English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Direct-collapse black holes (DCBHs) of mass $\sim 10^4$-$10^5 {M}_\odot$ thatform in HI-cooling halos in the early Universe are promising progenitors of the$\gtrsim 10^9 {M}_\odot$ supermassive black holes that fuel observed $z \gtrsim7$ quasars. Efficient accretion of the surrounding gas onto such DCBH seeds mayrender them sufficiently bright for detection with the JWST up to $z\approx20$. Additionally, the very steep and red spectral slope predicted across the$\approx 1$-5 $\mu$m wavelength range of the JWST/NIRSpec instrument duringtheir initial growth phase should make them photometrically identifiable up tovery high redshifts. In this work, we present a search for such DCBH candidatesacross the 34 arcmin$^{2}$ in the first two spokes of the JWST cycle-1 PEARLSsurvey of the north ecliptic pole time-domain field covering eight NIRCamfilters down to a maximum depth of $\sim$ 29 AB mag. We identify two objectswith spectral energy distributions consistent with the Pacucci et al. (2016)DCBH models. However, we also note that even with data in eight NIRCam filters,objects of this type remain degenerate with dusty galaxies and obscured activegalactic nuclei over a wide range of redshifts. Follow-up spectroscopy would berequired to pin down the nature of these objects. Based on our sample of DCBHcandidates and assumptions on the typical duration of the DCBH steep-slopestate, we set a conservative upper limit of $\lesssim 5\times 10^{-4}$ comovingMpc$^{-3}$ (cMpc$^{-3}$) on the comoving density of host halos capable ofhosting DCBHs with spectral energy distributions similar to the Pacucci et al.(2016) models at $z\approx 6$-14.

A search for high-redshift direct-collapse black hole candidates in the PEARLS north ecliptic pole field