CEERS: Diversity of Lyman-Alpha Emitters during the Epoch of Reionization

We analyze rest-frame ultraviolet to optical spectra of three $z\simeq7.47$ - $7.75$ galaxies whose Ly$\alpha$-emission lines were previously detected with Keck/MOSFIRE observations, using the JWST/NIRSpec observations from the Cosmic Evolution Early Release Science (CEERS) survey. From NIRSpec data, we confirm the systemic redshifts of these Ly$\alpha$ emitters, and emission-line ratio diagnostics indicate these galaxies were highly ionized and metal poor. We investigate Ly$\alpha$ line properties, including the line flux, velocity offset, and spatial extension. For the one galaxy where we have both NIRSpec and MOSFIRE measurements, we find a significant offset in their flux measurements ($\sim5\times$ greater in MOSFIRE) and a marginal difference in the velocity shifts. The simplest interpretation is that the Ly$\alpha$ emission is extended and not entirely encompassed by the NIRSpec slit. The cross-dispersion profiles in NIRSpec reveal that Ly$\alpha$ in one galaxy is significantly more extended than the non-resonant emission lines. We also compute the expected sizes of ionized bubbles that can be generated by the Ly$\alpha$ sources, discussing viable scenarios for the creation of sizable ionized bubbles ($>$1 physical Mpc). The source with the highest-ionization condition is possibly capable of ionizing its own bubble, while the other two do not appear to be capable of ionizing such a large region, requiring additional sources of ionizing photons. Therefore, the fact that we detect Ly$\alpha$ from these galaxies suggests diverse scenarios on escape of Ly$\alpha$ during the epoch of reionization. High spectral resolution spectra with JWST/NIRSpec will be extremely useful for constraining the physics of patchy reionization.Comment: Submitted to ApJ (18 pages, 7 figures, 2 tables

Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at z=4z=4 to 88 from CEERS

We analyze the evolution of massive (log$_{10}$ [$M_\star/M_\odot$] $>10$) galaxies at $z \sim$ 4--8 selected from the JWST Cosmic Evolution Early Release Science (CEERS) survey. We infer the physical properties of all galaxies in the CEERS NIRCam imaging through spectral energy distribution (SED) fitting with dense basis to select a sample of high redshift massive galaxies. Where available we include constraints from additional CEERS observing modes, including 18 sources with MIRI photometric coverage, and 28 sources with spectroscopic confirmations from NIRSpec or NIRCam wide-field slitless spectroscopy. We sample the recovered posteriors in stellar mass from SED fitting to infer the volume densities of massive galaxies across cosmic time, taking into consideration the potential for sample contamination by active galactic nuclei (AGN). We find that the evolving abundance of massive galaxies tracks expectations based on a constant baryon conversion efficiency in dark matter halos for $z \sim$ 1--4. At higher redshifts, we observe an excess abundance of massive galaxies relative to this simple model. These higher abundances can be explained by modest changes to star formation physics and/or the efficiencies with which star formation occurs in massive dark matter halos, and are not in tension with modern cosmology.Comment: 20 pages, 10 figure

CEERS Spectroscopic Confirmation of NIRCam-Selected z > 8 Galaxy Candidates with JWST/NIRSpec: Initial Characterization of their Properties

We present JWST NIRSpec spectroscopy for 11 galaxy candidates with photometric redshifts of $z\simeq9-13$ and $M_{\rm\,UV} \in[-21,-18]$ newly identified in NIRCam images in the Cosmic Evolution Early Release Science (CEERS) Survey. We confirm emission line redshifts for 7 galaxies at $z=7.762-8.998$ using spectra at $\sim1-5\mu$m either with the NIRSpec prism or its three medium resolution gratings. For $z\simeq9$ photometric candidates, we achieve a high confirmation rate of $\simeq$90\%, which validates the classical dropout selection from NIRCam photometry. No robust emission lines are identified in three galaxy candidates at $z>10$, where the strong [OIII] and H$\beta$ lines would be redshifted beyond the wavelength range observed by NIRSpec, and the Lyman-$\alpha$ continuum break is not detected with the current sensitivity. Compared with HST-selected bright galaxies ($M_{\rm\,UV}\simeq-22$) that are similarly spectroscopically confirmed at $z\gtrsim8$, these NIRCam-selected galaxies are characterized by lower star formation rates (SFR$\simeq4\,M_{\odot}$~yr$^{-1}$) and lower stellar masses ($\simeq10^{8}\,M_{\odot}$), but with higher [OIII]+H$\beta$ equivalent widths ($\simeq$1100$\r{A}$), and elevated production efficiency of ionizing photons ($\log(\xi_{\rm\,ion}/{\rm\,Hz\,erg}^{-1})\simeq25.8$) induced by young stellar populations ($<10$~Myrs) accounting for $\simeq20\%$ of the galaxy mass, highlighting the key contribution of faint galaxies to cosmic reionization. Taking advantage of the homogeneous selection and sensitivity, we also investigate metallicity and ISM conditions with empirical calibrations using the [OIII]/H$\beta$ ratio. We find that galaxies at $z\sim8-9$ have higher SFRs and lower metallicities than galaxies at similar stellar masses at $z\sim2-6$, which is generally consistent with the current galaxy formation and evolution models.Comment: 21 pages, 11 figures, 2 tables. Submitted to ApJL Focus Issu

Spectroscopic confirmation of CEERS NIRCam-selected galaxies at z≃8−10\boldsymbol{z \simeq 8-10}

We present JWST/NIRSpec prism spectroscopy of seven galaxies selected from the Cosmic Evolution Early Release Science Survey (CEERS) NIRCam imaging with photometric redshifts z_phot>8. We measure emission line redshifts of z=7.65 and 8.64 for two galaxies, and z=9.77(+0.37,-0.29) and 10.01(+0.14,-0.19) for two others via the detection of continuum breaks consistent with Lyman-alpha opacity from a mostly neutral intergalactic medium. The presence (absense) of strong breaks (strong emission lines) give high confidence that these two galaxies are at z>9.6, but the break-derived redshifts have large uncertainties given the low spectral resolution and relatively low signal-to-noise of the CEERS NIRSpec prism data. The two z~10 sources are relatively luminous (M_UV<-20), with blue continua (-2.3<beta<-1.9) and low dust attenuation (A_V=0.15(+0.3,-0.1)); and at least one of them has high stellar mass for a galaxy at that redshift (log(M_*/M_sol)=9.3(+0.2,-0.3)). Considered together with spectroscopic observations of other CEERS NIRCam-selected high-z galaxy candidates in the literature, we find a high rate of redshift confirmation and low rate of confirmed interlopers (8.3%). Ten out of 34 z>8 candidates with CEERS NIRSpec spectroscopy do not have secure redshifts, but the absence of emission lines in their spectra is consistent with redshifts z>9.6. We find that z>8 photometric redshifts are generally in agreement (within uncertainties) with the spectroscopic values. However, the photometric redshifts tend to be slightly overestimated (average Delta(z)=0.50+/-0.12), suggesting that current templates do not fully describe the spectra of very high-z sources. Overall, our results solidifies photometric evidence for a high space density of bright galaxies at z>8 compared to theoretical model predictions, and further disfavors an accelerated decline in the integrated UV luminosity density at z>8.Comment: Submitted to ApJL. 24 pages, 9 figures, 7 tables. File with Table 6 included in source .tar fil

The Science Performance of JWST as Characterized in Commissioning

This paper characterizes the actual science performance of the James Webb Space Telescope (JWST), as determined from the six month commissioning period. We summarize the performance of the spacecraft, telescope, science instruments, and ground system, with an emphasis on differences from pre-launch expectations. Commissioning has made clear that JWST is fully capable of achieving the discoveries for which it was built. Moreover, almost across the board, the science performance of JWST is better than expected; in most cases, JWST will go deeper faster than expected. The telescope and instrument suite have demonstrated the sensitivity, stability, image quality, and spectral range that are necessary to transform our understanding of the cosmos through observations spanning from near-earth asteroids to the most distant galaxies.Comment: 5th version as accepted to PASP; 31 pages, 18 figures; https://iopscience.iop.org/article/10.1088/1538-3873/acb29

The Impact of COVID-19 Household Isolation on Conflict and Cohesion in One-, Two-, and Three-Generation Households With Older Adults

The current cross-sectional study examined the effect of coronavirus disease 2019 (COVID-19) household isolation on household conflict and cohesion in one-, two-, and three-generation households with older adults (aged ≥65 years). Participants were 757 adults (aged ≥18 years) with at least one older adult in their household. Respondents were from 51 countries. Study variables were measured with the COVID-19 Household Environmental Scale. Non-parametric tests were used to assess differences between groups. Most participants (= 437, 57.7%) lived in three-generation homes. Three-generation homes reported greater increases in conflict (< 0.001) and cohesion (< 0.001) during household isolation compared to oneand two-generation homes. Findings suggest that older adults living in multigenerational households experienced more cohesive and conflictive household environments as a function of the COVID-19 pandemic. Further research should explore how family or health care interventions could better support older adults and families as a unit of care to avoid adverse outcomes and boost resilience. [(4), 47-56.]

Family Functioning in an International Sample of Households Reporting Adult Caregiving During the COVID-19 Pandemic

Public Significance Statement Households with adults requiring caregiving have experienced greater disruption to family functioning than noncaregiving households during the COVID-19 pandemic. The intersection of pandemic and caregiving stress may impart psychological and health risks for caregivers likely to be felt for years to come. Introduction: The COVID-19 pandemic has dramatically altered the functioning of households. Because of the vulnerability of high-risk groups, such as older adults and people with compromised immune systems, households caring for these vulnerable adults may be facing elevated levels of caregiving-related stress and burden. The current study sought to examine the impact of the pandemic on conflict and cohesion in households with adults requiring caregiving versus noncaregiving households. Methods: Respondent demographic, household level, and family functioning data were collected anonymously from an international sample (N = 4,241). Responses were examined using descriptive and bivariate analyses. Results: Overall, respondents in caregiving households (n = 667) reported a significantly greater negative impact of social distancing on their family functioning, with greater increase in conflict than nonadult caregiving households (n = 3,574). Significantly more caregiving households also reported that someone had stopped working due to the pandemic. No differences were observed for cohesion between the two groups, with both reporting a little bit more cohesion when compared with the period before social distancing. Conclusions: Our findings add to a body of literature demonstrating that caregiving families experience greater disruption and strain during disaster situations such as the COVID-19 pandemic. Future research is needed to establish the causality of the collected proximal factors, such as job loss and education, with pandemic related family functioning among homes caring for adults, and examining the impact of contextual factors, such as level of caregiving need and caregiving support

Assessing the impact of COVID-19 social distancing and social vulnerability on family functioning in an international sample of households with and without children

The COVID-19 pandemic is a worldwide event that has exacerbated stress and caused significant disruptions in the day-to-day living of families. Of particular concern are socially vulnerable families, which have felt the impacts of the pandemic most acutely. Because stress can alter family dynamics, it is important to understand which stressors impact families the most, and what resources can be leveraged to strengthen family functioning. The current study examined the impacts of COVID-19 on the conflict and cohesion of households with children compared to households without children. Additionally, we sought to assess how conflict and cohesion are related to social vulnerabilities in the context of the pandemic. Using an international sample, we analyzed responses to the COVID-19 Household Environment Scale (N = 4122) using descriptive and bivariate analyses. Latent class analysis was used to identify patterns of family functioning in households with and without children. We found that social vulnerability was associated with more disrupted family functioning, and that households with children (n = 2666) reported less disrupted family functioning when compared to households without children (n = 1456), despite having higher social vulnerability scores. Our exploratory latent class analysis identified a 5-class model among both subgroups. Conflict, cohesion, family functioning and social vulnerability varied significantly by subgroup and class membership. Our findings add to a body of evidence that argues that despite facing greater vulnerability, households with children have many strengths to draw from. Family interventions that help to promote family cohesion and conflict resolution can foster resilience in stressful circumstances

Abstract 15534: Pericardial Effusion in People With HIV in the Era of Antiretroviral Therapy

Byline: Karla Inestroza, Univ of Miami/ Jackson Memorial Hosp, Miami, FL; Vanessa Hurtado, Univ of Miami, Miami, FL; Michaela Larson; Ryan Severdija, miami, FL; Sanjana Satish, Miami, FL; Maria L Alcaide, Univ of Miami, miami, FL; Barry E Hurwitz, UNIVERSITY OF MIAMI, Miami, FL; Catherine Boulanger, Univ of Miami, Miami, FL; Dushyantha Jayaweera, UNIVERSITY OF MIAMI, MIAMI, FL; Alexis Powell, Univ of Miami, Miami, FL; Claudia Martinez, university of Miami, Miami Beach, FL Introduction: Pericardial effusion was previously described as one of the most common forms of cardiovascular involvement in People with HIV (PWH). The presence of pericardial effusion was considered a marker of advanced HIV infection and associated with a low CD4 cell count. This study describes the incidence and association of pericardial disease with HIV-related factors in an era of wider availability of antiretroviral therapy (ART). Methods: A retrospective chart review was performed of patients who received HIV care at the University of Miami/Jackson Memorial Hospital between 2017-2019 with an available echocardiogram (n=396). We stratified patients according to the presence (n=51) or absence of pericardial effusion (n=345) and compared demographic, clinical, imaging, and laboratory data. A p-value <0.05 was considered statistically significant. Results: We found a prevalence of pericardial effusion in PWH of 4.5%. There was no statistically significant difference in age, gender, or race between groups. PWH with pericardial effusion had higher creatinine (2.1 mg/dL vs. 1.6 mg/dL, p=0.025) and pro-BNP (12,088 pg/mL vs. 6364 pg/mL, p=0.021) levels, were more likely to have chronic kidney disease (43.1% vs. 18%, p<0.001), tricuspid regurgitation (64.6% vs. 44.2%, p=0.009), and mitral regurgitation (60.8% vs. 35.9%, p<0.001) compared to PWH without pericardial effusion. There was no difference in CD4 count, CD8 count, viral load, length on ART, or history of tuberculosis between groups. Conclusions: We report a lower prevalence of pericardial effusion in PWH than previous results before the wide availability of ART (around 11%). In PWH with pericardial effusion, we found no association with HIV-related factors or length on ART. In this population, pericardial effusion was associated with comorbidities like chronic kidney disease and valvular abnormalities.Professiona