Zobrazeno 1 - 10
of 45
pro vyhledávání: '"R L Porter"'
Autor:
Gary J. Ferland, Jeremy S. Sanders, R. L. Porter, P. A. M. van Hoof, Marios Chatzikos, R. J. R. Williams, Matt L. Lykins, Rebecca E. A. Canning, A. C. Fabian, R. M. Johnstone
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 446:1234-1244
We announce a new facility in the spectral code CLOUDY that enables tracking the evolution of a cooling parcel of gas with time. For gas cooling from temperatures relevant to galaxy clusters, earlier calculations estimated the [Fe XIV] {\lambda}5303
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50e5f98e940c2434944e17f46a8998c4
https://doi.org/10.1093/mnras/stu2173
https://doi.org/10.1093/mnras/stu2173
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 440:3100-3112
This work follows Lykins et al. discussion of classic plasma cooling function at low density and solar metallicity. Here we focus on how the cooling function changes over a wide range of density (n_H
Published by MNRAS, online tables can be foun
Published by MNRAS, online tables can be foun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3dfb6c860aba5abb4f0cad45b09aa2b
https://doi.org/10.1093/mnras/stu514
https://doi.org/10.1093/mnras/stu514
Autor:
Peter A. M. van Hoof, R. J. R. Williams, Matt L. Lykins, Orly Gnat, Gary J. Ferland, R. L. Porter
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 429:3133-3143
We discuss recent improvements in the calculation of the radiative cooling in both collisionally and photo ionized plasmas. We are extending the spectral simulation code Cloudy so that as much as possible of the underlying atomic data is taken from e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a75bafc7857332ac5f762d8d59950bbe
https://doi.org/10.1093/mnras/sts570
https://doi.org/10.1093/mnras/sts570
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters. 425:L28-L31
We update our prior work on the case B collisional-recombination spectrum of He I to incorporate ab initio photoionization cross-sections. This large set of accurate, self-consistent cross-sections represents a significant improvement in He I emissiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3574db4873c8a2d27eb055e9980e5f4b
https://doi.org/10.1111/j.1745-3933.2012.01300.x
https://doi.org/10.1111/j.1745-3933.2012.01300.x
Publikováno v:
The Astrophysical Journal. 867:152
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6512aee55b428f06001082f609d95e34
https://doi.org/10.3847/1538-4357/aae4e3
https://doi.org/10.3847/1538-4357/aae4e3
Autor:
R. L. Porter
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters. 407:L59-L63
We consider an accretion-disc origin for the broad and luminous forbidden-line emission observed in ultraluminous X-ray (ULX) sources CXOJ033831.8-352604 and XMMU 122939.7+075333 in globular clusters hosted by elliptical galaxies NGC 1399 and NGC 447
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e113f78dfbcb92ea60400a9fadf1d388
https://doi.org/10.1111/j.1745-3933.2010.00904.x
https://doi.org/10.1111/j.1745-3933.2010.00904.x
Autor:
Manuel Peimbert, Gary J. Ferland, R. L. Porter, Antonio Peimbert, Yuri Izotov, Evan D. Skillman, Gary Steigman
Publikováno v:
Proceedings of the International Astronomical Union. 5:163-167
Here we summarize the discussion that took place after the presentation of papers discussing measurement of abundances from emission lines in H II regions. A cosmological test using 4He is harder than those using the other light elements due to the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09b1c651e86150361b4d58c63b9a00b4
https://doi.org/10.1017/s1743921310004011
https://doi.org/10.1017/s1743921310004011
Autor:
Gary J. Ferland, R. L. Porter
Publikováno v:
The Astrophysical Journal. 664:586-595
A complete model of helium-like line and continuum emission has been incorporated into the plasma simulation code Cloudy. All elements between He and Zn are treated, any number of levels can be considered, and radiative and collisional processes are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aae4633172f69b0f7e2702932dacb0c6
https://doi.org/10.1086/518882
https://doi.org/10.1086/518882
Autor:
Gary J. Ferland, Marios Chatzikos, Kevin Volk, R. J. R. Williams, Matt L. Lykins, R. L. Porter, P. A. M. van Hoof, Ye Wang
When modelling an ionised plasma, all spectral synthesis codes need the thermally averaged free-free Gaunt factor defined over a very wide range of parameter space in order to produce an accurate prediction for the spectrum. Until now no data set exi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b02a775f973cdd06a00b5de4a9f3fb51
http://arxiv.org/abs/1502.06788
http://arxiv.org/abs/1502.06788
Autor:
Gary J. Ferland, B. K. Armentrout, T. J. Turner, Keith A. Arnaud, Steven B. Kraemer, R. L. Porter
Publikováno v:
Publications of the Astronomical Society of the Pacific. 118:920-923
We discuss new functionality of the spectral simulation code CLOUDY which allows the user to calculate grids with one or more initial parameters varied and formats the predicted spectra in the standard FITS format. These files can then be imported in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea40216d2d932cc2e11feab3329c61a8
https://doi.org/10.1086/506333
https://doi.org/10.1086/506333