56 research outputs found
Evolution of the UV LF from z~15 to z~8 Using New JWST NIRCam Medium-Band Observations over the HUDF/XDF
Here we present the first constraints on the prevalence of z>10 galaxies in
the Hubble Ultra Deep Field (HUDF) leveraging new NIRCam medium-band
observations taken with JWST. These NIRCam observations probe redward of
1.6microns, beyond the wavelength limit of HST, allowing us to search for
galaxies to z>10. These observations indicate that the highest redshift
candidate identified over the HUDF with HST, UDFj-39546284, has a redshift of
z=12.0+/-0.1, as had been suggested in multiple analyses of the HUDF12/XDF
data. This source thus appears to be the most distant galaxy discovered by HST
in its more than 30 years of operation. Additionally, we identify nine other
z~8-13 candidate galaxies over the HUDF, two of which are entirely new
discoveries and appear to lie at z~11 and z~12. We use these results to
characterize the evolution of the UV luminosity function (LF) from z~15 to
z~8.7. While our LF results at z~8.7 and z~10.5 are consistent with previous
findings over the HUDF, our new LF estimates at z~12.6 are substantially higher
than other results in the literature, potentially pointing to a milder
evolution in the UV luminosity density from z~12.6. We emphasize that our LF
results are uncertain given the small number of sources in our z~12.6 selection
and limited volume probed. The new NIRCam data also indicate that the faint
z~8-13 galaxies in the HUDF/XDF show very blue UV-continuum slopes beta~-2.7,
high specific star formation rates ~24.5 Gyr, and high EW (~1300A)
[OIII]+Hbeta emission, with two z~8.5 sources showing [OIII]+Hbeta EWs of ~2300
Angstroms.Comment: 19 pages, 14 figures, 7 tables, submitted to MNRAS, with some minor
typos correcte
Plutonium in the environment: key factors related to impact assessment in case of an accidental atmospheric release
International audienceThis paper deals with plutonium and key factors related to impact assessment. It is based on recent work performed by CEA which summarize the main features of plutonium behaviour from sources inside installations to the environment and man, and to report current knowledge on the different parameters used in models for environmental and radiological impact assessment. These key factors are illustrated through a case study based on an accidental atmospheric release of Pu in a nuclear facility
Lymphocytes Accelerate Epithelial Tight Junction Assembly: Role of AMP-Activated Protein Kinase (AMPK)
The tight junctions (TJs), characteristically located at the apicolateral borders of adjacent epithelial cells, are required for the proper formation of epithelial cell polarity as well as for sustaining the mucosal barrier to the external environment. The observation that lymphocytes are recruited by epithelial cells to the sites of infection [1] suggests that they may play a role in the modulation of epithelial barrier function and thus contribute to host defense. To test the ability of lymphocytes to modulate tight junction assembly in epithelial cells, we set up a lymphocyte-epithelial cell co-culture system, in which Madin-Darby canine kidney (MDCK) cells, a well-established model cell line for studying epithelial TJ assembly [2], were co-cultured with mouse lymphocytes to mimic an infection state. In a typical calcium switch experiment, the TJ assembly in co-culture was found to be accelerated compared to that in MDCK cells alone. This accelaration was found to be mediated by AMP-activated protein kinase (AMPK). AMPK activation was independent of changes in cellular ATP levels but it was found to be activated by the pro-inflammatory cytokine TNF-α. Forced suppression of AMPK, either with a chemical inhibitor or by knockdown, abrogated the accelerating effect of lymphocytes on TJ formation. Similar results were also observed in a co-culture with lymphocytes and Calu-3 human airway epithelial cells, suggesting that the activation of AMPK may be a general mechanism underlying lymphocyte-accelerated TJ assembly in different epithelia. These results suggest that signals from lymphocytes, such as cytokines, facilitate TJ assembly in epithelial cells via the activation of AMPK
Mapping dusty galaxy growth at with FRESCO: Detection of H in submm galaxy HDF850.1 and the surrounding overdense structures
We report the detection of a 13 H emission line from HDF850.1
at using the FRESCO NIRCam F444W grism observations.
Detection of H in HDF850.1 is noteworthy, given its high far-IR
luminosity, substantial dust obscuration, and the historical challenges in
deriving its redshift. HDF850.1 shows a clear detection in the F444W imaging
data, distributed between a northern and southern component, mirroring that
seen in [CII] from the Plateau de Bure Interferometer. Modeling the SED of each
component separately, we find that the northern component has a higher mass,
star formation rate (SFR), and dust extinction than the southern component. The
observed H emission appears to arise entirely from the less-obscured
southern component and shows a similar v+130 km/s velocity offset
to that seen for [CII] relative to the source systemic redshift. Leveraging
H-derived redshifts from FRESCO observations, we find that HDF850.1 is
forming in one of the richest environments identified to date at , with
100 galaxies distributed across 10 structures and a (15
cMpc) volume. Based on the evolution of analogous structures in
cosmological simulations, the structures seem likely to collapse
into a single 10 cluster by . Comparing galaxy
properties forming within this overdensity with those outside, we find the
masses, SFRs, and luminosities inside the overdensity to be clearly
higher. The prominence of H line emission from HDF850.1 and other known
highly-obscured galaxies illustrates the potential of NIRCam-grism
programs to map both the early build-up of IR-luminous galaxies and overdense
structures.Comment: Submitted to MNRAS. 20 pages, 10 figures and 8 tables (including
appendices
The JWST FRESCO Survey: Legacy NIRCam/Grism Spectroscopy and Imaging in the two GOODS Fields
We present the JWST Cycle 1 53.8hr medium program FRESCO, short for "First
Reionization Epoch Spectroscopically Complete Observations". FRESCO covers 62
arcmin in each of the two GOODS/CANDELS fields for a total area of 124
arcmin exploiting JWST's powerful new grism spectroscopic capabilities at
near-infrared wavelengths. By obtaining ~2 hr deep NIRCam/grism observations
with the F444W filter, FRESCO yields unprecedented spectra at R~1600 covering
3.8 to 5.0 m for most galaxies in the NIRCam field-of-view. This setup
enables emission line measurements over most of cosmic history, from strong PAH
lines at z~0.2-0.5, to Pa and Pa at z~1-3, HeI and [SIII] at
z~2.5-4.5, H and [NII] at z~5-6.5, up to [OIII] and H for z~7-9
galaxies, and possibly even [OII] at z~10-12. FRESCO's grism observations
provide total line fluxes for accurately estimating galaxy stellar masses and
calibrating slit-loss corrections of NIRSpec/MSA spectra in the same field.
Additionally, FRESCO results in a mosaic of F182M, F210M, and F444W imaging in
the same fields to a depth of ~28.2 mag (5 in 0.32" diameter
apertures). Together with this publication, the v1 imaging mosaics are released
as high-level science products via MAST. Here, we describe the overall survey
design and the key science goals that can be addressed with FRESCO. We also
highlight several, early science results, including: spectroscopic redshifts of
Lyman break galaxies that were identified almost 20 years ago, the discovery of
broad-line active galactic nuclei at z>4, and resolved Pa maps of
galaxies at z~1.4. These results demonstrate the enormous power for
serendipitous discovery of NIRCam/grism observations. Given the wealth of
ancillary data available in these fields, the zero-proprietary time FRESCO data
is poised to enable a large amount of legacy science by the community.Comment: 11 pages, 11 figures; submitted to MNRAS; for more information on the
survey and data releases, see http://jwst-fresco.astro.unige.ch
The JWST FRESCO Survey:Legacy NIRCam/Grism Spectroscopy and Imaging in the two GOODS Fields
We present the JWST cycle 1 53.8 h medium program FRESCO, short for 'First Reionization Epoch Spectroscopically Complete Observations'. FRESCO covers 62 arcmin2 in each of the two GOODS/CANDELS fields for a total area of 124 arcmin2 exploiting JWST's powerful new grism spectroscopic capabilities at near-infrared wavelengths. By obtaining ∼2 h deep NIRCam/grism observations with the F444W filter, FRESCO yields unprecedented spectra at R ∼1600 covering 3.8-5.0 μm for most galaxies in the NIRCam field of view. This setup enables emission line measurements over most of cosmic history, from strong PAH lines at z ∼0.2-0.5, to Pa α and Pa β at z ∼1-3, He i and [S iii] at z ∼2.5-4.5, H α and [N ii] at z ∼5-6.5, up to [O iii] and H β for z ∼7-9 galaxies. FRESCO's grism observations provide total line fluxes for accurately estimating galaxy stellar masses and calibrating slit-loss corrections of NIRSpec/MSA spectra in the same field. Additionally, FRESCO results in a mosaic of F182M, F210M, and F444W imaging in the same fields to a depth of ∼28.2 mag (5σ in 032 diameter apertures). Here, we describe the overall survey design and the key science goals that can be addressed with FRESCO. We also highlight several, early science results, including: spectroscopic redshifts of Lyman break galaxies that were identified almost 20 yr ago, the discovery of broad-line active galactic nuclei at z > 4, and resolved Pa α maps of galaxies at z ∼1.4. These results demonstrate the enormous power for serendipitous discovery of NIRCam/grism observations.</p
The JWST FRESCO Survey: Legacy NIRCam/Grism Spectroscopy and Imaging in the two GOODS Fields
We present the JWST Cycle 1 53.8hr medium program FRESCO, short for “First Reionization Epoch Spectroscopically Complete Observations”. FRESCO covers 62 arcmin2 in each of the two GOODS/CANDELS fields for a total area of 124 arcmin2 exploiting JWST’s powerful new grism spectroscopic capabilities at near-infrared wavelengths. By obtaining ∼2hr deep NIRCam/grism observations with the F444W filter, FRESCO yields unprecedented spectra at R ∼ 1600 covering 3.8 to 5.0 μm for most galaxies in the NIRCam field-of-view. This setup enables emission line measurements over most of cosmic history, from strong PAH lines at z ∼ 0.2 − 0.5, to Paα and Paβ at z ∼ 1 − 3, HeI and [SIII] at z ∼ 2.5 − 4.5, Hα and [NII] at z ∼ 5 − 6.5, up to [OIII] and Hβ for z∼7-9 galaxies. FRESCO’s grism observations provide total line fluxes for accurately estimating galaxy stellar masses and calibrating slit-loss corrections of NIRSpec/MSA spectra in the same field. Additionally, FRESCO results in a mosaic of F182M, F210M, and F444W imaging in the same fields to a depth of ∼28.2 mag (5 σ in 032 diameter apertures). Here, we describe the overall survey design and the key science goals that can be addressed with FRESCO. We also highlight several, early science results, including: spectroscopic redshifts of Lyman break galaxies that were identified almost 20 years ago, the discovery of broad-line active galactic nuclei at z &gt; 4, and resolved Paα maps of galaxies at z ∼ 1.4. These results demonstrate the enormous power for serendipitous discovery of NIRCam/grism observations
The JWST FRESCO survey: legacy NIRCam/grism spectroscopy and imaging in the two GOODS fields
We present the JWST cycle 1 53.8 h medium program FRESCO, short for 'First Reionization Epoch Spectroscopically Complete Observations'. FRESCO covers 62 arcmin2 in each of the two GOODS/CANDELS fields for a total area of 124 arcmin2 exploiting JWST's powerful new grism spectroscopic capabilities at near-infrared wavelengths. By obtaining ∼2 h deep NIRCam/grism observations with the F444W filter, FRESCO yields unprecedented spectra at R ∼1600 covering 3.8-5.0 μm for most galaxies in the NIRCam field of view. This setup enables emission line measurements over most of cosmic history, from strong PAH lines at z ∼0.2-0.5, to Pa α and Pa β at z ∼1-3, He i and [S iii] at z ∼2.5-4.5, H α and [N ii] at z ∼5-6.5, up to [O iii] and H β for z ∼7-9 galaxies. FRESCO's grism observations provide total line fluxes for accurately estimating galaxy stellar masses and calibrating slit-loss corrections of NIRSpec/MSA spectra in the same field. Additionally, FRESCO results in a mosaic of F182M, F210M, and F444W imaging in the same fields to a depth of ∼28.2 mag (5σ in 032 diameter apertures). Here, we describe the overall survey design and the key science goals that can be addressed with FRESCO. We also highlight several, early science results, including: spectroscopic redshifts of Lyman break galaxies that were identified almost 20 yr ago, the discovery of broad-line active galactic nuclei at z > 4, and resolved Pa α maps of galaxies at z ∼1.4. These results demonstrate the enormous power for serendipitous discovery of NIRCam/grism observations
- …