Search Publications
X-ray emission of the radio-loud quasar SDSS J121426.52+140258.9: independent variations between optical/UV and X-ray emission
Anjum, Muhammad S.; Liao, Mai; Gu, Minfeng +1 more
To understand the X-ray emission of active galactic nuclei (AGNs), we explored the optical-to-X-ray variation correlation of a radio-loud quasar (RLQ) SDSS J121426.52+140258.9 (hereafter J1214+1402) with multi-epoch observations by the Swift and XMM-Newton telescopes. With the historical multiband data, we found that the infrared-to-X-ray flux of …
Differences between the globular cluster systems of the Virgo and Fornax galaxy clusters
Mieske, Steffen; Dabringhausen, Jörg; Fellhauer, Michael
It is well-known that Globular cluster systems are different among galaxies. Here, we test to which degree these differences remain on the scale of galaxy clusters by comparing the globular clusters (GCs) in optical surveys of the Virgo galaxy cluster (ACSVCS) and the ACS Fornax galaxy cluster (ACSFCS) in Kolmogorov-Smirnoff Tests. Both surveys we…
Apsidal motion and absolute parameters of GV Nor and V881 Sco based on mid-resolution spectroscopy and TESS photometry
Erdem, Ahmet; Sürgit, Derya; Engelbrecht, Chris A. +5 more
The veracity of stellar evolution models and theoretical internal structure constants may be subjected to stringent tests by using physical parameters obtained from spectroscopic and photometric observations of eclipsing binary systems that exhibit apsidal motion. Two eclipsing binary stars from the southern hemisphere with no prior published spec…
Supermassive black holes in a mass-limited galaxy sample
Drinkwater, Michael J.; Côté, Patrick; Ferrarese, Laura +8 more
The observed scaling relations between supermassive black hole masses and their host galaxy properties indicate that supermassive black holes influence the evolution of galaxies. However, the scaling relations may be affected by selection biases. We propose to measure black hole masses in a mass-limited galaxy sample including all non-detections t…
A statistical study of trans-equatorial loops from 2006 to 2020
Pevtsov, Alexei A.; Xue, Zhike; Su, Jiangtao +5 more
We studied trans-equatorial loops (TLs) statistically from December 2006 to 2020. During this period, 160 TLs were identified, and 12 per cent of all active regions are connected by TLs. The result shows that 74 per cent of TLs are connected to regions of preceding magnetic polarity (PTLs), and only 26 per cent of TLs are connected to regions of f…
A photodissociation region (PDR) model grid in planetary nebula paradigm: dependency of C and O fine structure line emission and PDR thermal structure on central star radiation and nebular dust composition
Das, Ramkrishna; Bandyopadhyay, Rahul
We compute a grid of photodissociation region (PDR) models. The varying parameters of the grid include effective temperature (Teff) and luminosity (L) of the radiation source, density (nH) of the nebula, PDR depth from the nebular ionization front (ΔrPDR), and densities of polycyclic aromatic hydrocarbon (PAH) mole…
Variation of temperature and non-thermal velocity with height in fan loops
Tripathi, Durgesh; Sharma, Aishawnnya
We study the variation of temperature and non-thermal velocity with height in fan loops. For this purpose, we have used the observations recorded by the Extreme Ultraviolet Imaging Spectrometer onboard Hinode. We have employed the emission measure (EM)-loci method to estimate the temperatures of different coronal fan loops and then compute the non…