We report the discovery of a remarkable Ly\(\alpha\) emitting galaxy at z = 7.2782, JADES-GS-z7-LA, with EW\(_0\)(Ly\(\alpha\)) \(= 388.0 \pm 88.8\)\AA and UV magnitude -17.0. The spectroscopic ...redshift is confirmed via rest-frame optical lines O II, H\(\beta\) and O III in its JWST/NIRSpec Micro-Shutter Assembly (MSA) spectrum. The Ly\(\alpha\) line is detected in both lower resolution PRISM as well as medium resolution G140M grating spectra. The LSF-deconvolved Ly\(\alpha\) FWHM in the grating is \(383.9 \pm 56.2\) km/s and the Ly\(\alpha\) velocity offset compared to the systemic redshift is \(113.3 \pm 80.0\) km/s, indicative of very little neutral gas or dust within the galaxy. We estimate the Ly\(\alpha\) escape fraction to be >70%. JADES-GS-z7-LA has a O32 ratio of \(11.1 \pm 2.2\) and a R23 ratio of \(11.2 \pm 2.6\), consistent with low metallicity and high ionization parameters. Deep NIRCam imaging also revealed a close companion source (separated by 0.23"), which exhibits similar photometry to that of JADES-GS-z7-LA, with a photometric excess in the F410M NIRCam image consistent with O III+H\(\beta\) emission at the same redshift. The spectral energy distribution of JADES-GS-z7-LA indicates a "bursty" star formation history, with a low stellar mass of \(\approx 10^7\) \(M_\odot\). Assuming that the Ly\(\alpha\) transmission through the intergalactic medium is the same as its measured escape fraction, an ionized region of size > 1.5 pMpc is needed to explain the high Ly\(\alpha\) EW and low velocity offset compared to systemic seen in JADES-GS-z7-LA. Owing to its UV-faintness, we show that it is incapable of single-handedly ionizing a region large enough to explain its Ly\(\alpha\) emission. Therefore, we suggest that JADES-GS-z7-LA (and possibly the companion source) may be a part of a larger overdensity, presenting direct evidence of overlapping ionized bubbles at \(z>7\).
JWST has revolutionized the field of extragalactic astronomy with its sensitive and high-resolution infrared view of the distant universe. Adding to the new legacy of JWST observations, we present ...the first NIRCam imaging data release from the JWST Advanced Deep Extragalactic Survey (JADES) providing 9 filters of infrared imaging of \(\sim\)25 arcmin\(^2\) covering the Hubble Ultra Deep Field and portions of Great Observatories Origins Deep Survey (GOODS) South. Utilizing 87 on-sky dual-filter hours of exposure time, these images reveal the deepest ever near-infrared view of this iconic field. We supply carefully constructed 9-band mosaics of the JADES bands, as well as matching reductions of 5 additional bands from the JWST Extragalactic Medium-band Survey (JEMS). Combining with existing HST imaging, we provide 23-band space-based photometric catalogs and photometric redshifts for \(\approx47,500\) sources. To promote broad engagement with the JADES survey, we have created an interactive {\tt FitsMap} website to provide an interface for professional researchers and the public to experience these JWST datasets. Combined with the first JADES NIRSpec data release, these public JADES imaging and spectroscopic datasets provide a new foundation for discoveries of the infrared universe by the worldwide scientific community.
We report the discovery of a triply imaged active galactic nucleus (AGN),
lensed by the galaxy cluster MACS J0035.4-2015 ($z_{\mathrm{d}}=0.352$). The
object is detected in Hubble Space Telescope ...imaging taken for the RELICS
program. It appears to have a quasi-stellar nucleus consistent with a
point-source, with a de-magnified radius of $r_e\lesssim100$ pc. The object is
spectroscopically confirmed to be an AGN at $z_{\mathrm{spec}}=2.063\pm0.005$
showing broad rest-frame UV emission lines, and is detected in both X-ray
observations with Chandra and in ALCS ALMA band 6 (1.2 mm) imaging. It has a
relatively faint rest-frame UV luminosity for a quasar-like object,
$M_{\mathrm{UV},1450}=-19.7\pm0.2$. The object adds to just a few quasars or
other X-ray sources known to be multiply lensed by a galaxy cluster. Some
diffuse emission from the host galaxy is faintly seen around the nucleus and
there is a faint object nearby sharing the same multiple-imaging symmetry and
geometric redshift, possibly an interacting galaxy or a star-forming knot in
the host. We present an accompanying lens model, calculate the magnifications
and time delays, and infer physical properties for the source. We find the
rest-frame UV continuum and emission lines to be dominated by the AGN, and the
optical emission to be dominated by the host galaxy of modest stellar mass
$M_{\star}\simeq10^{9.2} \mathrm{M}_{\odot}$. We also observe some variation in
the AGN emission with time, which may suggest that the AGN used to be more
active. This object adds a low-redshift counterpart to several relatively faint
AGN recently uncovered at high redshifts with HST and JWST.
We present JEMS (JWST Extragalactic Medium-band Survey), the first public medium-band imaging survey carried out using JWST/NIRCam and NIRISS. These observations use \(\sim2\mu\)m and \(\sim4\mu\)m ...medium-band filters (NIRCam F182M, F210M, F430M, F460M, F480M; and NIRISS F430M & F480M in parallel) over 15.6 square arcminutes in the Hubble Ultra Deep Field (UDF), thereby building on the deepest multi-wavelength public datasets available anywhere on the sky. We describe our science goals, survey design, NIRCam and NIRISS image reduction methods, and describe our first data release of the science-ready mosaics. Our chosen filters create a JWST imaging survey in the UDF that enables novel analysis of a range of spectral features potentially across the redshift range of \(0.3<z<20\), including Paschen-\(\alpha\), H\(\alpha\)+NII, and OIII+H\(\beta\) emission at high spatial resolution. We find that our JWST medium-band imaging efficiently identifies strong line emitters (medium-band colors \(>1\) magnitude) across redshifts \(1.5<z<9.3\), most prominently H\(\alpha\)+NII and OIII+H\(\beta\). We present our first data release including science-ready mosaics of each medium-band image available to the community, adding to the legacy value of past and future surveys in the UDF. We also describe future data releases. This survey demonstrates the power of medium-band imaging with JWST, informing future extragalactic survey strategies using JWST observations.
We present JWST NIRCam 9-band near-infrared imaging of the luminous \(z=10.6\) galaxy GN-z11 from the JWST Advanced Deep Extragalactic Survey (JADES) of the GOODS-N field. We find a spectral energy ...distribution (SED) entirely consistent with the expected form of a high-redshift galaxy: a clear blue continuum from 1.5 to 4 microns with a complete dropout in F115W. The core of GN-z11 is extremely compact in JWST imaging. We analyze the image with a two-component model, using a point source and a S\'{e}rsic profile that fits to a half-light radius of 200 pc and an index \(n=0.9\). We find a low-surface brightness haze about \(0.4''\) to the northeast of the galaxy, which is most likely a foreground object but might be a more extended component of GN-z11. At a spectroscopic redshift of 10.60 (Bunker et al. 2023), the comparison of the NIRCam F410M and F444W images spans the Balmer jump. From population synthesis modeling, here assuming no light from an active galactic nucleus, we reproduce the SED of GN-z11, finding a stellar mass of $\sim$$10^{9}~M_{\odot}\(, a star-formation rate of \)\sim$$20~M_{\odot}~\mathrm{yr}^{-1}\( and a young stellar age of \)\sim$$20~\mathrm{Myr}\(. As massive galaxies at high redshift are likely to be highly clustered, we search for faint neighbors of GN-z11, finding 9 galaxies out to \)\sim\(5 comoving Mpc transverse with photometric redshifts consistent with \)z=10.6\(, and a 10\)^{\rm th}\( more tentative dropout only \)3''\( away. This is consistent with GN-z11 being hosted by a massive dark-matter halo (\)\approx8\times10^{10}~M_{\odot}$), though lower halo masses cannot be ruled out.
We describe the NIRSpec component of the JWST Deep Extragalactic Survey (JADES), and provide deep spectroscopy of 253 sources targeted with the NIRSpec micro-shutter assembly in the Hubble Ultra Deep ...Field and surrounding GOODS-South. The multi-object spectra presented here are the deepest so far obtained with JWST, amounting to up to 28 hours in the low-dispersion (\(R\sim 30-300\)) prism, and up to 7 hours in each of the three medium-resolution \(R\approx 1000\) gratings and one high-dispersion grating, G395H (\(R\approx2700\)). Our low-dispersion and medium-dispersion spectra cover the wavelength range \(0.6-5.3\mu\)m. We describe the selection of the spectroscopic targets, the strategy for the allocation of targets to micro-shutters, and the design of the observations. We present the public release of the reduced 2D and 1D spectra, and a description of the reduction and calibration process. We measure spectroscopic redshifts for 178 of the objects targeted extending up to \(z=13.2\). We present a catalog of all emission lines detected at \(S/N>5\), and our redshift determinations for the targets. Combined with the first JADES NIRCam data release, these public JADES spectroscopic and imaging datasets provide a new foundation for discoveries of the infrared universe by the worldwide scientific community.
We present an overview of the James Webb Space Telescope (JWST) Advanced Deep Extragalactic Survey (JADES), an ambitious program of infrared imaging and spectroscopy in the GOODS-S and GOODS-N deep ...fields, designed to study galaxy evolution from high redshift to cosmic noon. JADES uses about 770 hours of Cycle 1 guaranteed time largely from the Near-Infrared Camera (NIRCam) and Near-Infrared Spectrograph (NIRSpec) instrument teams. In GOODS-S, in and around the Hubble Ultra Deep Field and Chandra Deep Field South, JADES produces a deep imaging region of ~45 arcmin\(^2\) with an average of 130 hrs of exposure time spread over 9 NIRCam filters. This is extended at medium depth in GOODS-S and GOODS-N with NIRCam imaging of ~175 arcmin\(^2\) with an average exposure time of 20 hrs spread over 8-10 filters. In both fields, we conduct extensive NIRSpec multi-object spectroscopy, including 2 deep pointings of 55 hrs exposure time, 14 medium pointings of ~12 hrs, and 15 shallower pointings of ~4 hrs, targeting over 5000 HST and JWST-detected faint sources with 5 low, medium, and high-resolution dispersers covering 0.6-5.3 microns. Finally, JADES extends redward via coordinated parallels with the JWST Mid-Infrared Instrument (MIRI), featuring ~9 arcmin\(^2\) with 43 hours of exposure at 7.7 microns and twice that area with 2-6.5 hours of exposure at 12.8 microns For nearly 30 years, the GOODS-S and GOODS-N fields have been developed as the premier deep fields on the sky; JADES is now providing a compelling start on the JWST legacy in these fields.
Finding and characterising the first galaxies that illuminated the early Universe at cosmic dawn is pivotal to understand the physical conditions and the processes that led to the formation of the ...first stars. In the first few months of operations, imaging from the James Webb Space Telescope (JWST) have been used to identify tens of candidates of galaxies at redshift (z) greater than 10, less than 450 million years after the Big Bang. However, none of these candidates has yet been confirmed spectroscopically, leaving open the possibility that they are actually low-redshift interlopers. Here we present spectroscopic confirmation and analysis of four galaxies unambiguously detected at redshift 10.3<z<13.2, previously selected from NIRCam imaging. The spectra reveal that these primeval galaxies are extremely metal poor, have masses between 10^7 and a few times 10^8 solar masses, and young ages. The damping wings that shape the continuum close to the Lyman edge are consistent with a fully neutral intergalactic medium at this epoch. These findings demonstrate the rapid emergence of the first generations of galaxies at cosmic dawn.
A&A 677, A88 (2023) We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous
candidate $z>10$ Lyman break galaxy in the GOODS-North field with
$M_{UV}=-21.5$. We derive a redshift of ...$z=10.603$ (lower than previous
determinations) based on multiple emission lines in our low and medium
resolution spectra over $0.8-5.3 \mu$m. We significantly detect the continuum
and measure a blue rest-UV spectral slope of $\beta=-2.4$. Remarkably, we see
spatially-extended Lyman-$\alpha$ in emission (despite the highly-neutral IGM
expected at this early epoch), offset 555 km s$^{-1}$ redward of the systemic
redshift. From our measurements of collisionally-excited lines of both low- and
high-ionization (including O II$\lambda3727$, Ne III$\lambda 3869$ and C
III$\lambda1909$) we infer a high ionization parameter ($\log U\sim -2$). We
detect the rarely-seen N IV$\lambda1486$ and N III$\lambda1748$ lines in both
our low and medium resolution spectra, with other high ionization lines seen in
the low resolution spectrum such as He II (blended with O III) and C IV (with
a possible P-Cygni profile). Based on the observed rest-UV line ratios, we
cannot conclusively rule out photoionization from AGN, although the high C
III/He II and N III/He II ratios are compatible with a star-formation
explanation. If the observed emission lines are powered by star formation, then
the strong N III$\lambda1748$ observed may imply an unusually high $N/O$
abundance. Balmer emission lines (H$\gamma$, H$\delta$) are also detected, and
if powered by star formation rather than an AGN we infer a star formation rate
of $\sim 20-30 M_{\odot} yr^{-1}$ (depending on the IMF) and low dust
attenuation. Our NIRSpec spectroscopy confirms that GN-z11 is a remarkable
galaxy with extreme properties seen 430 Myr after the Big Bang.
Series Blurb Oxford Readings in Feminism provide accessible, one-volume guides to the very best in contemporary feminist thinking, assessing its impact and importance in key areas of study. Collected ...together by scholars of outstanding reputation in their field, the articles chosen represent the most important work on feminist issues, and concise, lively introductions to each volume crystallize the main line of debate in the field. The categories of public and private have been at the centre of feminist theory for the past three decades. Focusing on the gendered relations of sexuality and the body, family life and democratic citizenship, feminists have redirected public debate on questions of privacy and publicity. They have challenged leading theories of the public sphere, adding immeasurably to the historical and cross-cultural understanding of public and private life, from the rise of liberal and democratic institutions in the eighteenth and nineteenth centuries to today's media-saturated public sphere. This volume presents the results of this multi-disciplinary feminist exploration. Contributors demonstrate the significance of the public/private distinction in feminist theory, its articulation in the modern and late modern public sphere, and its impact on identity politics within feminism in recent years. Feminism, the Public and the Private offers an essential perspective on feminist theory for students and teachers of women's and gender studies, cultural studies, history, political theory, geography and sociology.
