Are the host galaxies of Long Gamma-Ray Bursts more compact than star-forming galaxies of the field?

Abstract

(Abridged) Long Gamma-Ray Bursts (GRBs) offer a promising tool to trace the cosmic history of star formation, especially at high redshift where conventional methods are known to suffer from intrinsic biases. Previous studies of GRB host galaxies at low redshift showed that high surface densities of stellar mass and star formation rate (SFR) can potentially enhance the GRB production. We assess how the size, the stellar mass and SFR surface densities of distant galaxies affect their probability to host a long GRB, using a sample of GRB hosts at $z>1$ and a control sample of star-forming sources from the field. We gather a sample of 45 GRB host galaxies at $1<z<3.1$ observed with the Hubble Space Telescope WFC3 camera in the near-infrared. Using the GALFIT parametric approach, we model the GRB host light profile and derive the half-light radius for 35 GRB hosts, which we use to estimate the SFR and stellar mass surface densities of each object. We compare the distribution of these physical quantities to the SFR-weighted properties of a complete sample of star-forming galaxies from the 3D-HST deep survey at comparable redshift and stellar mass. We show that, similarly to $z<1$, GRB hosts are smaller in size and they have higher stellar mass and SFR surface densities than field galaxies at $1<z<2$. Interestingly, this result is robust even when considering separately the hosts of GRBs with optically-bright afterglows and the hosts of dark GRBs. At $z>2$ though, GRB hosts appear to have sizes and stellar mass surface densities more consistent with those characterizing the field galaxies. In addition to a possible trend toward low metallicity environment, other environmental properties such as stellar density appears to play a role in the formation of long GRBs, at least up to $z\sim 2$. This might suggest that GRBs require special environments to be produced.

23 pages, 17 figures, accepted for publication in Astronomy & Astrophysics

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• GRB 241105A: A test case for GRB classification and rapid r-process nucleosynthesis channels
• JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
• Probing evolution of Long GRB properties through their cosmic formation history aided by Machine Learning predicted redshifts
• First joint absorption and T${}_e$-based metallicity measured in a GRB host galaxy at $z=4.28$ using JWST/NIRSpec
• Cosmological Evolution of Gamma Ray Bursts