Extent and structure of intervening absorbers from absorption lines redshifted on quasar emission lines. Bergeron, J. & Boisse, P. ArXiv e-prints, 1705:arXiv:1705.05131, May, 2017. ![Extent and structure of intervening absorbers from absorption lines redshifted on quasar emission lines [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex We wish to study the extent and subparsec scale spatial structure of intervening quasar absorbers, mainly those involving neutral and molecular gas. We have selected quasar absorption systems with high spectral resolution and good S/N data, with some of their lines falling on quasar emission features. By investigating the consistency of absorption profiles seen for lines formed either against the quasar continuum source or on the much more extended emission line region (ELR), we can probe the extent and structure of the foreground absorber over the extent of the ELR (0.3-1 pc). The spatial covering analysis provides constraints on the transverse size of the absorber and thus is complementary to variability or photoionisation modelling studies. The methods we used to identify spatial covering or structure effects involve line profile fitting and curve of growth analysis.We have detected three absorbers with unambiguous non uniformity effects in neutral gas. For one extreme case, the FeI absorber at z_abs=0.45206 towards HE 0001-2340, we derive a coverage factor of the ELR of at most 0.10 and possibly very close to zero; this implies an absorber overall size no larger than 0.06 pc. For the z_abs=2.41837 CI absorber towards QSO J1439+1117, absorption is significantly stronger towards the ELR than towards the continuum source in several CI and CI* velocity components pointing to factors of about two spatial variations of their column densities and the presence of structures at the 100 au - 0.1 pc scale. The other systems with firm or possible effects can be described in terms of partial covering of the ELR, with coverage factors in the range 0.7 - 1. The overall results for cold, neutral absorbers imply a transverse extent of about five times or less the ELR size, which is consistent with other known constraints.
@article{bergeron_extent_2017,
title = {Extent and structure of intervening absorbers from absorption lines redshifted on quasar emission lines},
volume = {1705},
url = {http://adsabs.harvard.edu/abs/2017arXiv170505131B},
abstract = {We wish to study the extent and subparsec scale spatial structure of
intervening quasar absorbers, mainly those involving neutral and
molecular gas. We have selected quasar absorption systems with high
spectral resolution and good S/N data, with some of their lines falling
on quasar emission features. By investigating the consistency of
absorption profiles seen for lines formed either against the quasar
continuum source or on the much more extended emission line region
(ELR), we can probe the extent and structure of the foreground absorber
over the extent of the ELR (0.3-1 pc). The spatial covering analysis
provides constraints on the transverse size of the absorber and thus is
complementary to variability or photoionisation modelling studies. The
methods we used to identify spatial covering or structure effects
involve line profile fitting and curve of growth analysis.We have
detected three absorbers with unambiguous non uniformity effects in
neutral gas. For one extreme case, the FeI absorber at z\_abs=0.45206
towards HE 0001-2340, we derive a coverage factor of the ELR of at most
0.10 and possibly very close to zero; this implies an absorber overall
size no larger than 0.06 pc. For the z\_abs=2.41837 CI absorber towards
QSO J1439+1117, absorption is significantly stronger towards the ELR
than towards the continuum source in several CI and CI* velocity
components pointing to factors of about two spatial variations of their
column densities and the presence of structures at the 100 au - 0.1 pc
scale. The other systems with firm or possible effects can be described
in terms of partial covering of the ELR, with coverage factors in the
range 0.7 - 1. The overall results for cold, neutral absorbers imply a
transverse extent of about five times or less the ELR size, which is
consistent with other known constraints.},
urldate = {2017-05-18},
journal = {ArXiv e-prints},
author = {Bergeron, Jacqueline and Boisse, Patrick},
month = may,
year = {2017},
keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
pages = {arXiv:1705.05131},
}
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By investigating the consistency of absorption profiles seen for lines formed either against the quasar continuum source or on the much more extended emission line region (ELR), we can probe the extent and structure of the foreground absorber over the extent of the ELR (0.3-1 pc). The spatial covering analysis provides constraints on the transverse size of the absorber and thus is complementary to variability or photoionisation modelling studies. The methods we used to identify spatial covering or structure effects involve line profile fitting and curve of growth analysis.We have detected three absorbers with unambiguous non uniformity effects in neutral gas. For one extreme case, the FeI absorber at z_abs=0.45206 towards HE 0001-2340, we derive a coverage factor of the ELR of at most 0.10 and possibly very close to zero; this implies an absorber overall size no larger than 0.06 pc. For the z_abs=2.41837 CI absorber towards QSO J1439+1117, absorption is significantly stronger towards the ELR than towards the continuum source in several CI and CI* velocity components pointing to factors of about two spatial variations of their column densities and the presence of structures at the 100 au - 0.1 pc scale. The other systems with firm or possible effects can be described in terms of partial covering of the ELR, with coverage factors in the range 0.7 - 1. The overall results for cold, neutral absorbers imply a transverse extent of about five times or less the ELR size, which is consistent with other known constraints.","urldate":"2017-05-18","journal":"ArXiv e-prints","author":[{"propositions":[],"lastnames":["Bergeron"],"firstnames":["Jacqueline"],"suffixes":[]},{"propositions":[],"lastnames":["Boisse"],"firstnames":["Patrick"],"suffixes":[]}],"month":"May","year":"2017","keywords":"Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics","pages":"arXiv:1705.05131","bibtex":"@article{bergeron_extent_2017,\n\ttitle = {Extent and structure of intervening absorbers from absorption lines redshifted on quasar emission lines},\n\tvolume = {1705},\n\turl = {http://adsabs.harvard.edu/abs/2017arXiv170505131B},\n\tabstract = {We wish to study the extent and subparsec scale spatial structure of \nintervening quasar absorbers, mainly those involving neutral and\nmolecular gas. We have selected quasar absorption systems with high\nspectral resolution and good S/N data, with some of their lines falling\non quasar emission features. By investigating the consistency of\nabsorption profiles seen for lines formed either against the quasar\ncontinuum source or on the much more extended emission line region\n(ELR), we can probe the extent and structure of the foreground absorber\nover the extent of the ELR (0.3-1 pc). The spatial covering analysis\nprovides constraints on the transverse size of the absorber and thus is\ncomplementary to variability or photoionisation modelling studies. The\nmethods we used to identify spatial covering or structure effects\ninvolve line profile fitting and curve of growth analysis.We have\ndetected three absorbers with unambiguous non uniformity effects in\nneutral gas. For one extreme case, the FeI absorber at z\\_abs=0.45206\ntowards HE 0001-2340, we derive a coverage factor of the ELR of at most\n0.10 and possibly very close to zero; this implies an absorber overall\nsize no larger than 0.06 pc. For the z\\_abs=2.41837 CI absorber towards\nQSO J1439+1117, absorption is significantly stronger towards the ELR\nthan towards the continuum source in several CI and CI* velocity\ncomponents pointing to factors of about two spatial variations of their\ncolumn densities and the presence of structures at the 100 au - 0.1 pc\nscale. The other systems with firm or possible effects can be described\nin terms of partial covering of the ELR, with coverage factors in the\nrange 0.7 - 1. The overall results for cold, neutral absorbers imply a\ntransverse extent of about five times or less the ELR size, which is\nconsistent with other known constraints.},\n\turldate = {2017-05-18},\n\tjournal = {ArXiv e-prints},\n\tauthor = {Bergeron, Jacqueline and Boisse, Patrick},\n\tmonth = may,\n\tyear = {2017},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},\n\tpages = {arXiv:1705.05131},\n}\n\n","author_short":["Bergeron, J.","Boisse, P."],"key":"bergeron_extent_2017","id":"bergeron_extent_2017","bibbaseid":"bergeron-boisse-extentandstructureofinterveningabsorbersfromabsorptionlinesredshiftedonquasaremissionlines-2017","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2017arXiv170505131B"},"keyword":["Astrophysics - Astrophysics of Galaxies","Astrophysics - Cosmology and Nongalactic Astrophysics"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies","astrophysics - cosmology and nongalactic astrophysics"],"search_terms":["extent","structure","intervening","absorbers","absorption","lines","redshifted","quasar","emission","lines","bergeron","boisse"],"title":"Extent and structure of intervening absorbers from absorption lines redshifted on quasar emission lines","year":2017}