A big red dot at cosmic noon

Abstract

We report the discovery of a little red dot (LRD), dubbed BiRD ('big red dot'), at $z=2.33$ in the field around the $z=6.3$ quasar SDSSJ1030+0524. Using NIRCam images, we identified it as a bright outlier in the $F200W-F356W$ color vs $F356W$ magnitude diagram of point sources in the field. The NIRCam/WFSS spectrum reveals the emission from HeI$\lambda 10830$ and PaG line, both showing a narrow and a broad ($FWHM\gtrsim 2000\mathrm{km}{\mathrm{s}}^{-1}$) component. The HeI line is affected by an absorption feature, tracing dense gas with HeI column density in the $2^{3}S$ level $N\sim 0.5-1.2\times 10^{14}\mathrm{c}{\mathrm{m}}^{-2}$, depending on the location of the absorber, which is outflowing at the speed of $\Delta v\sim -830\mathrm{km}{\mathrm{s}}^{-1}$. As observed in the majority of LRDs, BiRD does not show X-ray or radio emission. The BH mass and the bolometric luminosity, both inferred from the PaG broad component, amount to $M_{\mathrm{BH}}\sim 10^8{\mathrm{M}}_{\odot }$ and $L_{\mathrm{bol}}\sim 2.9\times 10^{45}\mathrm{erg}{\mathrm{s}}^{-1}$, respectively. Intriguingly, BiRD presents strict analogies with other two LRDs spectroscopically confirmed at cosmic noon, GN-28074 ("Rosetta Stone") at $z=2.26$ and RUBIES-BLAGN-1 at $z=3.1$. The blueshifted HeI absorption detected in all three sources suggests that gas outflows may be common in LRDs. We derive a first estimate of the space density of LRDs at $z<3$ based on JWST data, as a function of $L_{\mathrm{bol}}$ and BH mass. The space density is only a factor of $\sim 2-3$ lower than that of UV-selected quasars with comparable $L_{\mathrm{bol}}$ and $z$, meaning that the contribution of LRDs to the broader AGN population is also relevant at cosmic noon. A similar trend is also observed in terms of BH masses. If, as suggested by recent theories, LRDs probe the very first and rapid growth of black hole seeds, our finding may suggest that the formation of black hole seeds remains efficient at least up to cosmic noon.

14 pages, 7 figures, accepted for publication in A&A

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