1,723,597 research outputs found
HII regions in NGC 6814
No full textVizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'Statistics and properties of HII regions in NGC 6814' (bibcode: 1993AJ....106...56K
Analysis of the warm absorber in NGC 6814
Get PDF1 online resource (vii, 47 pages) : colour illustrations, colour charts, colour graphsIncludes abstract.Includes bibliographical references (pages 46-47).NGC 6814, a Seyfert 1.5 Active Galactic Nucleus (AGN) at redshift z = 0.00522, is a compelling object to study due to its high X-ray variability and the presence of photoionized gas outflows. In 2016, a rapid occultation event, indicative of the presence of a highly ionized absorbing gas, was detected in NGC 6814, presenting a unique opportunity to investigate the properties, size, and location of the eclipsing gas. The primary objective of this work is to probe the warm absorber in NGC 6814 using high-resolution spectra from 2021, comparing the properties of the warm absorber with those from the obscuring gas observed in 2016. This analysis aims to unveil insights into the origin of the eclipsing gas and provide further details on the properties and kinematics of the central region of NGC 6814. This work reveals that two warm absorbing models with similar velocities but varying ionisations and densities are statistically required to fit the absorption features in the spectrum, with some features remaining unfitted. A picture can be drawn of the warm absorption system in NGC 6814, where both warm absorbing clouds are a part of the same medium moving outwards at a velocity of ≈ 2500 km s−1, or that the two warm absorbers are describing an ionisation and density gradient within the same cloud
Geochemistry of sediment core IKU-6814/04-U-02
No full textGeochemistry of sediment core IKU-6814/04-U-0
Renal hücreli karsinomda bir heparanaz varyantı olan T5 oluşumunda miR-6814-5p'nin rolü
No full textPurpose: The aim of this study is to investigate whether the overexpression of human heparanase protein (HPSE) alternative variant protein called T5 is caused by increased expression of miR-6814-5p in human renal cell carcinoma (RCC) cases. In addition, the possible correlation between the clinical parameters of RCC cases and the expression levels of T5 and miR-6814-5p was evaluated
Entrance channel effects in the reaction of aligned Ca(1 P) with HCl
Get PDFContains fulltext :
6814.pdf (Publisher’s version ) (Open Access)doi:10.1021/jp9711609doi:10.1021/jp971160
An x-ray timing analysis of NGC 6814
Get PDF1 online resource (vii, 42 pages) : charts (some colour), graphs (some colour)Includes abstract.Includes bibliographical references (pages 40-42).We perform an X-ray timing analysis of the type 1.5 Seyfert galaxy NGC 6814 to
characterise its variability as a means of understanding the structure and properties
of its active galactic nucleus (AGN). Using data from five observations by the XMMNewton and NuSTAR observatories, we employ a number of X-ray timing analysis techniques to investigate the relationships between the different components of the AGN. We find that variability in NGC 6814 during the 2016 eclipse was dominated by changes in the absorption, and that at all other epochs behaviour was similar to that of normal AGN. Our analysis of hardness ratio against flux confirms that NGC 6814 follows the “softer when brighter” trend observed in other AGN, and, from the fractional variabilities, the amplitude of these variations is found to decrease with increasing energy. No significant frequency or energy dependent lags are detected in any of the observations, indicating that the inner-disc blurred reflection component is quite weak in this source. We discuss the implications of these findings and how they support previous works that suggest a compact source of high-energy X-rays and the possibility of a non-standard accretion disc
- …
