Zobrazeno 1 - 10
of 212
pro vyhledávání: '"Sutherland, Ralph S."'
We present $[OIII]/H_{\rm \beta}$ emision line flux ratio predictions for galaxies at $z \sim 7-9$ using the MAPPINGS V v5.2.0 photoionization modelling code combined with an analytic galaxy formation model. Properties such as pressure and ionization
Externí odkaz:
http://arxiv.org/abs/2410.23606
Autor:
Li, Song-Lin, Grasha, Kathryn, Krumholz, Mark R., Wisnioski, Emily, Sutherland, Ralph S., Kewley, Lisa J., Chen, Yan-Mei, Li, Zefeng
Galaxies' stellar masses, gas-phase oxygen abundances (metallicity), and star formation rates (SFRs) obey a series of empirical correlations, most notably the mass-metallicity relation (MZR) and fundamental metallicity relation (FZR), which relates o
Externí odkaz:
http://arxiv.org/abs/2403.16069
The photoionization model of narrow-line regions (NLRs) in active galactic nuclei (AGNs) has been investigated for decades. Many published models are restricted to simple linear scaling abundance relations, dust-free assumption, uniform AGN radiation
Externí odkaz:
http://arxiv.org/abs/2305.12670
Autor:
Roy, Arpita, Krumholz, Mark R., Dopita, Michael A., Sutherland, Ralph S., Kewley, Lisa J., Heger, Alexander
Publikováno v:
Proceedings of the International Astronomical Union, 16(S366), 33-38, 2022
Understanding the nucleosynthetic origin of nitrogen and the evolution of the N/O ratio in the interstellar medium is crucial for a comprehensive picture of galaxy chemical evolution at high-redshift because most observational metallicity (O/H) estim
Externí odkaz:
http://arxiv.org/abs/2212.05103
We create a photoionization model embedded in the turbulent ISM by using the state-of-the-art Messenger Monte-Carlo MAPPINGS~V code (M$^3$) in conjunction with the CMFGEN stellar atmosphere model. We show that the turbulent ISM causes the inhomogenei
Externí odkaz:
http://arxiv.org/abs/2207.06672
Autor:
Meenakshi, Moun, Mukherjee, Dipanjan, Wagner, Alexander Y., Nesvadba, Nicole P. H., Bicknell, Geoffrey V., Morganti, Raffaella, Janssen, Reinier M. J., Sutherland, Ralph S., Mandal, Ankush
Relativistic jets are believed to have a substantial impact on the gas dynamics and evolution of the interstellar medium (ISM) of their host galaxies. In this paper, we aim to draw a link between the simulations and the observable signatures of jet-I
Externí odkaz:
http://arxiv.org/abs/2203.10251
Autor:
Roy, Arpita, Dopita, Michael A., Krumholz, Mark R., Kewley, Lisa J., Sutherland, Ralph S., Heger, Alexander
Understanding the evolution of the N/O ratio in the interstellar medium (ISM) of galaxies is essential if we are to complete our picture of the chemical evolution of galaxies at high redshift, since most observational calibrations of O/H implicitly d
Externí odkaz:
http://arxiv.org/abs/2005.03038
Publikováno v:
2019ARA&A..57..511K
We review the use of emission-lines for understanding galaxy evolution, focusing on excitation source, metallicity, ionization parameter, ISM pressure and electron density. We show that the UV, optical and infrared contain complementary diagnostics t
Externí odkaz:
http://arxiv.org/abs/1910.09730
Autor:
Kewley, Lisa J., Nicholls, David C., Sutherland, Ralph S., Rigby, Jane R., Acharyya, Ayan, Dopita, Michael A., Bayliss, Matthew B.
Publikováno v:
The Astrophysical Journal, Volume 880, Issue 1, article id. 16, 24 pp. (2019)
We derive new self-consistent theoretical UV, optical, and IR diagnostics for the ISM pressure and electron density in the ionized nebulae of star-forming galaxies. Our UV diagnostics utilize the inter-combination, forbidden and resonance lines of si
Externí odkaz:
http://arxiv.org/abs/1908.05504
The evolutionary paths taken by massive stars with $M \gtrsim 60 \, \mathrm{M}_\odot$ remain substantially uncertain. They begin their lives as main sequence (MS) O-stars. Depending on their masses, rotation rates, and metallicities, they can then en
Externí odkaz:
http://arxiv.org/abs/1907.07666