Probing the parameters of the intergalactic medium using quasars (2022)
Journal Article
Dalton, T., Morris, S. L., Fumagalli, M., & Gatuzz, E. (2022). Probing the parameters of the intergalactic medium using quasars. Monthly Notices of the Royal Astronomical Society, 513(1), 822-834. https://doi.org/10.1093/mnras/stac814

We continue our series of papers on intergalactic medium (IGM) tracers using quasi-stellar objects (QSOs), having examined gamma-ray bursts (GRBs) and blazars in earlier studies. We have estimated the IGM properties of hydrogen column density (⁠NHXIG... Read More about Probing the parameters of the intergalactic medium using quasars.

Probing the physical properties of the intergalactic medium using blazars (2021)
Journal Article
Dalton, T., Morris, S. L., Fumagalli, M., & Gatuzz, E. (2021). Probing the physical properties of the intergalactic medium using blazars. Monthly Notices of the Royal Astronomical Society, 508(2), 1701-1718. https://doi.org/10.1093/mnras/stab2597

We use Swift blazar spectra to estimate the key intergalactic medium (IGM) properties of hydrogen column density (NHXIGM), metallicity, and temperature over a redshift range of 0.03 ≤ z ≤ 4.7, using a collisional ionization equilibrium model for the... Read More about Probing the physical properties of the intergalactic medium using blazars.

Probing the physical properties of the intergalactic medium using gamma-ray bursts (2021)
Journal Article
Dalton, T., Morris, S. L., & Fumagalli, M. (2021). Probing the physical properties of the intergalactic medium using gamma-ray bursts. Monthly Notices of the Royal Astronomical Society, 502(4), 5981-5996. https://doi.org/10.1093/mnras/stab335

We use gamma-ray burst (GRB) spectra total continuum absorption to estimate the key intergalactic medium (IGM) properties of hydrogen column density (⁠NHXIGM⁠), metallicity, temperature, and ionization parameter over a redshift range of 1.6 ≤ z ≤ 6.3... Read More about Probing the physical properties of the intergalactic medium using gamma-ray bursts.

Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density (2020)
Journal Article
Morris, S. L., & Dalton, T. (2020). Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density. Monthly Notices of the Royal Astronomical Society, 495(2), 2342-2353. https://doi.org/10.1093/mnras/staa1321

It is known that the GRB equivalent hydrogen column density (NHX) changes with redshift and that, typically, NHX is greater than the GRB host neutral hydrogen column density. We have compiled a large sample of data for GRB NHX and metallicity [X/H].... Read More about Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density.