Zobrazeno 1 - 10
of 477
pro vyhledávání: '"Wildy, P."'
The nucleus of the active galaxy NGC 5548 was the target of two intensive spectroscopic monitoring campaigns at X-ray, ultraviolet (UV), and optical frequencies in 2013/14. These campaigns detected the presence of a massive obscuration event. In 2016
Externí odkaz:
http://arxiv.org/abs/2010.10902
Autor:
Edidiong Nnamso Akang, Chinyerum Sylvia Opuwari, Swesme Enyioma-Alozie, Lionel Wildy Moungala, Tamarapreye Emmanuel Amatu, Ibrahim Wada, Rose Ogeyi Ogbeche, Oluwatoyin Omolayo Ajayi, Mojisola Modupe Aderonmu, Olaitan Boluwatife Shote, Lateef Adekunle Akinola, Oladapo Adenrele Ashiru, Ralf Henkel
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-8 (2023)
Abstract There are conflicting reports on trends of semen parameters from different parts of the globe. However, in recent times there is dearth of information on the trend in Sub-Saharan countries. Therefore, in this study we aimed at determining th
Externí odkaz:
https://doaj.org/article/45784409357a4f4b81454cb7361ec6f9
A quasar main sequence is widely believed to reveal itself through objects represented in a plane spanned by two parameters: the full-width at half-maximum (FWHM) of H$\beta{}$, and the ratio of Fe II to H$\beta{}$ equivalent width. This sequence is
Externí odkaz:
http://arxiv.org/abs/1908.04990
Context: Giant radio galaxies (with projected linear size of radio structure larger than 0.7 Mpc) are very rare and unusual objects. Only $\sim$5% of extended radio sources reach such sizes. Understanding of the processes responsible for their large
Externí odkaz:
http://arxiv.org/abs/1903.08724
Autor:
Czerny, Bozena, Wang, Jian-Min, Du, Pu, Hryniewicz, Krzysztof, Karas, Vladimir, Li, Yan-Rong, Panda, Swayamtrupta, Sniegowska, Marzena, Wildy, Conor, Yuan, Ye-Fei
Most results of the reverberation monitoring of active galaxies showed a universal scaling of the time delay of the Hbeta emission region with the monochromatic flux at 5100 A, with very small dipersion. Such a scaling favored the dust-based formatio
Externí odkaz:
http://arxiv.org/abs/1811.09559
Autor:
Panda, Swayamtrupta, Czerny, Bożena, Adhikari, Tek P., Hryniewicz, Krzysztof, Wildy, Conor, Kuraszkiewicz, Joanna, Śniegowska, Marzena
The concept of the quasar main sequence is very attractive since it stresses correlations between various parameters and implies the underlying simplicity. In the optical plane defined by the width of the H\{beta} line and the ratio of the equivalent
Externí odkaz:
http://arxiv.org/abs/1806.08571
We investigate the relationships between Mg ii {\lambda}2798 emission line properties, as well as between these properties and inclination angle and Fe ii strength, in a lobe-dominated quasar sample. We find no correlation between Mg ii line width an
Externí odkaz:
http://arxiv.org/abs/1805.06263
Eigenvector 1 (EV1) was found to be the dominant component behind the significant correlations for the measured parameters in quasar spectra (Boroson & Green, 1992). The parameter R$_{\mathrm{FeII}}$, which strongly correlates to the EV1, is the ${\m
Externí odkaz:
http://arxiv.org/abs/1801.00330
Quasars are among the most luminous sources characterized by their broad band spectra ranging from radio through optical to X-ray band, with numerous emission and absorption features. Using the Principal Component Analysis (PCA), Boroson & Green (199
Externí odkaz:
http://arxiv.org/abs/1712.05176
Autor:
Wildy, Conor, Czerny, Bozena
Publikováno v:
Front. Astron. Space Sci. 4:43 (2017)
Several observed spectral properties of quasars are believed to be influenced by quasar orientation. In this investigation we examine the effect of orientation on the Mg II line located at 2798 {\AA} in a sample of 36 radio-loud quasars, with orienta
Externí odkaz:
http://arxiv.org/abs/1711.08926