Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy

Matus Rybak; E. Da Cunha; B. Groves; J. A. Hodge; M. Aravena; M. Maseda; L. Boogaard; D. Berg; S. Charlot; R. Decarli; D. K. Erb; E. Nelson; C. Pacifici; K. B. Schmidt; F. Walter; A. Van Der Wel

doi:10.3847/1538-4357/abd946

Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy

Matus Rybak^*, E. Da Cunha, B. Groves, J. A. Hodge, M. Aravena, M. Maseda, L. Boogaard, D. Berg, S. Charlot, R. Decarli, D. K. Erb, E. Nelson, C. Pacifici, K. B. Schmidt, F. Walter, A. Van Der Wel

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Extreme emission-line galaxies (EELGs) at redshift z = 1-2 provide a unique view of metal-poor, starburst sources that are the likely drivers of the cosmic reionization at z ≥ 6. However, the molecular gas reservoirs of EELGs - the fuel for their intense star formation - remain beyond the reach of current facilities. We present ALMA [C ii] and PdBI CO(2-1) observations of the z = 1.8, strongly lensed EELG SL2S 0217, a bright Lyα emitter with a metallicity 0.05 Z o˙. We obtain a tentative (∼3σ-4σ) detection of the [C ii] line and set an upper limit on the [C ii]/SFR (star-forming rate) ratio of ≤1 106 L o˙/(M o˙ yr-1), based on the synthesized images and visibility-plane analysis. The CO(2-1) emission is not detected. Photoionization modeling indicates that up to 80% of the [C ii] emission originates from neutral or molecular gas, although we cannot rule out that the gas is fully ionized. The very faint [C ii] emission is in line with both nearby metal-poor dwarfs and high-redshift Lyα emitters, and predictions from hydrodynamical simulations. However, the [C ii] line is 30 fainter than predicted by the De Looze et al. [C ii]-SFR relation for local dwarfs, illustrating the danger of extrapolating locally calibrated relations to high-redshift, metal-poor galaxies.

Original language	English
Article number	130
Journal	Astrophysical Journal
Volume	909
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/abd946
Publication status	Published - 10 Mar 2021

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Rybak, M., Da Cunha, E., Groves, B., Hodge, J. A., Aravena, M., Maseda, M., Boogaard, L., Berg, D., Charlot, S., Decarli, R., Erb, D. K., Nelson, E., Pacifici, C., Schmidt, K. B., Walter, F., & Van Der Wel, A. (2021). Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy. Astrophysical Journal, 909(2), Article 130. https://doi.org/10.3847/1538-4357/abd946

@article{40c9e9f0f802452ab47f3d888887fc9c,

title = "Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy",

abstract = "Extreme emission-line galaxies (EELGs) at redshift z = 1-2 provide a unique view of metal-poor, starburst sources that are the likely drivers of the cosmic reionization at z ≥ 6. However, the molecular gas reservoirs of EELGs - the fuel for their intense star formation - remain beyond the reach of current facilities. We present ALMA [C ii] and PdBI CO(2-1) observations of the z = 1.8, strongly lensed EELG SL2S 0217, a bright Lyα emitter with a metallicity 0.05 Z o˙. We obtain a tentative (∼3σ-4σ) detection of the [C ii] line and set an upper limit on the [C ii]/SFR (star-forming rate) ratio of ≤1 106 L o˙/(M o˙ yr-1), based on the synthesized images and visibility-plane analysis. The CO(2-1) emission is not detected. Photoionization modeling indicates that up to 80% of the [C ii] emission originates from neutral or molecular gas, although we cannot rule out that the gas is fully ionized. The very faint [C ii] emission is in line with both nearby metal-poor dwarfs and high-redshift Lyα emitters, and predictions from hydrodynamical simulations. However, the [C ii] line is 30 fainter than predicted by the De Looze et al. [C ii]-SFR relation for local dwarfs, illustrating the danger of extrapolating locally calibrated relations to high-redshift, metal-poor galaxies.",

author = "Matus Rybak and {Da Cunha}, E. and B. Groves and Hodge, {J. A.} and M. Aravena and M. Maseda and L. Boogaard and D. Berg and S. Charlot and R. Decarli and Erb, {D. K.} and E. Nelson and C. Pacifici and Schmidt, {K. B.} and F. Walter and {Van Der Wel}, A.",

year = "2021",

month = mar,

day = "10",

doi = "10.3847/1538-4357/abd946",

language = "English",

volume = "909",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

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Rybak, M, Da Cunha, E, Groves, B, Hodge, JA, Aravena, M, Maseda, M, Boogaard, L, Berg, D, Charlot, S, Decarli, R, Erb, DK, Nelson, E, Pacifici, C, Schmidt, KB, Walter, F & Van Der Wel, A 2021, 'Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy', Astrophysical Journal, vol. 909, no. 2, 130. https://doi.org/10.3847/1538-4357/abd946

TY - JOUR

T1 - Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy

AU - Rybak, Matus

AU - Da Cunha, E.

AU - Groves, B.

AU - Hodge, J. A.

AU - Aravena, M.

AU - Maseda, M.

AU - Boogaard, L.

AU - Berg, D.

AU - Charlot, S.

AU - Decarli, R.

AU - Erb, D. K.

AU - Nelson, E.

AU - Pacifici, C.

AU - Schmidt, K. B.

AU - Walter, F.

AU - Van Der Wel, A.

PY - 2021/3/10

Y1 - 2021/3/10

N2 - Extreme emission-line galaxies (EELGs) at redshift z = 1-2 provide a unique view of metal-poor, starburst sources that are the likely drivers of the cosmic reionization at z ≥ 6. However, the molecular gas reservoirs of EELGs - the fuel for their intense star formation - remain beyond the reach of current facilities. We present ALMA [C ii] and PdBI CO(2-1) observations of the z = 1.8, strongly lensed EELG SL2S 0217, a bright Lyα emitter with a metallicity 0.05 Z o˙. We obtain a tentative (∼3σ-4σ) detection of the [C ii] line and set an upper limit on the [C ii]/SFR (star-forming rate) ratio of ≤1 106 L o˙/(M o˙ yr-1), based on the synthesized images and visibility-plane analysis. The CO(2-1) emission is not detected. Photoionization modeling indicates that up to 80% of the [C ii] emission originates from neutral or molecular gas, although we cannot rule out that the gas is fully ionized. The very faint [C ii] emission is in line with both nearby metal-poor dwarfs and high-redshift Lyα emitters, and predictions from hydrodynamical simulations. However, the [C ii] line is 30 fainter than predicted by the De Looze et al. [C ii]-SFR relation for local dwarfs, illustrating the danger of extrapolating locally calibrated relations to high-redshift, metal-poor galaxies.

AB - Extreme emission-line galaxies (EELGs) at redshift z = 1-2 provide a unique view of metal-poor, starburst sources that are the likely drivers of the cosmic reionization at z ≥ 6. However, the molecular gas reservoirs of EELGs - the fuel for their intense star formation - remain beyond the reach of current facilities. We present ALMA [C ii] and PdBI CO(2-1) observations of the z = 1.8, strongly lensed EELG SL2S 0217, a bright Lyα emitter with a metallicity 0.05 Z o˙. We obtain a tentative (∼3σ-4σ) detection of the [C ii] line and set an upper limit on the [C ii]/SFR (star-forming rate) ratio of ≤1 106 L o˙/(M o˙ yr-1), based on the synthesized images and visibility-plane analysis. The CO(2-1) emission is not detected. Photoionization modeling indicates that up to 80% of the [C ii] emission originates from neutral or molecular gas, although we cannot rule out that the gas is fully ionized. The very faint [C ii] emission is in line with both nearby metal-poor dwarfs and high-redshift Lyα emitters, and predictions from hydrodynamical simulations. However, the [C ii] line is 30 fainter than predicted by the De Looze et al. [C ii]-SFR relation for local dwarfs, illustrating the danger of extrapolating locally calibrated relations to high-redshift, metal-poor galaxies.

UR - http://www.scopus.com/inward/record.url?scp=85103300490&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/abd946

DO - 10.3847/1538-4357/abd946

M3 - Article

SN - 0004-637X

VL - 909

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 130

ER -

Ultrafaint [C ii] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy

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