Professor JAMES BOLTON's Outputs (85)

Searching for the shadows of giants II: the effect of local ionisation on the Lyman-alpha absorption signatures of protoclusters at redshift z=2.4 (2021)
Journal Article
Miller, J., Bolton, J., & Hatch, N. (2021). Searching for the shadows of giants II: the effect of local ionisation on the Lyman-alpha absorption signatures of protoclusters at redshift z=2.4. Monthly Notices of the Royal Astronomical Society, 506(4), 6001-6013. https://doi.org/10.1093/mnras/stab2083

Local variations in the intergalactic medium (IGM) neutral hydrogen fraction will affect the Ly α absorption signature of protoclusters identified in tomographic surveys. Using the IllustrisTNG simulations, we investigate how the AGN proximity effect... Read More about Searching for the shadows of giants II: the effect of local ionisation on the Lyman-alpha absorption signatures of protoclusters at redshift z=2.4.

The detectability of strong 21-cm forest absorbers from the diffuse intergalactic medium in late reionization models (2021)
Journal Article
Šoltinskí, T., Bolton, J. S., Hatch, N., Haehnelt, M. G., Keating, L. C., Kulkarni, G., Puchwein, E., Chardin, J., & Aubert, D. (2021). The detectability of strong 21-cm forest absorbers from the diffuse intergalactic medium in late reionization models. Monthly Notices of the Royal Astronomical Society, 506(4), 5818–5835. https://doi.org/10.1093/mnras/stab1830

A late end to reionization at redshift z ≈ 5.3 is consistent with observed spatial variations in the Ly α forest transmission and the deficit of Ly α emitting galaxies around extended Ly α absorption troughs at z = 5.5. In this model, large islands o... Read More about The detectability of strong 21-cm forest absorbers from the diffuse intergalactic medium in late reionization models.

The detectability of strong 21-cm forest absorbers from the diffuse intergalactic medium in late reionization models (2021)
Journal Article
Šoltinsky, T., Bolton, J. S., Hatch, N., Haehnelt, M. G., Keating, L. C., Kulkarni, G., Puchwein, E., Chardin, J., & Aubert, D. (2021). The detectability of strong 21-cm forest absorbers from the diffuse intergalactic medium in late reionization models. Monthly Notices of the Royal Astronomical Society, 506(4), 5818-5835. https://doi.org/10.1093/mnras/stab1830

A late end to reionization at redshift z 5.3 is consistent with observed spatial variations in the Ly α forest transmission and the deficit of Ly α emitting galaxies around extended Ly α absorption troughs at z = 5.5. In this model, large islands of... Read More about The detectability of strong 21-cm forest absorbers from the diffuse intergalactic medium in late reionization models.

The evolution of the low-density H i intergalactic medium from z = 3.6 to 0: Data, transmitted flux, and H i column density (2020)
Journal Article
Kim, T.-S., Wakker, B. P., Nasir, F., Carswell, R. F., Savage, B. D., Bolton, J. S., Fox, A. J., Viel, M., Haehnelt, M. G., Charlton, J. C., & Rosenwasser, B. E. (2021). The evolution of the low-density H i intergalactic medium from z = 3.6 to 0: Data, transmitted flux, and H i column density. Monthly Notices of the Royal Astronomical Society, 501(4), 5811-5833. https://doi.org/10.1093/mnras/staa3844

We present a new, uniform analysis of the H I transmitted flux (F) and H I column density (⁠NHI⁠) distribution in the low-density IGM as a function of redshift z for 0 < z < 3.6 using 55 HST/COS FUV (Δz = 7.2 at z < 0.5), five HST/STIS+COS NUV (Δz =... Read More about The evolution of the low-density H i intergalactic medium from z = 3.6 to 0: Data, transmitted flux, and H i column density.

Probing the thermal state of the intergalactic medium at z > 5 with the transmission spikes in high-resolution Lyαforest spectra (2020)
Journal Article
Gaikwad, P., Rauch, M., Haehnelt, M. G., Puchwein, E., Bolton, J. S., Keating, L. C., Kulkarni, G., Iršič, V., Bañados, E., Becker, G. D., Boera, E., Zahedy, F. S., Chen, H.-W., Carswell, R. F., Chardin, J., & Rorai, A. (2020). Probing the thermal state of the intergalactic medium at z > 5 with the transmission spikes in high-resolution Lyαforest spectra. Monthly Notices of the Royal Astronomical Society, 494(4), 5091–5109. https://doi.org/10.1093/mnras/staa907

Searching for the shadows of giants: characterizing protoclusters with line of sight Lyman-α absorption (2019)
Journal Article
Miller, J. S. A., Bolton, J. S., & Hatch, N. (2019). Searching for the shadows of giants: characterizing protoclusters with line of sight Lyman-α absorption. Monthly Notices of the Royal Astronomical Society, 489(4), 5381-5397. https://doi.org/10.1093/mnras/stz2504

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We use state-of-the-art hydrodyamical simulations from the Sherwood, EAGLE, and Illustris projects to examine the signature of Mz = 0 ≃ 1014 M prot... Read More about Searching for the shadows of giants: characterizing protoclusters with line of sight Lyman-α absorption.

Revealing reionization with the thermal history of the intergalactic medium: new constrainst from the Lyα flux power spectrum (2019)
Journal Article
Boera, E., Becker, G. D., Bolton, J. S., & Nasir, F. (2019). Revealing reionization with the thermal history of the intergalactic medium: new constrainst from the Lyα flux power spectrum. Astrophysical Journal, 872(1), 1-35. https://doi.org/10.3847/1538-4357/aafee4

We present a new investigation of the thermal history of the intergalactic medium (IGM) during and after reionization using the Lyman-α forest flux power spectrum at 4.0 z 5.2. Using a sample of 15 high– resolution spectra, we measure the flux power... Read More about Revealing reionization with the thermal history of the intergalactic medium: new constrainst from the Lyα flux power spectrum.

A new measurement of the intergalactic temperature at z∼2.55 − 2.95 (2017)
Journal Article
Rorai, A., Carswell, R., Haehnelt, M. G., Becker, G. D., Bolton, J. S., & Murphy, M. T. (2017). A new measurement of the intergalactic temperature at z∼2.55 − 2.95. Monthly Notices of the Royal Astronomical Society, 474(3), 2871-2883. https://doi.org/10.1093/mnras/stx2862

We present two measurements of the temperature-density relationship (TDR) of the intergalactic medium (IGM) in the redshift range 2.55 < z < 2.95 using a sample of 13 high-quality quasar spectra and high resolution numerical simulations of the IGM. O... Read More about A new measurement of the intergalactic temperature at z∼2.55 − 2.95.

First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations (2017)
Journal Article
Irsic, V., Viel, M., Haehnelt, M. G., Bolton, J. S., & Becker, G. D. (2017). First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations. Physical Review Letters, 119(3), Article 031302. https://doi.org/10.1103/PhysRevLett.119.031302

We present constraints on the masses of extremely light bosons dubbed fuzzy dark matter from Lyman- α forest data. Extremely light bosons with a De Broglie wavelength of ~ 1 kpc have been suggested as dark matter candidates that may resolve some of t... Read More about First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations.

New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-alpha forest data (2017)
Journal Article
Iršič, V., Viel, M., Haehnelt, M. G., Bolton, J. S., Cristiani, S., Becker, G. D., D'Odorico, V., Cupani, G., Kim, T.-S., Berg, T. A., López, S., Ellison, S., Christensen, L., Denny, K. D., & Worseck, G. (2017). New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-alpha forest data. Physical Review D, 96(2), Article 023522. https://doi.org/10.1103/PhysRevD.96.023522

We present new measurements of the free-streaming of warm dark matter (WDM) from Lyman-α flux-power spectra. We use data from the medium resolution, intermediate redshift XQ-100 sample observed with the X-shooter spectrograph (z = 3 – 4.2) and the hi... Read More about New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-alpha forest data.

The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite (2017)
Journal Article
Sijacki, D., Puchwein, E., Haehnelt, M. G., Nasir, F., Bolton, J. S., Viel, M., & Kim, T.-S. (2017). The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite. Monthly Notices of the Royal Astronomical Society, 471(1), 1056-1069. https://doi.org/10.1093/mnras/stx1648

We study the effect of different feedback prescriptions on the properties of the low redshift (z ≤ 1.6) Ly α forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback... Read More about The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite.

Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite (2017)
Journal Article
Meiksin, A., Bolton, J. S., & Puchwein, E. (2017). Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite. Monthly Notices of the Royal Astronomical Society, 468(2), 1893-1901. https://doi.org/10.1093/mnras/stx191

Modern theories of galaxy formation predict that galaxies impact on their gaseous surroundings, playing the fundamental role of regulating the amount of gas converted into stars. While star-forming galaxies are believed to provide feedback through ga... Read More about Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite.

Diagnosing galactic feedback with line broadening in the low redshift Lyα forest (2017)
Journal Article
Viel, M., Haehnelt, M. G., Bolton, J. S., Kim, T.-S., Puchwein, E., Nasir, F., & Wakker, B. P. (2017). Diagnosing galactic feedback with line broadening in the low redshift Lyα forest. Monthly Notices of the Royal Astronomical Society: Letters, 467(1), L86-L90. https://doi.org/10.1093/mnrasl/slx004

We compare the low-redshift (z 0.1) Lyα forest from hydrodynamical simulations with data from the Cosmic Origins Spectrograph. We find the tension between the observed number of lines with b-parameters in the range of 25–45 km s−1 and the prediction... Read More about Diagnosing galactic feedback with line broadening in the low redshift Lyα forest.

The Lyman α forest power spectrum from the XQ-100 legacy survey (2016)
Journal Article
Irsic, V., Viel, M., Berg, T. A., D'Odorico, V., Haehnelt, M. G., Cristiani, S., Cupani, G., Kim, T.-S., López, S., Ellison, S., Becker, G. D., Christensen, L., Denney, K. D., Worseck, G., & Bolton, J. S. (2016). The Lyman α forest power spectrum from the XQ-100 legacy survey. Monthly Notices of the Royal Astronomical Society, 466(4), 4332-4345. https://doi.org/10.1093/mnras/stw3372

We present the Lyman α flux power spectrum measurements of the XQ-100 sample of quasar spectra obtained in the context of the European Southern Observatory Large Programme ‘Quasars and their absorption lines: a legacy survey of the high redshift univ... Read More about The Lyman α forest power spectrum from the XQ-100 legacy survey.

Exploring the thermal state of the low-density intergalactic medium at z = 3 with an ultra-high signal-to-noise QSO spectrum (2016)
Journal Article
Rorai, A., Becker, G. D., Haehnelt, M. G., Carswell, R., Bolton, J. S., Cristiani, S., D'Odorico, V., Cupani, G., Barai, P., Calura, F., Kim, T.-S., Pomante, E., Tescari, E., & Viel, M. (2016). Exploring the thermal state of the low-density intergalactic medium at z = 3 with an ultra-high signal-to-noise QSO spectrum. Monthly Notices of the Royal Astronomical Society, 466(3), 2690-2709. https://doi.org/10.1093/mnras/stw2917

At low densities, the standard ionization history of the intergalactic medium (IGM) predicts a decreasing temperature of the IGM with decreasing density once hydrogen (and helium) reionization is complete. Heating the high-redshift, low-density IGM a... Read More about Exploring the thermal state of the low-density intergalactic medium at z = 3 with an ultra-high signal-to-noise QSO spectrum.

The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5 (2016)
Journal Article
Bolton, J. S., Puchwein, E., Sijacki, D., Haehnelt, M. G., Kim, T.-S., Meiksin, A., Regan, J. A., & Viel, M. (2017). The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5. Monthly Notices of the Royal Astronomical Society, 464(1), 897-914. https://doi.org/10.1093/mnras/stw2397

We introduce a new set of large-scale, high-resolution hydrodynamical simulations of the intergalactic medium: the Sherwood simulation suite. These are performed in volumes of 103–1603h−3 comoving Mpc3, span almost four orders of magnitude in mass re... Read More about The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5.

Inferring the IGM thermal history during reionization with the Lyman α forest power spectrum at redshiftz≃ 5 (2016)
Journal Article
Nasir, F., Bolton, J. S., & Becker, G. D. (2016). Inferring the IGM thermal history during reionization with the Lyman α forest power spectrum at redshiftz≃ 5. Monthly Notices of the Royal Astronomical Society, 463(3), 2335-2347. https://doi.org/10.1093/mnras/stw2147

We use cosmological hydrodynamical simulations to assess the feasibility of constraining the thermal history of the intergalactic medium during reionisation with the Lyα forest at z ≃ 5. The integrated thermal history has a measureable impact on the... Read More about Inferring the IGM thermal history during reionization with the Lyman α forest power spectrum at redshiftz≃ 5.

Testing the effect of galactic feedback on the IGM at z∼ 6 with metal-line absorbers (2016)
Journal Article
Keating, L. C., Puchwein, E., Haehnelt, M. G., Bird, S., & Bolton, J. S. (2016). Testing the effect of galactic feedback on the IGM at z∼ 6 with metal-line absorbers. Monthly Notices of the Royal Astronomical Society, 461(1), 606-626. https://doi.org/10.1093/mnras/stw1306

We present models of low- and high-ionization metal-line absorbers (O i, C ii, C iv and Mg ii) during the end of the reionization epoch, at z ∼ 6. Using four cosmological hydrodynamical simulations with different feedback schemes (including the Illus... Read More about Testing the effect of galactic feedback on the IGM at z∼ 6 with metal-line absorbers.

Constraining the temperature–density relation of the intergalactic medium with the Lyman α and β forests (2015)
Journal Article
Boera, E., Murphy, M. T., Becker, G. D., & Bolton, J. S. (2016). Constraining the temperature–density relation of the intergalactic medium with the Lyman α and β forests. Monthly Notices of the Royal Astronomical Society, 456(1), L79-L83. https://doi.org/10.1093/mnrasl/slv172

The post-reionization thermal state of the intergalactic medium is characterized by a power-law relationship between temperature and density, with a slope determined by the parameter γ. We describe a new method to measure γ using the ratio of flux cu... Read More about Constraining the temperature–density relation of the intergalactic medium with the Lyman α and β forests.

Reionisation and High-Redshift Galaxies: The View from Quasar Absorption Lines (2015)
Journal Article
Becker, G. D., Bolton, J. S., & Lidz, A. (2015). Reionisation and High-Redshift Galaxies: The View from Quasar Absorption Lines. Publications of the Astronomical Society of Australia, 32, Article e045. https://doi.org/10.1017/pasa.2015.45

Determining when and how the first galaxies reionised the intergalactic medium promises to shed light on both the nature of the first objects and the cosmic history of baryons. Towards this goal, quasar absorption lines play a unique role by probing... Read More about Reionisation and High-Redshift Galaxies: The View from Quasar Absorption Lines.