Examinando por Autor "Williams, Christina C."

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Acceso Abierto
JADES Data Release 3: NIRSpec/Microshutter Assembly Spectroscopy for 4000 Galaxies in the GOODS Fields
(American Astronomical Society, 2025-02-14) D'Eugenio, Francesco; Cameron, Alex J.; Scholtz, Jan; Carniani, Stefano; Willott, Chris J.; Curtis-Lake, Emma; Bunker, Andrew J.; Parlanti, Eleonora; Maiolino, Roberto; Willmer, Christopher N. A.; Jakobsen, Peter; Robertson, Brant; Johnson, Benjamin D.; Tacchella, Sandro; Cargile, Phillip; Rawle, T. D.; Arribas, Santiago; Chevallard, Jacopo; Curti, Mirko; Egami, E.; Eisenstein, Daniel; Kumari, Nimisha; Looser, Tobias J.; Rieke, Marcia; Rodriguez Del Pino, Bruno; Saxena, Aayush; Übler, Hannah; Venturi, Giacomo; Witstok, Joris; Baker, William M.; Bhatawdekar, Rachana; Bonaventura, Nina; Boyett, Kristan; Charlot, Stephane; Danhaive, Angelica Lola; Hainline, Kevin N.; Hausen, Ryan; Helton, Jakob M.; Ji, Xihan; Ji, Zhiyuan; Jones, Gareth C.; Juodžbalis, Ignas; Maseda, Michael; Pérez-González, Pablo G.; Perna, Michele; Puskás, Dávid; Shivaei, Irene; Silcock, Maddie; Simmonds, Charlotte; Smit, Renske; Sun, Fengwu; Villanueva, Natalia C.; Williams, Christina C.; Zhu, Yongda; Science and Technology Facilities Council (STFC); European Research Council (ERC); Agencia Estatal de Investigación (AEI); Comunidad de Madrid; University of Arizona (UA); Danish National Research Foundation (DNRF); Australian Research Council (ARC)
We present the third data release of the JWST Advanced Deep Extragalactic Survey (JADES), providing both imaging and spectroscopy in the two GOODS fields. Spectroscopy consists of medium-depth and deep NIRSpec/microshutter assembly spectra of 4000 targets, covering the spectral range 0.6-5.3 μm and observed with both the low-dispersion prism (R = 30-300) and all three medium-resolution gratings (R = 500-1500). We describe the observations, data reduction, sample selection, and target allocation. We measured 2375 redshifts (2053 from multiple emission lines); our targets span the range from z = 0.5 up to z = 13, including 404 at z > 5. The data release includes 2D and 1D fully reduced spectra, with slit-loss corrections and background subtraction optimized for point sources. We also provide redshifts and signal-to-noise ratio > 5 emission-line flux catalogs for the prism and grating spectra, and concise guidelines on how to use these data products. Alongside spectroscopy, we are also publishing fully calibrated NIRCam imaging, which enables studying the JADES sample with the combined power of imaging and spectroscopy. Together, these data provide the largest statistical sample to date to characterize the properties of galaxy populations in the first billion years after the Big Bang.
Acceso Abierto
Simulating JWST deep extragalactic imaging surveys and physical parameter recovery.
(EDP Sciences, 2020-08-13) Kauffmann, O. B.; Le Fèvre, O.; Ilbert, O.; Chevallard, Jacopo; Williams, Christina C.; Curtis-Lake, Emma; Colina, L. ; Pérez González, Pablo G.; Pye, J. P.; Caputi, K. I.; National Science Foundation (NSF); European Research Council (ERC); Agencia Estatal de Investigación (AEI); Ilbert, O. [https://orcid.org/0000-0002-7303-4397]; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
We present a new prospective analysis of deep multi-band imaging with the James Webb Space Telescope (JWST). In this work, we investigate the recovery of high-redshift 5 < z < 12 galaxies through extensive image simulations of accepted JWST programs, including the Early Release Science in the EGS field and the Guaranteed Time Observations in the HUDF. We introduced complete samples of ∼300 000 galaxies with stellar masses of log(M*/M⊙) > 6 and redshifts of 0 < z < 15, as well as galactic stars, into realistic mock NIRCam, MIRI, and HST images to properly describe the impact of source blending. We extracted the photometry of the detected sources, as in real images, and estimated the physical properties of galaxies through spectral energy distribution fitting. We find that the photometric redshifts are primarily limited by the availability of blue-band and near-infrared medium-band imaging. The stellar masses and star formation rates are recovered within 0.25 and 0.3 dex, respectively, for galaxies with accurate photometric redshifts. Brown dwarfs contaminating the z > 5 galaxy samples can be reduced to < 0.01 arcmin−2 with a limited impact on galaxy completeness. We investigate multiple high-redshift galaxy selection techniques and find that the best compromise between completeness and purity at 5 < z < 10 using the full redshift posterior probability distributions. In the EGS field, the galaxy completeness remains higher than 50% at magnitudes mUV < 27.5 and at all redshifts, and the purity is maintained above 80 and 60% at z ≤ 7 and 10, respectively. The faint-end slope of the galaxy UV luminosity function is recovered with a precision of 0.1–0.25, and the cosmic star formation rate density within 0.1 dex. We argue in favor of additional observing programs covering larger areas to better constrain the bright end.