Tracing High-<i>z</i> Galaxies in X-Rays with JWST and Chandra
Abstract We leverage James Webb Space Telescope (JWST) data from the COSMOS-Web survey in order to provide updated measurements on the auto-power spectrum of the now resolved cosmic near-infrared background (CIB) and its coherence with the unresolved soft cosmic X-ray background (CXB) observed by Chandra at z > 6. Maps of the CIB in the F277W and F444W NIRCam filters are constructed with sources fainter than m AB = 25 and cross-correlated with the CXB in the [0.5–2] keV band. We find that on scales between 1″ and 1000″ the CIB–CXB cross-power in both NIRCam filters is statistically significant, with signal-to-noise ratios (S/Ns) of 4.80 and 6.20, respectively, from redshifts 0 ≤ z ≤ 13. In our high- z (6 ≤ z ≤ 13) interval we find coherence in both filters, with S/Ns of 7.32 and 5.39, respectively. These results suggest that there are X-ray-emitting galaxies resolved by JWST, including star-forming galaxies and active galactic nuclei. We fit the large-scale biasing of the IR sources producing the CIB as a function of z with results consistent with prior measurements, and place constraints on the CXB flux and biasing at low and high z . The CXB flux measurements presented in this study suggest that approximately 94% of the [0.5–2] keV CXB is resolved, and this value is consistent within 2 σ with the complete resolution of the [0.5–2] keV CXB.
Authors
- Marko Shuntov (ORCID: https://orcid.org/0000-0002-7087-0701)
- G. Gozaliasl (ORCID: https://orcid.org/0000-0002-0236-919X)
- Aidan Kaminsky
- Joyce S. Sterling (ORCID: https://orcid.org/0000-0002-2064-6429)
- A. Kashlinsky (ORCID: https://orcid.org/0000-0003-2156-078X)
- H. J. McCracken (ORCID: https://orcid.org/0000-0002-9489-7765)
- Nicole E. Drakos (ORCID: https://orcid.org/0000-0003-4761-2197)
- Anton M. Koekemoer (ORCID: https://orcid.org/0000-0002-6610-2048)
- G. Hasinger (ORCID: https://orcid.org/0000-0002-0797-0646)
- Giulia Cerini (ORCID: https://orcid.org/0000-0002-5273-4634)
- Caitlin M. Casey (ORCID: https://orcid.org/0000-0002-0930-6466)
- O. Ilbert (ORCID: https://orcid.org/0000-0002-7303-4397)
- N. Cappelluti (ORCID: https://orcid.org/0000-0002-1697-186X)
- Alessandro Peca (ORCID: https://orcid.org/0000-0003-2196-3298)
- Jason Rhodes (ORCID: https://orcid.org/0000-0002-4485-8549)
- Brant E. Robertson (ORCID: https://orcid.org/0000-0002-4271-0364)
- Jeyhan S. Kartaltepe (ORCID: https://orcid.org/0000-0001-9187-3605)
- Andreas L. Faisst (ORCID: https://orcid.org/0000-0002-9382-9832)
Institutions
- California Institute of Technology (US)
- University of Copenhagen (DK)
- Centre National de la Recherche Scientifique (FR)
- Space Telescope Science Institute (US)
- Goddard Space Flight Center (US)
- Jet Propulsion Laboratory (US)
- University of Helsinki (FI)
- University of Miami (US)
- University of California, Santa Barbara (US)
- Rochester Institute of Technology (US)
- University of California, Santa Cruz (US)
- Aix-Marseille Université (FR)
- Helsinki Institute of Physics (FI)
- Institut d'Astrophysique de Paris (FR)
- Yale University (US)
- University of Hawaii at Hilo (US)
- Sorbonne Université (FR)
- Université Bourgogne Franche-Comté (FR)
- Eureka Scientific (US)
- Infrared Processing and Analysis Center (US)
- University of Maryland, College Park (US)
- Technische Universität Dresden (DE)
- The University of Texas at Austin (US)
- Aalto University (FI)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2025-06-25
- DOI
- https://doi.org/10.3847/1538-4357/adcede
- Citations
- 2
- Primary Topic
- Galaxies: Formation, Evolution, Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- National Aeronautics and Space Administration
- University of Miami