{"title":"Testing the Consistency of Unified Scheme of Seyfert Galaxies","authors":"E. U. Iyida, Innocent Okwudili Eya, C. I. Eze","doi":"10.5140/jass.2022.39.2.43","DOIUrl":null,"url":null,"abstract":"The unified scheme of Seyfert galaxies hypothesizes that the observed differences\n between the two categories of Seyfert galaxies, type 1 (Sy1) and type 2 (Sy2) are merely\n due to the difference in the orientation of the toroidal shape of the obscuring material\n in the active galactic nuclei. We used in this paper, a sample consisting of 120 Seyfert\n galaxies at 1.40 × 109 Hz in radio, 2.52 × 1017 Hz in X-ray and 2.52 × 1023 Hz in γ-ray\n luminosities observed by the Fermi Large Area Telescope (Fermi- LAT) in order to test\n the unified scheme of radio-quiet Seyfert galaxies. Our main results are as follows: (i)\n We found that the distributions of multiwave luminosities (Lradio, LX-ray, and Lγ-ray)\n of Sy1 and Sy2 are completely overlapped with up to a factor of 4. The principal\n component analysis result reveals that Sy1 and Sy2 also occupy the same parameter\n spaces, which agrees with the notion that Sy1 and Sy2 are the same class objects. A\n Kolmogorov-Smirnov test performed on the sub-samples indicates that the null hypothesis\n (both are from the same population) cannot be rejected with chance probability p ~ 0 and\n separation distance K = 0.013. This result supports the fact that there is no\n statistical difference between the properties of Sy1 and Sy2 (ii) We found that the\n coefficient of the best-fit linear regression equation between the common properties of\n Sy1 and Sy2 is significant (r > 0.50) which plausibly implies that Sy1 and Sy2 are\n the same type of objects observed at different viewing angle.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Astronomy and Space Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5140/jass.2022.39.2.43","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The unified scheme of Seyfert galaxies hypothesizes that the observed differences
between the two categories of Seyfert galaxies, type 1 (Sy1) and type 2 (Sy2) are merely
due to the difference in the orientation of the toroidal shape of the obscuring material
in the active galactic nuclei. We used in this paper, a sample consisting of 120 Seyfert
galaxies at 1.40 × 109 Hz in radio, 2.52 × 1017 Hz in X-ray and 2.52 × 1023 Hz in γ-ray
luminosities observed by the Fermi Large Area Telescope (Fermi- LAT) in order to test
the unified scheme of radio-quiet Seyfert galaxies. Our main results are as follows: (i)
We found that the distributions of multiwave luminosities (Lradio, LX-ray, and Lγ-ray)
of Sy1 and Sy2 are completely overlapped with up to a factor of 4. The principal
component analysis result reveals that Sy1 and Sy2 also occupy the same parameter
spaces, which agrees with the notion that Sy1 and Sy2 are the same class objects. A
Kolmogorov-Smirnov test performed on the sub-samples indicates that the null hypothesis
(both are from the same population) cannot be rejected with chance probability p ~ 0 and
separation distance K = 0.013. This result supports the fact that there is no
statistical difference between the properties of Sy1 and Sy2 (ii) We found that the
coefficient of the best-fit linear regression equation between the common properties of
Sy1 and Sy2 is significant (r > 0.50) which plausibly implies that Sy1 and Sy2 are
the same type of objects observed at different viewing angle.
期刊介绍:
JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.