Publication

Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7

Castellano, M., Pentericci, L., Vanzella, E., Marchi, F., Fontana, A., Dayal, P., Ferrara, A., Hutter, A., Carniani, S., Cristiani, S., Dickinson, M., Gallerani, S., Giallongo, E., Giavalisco, M., Grazian, A., Maiolino, R., Merlin, E., Paris, D., Pilo, S. & Santini, P., 10-Aug-2018, In : Astrophysical Journal Letters. 863, 1, 7 p., 3.

Research output: Contribution to journalArticleAcademicpeer-review

APA

Castellano, M., Pentericci, L., Vanzella, E., Marchi, F., Fontana, A., Dayal, P., ... Santini, P. (2018). Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7. Astrophysical Journal Letters, 863(1), [3]. https://doi.org/10.3847/2041-8213/aad59b

Author

Castellano, M. ; Pentericci, L. ; Vanzella, E. ; Marchi, F. ; Fontana, A. ; Dayal, P. ; Ferrara, A. ; Hutter, A. ; Carniani, S. ; Cristiani, S. ; Dickinson, M. ; Gallerani, S. ; Giallongo, E. ; Giavalisco, M. ; Grazian, A. ; Maiolino, R. ; Merlin, E. ; Paris, D. ; Pilo, S. ; Santini, P. / Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7. In: Astrophysical Journal Letters. 2018 ; Vol. 863, No. 1.

Harvard

Castellano, M, Pentericci, L, Vanzella, E, Marchi, F, Fontana, A, Dayal, P, Ferrara, A, Hutter, A, Carniani, S, Cristiani, S, Dickinson, M, Gallerani, S, Giallongo, E, Giavalisco, M, Grazian, A, Maiolino, R, Merlin, E, Paris, D, Pilo, S & Santini, P 2018, 'Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7' Astrophysical Journal Letters, vol. 863, no. 1, 3. https://doi.org/10.3847/2041-8213/aad59b

Standard

Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7. / Castellano, M.; Pentericci, L.; Vanzella, E.; Marchi, F.; Fontana, A.; Dayal, P.; Ferrara, A.; Hutter, A.; Carniani, S.; Cristiani, S.; Dickinson, M.; Gallerani, S.; Giallongo, E.; Giavalisco, M.; Grazian, A.; Maiolino, R.; Merlin, E.; Paris, D.; Pilo, S.; Santini, P.

In: Astrophysical Journal Letters, Vol. 863, No. 1, 3, 10.08.2018.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Castellano M, Pentericci L, Vanzella E, Marchi F, Fontana A, Dayal P et al. Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7. Astrophysical Journal Letters. 2018 Aug 10;863(1). 3. https://doi.org/10.3847/2041-8213/aad59b


BibTeX

@article{f9279209122c4212bbf79494880b4b21,
title = "Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7",
abstract = "We present deep spectroscopic follow-up observations of the Bremer Deep Field (BDF), where the two z similar to 7 bright Ly alpha emitters (LAE) BDF521 and BDF3299 were previously discovered by Vanzella et al. and where a factor of similar to 3-4 overdensity of faint LBGs has been found by Castellano et al. We confirm a new bright Ly alpha emitter, BDF2195, at the same redshift of BDF521, z = 7.008 and at only similar to 90 kpc physical distance from it, confirming that the BDF area is likely an overdense, reionized region. A quantitative assessment of the Ly alpha fraction shows that the number of detected bright emitters is much higher than the average found at z similar to 7, suggesting a high Ly alpha transmission through the intergalactic medium. However, the line visibility from fainter galaxies is at odds with this finding, as no Ly alpha emission is found in any of the observed candidates with M-UV > -20.25. This discrepancy can be understood either if some mechanism prevents Ly alpha emission from fainter galaxies within the ionized bubbles from reaching the observer, or if faint galaxies are located outside the reionized area and bright LAEs are solely responsible for the creation of their own H II regions. A thorough assessment of the nature of the BDF region and of its sources of re-ionizing radiation will be made possible by James Webb Space Telescope spectroscopic capabilities.",
keywords = "dark ages, reionization, first stars, galaxies: evolution, galaxies: high-redshift, LYMAN-ALPHA EMISSION, SIMILAR-TO 7, LY-ALPHA, RADIO GALAXIES, BREAK GALAXIES, VISIBILITY, REDSHIFTS, EMITTERS, FRACTION, UNIVERSE",
author = "M. Castellano and L. Pentericci and E. Vanzella and F. Marchi and A. Fontana and P. Dayal and A. Ferrara and A. Hutter and S. Carniani and S. Cristiani and M. Dickinson and S. Gallerani and E. Giallongo and M. Giavalisco and A. Grazian and R. Maiolino and E. Merlin and D. Paris and S. Pilo and P. Santini",
note = "Accepted for publication in The Astrophysical Journal Letters. 6 pages, 3 figures",
year = "2018",
month = "8",
day = "10",
doi = "10.3847/2041-8213/aad59b",
language = "English",
volume = "863",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP PUBLISHING LTD",
number = "1",

}

RIS

TY - JOUR

T1 - Spectroscopic Investigation of a Reionized Galaxy Overdensity at z=7

AU - Castellano, M.

AU - Pentericci, L.

AU - Vanzella, E.

AU - Marchi, F.

AU - Fontana, A.

AU - Dayal, P.

AU - Ferrara, A.

AU - Hutter, A.

AU - Carniani, S.

AU - Cristiani, S.

AU - Dickinson, M.

AU - Gallerani, S.

AU - Giallongo, E.

AU - Giavalisco, M.

AU - Grazian, A.

AU - Maiolino, R.

AU - Merlin, E.

AU - Paris, D.

AU - Pilo, S.

AU - Santini, P.

N1 - Accepted for publication in The Astrophysical Journal Letters. 6 pages, 3 figures

PY - 2018/8/10

Y1 - 2018/8/10

N2 - We present deep spectroscopic follow-up observations of the Bremer Deep Field (BDF), where the two z similar to 7 bright Ly alpha emitters (LAE) BDF521 and BDF3299 were previously discovered by Vanzella et al. and where a factor of similar to 3-4 overdensity of faint LBGs has been found by Castellano et al. We confirm a new bright Ly alpha emitter, BDF2195, at the same redshift of BDF521, z = 7.008 and at only similar to 90 kpc physical distance from it, confirming that the BDF area is likely an overdense, reionized region. A quantitative assessment of the Ly alpha fraction shows that the number of detected bright emitters is much higher than the average found at z similar to 7, suggesting a high Ly alpha transmission through the intergalactic medium. However, the line visibility from fainter galaxies is at odds with this finding, as no Ly alpha emission is found in any of the observed candidates with M-UV > -20.25. This discrepancy can be understood either if some mechanism prevents Ly alpha emission from fainter galaxies within the ionized bubbles from reaching the observer, or if faint galaxies are located outside the reionized area and bright LAEs are solely responsible for the creation of their own H II regions. A thorough assessment of the nature of the BDF region and of its sources of re-ionizing radiation will be made possible by James Webb Space Telescope spectroscopic capabilities.

AB - We present deep spectroscopic follow-up observations of the Bremer Deep Field (BDF), where the two z similar to 7 bright Ly alpha emitters (LAE) BDF521 and BDF3299 were previously discovered by Vanzella et al. and where a factor of similar to 3-4 overdensity of faint LBGs has been found by Castellano et al. We confirm a new bright Ly alpha emitter, BDF2195, at the same redshift of BDF521, z = 7.008 and at only similar to 90 kpc physical distance from it, confirming that the BDF area is likely an overdense, reionized region. A quantitative assessment of the Ly alpha fraction shows that the number of detected bright emitters is much higher than the average found at z similar to 7, suggesting a high Ly alpha transmission through the intergalactic medium. However, the line visibility from fainter galaxies is at odds with this finding, as no Ly alpha emission is found in any of the observed candidates with M-UV > -20.25. This discrepancy can be understood either if some mechanism prevents Ly alpha emission from fainter galaxies within the ionized bubbles from reaching the observer, or if faint galaxies are located outside the reionized area and bright LAEs are solely responsible for the creation of their own H II regions. A thorough assessment of the nature of the BDF region and of its sources of re-ionizing radiation will be made possible by James Webb Space Telescope spectroscopic capabilities.

KW - dark ages, reionization, first stars

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - LYMAN-ALPHA EMISSION

KW - SIMILAR-TO 7

KW - LY-ALPHA

KW - RADIO GALAXIES

KW - BREAK GALAXIES

KW - VISIBILITY

KW - REDSHIFTS

KW - EMITTERS

KW - FRACTION

KW - UNIVERSE

UR - https://arxiv.org/abs/1807.09277

U2 - 10.3847/2041-8213/aad59b

DO - 10.3847/2041-8213/aad59b

M3 - Article

VL - 863

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - 3

ER -

ID: 66206114