A simple model of dust extinction in gamma-ray burst host galaxies
arXiv:2409.03570 · doi:10.1051/0004-6361/202450601
Abstract
Gamma-ray burst (GRB) afterglows are powerful probes for studying the different properties of their host galaxies (e.g., the interstellar dust) at all redshifts. By fitting their spectral energy distribution (SED) over a large range of wavelengths, we can gain direct insights into the properties of the interstellar dust by studying the extinction curves. Unlike the dust extinction templates, such as the average Milky Way (MW) or the Small and Large Magellanic Cloud (SMC and LMC), the extinction curves of galaxies outside the Local Group exhibit deviation from these laws. Altogether, X-ray and gamma-ray satellites as well as ground-based telescopes, such as Neil Gehrels Swift Observatory (Swift) and Gamma-Ray Optical and Near-Infrared Detector (GROND), provide measurements of the afterglows from the X-ray to the NIR, which can be used to extract information on dust extinction curves along their lines of sight. The study presented in this paper undertakes such a photometric study, comprising a preparatory work for the SVOM mission and its ground-based follow-up telescope COLIBRI. We propose a simple parameterization of the dust extinction curve of GRB host galaxies. Our model is based on a power law form with the addition of a Loretzian-like Drude profile with two parameters: the extinction slope, , and the 2175 bump amplitude, $E_\rm{b}$. Using the seven GROND filter bands, we tested our dust extinction model and explored the parameter space in extinction and redshift by fitting SEDs of simplified simulations of GRB afterglow spectra based on different extinction curve templates. From a final sample of 10 real Swift/GROND extinguished GRBs, we determined the quantities of the dust extinction in their host and measured their extinction curves. The measured average extinction curve is equivalent to a quasi-featureless in-between SMC-LMC template.
References in corpus (13)
- HI4PI: A full-sky HI survey based on EBHIS and GASS
- An online repository of Swift/XRT light curves of GRBs
- An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
- GROND - a 7-channel imager
- Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow
- The properties of the 2175AA extinction feature discovered in GRB afterglows
- Galaxy gas as obscurer: I. GRBs x-ray galaxies and find a N_H ~ M* relation
- On Dust Extinction of Gamma-ray Burst Host Galaxies
- The cosmic build-up of dust and metals. Accurate abundances from GRB-selected star-forming galaxies at
- Geometry effects on dust attenuation curves with different grain sources at high redshift
- Probing GRB environments with time variability: ULTRASPEC fast imaging of GRB 080210
- A photometric redshift of for the \agile GRB 080514B
- Effects of dust sources on dust attenuation properties in IllustrisTNG galaxies at