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Browsing Theses & Dissertations by Author "Gallo, Luigi C."
Now showing items 1-19 of 19
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(Halifax, N.S. : Saint Mary's University, 2024-04-22)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 ...
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(Halifax, N.S. : Saint Mary's University, 2023-04-17)The X-ray spectra of active galactic nuclei (AGN) contain many spectral features, such as emission lines, that provide much insight into the inner workings of these objects. In a class of AGN known as Narrow-Line Seyfert ...
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(Halifax, N.S. : Saint Mary's University, 2017)The field of high-energy AGN astrophysics is about to be transformed as data of unprecedented quality and quantity will be arriving from the next-generation of X-ray observatories. With the advancement of technology, we ...
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(Halifax, N.S. : Saint Mary's University, 2013)This work presents a deep analysis of HE 0436-4717: a “bare” Seyfert 1 galaxy with strong variability and moderate soft excess. Data included a 200 ks observation with XMM-Newton EPIC instruments, a Swift BAT detection up ...
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(Halifax, N.S. : Saint Mary's University, 2011)The XMM-Newton Observatory has conducted many observations of the type I active galactic nucleus 1H0707-495. The 0.7 deg [superscript 2] field of view around the AGN was observed over the course of ∼10 years with a total ...
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(Halifax, N.S. : Saint Mary's University, 2017)The differences in emissivity profiles produced by various corona geometries are explored via general relativistic ray tracing simulations in order to better understand the inner disc region of active galactic nuclei. ...
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(Halifax, N.S. : Saint Mary's University, 2017)Markarian 335, a Narrow-Line Seyfert 1 Galaxy, has been one the brightest X-ray sources in the sky until 2007 when its flux dropped to 1/10th of its previous value. Despite this dramatic decrease, Mrk 335 still remains one ...
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(Halifax, N.S. : Saint Mary's University, 2019)X-ray observations of two Seyfert AGN were analysed in an effort to characterise the nature of their variability. A spectral analysis was performed on a Suzaku observation of the Seyfert 1.5 AGN Mrk 530, and a timing ...
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(Halifax, N.S. : Saint Mary's University, 2020)The multi-epoch data involving 27 observations of the blazar 3C273 obtained over a period of 16 years from June 2000 to June 2016 in the 0.3-10 keV x-ray band is analysed. A single power-law model is fitted to the hard ...
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(Halifax, N.S. : Saint Mary's University, 2013)Ultraluminous Infrared Galaxies (ULIRGs) are one of the brightest sources of infrared radiation in the Universe, with luminosities upwards of 10 [superscript 12] times that of the Sun. To produce the extreme infrared ...
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(Halifax, N.S. : Saint Mary’s University, 2018)Principal Component Analysis (PCA) is applied to a variety of blazars to examine X-ray spectral variability. Data from nine different objects are analysed in two ways: long-term, which examines variability trends across ...
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(Halifax, N.S. : Saint Mary's University, 2021)High-velocity outflows in active galactic nuclei usually manifest as either a collimated jet or diffuse wind. These outflows carry a significant amount of energy from the central environment surrounding the supermassive ...
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(Halifax, N.S. : Saint Mary's University, 2021)Five jetted sources are used in this work to probe the relationship between the X-ray and Radio emission from radio-loud active galactic nuclei. Timing techniques probing variability, light curve correlation, and power ...
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(Halifax, N.S. : Saint Mary's University, 2013)A search for relativistically blurred Fe-L [alpha] is performed on 353 nearby broad and narrow line Type-1 active galactic nuclei (AGN). Simple phenomenological modeling is applied to establish the presence of Fe-L[alpha] ...
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(Halifax, N.S. : Saint Mary's University, 2023-08-01)In this work, we examine the application of the wavelet transform to the X-ray timing analyses of active galactic nuclei (AGN) and quasi-periodic eruption sources (QPEs). We find that the power spectral density (PSD) slope ...
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(Halifax, N.S. : Saint Mary's University, 2022-05-06)Identifying X-ray variability in active galactic nuclei (AGN) has been a longstanding issue due to spectral model degeneracies. It often occurs on timescales too short to employ regular spectral analysis, but colour-colour ...
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(Halifax, N.S. : Saint Mary's University, 2021)X-ray emission from Seyfert 1 galaxies has a debated origin. The primary X-ray source is the compact corona, but the secondary X-ray emission is thought to originate from either a Comptonising layer or blurred reflection ...
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(Halifax, N.S. : Saint Mary's University, 2021)The Suzaku X-ray satellite has been decommissioned since 2015, leaving us with a known catalogue of observed active galactic nuclei (AGN). This work provides a timing analysis of all broad-line and narrow-line Seyfert 1 ...
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(Halifax, N.S. : Saint Mary's University, 2024-04-20)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 ...
Now showing items 1-19 of 19