ChinaXiv.org 中国科学院科技论文预发布平台

Submitted Date

2023
6

Subjects

Astrophysical processes
6

Authors

Institution

result total 6.

Hide Summary

Hits

Date

Downloads

Your conditions: Bren E. Backhaus

1. ChinaXiv:202303.05800
Download

First Look at z > 1 Bars in the Rest-Frame Near-Infrared with JWST Early CEERS Imaging

Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19

Yuchen Guo Shardha Jogee Steven L. Finkelstein Zilei Chen Eden Wise Micaela B. Bagley Guillermo Barro Stijn Wuyts Dale D. Kocevski Jeyhan S. Kartaltepe Elizabeth J. McGrath Henry C. Ferguson Bahram Mobasher Mauro Giavalisco Ray A. Lucas Jorge A. Zavala Jennifer M. Lotz Norman A. Grogin Marc Huertas-Company Jesús Vega-Ferrero

Abstract： Stellar bars are key drivers of secular evolution in galaxies and can be effectively studied using rest-frame near-infrared (NIR) images, which trace the underlying stellar mass and are less impacted by dust and star formation than rest-frame UV or optical images. We leverage the power of {\it{JWST}} CEERS NIRCam images to present the first quantitative identification and characterization of stellar bars at $z>1$ based on rest-frame NIR F444W images of high resolution (~1.3 kpc at z ~ 1-3). We identify stellar bars in these images using quantitative criteria based on ellipse fits. For this pilot study, we present six examples of robustly identified bars at $z>1$ with spectroscopic redshifts, including the two highest redshift bars at ~2.136 and 2.312 quantitatively identified and characterized to date. The stellar bars at $z$ ~ 1.1-2.3 presented in our study have projected semi-major axes of ~2.9-4.3 kpc and projected ellipticities of ~0.41-0.53 in the rest-frame NIR. The barred host galaxies have stellar masses ~ $ 1 \times 10^{10}$ to $2 \times 10^{11}$ $M_{\odot}$, star formation rates of ~ 21-295 $M_{\odot}$ yr$^{-1}$, and several have potential nearby companions. Our finding of bars at $z$ ~1.1-2.3 demonstrates the early onset of such instabilities and supports simulations where bars form early in massive dynamically cold disks. It also suggests that if these bars at lookback times of 8-10 Gyr survive out to present epochs, bar-driven secular processes may operate over a long time and have a significant impact on some galaxies by z ~ 0.

Peer Review Status:Awaiting Review

Hits 31 Downloads 28 Comment
2. ChinaXiv:202303.03219
Download

Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations

Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19

Jorge A. Zavala Veronique Buat Caitlin M. Casey Denis Burgarella Steven L. Finkelstein Micaela B. Bagley Laure Ciesla Emanuele Daddi Mark Dickinson Henry C. Ferguson Maximilien Franco E. F. Jim'enez-Andrade Jeyhan S. Kartaltepe Anton M. Koekemoer Aurélien Le Bail E. J. Murphy Casey Papovich Sandro Tacchella Stephen M. Wilkins Itziar Aretxaga

Abstract： Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources are expected to drop out in the bluer filters while being well detected in redder filters. However, here we show that dust-enshrouded star-forming galaxies at lower redshifts (z<7) may also mimic the near-infrared (near-IR) colors of z>10 LBGs, representing potential contaminants in LBG candidate samples. First, we analyze CEERS-DSFG-1, a NIRCam dropout undetected in the F115W and F150W filters but detected at longer wavelengths. Combining the JWST data with (sub)millimeter constraints, including deep NOEMA interferometric observations, we show that this source is a dusty star-forming galaxy (DSFG) at z~5.1. We also present a tentative 2.6sigma SCUBA-2 detection at 850um around a recently identified z~16 LBG candidate in the same field and show that, if the emission is real and associated with this candidate, the available photometry is consistent with a z~5 dusty galaxy with strong nebular emission lines despite its blue near-IR colors. Further observations on this candidate are imperative to mitigate the low confidence of this tentative submillimeter emission and its positional uncertainty. Our analysis shows that robust (sub)millimeter detections of NIRCam dropout galaxies likely imply z=4-6 redshift solutions, where the observed near-IR break would be the result of a strong rest-frame optical Balmer break combined with high dust attenuation and strong nebular line emission, rather than the rest-frame UV Lyman break. This provides evidence that DSFGs may contaminate searches for ultra high-redshift LBG candidates from JWST observations.

Peer Review Status:Awaiting Review

Hits 49 Downloads 36 Comment
3. ChinaXiv:202303.03680
Download

The Next Generation Deep Extragalactic Exploratory Public (NGDEEP) Survey

Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19

Micaela B. Bagley Nor Pirzkal Steven L. Finkelstein Casey Papovich Danielle A. Berg Jennifer M. Lotz Gene C. K. Leung Henry C. Ferguson Anton M. Koekemoer Mark Dickinson Jeyhan S. Kartaltepe Dale D. Kocevski Rachel S. Somerville L. Y. Aaron Yung Bren E. Backhaus Caitlin M. Casey Marco Castellano Óscar A. Chávez Ortiz Katherine Chworowsky Isabella G. Cox

Abstract： We present the Next Generation Deep Extragalactic Exploratory Public (NGDEEP) Survey, a deep slitless spectroscopic and imaging Cycle 1 JWST treasury survey designed to constrain feedback mechanisms in low-mass galaxies across cosmic time. NGDEEP targets the Hubble Ultra Deep Field (HUDF) with NIRISS slitless spectroscopy (f~1.2e-18 erg/s/cm^2, 5sigma) to measure metallicities and star-formation rates (SFRs) for low-mass galaxies through the peak of the cosmic SFR density (0.512, constraining the slope of the faint-end of the rest-ultraviolet luminosity function. NGDEEP overlaps with the deepest HST ACS optical imaging in the sky: F435W in the HUDF (m=29.6), and F814W in HUDF-Par2 (m=30), making this a premier HST+JWST Deep Field. As a treasury survey, NGDEEP data is public immediately, and we will rapidly release data products and catalogs in the spirit of previous deep field initiatives. In this paper we present the NGDEEP survey design, summarize the science goals, and detail plans for the public release of NGDEEP reduced data products.

Peer Review Status:Awaiting Review

Hits 37 Downloads 32 Comment
4. ChinaXiv:202303.03324
Download

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

Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19

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 Véronique Buat Antonello Calabrò Caitlin M. Casey Nikko J. Cleri Rosemary T. Coogan M. C. Cooper Asantha R. Cooray

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, F356W<27.5 mag. The nature of these sources is threefold: (1) 71% are dusty star-forming galaxies at 2100 Gyr^-1); (2) 18% are quiescent/dormant (i.e., subject to reignition and rejuvenation) galaxies at 3展开 -->

Peer Review Status:Awaiting Review

Hits 35 Downloads 31 Comment
5. ChinaXiv:202303.02377
Download

CEERS Key Paper III: The Diversity of Galaxy Structure and Morphology at z=3-9 with JWST

Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19

Jeyhan S. Kartaltepe Caitlin Rose Brittany N. Vanderhoof Elizabeth J. McGrath Luca Costantin Isabella G. Cox L. Y. Aaron Yung Dale D. Kocevski Stijn Wuyts Henry C. Ferguson Brett H. Andrews Micaela B. Bagley Steven L. Finkelstein Ricardo O. Amorin Pablo Arrabal Haro Bren E. Backhaus Peter Behroozi Laura Bisigello Antonello Calabro Caitlin M. Casey Rosemary T. Coogan

Abstract： We present a comprehensive analysis of the evolution of the morphological and structural properties of a large sample of galaxies at z=3-9 using early JWST CEERS NIRCam observations. Our sample consists of 850 galaxies at z>3 detected in both CANDELS HST imaging and JWST CEERS NIRCam images to enable a comparison of HST and JWST morphologies. Our team conducted a set of visual classifications, with each galaxy in the sample classified by three different individuals. We also measure quantitative morphologies using the publicly available codes across all seven NIRCam filters. Using these measurements, we present the fraction of galaxies of each morphological type as a function of redshift. Overall, we find that galaxies at z>3 have a wide diversity of morphologies. Galaxies with disks make up a total of 60\% of galaxies at z=3 and this fraction drops to ~30% at z=6-9, while galaxies with spheroids make up ~30-40% across the whole redshift range and pure spheroids with no evidence for disks or irregular features make up ~20%. The fraction of galaxies with irregular features is roughly constant at all redshifts (~40-50%), while those that are purely irregular increases from ~12% to ~20% at z>4.5. We note that these are apparent fractions as many selection effects impact the visibility of morphological features at high redshift. The distributions of S\'ersic index, size, and axis ratios show significant differences between the morphological groups. Spheroid Only galaxies have a higher S\'ersic index, smaller size, and higher axis ratio than Disk/Irregular galaxies. Across all redshifts, smaller spheroid and disk galaxies tend to be rounder. Overall, these trends suggest that galaxies with established disks and spheroids exist across the full redshift range of this study and further work with large samples at higher redshift is needed to quantify when these features first formed.

Peer Review Status:Awaiting Review

Hits 40 Downloads 27 Comment 0
6. ChinaXiv:202303.02409
Download

CEERS: Spatially Resolved UV and mid-IR Star Formation in Galaxies at 0.2 < z < 2.5: The Picture from the Hubble and James Webb Space Telescopes

Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19

Lu Shen Casey Papovich Guang Yang Jasleen Matharu Xin Wang Benjamin Magnelli David Elbaz Shardha Jogee Anahita Alavi Pablo Arrabal Haro Bren E. Backhaus Micaela B. Bagley Eric F. Bell Laura Bisigello Antonello Calabrò M. C. Cooper Luca Costantin Emanuele Daddi Mark Dickinson Steven L. Finkelstein

Abstract： We present the mid-IR (MIR) morphologies for 70 star-forming galaxies (SFGs) at $0.210^{9}~M_\odot}$ using JWST MIRI observations from the Cosmic Evolution Early Release Science survey (CEERS). The MIRI bands span the MIR (7.7--21 $\mu$m), enabling us to measure the effective radii ($R_{\mathrm{eff}}$) and S\'{e}rsic indexes of these SFGs at rest-frame 6.2 and 7.7 $\mu$m, which contains strong emission from Polycyclic aromatic hydrocarbon (PAH) features, a well-established tracer of star formation in galaxies. We compare the PAH-band morphologies to those in rest-frame Near-UV (NUV) using HST ACS/F435W or ACS/F606W and optical/near-IR using HST WFC3/F160W imaging from UVCANDELS and CANDELS, where the NUV-band and F160W trace the profile of (unobscured) massive stars and the stellar continuum, respectively. The $R_{\mathrm{eff}}$ of galaxies in the PAH-band are slightly smaller ($\sim$10) than those in F160W for more massive galaxies with $\mathrm{M_*\gtrsim10^{9.5}~M_\odot}$ at $z\leq1.2$ and with $\mathrm{M_*\gtrsim10^{10}~M_\odot}$ at $z\geq1.2$, but the PAH-band and F160W have a similar fractions of light within 1 kpc. In contrast, the $R_{\rm{eff}}$ of galaxies in the NUV-band are larger, with lower fractions of light within 1 kpc compared to the F160W for galaxies at $z\leq1.2$. Using the MIRI data to estimate the surface density of the IR-based SFR, we find the correlation between the IR-based SFR surface density and stellar mass has a steeper slope than that of the UV-based surface density and stellar mass, suggesting galaxies with higher stellar masses having increasing amounts of obscured fraction of star formation in their inner regions. This paper demonstrates how the high-angular resolution data from JWST/MIRI can reveal new information about the morphology of obscured-star formation.

Peer Review Status:Awaiting Review

Hits 32 Downloads 23 Comment 0

First Look at z > 1 Bars in the Rest-Frame Near-Infrared with JWST Early CEERS Imaging

Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations

The Next Generation Deep Extragalactic Exploratory Public (NGDEEP) Survey

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

CEERS Key Paper III: The Diversity of Galaxy Structure and Morphology at z=3-9 with JWST

CEERS: Spatially Resolved UV and mid-IR Star Formation in Galaxies at 0.2 < z < 2.5: The Picture from the Hubble and James Webb Space Telescopes