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LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field

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Standard

LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field. / Gloudemans, A. J.; Duncan, K. J.; Kondapally, R.; Sabater, J.; Cochrane, R. K.; Röttgering, H. J. A.; Best, P. N.; Bonato, M.; Bondi, M.; Malek, K.; McCheyne, I.; Smith, D. J. B.; Prandoni, I.; Wang, L.

In: Astronomy & Astrophysics, Vol. 648, A7, 07.04.2021.

Research output: Contribution to journalArticlepeer-review

Harvard

Gloudemans, AJ, Duncan, KJ, Kondapally, R, Sabater, J, Cochrane, RK, Röttgering, HJA, Best, PN, Bonato, M, Bondi, M, Malek, K, McCheyne, I, Smith, DJB, Prandoni, I & Wang, L 2021, 'LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field', Astronomy & Astrophysics, vol. 648, A7. https://doi.org/10.1051/0004-6361/202038819

APA

Gloudemans, A. J., Duncan, K. J., Kondapally, R., Sabater, J., Cochrane, R. K., Röttgering, H. J. A., Best, P. N., Bonato, M., Bondi, M., Malek, K., McCheyne, I., Smith, D. J. B., Prandoni, I., & Wang, L. (2021). LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field. Astronomy & Astrophysics, 648, [A7]. https://doi.org/10.1051/0004-6361/202038819

Vancouver

Gloudemans AJ, Duncan KJ, Kondapally R, Sabater J, Cochrane RK, Röttgering HJA et al. LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field. Astronomy & Astrophysics. 2021 Apr 7;648. A7. https://doi.org/10.1051/0004-6361/202038819

Author

Gloudemans, A. J. ; Duncan, K. J. ; Kondapally, R. ; Sabater, J. ; Cochrane, R. K. ; Röttgering, H. J. A. ; Best, P. N. ; Bonato, M. ; Bondi, M. ; Malek, K. ; McCheyne, I. ; Smith, D. J. B. ; Prandoni, I. ; Wang, L. / LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field. In: Astronomy & Astrophysics. 2021 ; Vol. 648.

Bibtex

@article{1f0d7e8363394db885863d438a56e0ad,
title = "LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field",
abstract = " Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of early galaxy evolution and the process of reionization; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at $z=5.7$ and $z=6.6,$ respectively, from the SILVERRUSH narrowband survey with deep Low Frequency Array (LOFAR) radio continuum observations in the ELAIS-N1 field to search for radio galaxies in the EoR and study the low-frequency radio properties of $z\gtrsim5.7$ LAE emitters. Our LOFAR observations reach an unprecedented noise level of $\sim20\,\mu$Jy beam$^{-1}$ at 150MHz, and we detect five candidate LAEs at $>5\sigma$ significance. Based on detailed spectral energy distribution modelling of independent multi-wavelength observations, we conclude that these sources are likely [OII] emitters at $z=1.47$, yielding no reliable $z\gtrsim5.7$ radio galaxy candidates. We examine the 111 $z=5.7$ and $z=6.6$ LAE candidates from our panchromatic photometry catalogue that are undetected by LOFAR, finding contamination rates of 81-92% for the $z=5.7$ and $z=6.6$ subset of the LAE candidate samples. This subset is biased towards brighter magnitudes and redder near-infrared colours. The contamination rates of the full sample will therefore likely be lower than the reported values. Contamination is lowered significantly through constraints on the near-infrared colours, highlighting the need for infrared observations to robustly identify bright LAEs in narrowband surveys. Finally, the stacking of radio continuum observations for the robust LAE samples yields 2$\sigma$ upper limits on radio luminosity of 8.2$\times$10$^{23}$ and 8.7$\times$10$^{23}$ W Hz$^{-1}$ at $z=5.7$ and $6.6$, respectively, corresponding to limits on their median star-formation rates of $",
keywords = "astro-ph.GA",
author = "Gloudemans, {A. J.} and Duncan, {K. J.} and R. Kondapally and J. Sabater and Cochrane, {R. K.} and R{\"o}ttgering, {H. J. A.} and Best, {P. N.} and M. Bonato and M. Bondi and K. Malek and I. McCheyne and Smith, {D. J. B.} and I. Prandoni and L. Wang",
note = "{\textcopyright} 2020 ESO",
year = "2021",
month = apr,
day = "7",
doi = "10.1051/0004-6361/202038819",
language = "English",
volume = "648",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

RIS

TY - JOUR

T1 - LOFAR Properties of SILVERRUSH Lya emitter candidates in the ELAIS-N1 Field

AU - Gloudemans, A. J.

AU - Duncan, K. J.

AU - Kondapally, R.

AU - Sabater, J.

AU - Cochrane, R. K.

AU - Röttgering, H. J. A.

AU - Best, P. N.

AU - Bonato, M.

AU - Bondi, M.

AU - Malek, K.

AU - McCheyne, I.

AU - Smith, D. J. B.

AU - Prandoni, I.

AU - Wang, L.

N1 - © 2020 ESO

PY - 2021/4/7

Y1 - 2021/4/7

N2 - Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of early galaxy evolution and the process of reionization; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at $z=5.7$ and $z=6.6,$ respectively, from the SILVERRUSH narrowband survey with deep Low Frequency Array (LOFAR) radio continuum observations in the ELAIS-N1 field to search for radio galaxies in the EoR and study the low-frequency radio properties of $z\gtrsim5.7$ LAE emitters. Our LOFAR observations reach an unprecedented noise level of $\sim20\,\mu$Jy beam$^{-1}$ at 150MHz, and we detect five candidate LAEs at $>5\sigma$ significance. Based on detailed spectral energy distribution modelling of independent multi-wavelength observations, we conclude that these sources are likely [OII] emitters at $z=1.47$, yielding no reliable $z\gtrsim5.7$ radio galaxy candidates. We examine the 111 $z=5.7$ and $z=6.6$ LAE candidates from our panchromatic photometry catalogue that are undetected by LOFAR, finding contamination rates of 81-92% for the $z=5.7$ and $z=6.6$ subset of the LAE candidate samples. This subset is biased towards brighter magnitudes and redder near-infrared colours. The contamination rates of the full sample will therefore likely be lower than the reported values. Contamination is lowered significantly through constraints on the near-infrared colours, highlighting the need for infrared observations to robustly identify bright LAEs in narrowband surveys. Finally, the stacking of radio continuum observations for the robust LAE samples yields 2$\sigma$ upper limits on radio luminosity of 8.2$\times$10$^{23}$ and 8.7$\times$10$^{23}$ W Hz$^{-1}$ at $z=5.7$ and $6.6$, respectively, corresponding to limits on their median star-formation rates of $

AB - Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of early galaxy evolution and the process of reionization; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at $z=5.7$ and $z=6.6,$ respectively, from the SILVERRUSH narrowband survey with deep Low Frequency Array (LOFAR) radio continuum observations in the ELAIS-N1 field to search for radio galaxies in the EoR and study the low-frequency radio properties of $z\gtrsim5.7$ LAE emitters. Our LOFAR observations reach an unprecedented noise level of $\sim20\,\mu$Jy beam$^{-1}$ at 150MHz, and we detect five candidate LAEs at $>5\sigma$ significance. Based on detailed spectral energy distribution modelling of independent multi-wavelength observations, we conclude that these sources are likely [OII] emitters at $z=1.47$, yielding no reliable $z\gtrsim5.7$ radio galaxy candidates. We examine the 111 $z=5.7$ and $z=6.6$ LAE candidates from our panchromatic photometry catalogue that are undetected by LOFAR, finding contamination rates of 81-92% for the $z=5.7$ and $z=6.6$ subset of the LAE candidate samples. This subset is biased towards brighter magnitudes and redder near-infrared colours. The contamination rates of the full sample will therefore likely be lower than the reported values. Contamination is lowered significantly through constraints on the near-infrared colours, highlighting the need for infrared observations to robustly identify bright LAEs in narrowband surveys. Finally, the stacking of radio continuum observations for the robust LAE samples yields 2$\sigma$ upper limits on radio luminosity of 8.2$\times$10$^{23}$ and 8.7$\times$10$^{23}$ W Hz$^{-1}$ at $z=5.7$ and $6.6$, respectively, corresponding to limits on their median star-formation rates of $

KW - astro-ph.GA

U2 - 10.1051/0004-6361/202038819

DO - 10.1051/0004-6361/202038819

M3 - Article

VL - 648

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A7

ER -