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

Author

Grazian, A, Giallongo, E, Paris, D, Boutsia, K, Dickinson, M, Santini, P, Windhorst, RA, 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, Amorin Barbieri, Ricardo [0000-0001-5758-1000], and Apollo - University of Cambridge Repository

Subjects
galaxies: photometry, galaxies: high-redshift, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: distances and redshifts, galaxies: evolution, Astrophysics::Galaxy Astrophysics
Abstract

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. We aim at measuring the Lyman continuum escape fraction, which is one of the key parameters to compute the contribution of star-forming galaxies to the UV background. We have used ultra-deep U-band imaging (U=30.2mag at 1sigma) by LBC/LBT in the CANDELS/GOODS-North field, as well as deep imaging in COSMOS and EGS fields, in order to estimate the Lyman continuum escape fraction of 69 star-forming galaxies with secure spectroscopic redshifts at 3.27L*), while for the faint population (L=0.2L*) the limit to the escape fraction is ~10%. We have computed the contribution of star-forming galaxies to the observed UV background at z~3 and we have found that it is not enough to keep the Universe ionized at these redshifts, unless their escape fraction increases significantly (>10%) at low luminosities (M1500>-19). 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 to measure the Lyman continuum escape fraction down to faint magnitudes (M1500~-16) which are inaccessible with the present instrumentation on blank fields., We acknowledge the financial contribution from the agreement ASI-INAF I/009/10/0.

Published
2017
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2. The morphologies of massive galaxies at 1 < z < 3 in the CANDELS-UDS field : compact bulges, and the rise and fall of massive discs

Author

Bruce, VA, Dunlop, JS, Cirasuolo, M, McLure, RJ, Targett, TA, Bell, EF, Croton, DJ, Dekel, A, Faber, SM, Ferguson, HC, Grogin, NA, Kocevski, DD, Koekemoer, AM, Koo, DC, Lai, K, Lotz, JM, McGrath, EJ, Newman, JA, and van der Wel, Arjen

Subjects
SIMILAR-TO 2, SIZE EVOLUTION, Astrophysics::Cosmology and Extragalactic Astrophysics, HUBBLE-SPACE-TELESCOPE, cD, high-redshift, GALAXIES, spiral [galaxies], Physics and Astronomy, ELLIPTIC GALAXIES, PASSIVE, STAR-FORMING GALAXIES, structure [galaxies], DIGITAL SKY SURVEY, QUIESCENT GALAXIES, Astrophysics::Earth and Planetary Astrophysics, EXTRAGALACTIC LEGACY SURVEY, Astrophysics::Galaxy Astrophysics, elliptical and lenticular [galaxies], evolution [galaxies], [galaxies]
Abstract

We have used high-resolution, Hubble Space Telescope, near-infrared imaging to conduct a detailed analysis of the morphological properties of the most massive galaxies at high redshift, modelling the WFC3/IR H-160-band images of the similar or equal to 200 galaxies in the CANDELS-UDS field with photometric redshifts 1 < z < 3, and stellar masses M-* > 10(11)M(circle dot). We have explored the results of fitting single-Sersic and bulge+disc models, and have investigated the additional errors and potential biases introduced by uncertainties in the background and the on-image point spread function. This approach has enabled us to obtain formally acceptable model fits to the WFC3/IR images of > 90 per cent of the galaxies. Our results indicate that these massive galaxies at 1 < z < 3 lie both on and below the local size-mass relation, with a median effective radius of similar to 2.6 kpc, a factor of similar or equal to 2.3 smaller than comparably massive local galaxies. Moreover, we find that bulge-dominated objects in particular show evidence for a growing bimodality in the size-mass relation with increasing redshift, and by z > 2 the compact bulges display effective radii a factor of similar or equal to 4 smaller than local ellipticals of comparable mass. These trends also appear to extend to the bulge components of disc-dominated galaxies. In addition, we find that, while such massive galaxies at low redshift are generally bulge-dominated, at redshifts 1 < z < 2 they are predominantly mixed bulge+disc systems, and by z > 2 they are mostly disc-dominated. The majority of the disc-dominated galaxies are actively forming stars, although this is also true for many of the bulge-dominated systems. Interestingly, however, while most of the quiescent galaxies are bulge-dominated, we find that a significant fraction (25-40 per cent) of the most quiescent galaxies, with specific star formation rates sSFR < 10(-10) yr(-1), have disc-dominated morphologies. Thus, while our results show that the massive galaxy population is undergoing dramatic changes at this crucial epoch, they also suggest that the physical mechanisms which quench star formation activity are not simply connected to those responsible for the morphological transformation of massive galaxies into present-day giant ellipticals.

Published
2012

3. CEERS Key Paper V: A triality on the nature of HST-dark galaxies

Author

Pablo G. Pérez-González, Guillermo Barro, Marianna Annunziatella, Luca Costantin, Ángela García-Argumánez, Elizabeth J. McGrath, Rosa M. Mérida, Jorge A. Zavala, Pablo Arrabal Haro, Micaela B. Bagley, Bren E. Backhaus, Peter Behroozi, Eric F. Bell, Laura Bisigello, Véronique Buat, Antonello Calabrò, Caitlin M. Casey, Nikko J. Cleri, Rosemary T. Coogan, M. C. Cooper, Asantha R. Cooray, Avishai Dekel, Mark Dickinson, David Elbaz, Henry C. Ferguson, Steven L. Finkelstein, Adriano Fontana, Maximilien Franco, Jonathan P. Gardner, Mauro Giavalisco, Carlos Gómez-Guijarro, Andrea Grazian, Norman A. Grogin, Yuchen Guo, Marc Huertas-Company, Shardha Jogee, Jeyhan S. Kartaltepe, Lisa J. Kewley, Allison Kirkpatrick, Dale D. Kocevski, Anton M. Koekemoer, Arianna S. Long, Jennifer M. Lotz, Ray A. Lucas, Casey Papovich, Nor Pirzkal, Swara Ravindranath, Rachel S. Somerville, Sandro Tacchella, Jonathan R. Trump, Weichen Wang, Stephen M. Wilkins, Stijn Wuyts, Guang Yang, L. Y. Aaron Yung, Pérez-González, PG [0000-0003-4528-5639], Barro, G [0000-0001-6813-875X], Annunziatella, M [0000-0002-8053-8040], Costantin, L [0000-0001-6820-0015], García-Argumánez, Á [0000-0002-8365-5525], McGrath, EJ [0000-0001-8688-2443], Mérida, RM [0000-0001-8115-5845], Zavala, JA [0000-0002-7051-1100], Haro, PA [0000-0002-7959-8783], Bagley, MB [0000-0002-9921-9218], Backhaus, BE [0000-0001-8534-7502], Behroozi, P [0000-0002-2517-6446], Bell, EF [0000-0002-5564-9873], Bisigello, L [0000-0003-0492-4924], Buat, V [0000-0003-3441-903X], Calabrò, A [0000-0003-2536-1614], Casey, CM [0000-0002-0930-6466], Cleri, NJ [0000-0001-7151-009X], Coogan, RT [0000-0002-4343-0479], Cooper, MC [0000-0003-1371-6019], Cooray, AR [0000-0002-3892-0190], Dekel, A [0000-0003-4174-0374], Dickinson, M [0000-0001-5414-5131], Elbaz, D [0000-0002-7631-647X], Ferguson, HC [0000-0001-7113-2738], Finkelstein, SL [0000-0001-8519-1130], Fontana, A [0000-0003-3820-2823], Franco, M [0000-0002-3560-8599], Gardner, JP [0000-0003-2098-9568], Giavalisco, M [0000-0002-7831-8751], Gómez-Guijarro, C [0000-0002-4085-9165], Grazian, A [0000-0002-5688-0663], Grogin, NA [0000-0001-9440-8872], Guo, Y [0000-0002-4162-6523], Huertas-Company, M [0000-0002-1416-8483], Jogee, S [0000-0002-1590-0568], Kartaltepe, JS [0000-0001-9187-3605], Kewley, LJ [0000-0001-8152-3943], Kirkpatrick, A [0000-0002-1306-1545], Kocevski, DD [0000-0002-8360-3880], Koekemoer, AM [0000-0002-6610-2048], Long, AS [0000-0002-7530-8857], Lotz, JM [0000-0003-3130-5643], Lucas, RA [0000-0003-1581-7825], Papovich, C [0000-0001-7503-8482], Pirzkal, N [0000-0003-3382-5941], Ravindranath, S [0000-0002-5269-6527], Somerville, RS [0000-0002-6748-6821], Tacchella, S [0000-0002-8224-4505], Trump, JR [0000-0002-1410-0470], Wang, W [0000-0002-9593-8274], Wilkins, SM [0000-0003-3903-6935], Wuyts, S [0000-0003-3735-1931], Yang, G [0000-0001-8835-7722], Aaron Yung, LY [0000-0003-3466-035X], and Apollo - University of Cambridge Repository

Subjects
Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astronomy and Astrophysics, 5109 Space Sciences, 51 Physical Sciences, Astrophysics - Astrophysics of Galaxies
Abstract

The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate in unprecedented detail the nature of optical/near-IR faint, mid-IR bright sources, HST-dark galaxies among them. We gather JWST data from the CEERS survey in the EGS, jointly with HST data, and analyze spatially resolved optical-to-mid-IR spectral energy distributions (SEDs) to estimate both photometric redshifts in 2 dimensions and stellar populations properties in a pixel-by-pixel basis. We select 138 galaxies with F150W-F356W>1.5 mag, F356W100 Gyr^-1); (2) 18% are quiescent/dormant (i.e., subject to reignition and rejuvenation) galaxies at 3, Comment: Published in CEERS ApJL Focus Issue, ApJL 946, L16

Published
2022
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4. On the Stellar Populations of Galaxies at z=9-11: The Growth of Metals and Stellar Mass at Early Times

Author

Sandro Tacchella, Steven L. Finkelstein, Micaela Bagley, Mark Dickinson, Henry C. Ferguson, Mauro Giavalisco, Luca Graziani, Norman A. Grogin, Nimish Hathi, Taylor A. Hutchison, Intae Jung, Anton M. Koekemoer, Rebecca L. Larson, Casey Papovich, Norbert Pirzkal, Sofía Rojas-Ruiz, Mimi Song, Raffaella Schneider, Rachel S. Somerville, Stephen M. Wilkins, L. Y. Aaron Yung, Tacchella, S [0000-0002-8224-4505], Finkelstein, SL [0000-0001-8519-1130], Bagley, M [0000-0002-9921-9218], Dickinson, M [0000-0001-5414-5131], Ferguson, HC [0000-0001-7113-2738], Giavalisco, M [0000-0002-7831-8751], Graziani, L [0000-0002-9231-1505], Grogin, NA [0000-0001-9440-8872], Hathi, N [0000-0001-6145-5090], Hutchison, TA [0000-0001-6251-4988], Jung, I [0000-0003-1187-4240], Koekemoer, AM [0000-0002-6610-2048], Larson, RL [0000-0003-2366-8858], Papovich, C [0000-0001-7503-8482], Rojas-Ruiz, S [0000-0003-2349-9310], Song, M [0000-0002-8442-3128], Wilkins, SM [0000-0003-3903-6935], Yung, LYA [0000-0003-3466-035X], and Apollo - University of Cambridge Repository

Subjects
Early universe, Galaxy formation, Galaxy evolution, High-redshift galaxies, Star formation, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, 5101 Astronomical Sciences, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, 51 Physical Sciences, Astrophysics::Galaxy Astrophysics
Abstract

We present a detailed stellar population analysis of 11 bright ($H10$., Comment: 27 pages + Appendix; accepted by ApJ

Published
2021

5. A galaxy rapidly forming stars 700 million years after the Big Bang at redshift 7.51.

Author

Finkelstein SL, Papovich C, Dickinson M, Song M, Tilvi V, Koekemoer AM, Finkelstein KD, Mobasher B, Ferguson HC, Giavalisco M, Reddy N, Ashby ML, Dekel A, Fazio GG, Fontana A, Grogin NA, Huang JS, Kocevski D, Rafelski M, Weiner BJ, and Willner SP

Abstract

Of several dozen galaxies observed spectroscopically that are candidates for having a redshift (z) in excess of seven, only five have had their redshifts confirmed via Lyman α emission, at z = 7.008, 7.045, 7.109, 7.213 and 7.215 (refs 1-4). The small fraction of confirmed galaxies may indicate that the neutral fraction in the intergalactic medium rises quickly at z > 6.5, given that Lyman α is resonantly scattered by neutral gas. The small samples and limited depth of previous observations, however, makes these conclusions tentative. Here we report a deep near-infrared spectroscopic survey of 43 photometrically-selected galaxies with z > 6.5. We detect a near-infrared emission line from only a single galaxy, confirming that some process is making Lyman α difficult to detect. The detected emission line at a wavelength of 1.0343 micrometres is likely to be Lyman α emission, placing this galaxy at a redshift z = 7.51, an epoch 700 million years after the Big Bang. This galaxy's colours are consistent with significant metal content, implying that galaxies become enriched rapidly. We calculate a surprisingly high star-formation rate of about 330 solar masses per year, which is more than a factor of 100 greater than that seen in the Milky Way. Such a galaxy is unexpected in a survey of our size, suggesting that the early Universe may harbour a larger number of intense sites of star formation than expected.

Published
2013
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