Lyman continuum escape fraction of faint galaxies at z ∼ 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC aãÜ

A. Grazian, E. Giallongo, D. Paris, K. Boutsia, M. Dickinson, P. Santini, Rogier Windhorst, R. A. Jansen, S. H. Cohen, T. A. Ashcraft, C. Scarlata, M. J. Rutkowski, E. Vanzella, F. Cusano, S. Cristiani, M. Giavalisco, H. C. Ferguson, A. Koekemoer, N. A. Grogin, M. Castellano & 24 others F. Fiore, A. Fontana, F. Marchi, F. Pedichini, L. Pentericci, R. Amorín, G. Barro, A. Bonchi, A. Bongiorno, S. M. Faber, M. Fumana, A. Galametz, L. Guaita, D. D. Kocevski, E. Merlin, M. Nonino, R. W. O'Connell, S. Pilo, R. E. Ryan, E. Sani, R. Speziali, V. Testa, B. Weiner, H. Yan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Context. The reionization of the Universe is one of the most important topics of present-day astrophysical research. The most plausible candidates for the reionization process are star-forming galaxies, which according to the predictions of the majority of the theoretical and semi-Analytical models should dominate the Hi ionizing background at z & 3. Aims. We measure the Lyman continuum escape fraction, which is one of the key parameters used to compute the contribution of star-forming galaxies to the UV background. It provides the ratio between the photons produced at λ > 912 A rest-frame and those that are able to reach the inter-galactic medium, i.e.That are not absorbed by the neutral hydrogen or by the dust of the galaxyos inter-stellar medium. Methods. We used ultra-deep U-band imaging (U = 30:2 mag at 1σ) from Large Binocular Camera at the Large Binocular Telescope (LBC/LBT) in the CANDELS/GOODS-North field and deep imaging in the COSMOS and EGS fields in order to estimate the Lyman continuum escape fraction of 69 star-forming galaxies with secure spectroscopic redshifts at 3:27 ≥ z ≥ 3:40 to faint magnitude limits (L = 0:2L∗, or equivalently M1500 19). The narrow redshift range implies that the LBC U-band filter exclusively samples the - 912 A rest-frame wavelengths. Results. We measured through stacks a stringent upper limit (<1.7% at 1σ) for the relative escape fraction of Hi ionizing photons from bright galaxies (L < L∗), while for the faint population (L = 0:2L∗) the limit to the escape fraction is .10%.We computed the contribution of star-forming galaxies to the observed UV background at z ∼ 3 and find that it is not su-cient to keep the Universe ionized at these redshifts unless their escape fraction increases significantly (10%) at low luminosities (M1500 ≥-19). Conclusions. We compare our results on the Lyman continuum escape fraction of high-z galaxies with recent estimates in the literature, and discuss future prospects to shed light on the end of the Dark Ages. In the future, strong gravitational lensing will be fundamental in order to measure the Lyman continuum escape fraction down to faint magnitudes (M1500-16) that are inaccessible with the present instrumentation on blank fields. These results will be important in order to quantify the role of faint galaxies to the reionization budget.

Original languageEnglish (US)
Article numberA18
JournalAstronomy and Astrophysics
Volume602
DOIs
StatePublished - Jun 1 2017

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COSMOS
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Keywords

  • Galaxies: distances and redshifts
  • Galaxies: evolution
  • Galaxies: high-redshift
  • Galaxies: photometry

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lyman continuum escape fraction of faint galaxies at z ∼ 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC aãÜ. / Grazian, A.; Giallongo, E.; Paris, D.; Boutsia, K.; Dickinson, M.; Santini, P.; Windhorst, Rogier; Jansen, R. A.; Cohen, S. H.; Ashcraft, T. A.; Scarlata, C.; Rutkowski, M. J.; Vanzella, E.; Cusano, F.; Cristiani, S.; Giavalisco, M.; Ferguson, H. C.; Koekemoer, A.; Grogin, N. A.; Castellano, M.; Fiore, F.; Fontana, A.; Marchi, F.; Pedichini, F.; Pentericci, L.; Amorín, R.; Barro, G.; Bonchi, A.; Bongiorno, A.; Faber, S. M.; Fumana, M.; Galametz, A.; Guaita, L.; Kocevski, D. D.; Merlin, E.; Nonino, M.; O'Connell, R. W.; Pilo, S.; Ryan, R. E.; Sani, E.; Speziali, R.; Testa, V.; Weiner, B.; Yan, H.

In: Astronomy and Astrophysics, Vol. 602, A18, 01.06.2017.

Research output: Contribution to journalArticle

Grazian, A, Giallongo, E, Paris, D, Boutsia, K, Dickinson, M, Santini, P, Windhorst, R, Jansen, RA, Cohen, SH, Ashcraft, TA, Scarlata, C, Rutkowski, MJ, Vanzella, E, Cusano, F, Cristiani, S, Giavalisco, M, Ferguson, HC, Koekemoer, A, Grogin, NA, Castellano, M, Fiore, F, Fontana, A, Marchi, F, Pedichini, F, Pentericci, L, Amorín, R, Barro, G, Bonchi, A, Bongiorno, A, Faber, SM, Fumana, M, Galametz, A, Guaita, L, Kocevski, DD, Merlin, E, Nonino, M, O'Connell, RW, Pilo, S, Ryan, RE, Sani, E, Speziali, R, Testa, V, Weiner, B & Yan, H 2017, 'Lyman continuum escape fraction of faint galaxies at z ∼ 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC aãÜ', Astronomy and Astrophysics, vol. 602, A18. https://doi.org/10.1051/0004-6361/201730447
Grazian, A. ; Giallongo, E. ; Paris, D. ; Boutsia, K. ; Dickinson, M. ; Santini, P. ; Windhorst, Rogier ; Jansen, R. A. ; Cohen, S. H. ; Ashcraft, T. A. ; Scarlata, C. ; Rutkowski, M. J. ; Vanzella, E. ; Cusano, F. ; Cristiani, S. ; Giavalisco, M. ; Ferguson, H. C. ; Koekemoer, A. ; Grogin, N. A. ; Castellano, M. ; Fiore, F. ; Fontana, A. ; Marchi, F. ; Pedichini, F. ; Pentericci, L. ; Amorín, R. ; Barro, G. ; Bonchi, A. ; Bongiorno, A. ; Faber, S. M. ; Fumana, M. ; Galametz, A. ; Guaita, L. ; Kocevski, D. D. ; Merlin, E. ; Nonino, M. ; O'Connell, R. W. ; Pilo, S. ; Ryan, R. E. ; Sani, E. ; Speziali, R. ; Testa, V. ; Weiner, B. ; Yan, H. / Lyman continuum escape fraction of faint galaxies at z ∼ 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC aãÜ. In: Astronomy and Astrophysics. 2017 ; Vol. 602.
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title = "Lyman continuum escape fraction of faint galaxies at z ∼ 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC a{\~a}{\"U}",
abstract = "Context. The reionization of the Universe is one of the most important topics of present-day astrophysical research. The most plausible candidates for the reionization process are star-forming galaxies, which according to the predictions of the majority of the theoretical and semi-Analytical models should dominate the Hi ionizing background at z & 3. Aims. We measure the Lyman continuum escape fraction, which is one of the key parameters used to compute the contribution of star-forming galaxies to the UV background. It provides the ratio between the photons produced at λ > 912 A rest-frame and those that are able to reach the inter-galactic medium, i.e.That are not absorbed by the neutral hydrogen or by the dust of the galaxyos inter-stellar medium. Methods. We used ultra-deep U-band imaging (U = 30:2 mag at 1σ) from Large Binocular Camera at the Large Binocular Telescope (LBC/LBT) in the CANDELS/GOODS-North field and deep imaging in the COSMOS and EGS fields in order to estimate the Lyman continuum escape fraction of 69 star-forming galaxies with secure spectroscopic redshifts at 3:27 ≥ z ≥ 3:40 to faint magnitude limits (L = 0:2L∗, or equivalently M1500 19). The narrow redshift range implies that the LBC U-band filter exclusively samples the - 912 A rest-frame wavelengths. Results. We measured through stacks a stringent upper limit (<1.7{\%} at 1σ) for the relative escape fraction of Hi ionizing photons from bright galaxies (L < L∗), while for the faint population (L = 0:2L∗) the limit to the escape fraction is .10{\%}.We computed the contribution of star-forming galaxies to the observed UV background at z ∼ 3 and find that it is not su-cient to keep the Universe ionized at these redshifts unless their escape fraction increases significantly (10{\%}) at low luminosities (M1500 ≥-19). Conclusions. We compare our results on the Lyman continuum escape fraction of high-z galaxies with recent estimates in the literature, and discuss future prospects to shed light on the end of the Dark Ages. In the future, strong gravitational lensing will be fundamental in order to measure the Lyman continuum escape fraction down to faint magnitudes (M1500-16) that are inaccessible with the present instrumentation on blank fields. These results will be important in order to quantify the role of faint galaxies to the reionization budget.",
keywords = "Galaxies: distances and redshifts, Galaxies: evolution, Galaxies: high-redshift, Galaxies: photometry",
author = "A. Grazian and E. Giallongo and D. Paris and K. Boutsia and M. Dickinson and P. Santini and Rogier Windhorst and Jansen, {R. A.} and Cohen, {S. H.} and Ashcraft, {T. A.} and C. Scarlata and Rutkowski, {M. J.} and E. Vanzella and F. Cusano and S. Cristiani and M. Giavalisco and Ferguson, {H. C.} and A. Koekemoer and Grogin, {N. A.} and M. Castellano and F. Fiore and A. Fontana and F. Marchi and F. Pedichini and L. Pentericci and R. Amor{\'i}n and G. Barro and A. Bonchi and A. Bongiorno and Faber, {S. M.} and M. Fumana and A. Galametz and L. Guaita and Kocevski, {D. D.} and E. Merlin and M. Nonino and O'Connell, {R. W.} and S. Pilo and Ryan, {R. E.} and E. Sani and R. Speziali and V. Testa and B. Weiner and H. Yan",
year = "2017",
month = "6",
day = "1",
doi = "10.1051/0004-6361/201730447",
language = "English (US)",
volume = "602",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

TY - JOUR

T1 - Lyman continuum escape fraction of faint galaxies at z ∼ 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC aãÜ

AU - Grazian, A.

AU - Giallongo, E.

AU - Paris, D.

AU - Boutsia, K.

AU - Dickinson, M.

AU - Santini, P.

AU - Windhorst, Rogier

AU - Jansen, R. A.

AU - Cohen, S. H.

AU - Ashcraft, T. A.

AU - Scarlata, C.

AU - Rutkowski, M. J.

AU - Vanzella, E.

AU - Cusano, F.

AU - Cristiani, S.

AU - Giavalisco, M.

AU - Ferguson, H. C.

AU - Koekemoer, A.

AU - Grogin, N. A.

AU - Castellano, M.

AU - Fiore, F.

AU - Fontana, A.

AU - Marchi, F.

AU - Pedichini, F.

AU - Pentericci, L.

AU - Amorín, R.

AU - Barro, G.

AU - Bonchi, A.

AU - Bongiorno, A.

AU - Faber, S. M.

AU - Fumana, M.

AU - Galametz, A.

AU - Guaita, L.

AU - Kocevski, D. D.

AU - Merlin, E.

AU - Nonino, M.

AU - O'Connell, R. W.

AU - Pilo, S.

AU - Ryan, R. E.

AU - Sani, E.

AU - Speziali, R.

AU - Testa, V.

AU - Weiner, B.

AU - Yan, H.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Context. The reionization of the Universe is one of the most important topics of present-day astrophysical research. The most plausible candidates for the reionization process are star-forming galaxies, which according to the predictions of the majority of the theoretical and semi-Analytical models should dominate the Hi ionizing background at z & 3. Aims. We measure the Lyman continuum escape fraction, which is one of the key parameters used to compute the contribution of star-forming galaxies to the UV background. It provides the ratio between the photons produced at λ > 912 A rest-frame and those that are able to reach the inter-galactic medium, i.e.That are not absorbed by the neutral hydrogen or by the dust of the galaxyos inter-stellar medium. Methods. We used ultra-deep U-band imaging (U = 30:2 mag at 1σ) from Large Binocular Camera at the Large Binocular Telescope (LBC/LBT) in the CANDELS/GOODS-North field and deep imaging in the COSMOS and EGS fields in order to estimate the Lyman continuum escape fraction of 69 star-forming galaxies with secure spectroscopic redshifts at 3:27 ≥ z ≥ 3:40 to faint magnitude limits (L = 0:2L∗, or equivalently M1500 19). The narrow redshift range implies that the LBC U-band filter exclusively samples the - 912 A rest-frame wavelengths. Results. We measured through stacks a stringent upper limit (<1.7% at 1σ) for the relative escape fraction of Hi ionizing photons from bright galaxies (L < L∗), while for the faint population (L = 0:2L∗) the limit to the escape fraction is .10%.We computed the contribution of star-forming galaxies to the observed UV background at z ∼ 3 and find that it is not su-cient to keep the Universe ionized at these redshifts unless their escape fraction increases significantly (10%) at low luminosities (M1500 ≥-19). Conclusions. We compare our results on the Lyman continuum escape fraction of high-z galaxies with recent estimates in the literature, and discuss future prospects to shed light on the end of the Dark Ages. In the future, strong gravitational lensing will be fundamental in order to measure the Lyman continuum escape fraction down to faint magnitudes (M1500-16) that are inaccessible with the present instrumentation on blank fields. These results will be important in order to quantify the role of faint galaxies to the reionization budget.

AB - Context. The reionization of the Universe is one of the most important topics of present-day astrophysical research. The most plausible candidates for the reionization process are star-forming galaxies, which according to the predictions of the majority of the theoretical and semi-Analytical models should dominate the Hi ionizing background at z & 3. Aims. We measure the Lyman continuum escape fraction, which is one of the key parameters used to compute the contribution of star-forming galaxies to the UV background. It provides the ratio between the photons produced at λ > 912 A rest-frame and those that are able to reach the inter-galactic medium, i.e.That are not absorbed by the neutral hydrogen or by the dust of the galaxyos inter-stellar medium. Methods. We used ultra-deep U-band imaging (U = 30:2 mag at 1σ) from Large Binocular Camera at the Large Binocular Telescope (LBC/LBT) in the CANDELS/GOODS-North field and deep imaging in the COSMOS and EGS fields in order to estimate the Lyman continuum escape fraction of 69 star-forming galaxies with secure spectroscopic redshifts at 3:27 ≥ z ≥ 3:40 to faint magnitude limits (L = 0:2L∗, or equivalently M1500 19). The narrow redshift range implies that the LBC U-band filter exclusively samples the - 912 A rest-frame wavelengths. Results. We measured through stacks a stringent upper limit (<1.7% at 1σ) for the relative escape fraction of Hi ionizing photons from bright galaxies (L < L∗), while for the faint population (L = 0:2L∗) the limit to the escape fraction is .10%.We computed the contribution of star-forming galaxies to the observed UV background at z ∼ 3 and find that it is not su-cient to keep the Universe ionized at these redshifts unless their escape fraction increases significantly (10%) at low luminosities (M1500 ≥-19). Conclusions. We compare our results on the Lyman continuum escape fraction of high-z galaxies with recent estimates in the literature, and discuss future prospects to shed light on the end of the Dark Ages. In the future, strong gravitational lensing will be fundamental in order to measure the Lyman continuum escape fraction down to faint magnitudes (M1500-16) that are inaccessible with the present instrumentation on blank fields. These results will be important in order to quantify the role of faint galaxies to the reionization budget.

KW - Galaxies: distances and redshifts

KW - Galaxies: evolution

KW - Galaxies: high-redshift

KW - Galaxies: photometry

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U2 - 10.1051/0004-6361/201730447

DO - 10.1051/0004-6361/201730447

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VL - 602

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

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