%0 Generic %1 huang2022measure %A Huang, L. %A Wang, H. %A Gao, Z. F. %A Zeng, X. Y. %A Chang, Z. Y. %D 2022 %K library %T A measure of cosmological distance using the \civ\ Baldwin effect in quasars %U http://arxiv.org/abs/2207.09456 %X We use the anticorrelation between the equivalent width (EW) of the C\,iv 1549 \AA emission line and the continuum luminosity in the quasars rest frame (Baldwin effect) to measure their luminosity distance as well as estimate cosmological parameters. We obtain a sample of 291 Type I quasars with the UV/optical spectra and EW (C\,iv) measurements in the redshift range of $1.506 z 4.72$, which can be used to investigate the C\,iv Baldwin effect and determine cosmological luminosity distance. The relation $EW(C\,iv) (L_)^$ can be applied to check the inverse correlation between the C\,iv EW and $L_$ of quasars and give their distance. The data suggest that the EW of C\,iv is inversely correlated with continuum monochromatic luminosities. On the other hand, we also consider dividing the Type I quasars sample into various redshift bins, which can be used to check if the C\,iv EW-luminosity relation depends on the redshift. Finally, we apply a combination of Type I quasars and SNIa Pantheon to test the property of dark energy concerning whether or not its density deviates from the constant, and give the statistical results.

@misc{huang2022measure, abstract = {We use the anticorrelation between the equivalent width (EW) of the C\,\textsc{iv} 1549 {\AA} emission line and the continuum luminosity in the quasars rest frame (Baldwin effect) to measure their luminosity distance as well as estimate cosmological parameters. We obtain a sample of 291 Type I quasars with the UV/optical spectra and EW (C\,\textsc{iv}) measurements in the redshift range of $1.506 \le z \le 4.72$, which can be used to investigate the C\,\textsc{iv} Baldwin effect and determine cosmological luminosity distance. The relation $EW(C\,\textsc{iv}) \propto {(\lambda {L_\lambda })^\gamma }$ can be applied to check the inverse correlation between the C\,\textsc{iv} EW and ${L_\lambda }$ of quasars and give their distance. The data suggest that the EW of C\,\textsc{iv} is inversely correlated with continuum monochromatic luminosities. On the other hand, we also consider dividing the Type I quasars sample into various redshift bins, which can be used to check if the C\,\textsc{iv} EW-luminosity relation depends on the redshift. Finally, we apply a combination of Type I quasars and SNIa Pantheon to test the property of dark energy concerning whether or not its density deviates from the constant, and give the statistical results.}, added-at = {2022-07-21T12:48:04.000+0200}, author = {Huang, L. and Wang, H. and Gao, Z. F. and Zeng, X. Y. and Chang, Z. Y.}, biburl = {https://www.bibsonomy.org/bibtex/25c5bba5c3536ba6fa5dfe85dba22a2d0/gpkulkarni}, description = {A measure of cosmological distance using the \civ\ Baldwin effect in quasars}, interhash = {352487d2aacafc44ccc9ac2416c6b5dc}, intrahash = {5c5bba5c3536ba6fa5dfe85dba22a2d0}, keywords = {library}, note = {cite arxiv:2207.09456Comment: arXiv admin note: text overlap with arXiv:2207.08390}, timestamp = {2022-07-21T12:48:04.000+0200}, title = {A measure of cosmological distance using the \civ\ Baldwin effect in quasars}, url = {http://arxiv.org/abs/2207.09456}, year = 2022 }