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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We exploit wide-field Ly$alpha$ imaging with Subaru to probe the environmentaround TN J1338-1942, a powerful radio galaxy with a >100 kpc Ly$\alpha$ haloat z=4.11. We used a sample of Ly$\alpha$ emitters (LAEs) down to $\log(L_{\rmLy\alpha} [erg\, s^{-1}])\sim 42.8$ to measure the galaxy density aroundTNJ1338, compared to a control sample from a blank field taken with the sameinstrument. We found that TNJ1338 resides in a region with a peak overdensityof $\delta_{\rm LAE}=2.8\pm 0.5$ on scales of $8\, h^{-1}\rm Mpc$ (on the sky)and $112\, h^{-1}\rm Mpc$ (line of sight) in comoving coordinates. Adjacent tothis overdensity, we found a strong underdensity where virtually no LAEs aredetected. We used a semi-analytical model of LAEs derived from the MillenniumSimulation to compare our results with theoretical predictions. While thetheoretical density distribution is consistent with the blank field, overdenseregions such as that around TNJ1338 are very rare, with a number density of$6.4\times 10^{-8}\rm Mpc^{-3}$ (comoving), corresponding to the densest < 0.4percentile at $z\simeq 4.1$. We also found that the Ly$\alpha$ luminosityfunction in the TNJ1338 field differs from that in the blank field: the numberof bright LAEs ($\log(L_{\rm Ly\alpha}[erg\,s^{-1}]) \gtrsim 43.3$) isenhanced, while the number of fainter LAEs is relatively suppressed. Theseresults suggest that some powerful radio galaxies associated with Ly$\alpha$nebulae reside in extreme overdensities on $\sim 3$--$6\, \rm Mpc$ scales,where star-formation and AGN activity may be enhanced via frequent galaxymergers or high rates of gas accretion from the surroundings.

monthly notices of the royal astronomical society

The environments of Ly$\alpha$ blobs I: Wide-field Ly$\alpha$ imaging of  TN J1338-1942, a powerful radio galaxy at $z\simeq 4.1$ associated with a  giant Ly$\alpha$ nebula