Deep Learning Voigt Profiles. I. Single-Cloud Doublets

Autor: Bryson Stemock, Christopher W. Churchill, Avery Lee, Sultan Hassan, Caitlin Doughty, Rogelio Ochoa

Publikováno v: The Astronomical Journal, Vol 167, Iss 6, p 287 (2024)

Voigt profile (VP) decomposition of quasar absorption lines is key to studying intergalactic gas and the baryon cycle governing the formation and evolution of galaxies. The VP velocities, column densities, and Doppler b parameters inform us of the ki

Externí odkaz: https://doaj.org/article/cd614759871a42eb889e43a35d7a9b89

Cloud-by-cloud, multiphase, Bayesian modelling: application to four weak, low-ionization absorbers

Autor: Christopher W. Churchill, Philipp Richter, Sowgat Muzahid, Jane C. Charlton, Jackson M. Norris, Sameer, Anand Narayanan, Bart P. Wakker, Matthew Gebhardt, Nikole M. Nielsen, Glenn G. Kacprzak

Publikováno v: Monthly Notices of the Royal Astronomical Society. 501:2112-2139

We present a new method aimed at improving the efficiency of component by component ionization modeling of intervening quasar absorption line systems. We carry out cloud-by-cloud, multiphase modeling making use of CLOUDY and Bayesian methods to extra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29b5f2c7423802e2329fd33494008bbd
https://doi.org/10.1093/mnras/staa3754

Testing galaxy formation simulations with damped Lyman-α abundance and metallicity evolution

Autor: Romeel Davé, J. Xavier Prochaska, Christopher W. Churchill, Kristian Finlator, Sultan Hassan

Publikováno v: Hassan, S, Finlator, K, Davé, R, Churchill, C W & Prochaska, J X 2020, ' Testing galaxy formation simulations with damped Lyman-α abundance and metallicity evolution ', Monthly Notices of the Royal Astronomical Society, vol. 492, no. 2, pp. 2835-2846 . https://doi.org/10.1093/mnras/staa056
Hassan, S, Finlator, K, Dave, R, Churchill, C W & Prochaska, J X 2020, ' Testing galaxy formation simulations with damped Lyman-alpha abundance and metallicity evolution ', Monthly Notices of the Royal Astronomical Society, vol. 492, no. 2, pp. 2835-2846 . https://doi.org/10.1093/mnras/staa056

We examine the properties of damped Lyman-$\alpha$ absorbers (DLAs) emerging from a single set of cosmological initial conditions in two state-of-the-art cosmological hydrodynamic simulations: {\sc Simba} and {\sc Technicolor Dawn}. The former includ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d93e71ba800c14cc65022af7772d97e
https://doi.org/10.1093/mnras/staa056

Discovery of extremely low-metallicity circumgalactic gas at $z = 0.5$ toward Q0454-220

Autor: Christopher W. Churchill, Jackson M. Norris, Sowgat Muzahid, Glenn G. Kacprzak, Jane C. Charlton, Bart P. Wakker

We have obtained new observations of the absorption system at $z_\mathrm{abs}=0.48$ toward QSO Q0454-220, which we use to constrain its chemical and physical conditions. The system features metal-enriched gas and previously unknown low-metallicity ga

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d54b62d0167888fa74a3f2c4b613b4f

Solar Wind Model Supported by Parker Solar Probe Observations During Faint Venusian Auroral Emission

Autor: Sarah A. Kovac, Candace Gray, C. Nick Arge, Nancy Chanover, Christopher W. Churchill, Adam Szabo, Matthew E. Hill, James McAteer

Publikováno v: The Astrophysical Journal. 929:45

The encounter of the Parker Solar Probe (PSP) with Venus during the Venus Gravity Assist 3 on 2020 July 11 provided a unique opportunity to gather in situ solar wind data in the Venusian environment while also being able to observe Venus from ground-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1fb90206ca06267396af291a55ec6262
https://doi.org/10.3847/1538-4357/ac58f4