constraints} on {Their} {Prevalence} {Using} the {Full} {CANDELS} {Area}},
	volume = {1905},
	url = {http://adsabs.harvard.edu/abs/2019arXiv190505202B},
	abstract = {We report the results of an expanded search for z{\textasciitilde}9-10 candidates over 
the {\textasciitilde}883 arcmin{\textasciicircum}2 CANDELS+ERS fields. This study adds 147 arcmin{\textasciicircum}2 to
the search area we consider over the CANDELS COSMOS, UDS, and EGS
fields, while expanding our selection to include sources with bluer
J\_\{125\}-H\_\{160\} colors than our previous J\_\{125\}-H\_\{160\}{\textgreater}0.5 mag
selection. In searching for new z{\textasciitilde}9-10 candidates, we make full use of
all available HST, Spitzer/IRAC, and ground-based imaging data. As a
result of our expanded search and use of broader color criteria, 3 new
candidate z{\textasciitilde}9-10 galaxies are identified. We also find again the z=8.683
source previously confirmed by Zitrin+2015. This brings our sample of
probable z{\textasciitilde}9-11 galaxy candidates over the CANDELS+ERS fields to 19
sources in total, equivalent to 1 candidate per 47 arcmin{\textasciicircum}2 (1 per 10
WFC3/IR fields). To be comprehensive, we also discuss 28 mostly lower
likelihood z{\textasciitilde}9-10 candidates, including some sources that seem to be
reliably at z{\textgreater}8 using the HST+IRAC data alone, but which the
ground-based data show are much more likely at z{\textless}4. One case example
is a bright z{\textasciitilde}9.4 candidate COS910-8 which seems instead to be at z{\textasciitilde}2.
Based on this expanded sample, we obtain a more robust LF at z{\textasciitilde}9 and
improved constraints on the volume density of bright z{\textasciitilde}9 and z{\textasciitilde}10
galaxies. Our improved z{\textasciitilde}9-10 results again reinforce previous findings
for strong evolution in the UV LF at z{\textgreater}8, with a factor of {\textasciitilde}10
evolution seen in the luminosity density from z{\textasciitilde}10 to z{\textasciitilde}8.},
	urldate = {2019-05-29},
	journal = {arXiv e-prints},
	author = {Bouwens, R. J. and Stefanon, M. and Oesch, P. A. and Illingworth, G. D. and Nanayakkara, T. and Roberts-Borsani, G. and Labbe', I. and Smit, R.},
	month = may,
	year = {2019},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:1905.05202},
}

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This study adds 147 arcmin\\textasciicircum2 to the search area we consider over the CANDELS COSMOS, UDS, and EGS fields, while expanding our selection to include sources with bluer J_\\125\\-H_\\160\\ colors than our previous J_\\125\\-H_\\160\\\\textgreater0.5 mag selection. In searching for new z\\textasciitilde9-10 candidates, we make full use of all available HST, Spitzer/IRAC, and ground-based imaging data. As a result of our expanded search and use of broader color criteria, 3 new candidate z\\textasciitilde9-10 galaxies are identified. We also find again the z=8.683 source previously confirmed by Zitrin+2015. This brings our sample of probable z\\textasciitilde9-11 galaxy candidates over the CANDELS+ERS fields to 19 sources in total, equivalent to 1 candidate per 47 arcmin\\textasciicircum2 (1 per 10 WFC3/IR fields). To be comprehensive, we also discuss 28 mostly lower likelihood z\\textasciitilde9-10 candidates, including some sources that seem to be reliably at z\\textgreater8 using the HST+IRAC data alone, but which the ground-based data show are much more likely at z\\textless4. One case example is a bright z\\textasciitilde9.4 candidate COS910-8 which seems instead to be at z\\textasciitilde2. Based on this expanded sample, we obtain a more robust LF at z\\textasciitilde9 and improved constraints on the volume density of bright z\\textasciitilde9 and z\\textasciitilde10 galaxies. Our improved z\\textasciitilde9-10 results again reinforce previous findings for strong evolution in the UV LF at z\\textgreater8, with a factor of \\textasciitilde10 evolution seen in the luminosity density from z\\textasciitilde10 to z\\textasciitilde8.","urldate":"2019-05-29","journal":"arXiv e-prints","author":[{"propositions":[],"lastnames":["Bouwens"],"firstnames":["R.","J."],"suffixes":[]},{"propositions":[],"lastnames":["Stefanon"],"firstnames":["M."],"suffixes":[]},{"propositions":[],"lastnames":["Oesch"],"firstnames":["P.","A."],"suffixes":[]},{"propositions":[],"lastnames":["Illingworth"],"firstnames":["G.","D."],"suffixes":[]},{"propositions":[],"lastnames":["Nanayakkara"],"firstnames":["T."],"suffixes":[]},{"propositions":[],"lastnames":["Roberts-Borsani"],"firstnames":["G."],"suffixes":[]},{"propositions":[],"lastnames":["Labbe'"],"firstnames":["I."],"suffixes":[]},{"propositions":[],"lastnames":["Smit"],"firstnames":["R."],"suffixes":[]}],"month":"May","year":"2019","keywords":"Astrophysics - Astrophysics of Galaxies","pages":"arXiv:1905.05202","bibtex":"@article{bouwens_newly_2019,\n\ttitle = {Newly {Discovered} {Bright} z{\\textasciitilde}9-10 {Galaxies} and {Improved} {Constraints} on {Their} {Prevalence} {Using} the {Full} {CANDELS} {Area}},\n\tvolume = {1905},\n\turl = {http://adsabs.harvard.edu/abs/2019arXiv190505202B},\n\tabstract = {We report the results of an expanded search for z{\\textasciitilde}9-10 candidates over \nthe {\\textasciitilde}883 arcmin{\\textasciicircum}2 CANDELS+ERS fields. This study adds 147 arcmin{\\textasciicircum}2 to\nthe search area we consider over the CANDELS COSMOS, UDS, and EGS\nfields, while expanding our selection to include sources with bluer\nJ\\_\\{125\\}-H\\_\\{160\\} colors than our previous J\\_\\{125\\}-H\\_\\{160\\}{\\textgreater}0.5 mag\nselection. In searching for new z{\\textasciitilde}9-10 candidates, we make full use of\nall available HST, Spitzer/IRAC, and ground-based imaging data. As a\nresult of our expanded search and use of broader color criteria, 3 new\ncandidate z{\\textasciitilde}9-10 galaxies are identified. We also find again the z=8.683\nsource previously confirmed by Zitrin+2015. This brings our sample of\nprobable z{\\textasciitilde}9-11 galaxy candidates over the CANDELS+ERS fields to 19\nsources in total, equivalent to 1 candidate per 47 arcmin{\\textasciicircum}2 (1 per 10\nWFC3/IR fields). 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