Title
OBSERVATIONS OF HIGH REDSHIFT AGNs AND THEIR IMPACT ON COSMOLOGY: Gamma Ray Results for mediumhigh redshift AGNs 3C 454.3 and B,Used
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Active Galactic Nucleus (AGN) is the very small central region of an active galaxy, showing intense emissions in the high energy portions of the electromagnetic spectrum. Active galaxies also have special structural features including accretion disks, intense jets and a black hole as the most likely central engine. Detailed spectral shape of the high energy emission is studied through data obtained by both spaceborne and ground based observations. Their analysis play a key role in the understanding of AGNs. In many ways, they are also considered as special laboratories for extreme physics. They can be observed at significant redshifts where the Universe was only a fraction of its known age. This book aims at modeling AGNs and their spectra in the FGST's Large Area Telescope (LAT) energy range of 20 MeV to 300 MeV. LAT data are exploited to build a phenomenological model of mediumtohigh redshift AGNs. As a general trend, these objects show, at LAT energies, a bent spectrum as a result of the absorption by the Extragalactic Background Light(EBL). We specifically dealt with the analysis of FermiLAT data for AGNs, 3C454.3 and B21520+31 for understanding the nature of these objects.
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This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, please visit www.P65Warnings.ca.gov.
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Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
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Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.