Published online by Cambridge University Press: 05 January 2014
7.1 Introduction
I'll begin this chapter with one of my favorite quotes about black holes:
Of all the conceptions of the human mind, from unicorns to gargoyles to the hydrogen bomb, the most fantastic, perhaps, is the black hole; a hole in space with a definite edge into which anything can fall and out of which nothing can escape; a hole with a gravitational force so strong that even light is caught and held in its grip; a hole that curves space and warps time. Like unicorns and gargoyles, black holes seem more at home in the realms of science fiction and ancient myth than in the real Universe. Nonetheless, well-tested laws of physics predict firmly that black holes exist.
(Thorne, 1994)… and add that not only do the laws of physics predict that black holes exist, but a vast array of observational evidence points to their existence in a range of masses and environments, throughout the universe. Whether or not they really exist is debated by some and is hard to prove to the satisfaction of others, but there are clearly a vast number of objects (> 1016) in the observable universe that conform very closely to our concept of a black hole (i.e., high accretion efficiency but otherwise “dark,” no apparent surface, simple scaling of properties over a range ≥ 108 in mass). In this contribution to the XXI Canary Islands Winter School of Astrophysics, I focus on these objects, specifically on the observational consequences of accretion onto them, and the associated feedback to the surrounding environment.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.