On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies

Nwankwo Ifeanyi Francis; Ogwo Jemima Ngozi

doi:doi:10.11648/j.ijass.20210904.11

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On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies

Nwankwo Ifeanyi Francis, Ogwo Jemima Ngozi

Published in International Journal of Astrophysics and Space Science (Volume 9, Issue 4)

Received: 11 December 2021 Accepted: 11 January 2022 Published: 20 January 2022

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Abstract

We present our result on the Eddington ratios and accretion rates of 13,516 Seyfert galaxies consisting of 6,758 Seyfert 1s and 6,758 Seyfert 2s. These objects under study are a sub-sample of 91,006 Seyfert galaxies from SDSS-DR14. Using the separation criterion > 3 for Seyfert 2 galaxies, the 91,006 objects are separated into Seyferts 1s and 2s and we further select Hidden broadline region (HBLR) Seyfert 2s. Our results show that Seyfert 1 galaxies have higher Eddington ratio that Seyfert 2s an indication that Seyfert 1 galaxies may be more AGN-dominated than Seyfert 2 galaxies. We find the mean luminosity of the doubly ionized oxygen line () to be higher in Seyfert 2 galaxies a pointer that narrow line regions (NLRs) in Seyfert 2s may contain higher density of cloud of particles than Seyfert 1s. In addition, () is found to increase with increasing Eddington ratio which shows that the NLR is likely to be illuminated by the central region; a precursor that the central region and the NRL should be few parsecs apart. The observation we make that Seyferts 1 and 2 of equal black hole mass (=) have diametrically unequal Eddington ratio of log=8.9638 for Seyfert 2s and log=5.801 for Seyfert 1s suggests that each of the Seyfert classes may have been associated with different AGN activities. On accretion rate, Seyfert 2 galaxies have higher accretion rate which implies that they are probably in the gravitational force era dominated by absorption by matter while Seyfert 1s are probably in the radiation force dominated era and as such not associated with absorption by matter.

Published in	International Journal of Astrophysics and Space Science (Volume 9, Issue 4)
DOI	10.11648/j.ijass.20210904.11
Page(s)	51-57
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Galaxies, Eddington Ratio, Accretion, Narrow Line Region, Brood Line Region

References

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APA Style

Nwankwo Ifeanyi Francis, Ogwo Jemima Ngozi. (2022). On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies. International Journal of Astrophysics and Space Science, 9(4), 51-57. https://doi.org/10.11648/j.ijass.20210904.11

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ACS Style

Nwankwo Ifeanyi Francis; Ogwo Jemima Ngozi. On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies. Int. J. Astrophys. Space Sci. 2022, 9(4), 51-57. doi: 10.11648/j.ijass.20210904.11

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AMA Style

Nwankwo Ifeanyi Francis, Ogwo Jemima Ngozi. On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies. Int J Astrophys Space Sci. 2022;9(4):51-57. doi: 10.11648/j.ijass.20210904.11

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@article{10.11648/j.ijass.20210904.11,
  author = {Nwankwo Ifeanyi Francis and Ogwo Jemima Ngozi},
  title = {On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies},
  journal = {International Journal of Astrophysics and Space Science},
  volume = {9},
  number = {4},
  pages = {51-57},
  doi = {10.11648/j.ijass.20210904.11},
  url = {https://doi.org/10.11648/j.ijass.20210904.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijass.20210904.11},
  abstract = {We present our result on the Eddington ratios and accretion rates of 13,516 Seyfert galaxies consisting of 6,758 Seyfert 1s and 6,758 Seyfert 2s. These objects under study are a sub-sample of 91,006 Seyfert galaxies from SDSS-DR14. Using the separation criterion > 3 for Seyfert 2 galaxies, the 91,006 objects are separated into Seyferts 1s and 2s and we further select Hidden broadline region (HBLR) Seyfert 2s. Our results show that Seyfert 1 galaxies have higher Eddington ratio that Seyfert 2s an indication that Seyfert 1 galaxies may be more AGN-dominated than Seyfert 2 galaxies. We find the mean luminosity of the doubly ionized oxygen line () to be higher in Seyfert 2 galaxies a pointer that narrow line regions (NLRs) in Seyfert 2s may contain higher density of cloud of particles than Seyfert 1s. In addition, () is found to increase with increasing Eddington ratio which shows that the NLR is likely to be illuminated by the central region; a precursor that the central region and the NRL should be few parsecs apart. The observation we make that Seyferts 1 and 2 of equal black hole mass (=) have diametrically unequal Eddington ratio of log=8.9638 for Seyfert 2s and log=5.801 for Seyfert 1s suggests that each of the Seyfert classes may have been associated with different AGN activities. On accretion rate, Seyfert 2 galaxies have higher accretion rate which implies that they are probably in the gravitational force era dominated by absorption by matter while Seyfert 1s are probably in the radiation force dominated era and as such not associated with absorption by matter.},
 year = {2022}
}

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TY  - JOUR
T1  - On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies
AU  - Nwankwo Ifeanyi Francis
AU  - Ogwo Jemima Ngozi
Y1  - 2022/01/20
PY  - 2022
N1  - https://doi.org/10.11648/j.ijass.20210904.11
DO  - 10.11648/j.ijass.20210904.11
T2  - International Journal of Astrophysics and Space Science
JF  - International Journal of Astrophysics and Space Science
JO  - International Journal of Astrophysics and Space Science
SP  - 51
EP  - 57
PB  - Science Publishing Group
SN  - 2376-7022
UR  - https://doi.org/10.11648/j.ijass.20210904.11
AB  - We present our result on the Eddington ratios and accretion rates of 13,516 Seyfert galaxies consisting of 6,758 Seyfert 1s and 6,758 Seyfert 2s. These objects under study are a sub-sample of 91,006 Seyfert galaxies from SDSS-DR14. Using the separation criterion > 3 for Seyfert 2 galaxies, the 91,006 objects are separated into Seyferts 1s and 2s and we further select Hidden broadline region (HBLR) Seyfert 2s. Our results show that Seyfert 1 galaxies have higher Eddington ratio that Seyfert 2s an indication that Seyfert 1 galaxies may be more AGN-dominated than Seyfert 2 galaxies. We find the mean luminosity of the doubly ionized oxygen line () to be higher in Seyfert 2 galaxies a pointer that narrow line regions (NLRs) in Seyfert 2s may contain higher density of cloud of particles than Seyfert 1s. In addition, () is found to increase with increasing Eddington ratio which shows that the NLR is likely to be illuminated by the central region; a precursor that the central region and the NRL should be few parsecs apart. The observation we make that Seyferts 1 and 2 of equal black hole mass (=) have diametrically unequal Eddington ratio of log=8.9638 for Seyfert 2s and log=5.801 for Seyfert 1s suggests that each of the Seyfert classes may have been associated with different AGN activities. On accretion rate, Seyfert 2 galaxies have higher accretion rate which implies that they are probably in the gravitational force era dominated by absorption by matter while Seyfert 1s are probably in the radiation force dominated era and as such not associated with absorption by matter.
VL  - 9
IS  - 4
ER  -

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Author Information

Nwankwo Ifeanyi Francis

Department of Physics, Abia State University, Uturu, Nigeria
Ogwo Jemima Ngozi

Department of Physics, Abia State University, Uturu, Nigeria

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APA Style

Nwankwo Ifeanyi Francis, Ogwo Jemima Ngozi. (2022). On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies. International Journal of Astrophysics and Space Science, 9(4), 51-57. https://doi.org/10.11648/j.ijass.20210904.11

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ACS Style

Nwankwo Ifeanyi Francis; Ogwo Jemima Ngozi. On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies. Int. J. Astrophys. Space Sci. 2022, 9(4), 51-57. doi: 10.11648/j.ijass.20210904.11

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AMA Style

Nwankwo Ifeanyi Francis, Ogwo Jemima Ngozi. On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies. Int J Astrophys Space Sci. 2022;9(4):51-57. doi: 10.11648/j.ijass.20210904.11

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@article{10.11648/j.ijass.20210904.11,
  author = {Nwankwo Ifeanyi Francis and Ogwo Jemima Ngozi},
  title = {On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies},
  journal = {International Journal of Astrophysics and Space Science},
  volume = {9},
  number = {4},
  pages = {51-57},
  doi = {10.11648/j.ijass.20210904.11},
  url = {https://doi.org/10.11648/j.ijass.20210904.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijass.20210904.11},
  abstract = {We present our result on the Eddington ratios and accretion rates of 13,516 Seyfert galaxies consisting of 6,758 Seyfert 1s and 6,758 Seyfert 2s. These objects under study are a sub-sample of 91,006 Seyfert galaxies from SDSS-DR14. Using the separation criterion > 3 for Seyfert 2 galaxies, the 91,006 objects are separated into Seyferts 1s and 2s and we further select Hidden broadline region (HBLR) Seyfert 2s. Our results show that Seyfert 1 galaxies have higher Eddington ratio that Seyfert 2s an indication that Seyfert 1 galaxies may be more AGN-dominated than Seyfert 2 galaxies. We find the mean luminosity of the doubly ionized oxygen line () to be higher in Seyfert 2 galaxies a pointer that narrow line regions (NLRs) in Seyfert 2s may contain higher density of cloud of particles than Seyfert 1s. In addition, () is found to increase with increasing Eddington ratio which shows that the NLR is likely to be illuminated by the central region; a precursor that the central region and the NRL should be few parsecs apart. The observation we make that Seyferts 1 and 2 of equal black hole mass (=) have diametrically unequal Eddington ratio of log=8.9638 for Seyfert 2s and log=5.801 for Seyfert 1s suggests that each of the Seyfert classes may have been associated with different AGN activities. On accretion rate, Seyfert 2 galaxies have higher accretion rate which implies that they are probably in the gravitational force era dominated by absorption by matter while Seyfert 1s are probably in the radiation force dominated era and as such not associated with absorption by matter.},
 year = {2022}
}

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TY  - JOUR
T1  - On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies
AU  - Nwankwo Ifeanyi Francis
AU  - Ogwo Jemima Ngozi
Y1  - 2022/01/20
PY  - 2022
N1  - https://doi.org/10.11648/j.ijass.20210904.11
DO  - 10.11648/j.ijass.20210904.11
T2  - International Journal of Astrophysics and Space Science
JF  - International Journal of Astrophysics and Space Science
JO  - International Journal of Astrophysics and Space Science
SP  - 51
EP  - 57
PB  - Science Publishing Group
SN  - 2376-7022
UR  - https://doi.org/10.11648/j.ijass.20210904.11
AB  - We present our result on the Eddington ratios and accretion rates of 13,516 Seyfert galaxies consisting of 6,758 Seyfert 1s and 6,758 Seyfert 2s. These objects under study are a sub-sample of 91,006 Seyfert galaxies from SDSS-DR14. Using the separation criterion > 3 for Seyfert 2 galaxies, the 91,006 objects are separated into Seyferts 1s and 2s and we further select Hidden broadline region (HBLR) Seyfert 2s. Our results show that Seyfert 1 galaxies have higher Eddington ratio that Seyfert 2s an indication that Seyfert 1 galaxies may be more AGN-dominated than Seyfert 2 galaxies. We find the mean luminosity of the doubly ionized oxygen line () to be higher in Seyfert 2 galaxies a pointer that narrow line regions (NLRs) in Seyfert 2s may contain higher density of cloud of particles than Seyfert 1s. In addition, () is found to increase with increasing Eddington ratio which shows that the NLR is likely to be illuminated by the central region; a precursor that the central region and the NRL should be few parsecs apart. The observation we make that Seyferts 1 and 2 of equal black hole mass (=) have diametrically unequal Eddington ratio of log=8.9638 for Seyfert 2s and log=5.801 for Seyfert 1s suggests that each of the Seyfert classes may have been associated with different AGN activities. On accretion rate, Seyfert 2 galaxies have higher accretion rate which implies that they are probably in the gravitational force era dominated by absorption by matter while Seyfert 1s are probably in the radiation force dominated era and as such not associated with absorption by matter.
VL  - 9
IS  - 4
ER  -

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