Photometric Redshifts in the W-CDF-S and ELAIS-S1 Fields Based on Forced Photometry from 0.36 to 4.5 Microns

Zou, Fan; Yang, Guang; Brandt, W. N.; Ni, Quan Xing; Bauer, F. E.; Covone, G.; Lacy, Mark; Napolitano, N. R.; Nyland, Kristina; Paolillo, M.; Radovich, M.; Spavone, M.; Vaccari, M.

doi:10.3847/2515-5172/abf050

Cited by 9 publications

(24 citation statements)

References 6 publications

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“…The general reliability of the statistical uncertainties of our M å and SFR measurements ultimately arises from the reliability of the statistical uncertainties of the SEDs, which are justified indirectly and independently by the photo-z uncertainties in Zou et al (2021b). They showed that 78% of spec-zs reside in the 68% photo-z intervals.…”

Section: Validation Of M å and Sfr Uncertainties And Nominal Depth As...mentioning

confidence: 81%

Section: Redshiftmentioning

confidence: 99%

“…Our redshifts are from Ni et al (2021a) and Zou et al (2021b). They compiled all the available spectroscopic redshifts (spec-zs) for 30,135 sources in W-CDF-S, and Zou et al (2021b) derived photo-zs for all the sources using EAZY (Brammer et al 2008). However, the photo-zs in Zou et al (2021b) are only valid if the optical-to-NIR emission is not dominated by an AGN, and Ni et al (2021a) derived appropriate photo-zs for AGN-dominated sources.…”

Section: Redshiftmentioning

confidence: 99%

“…The remaining three original DDFs (i.e., W-CDF-S, ELAIS-S1, and XMM-LSS), on the other hand, have not been fully investigated. To prepare for the upcoming LSST era, we have derived forced photometry and photo-zs for these fields in our previous works (Nyland et al 2017;Chen et al 2018;Zou et al 2021aZou et al , 2021bK. Nyland et al 2022, in preparation) and present detailed SED fitting in this work.…”

Section: Introductionmentioning

confidence: 99%

“…We also empirically exclude the sources with z = 0.01. 0.01 is the minimum photo-z value allowed in Zou et al (2021b), and photo-zs reaching this boundary are often caused by failures in photo-z measurements and are hence unreliable. Such sources usually pile up at a single z = 0.01 value.…”

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confidence: 99%

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Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Zou

Brandt

Chen

et al. 2022

ApJS

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W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), but their extensive multiwavelength data have not been fully utilized as done in the COSMOS field, another LSST DDF. To prepare for future science, we fit source spectral energy distributions (SEDs) from X-ray to far-infrared in these three fields mainly to derive galaxy stellar masses and star formation rates. We use CIGALE v2022.0, a code that has been regularly developed and evaluated, for the SED fitting. Our catalog includes 0.8 million sources covering 4.9 deg2 in W-CDF-S, 0.8 million sources covering 3.4 deg2 in ELAIS-S1, and 1.2 million sources covering 4.9 deg2 in XMM-LSS. Besides fitting normal galaxies, we also select candidates that may host active galactic nuclei (AGNs) or are experiencing recent star formation variations and use models specifically designed for these sources to fit their SEDs; this increases the utility of our catalog for various projects in the future. We calibrate our measurements by comparison with those in well-studied smaller regions and briefly discuss the implications of our results. We also perform detailed tests of the completeness and purity of SED-selected AGNs. Our data can be retrieved from a public website.

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Section: Validation Of M å and Sfr Uncertainties And Nominal Depth As...mentioning

confidence: 81%

Section: Redshiftmentioning

confidence: 99%

Section: Redshiftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Zou

Brandt

Chen

et al. 2022

ApJS

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Spitzer-selected z > 1.3 protocluster candidates in the LSST Deep Drilling Fields

Gully,

Hatch,

Bahé

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We have identified 189 candidate z > 1.3 protoclusters and clusters in the LSST Deep Drilling Fields. This sample will enable the measurement of the metal enrichment and star formation history of clusters during their early assembly period through the direct measurement of the rate of supernovae identified through the LSST. The protocluster sample was selected from galaxy overdensities in a Spitzer/IRAC colour-selected sample using criteria that were optimised for protocluster purity using a realistic lightcone. Our tests reveal that $60-80~{{\%}}$ of the identified candidates are likely to be genuine protoclusters or clusters, which is corroborated by a ∼4σ stacked X-ray signal from these structures. We provide photometric redshift estimates for 47 candidates which exhibit strong peaks in the photo-z distribution of their candidate members. However, the lack of a photo-z peak does not mean a candidate is not genuine, since we find a stacked X-ray signal of similar significance from both the candidates that exhibit photo-z peaks and those that do not. Tests on the lightcone reveal that our pursuit of a pure sample of protoclusters results in that sample being highly incomplete ($\sim 4~{{\%}}$) and heavily biased towards larger, richer, more massive, and more centrally concentrated protoclusters than the total protocluster population. Most ($\sim 75~{{\%}}$) of the selected protoclusters are likely to have a maximum collapsed halo mass of between 1013 − 1014 M⊙, with only $\sim 25~{{\%}}$ likely to be collapsed clusters above 1014 M⊙. However, the aforementioned bias ensures our sample is $\sim 50~{{\%}}$ complete for structures that have already collapsed into clusters more massive than 1014 M⊙.

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Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS

Zou,

Brandt,

et al. 2023

ApJ

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Active dwarf galaxies are important because they contribute to the evolution of dwarf galaxies and can reveal their hosted massive black holes. However, the sample size of such sources beyond the local universe is still highly limited. In this work, we search for active dwarf galaxies in the recently completed XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS). XMM-SERVS is currently the largest medium-depth X-ray survey covering 13 deg2 in three extragalactic fields, which all have well-characterized multiwavelength information. After considering several factors that may lead to misidentifications, we identify 73 active dwarf galaxies at z < 1, which constitutes the currently largest X-ray-selected sample beyond the local universe. Our sources are generally less obscured than predictions based on the massive-AGN (active galactic nucleus) X-ray luminosity function and have a low radio-excess fraction. We find that our sources reside in environments similar to those of inactive dwarf galaxies. We further quantify the accretion distribution of the dwarf-galaxy population after considering various selection effects and find that it decreases with X-ray luminosity, but redshift evolution cannot be statistically confirmed. Depending on how we define an AGN, the active fraction may or may not show a strong dependence on stellar mass. Their Eddington ratios and X-ray bolometric corrections significantly deviate from the expected relation, which is likely caused by several large underlying systematic biases when estimating the relevant parameters for dwarf galaxies. Throughout this work, we also highlight problems in reliably measuring photometric redshifts and overcoming strong selection effects for distant active dwarf galaxies.

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Photometric Redshifts in the W-CDF-S and ELAIS-S1 Fields Based on Forced Photometry from 0.36 to 4.5 Microns

Cited by 9 publications

References 6 publications

Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Spitzer-selected z > 1.3 protocluster candidates in the LSST Deep Drilling Fields

Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS

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Photometric Redshifts in the W-CDF-S and ELAIS-S1 Fields Based on Forced Photometry from 0.36 to 4.5 Microns

Cited by 9 publications

References 6 publications

Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Spitzer-selected z &gt; 1.3 protocluster candidates in the LSST Deep Drilling Fields

Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS

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Spitzer-selected z > 1.3 protocluster candidates in the LSST Deep Drilling Fields