The incidence and star-formation properties of X-ray active galactic nuclei across the star-forming main sequence in DESI-eRASS1: the role of host-galaxy morphology
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| Format: | Preprint |
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2026
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| _version_ | 1866913168637296640 |
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| author | Mountrichas, G. Carrera, F. J. Masoura, V. A. Mateos, S. Siudek, M. Corral, A. |
| author_facet | Mountrichas, G. Carrera, F. J. Masoura, V. A. Mateos, S. Siudek, M. Corral, A. |
| contents | The interplay between star formation and supermassive black-hole growth is central to galaxy evolution, but how host-galaxy morphology regulates star-formation enhancement and AGN triggering across the star-forming main sequence remains unclear. We investigate the star-formation properties and incidence of X-ray AGN across the star-forming main sequence using the DESI-eRASS1 dataset, focusing on host structure. Our analysis includes 1171 X-ray selected AGN and 45374 non-AGN star-forming galaxies at $z\le1.5$. We quantify star formation in AGN hosts relative to matched control samples using ${\rm SFR}_{norm}$ and examine its dependence on X-ray luminosity ($L_X$) and specific accretion rate ($λ_{sBHAR}$). We measure AGN incidence as a function of distance from the star-forming main sequence ($Δ_{\rm MS}$), separating disk- and spheroid-dominated systems based on Sersic index. ${\rm SFR}_{norm}$ remains close to unity at low to intermediate $L_X$ and increases at higher luminosities, with the transition shifting toward higher $L_X$ in more massive systems. This trend depends on morphology: in the stellar-mass range $10.5\le\log(M_\star/M_\odot)<11.5$, disk-dominated AGN hosts exhibit enhanced ${\rm SFR}_{norm}$ at moderate $L_X$, while spheroid-dominated systems remain consistent with unity. No comparable morphology dependence is found when using $λ_{sBHAR}$. The incidence of X-ray AGN increases strongly with $Δ_{\rm MS}$ in both redshift bins, with a steeper dependence at higher redshift. The $Δ_{\rm MS}$-incidence relation is also morphology-dependent and evolves with redshift. The connection between star formation and AGN activity is governed by global gas availability but modulated by host-galaxy structure and cosmic epoch. Absolute AGN power is more tightly linked to host-wide star formation than accretion efficiency normalised by stellar mass. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_28921 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The incidence and star-formation properties of X-ray active galactic nuclei across the star-forming main sequence in DESI-eRASS1: the role of host-galaxy morphology Mountrichas, G. Carrera, F. J. Masoura, V. A. Mateos, S. Siudek, M. Corral, A. Astrophysics of Galaxies The interplay between star formation and supermassive black-hole growth is central to galaxy evolution, but how host-galaxy morphology regulates star-formation enhancement and AGN triggering across the star-forming main sequence remains unclear. We investigate the star-formation properties and incidence of X-ray AGN across the star-forming main sequence using the DESI-eRASS1 dataset, focusing on host structure. Our analysis includes 1171 X-ray selected AGN and 45374 non-AGN star-forming galaxies at $z\le1.5$. We quantify star formation in AGN hosts relative to matched control samples using ${\rm SFR}_{norm}$ and examine its dependence on X-ray luminosity ($L_X$) and specific accretion rate ($λ_{sBHAR}$). We measure AGN incidence as a function of distance from the star-forming main sequence ($Δ_{\rm MS}$), separating disk- and spheroid-dominated systems based on Sersic index. ${\rm SFR}_{norm}$ remains close to unity at low to intermediate $L_X$ and increases at higher luminosities, with the transition shifting toward higher $L_X$ in more massive systems. This trend depends on morphology: in the stellar-mass range $10.5\le\log(M_\star/M_\odot)<11.5$, disk-dominated AGN hosts exhibit enhanced ${\rm SFR}_{norm}$ at moderate $L_X$, while spheroid-dominated systems remain consistent with unity. No comparable morphology dependence is found when using $λ_{sBHAR}$. The incidence of X-ray AGN increases strongly with $Δ_{\rm MS}$ in both redshift bins, with a steeper dependence at higher redshift. The $Δ_{\rm MS}$-incidence relation is also morphology-dependent and evolves with redshift. The connection between star formation and AGN activity is governed by global gas availability but modulated by host-galaxy structure and cosmic epoch. Absolute AGN power is more tightly linked to host-wide star formation than accretion efficiency normalised by stellar mass. |
| title | The incidence and star-formation properties of X-ray active galactic nuclei across the star-forming main sequence in DESI-eRASS1: the role of host-galaxy morphology |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2605.28921 |