The miniJPAS Survey: The radial distribution of star formation rates in faint X-ray active galactic nuclei
Astronomy & Astrophysics(2024)
摘要
We study the impact of black hole nuclear activity on both the global and
radial star formation rate (SFR) profiles in X-ray-selected active galactic
nuclei (AGN) in the field of miniJPAS, the precursor of the much wider J-PAS
project. Our sample includes 32 AGN with z<0.3 detected via the
XMM-Newton and Chandra surveys. For comparison, we assembled
a control sample of 71 star-forming (SF) galaxies with similar magnitudes,
sizes, and redshifts.
To derive the global properties of both the AGN and the control SF sample, we
used to fit the spectral energy distributions derived from the
56 narrowband and 4 broadband filters from miniJPAS. We find that AGN tend to
reside in more massive galaxies than their SF counterparts. After matching
samples based on stellar mass and comparing their SFRs and specific SFRs
(sSFRs), no significant differences appear. This suggests that the presence of
AGN does not strongly influence overall star formation.
However, when we used miniJPAS as an integral field unit (IFU) to dissect
galaxies along their position angle, a different picture emerges. We find that
AGN tend to be more centrally concentrated in mass with respect to SF galaxies.
Moreover, we find a suppression of the sSFR up to 1R_e and then an
enhancement beyond 1R_e, strongly contrasting with the decreasing
radial profile of sSFRs in SF galaxies. This could point to an inside-out
quenching of AGN host galaxies.
These findings suggest that the reason we do not see differences on a global
scale is because star formation is suppressed in the central regions and
enhanced in the outer regions of AGN host galaxies. While limited in terms of
sample size, this work highlights the potential of the upcoming J-PAS as a
wide-field low-resolution IFU for thousands of nearby galaxies and AGN.
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