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Long Term Optical And X Ray Monitoring Of Black Hole Candidates In Extragalactic Globular Clusters
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Book Synopsis Long Term Optical and X-ray Monitoring of Black Hole Candidates in Extragalactic Globular Clusters by : Kristen C. Dage
Download or read book Long Term Optical and X-ray Monitoring of Black Hole Candidates in Extragalactic Globular Clusters written by Kristen C. Dage and published by . This book was released on 2020 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The question of whether globular clusters (GCs) host black holes (BHs) has been a long-standing question in astronomy. Because of the dynamics of the crowded globular cluster environment, they should be extremely efficient at forming black hole-black hole binaries (BBHs), such as those detected merging by LIGO. LIGO is detecting many more (and more massive!) BBHs than was ever expected, and a first step to understanding the formation of these binaries is to understand BHs in GCs. However, very few ways exist to study BHs in GCs observationally, and there is only one effective method to study BH candidates in extragalactic GCs: by studying ultraluminous X-ray sources (ULXs) that are associated with GCs. Because their X-ray luminosities far exceed the Eddington limit for a stellar mass BH, ULXs in GCs are good BH candidates. However, they are very rare, with only a few per galaxy (with only 10 currently known sources among 3 galaxies). In this thesis, we study a total of 9 ULX sources that are associated with globular clusters in both X-ray and optical. One of these, RZ2109, shows extreme variability across more than 15 years of monitoring in X-ray, with changes of almost an order of magnitude on the order of days. Typically any variability in flux is expected to be correlated with a change in the spectral properties of the source (i.e. some physical change in the system), however, the shape of the X-ray spectrum of RZ2109 remains the same across all observations. X-ray and optical studies of all 9 GC ULXs indicate a potential correlation between the X-ray spectrum and presence of optical emission beyond the cluster continuum--one of the few X-ray-optical correlations known for astronomical objects. Lastly, we present long-term monitoring in optical of RZ2109 shows a broad [OIII] emission line which declines long-term over almost ten years, and then re-brightens.
Book Synopsis From X-ray Binaries to Quasars: Black Holes on All Mass Scales by : Thomas J. Maccarone
Download or read book From X-ray Binaries to Quasars: Black Holes on All Mass Scales written by Thomas J. Maccarone and published by Springer Science & Business Media. This book was released on 2007-01-28 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume brings together contributions from many of the world's leading authorities on black hole accretion. The papers within represent part of a new movement to make use of the relative advantages of studying stellar mass and supermassive black holes, and to bring together the knowledge gained from the two approaches. The topics discussed include black hole observational and theoretical work-variability, spectroscopy, disk-jet connections, and multi-wavelength campaigns on black holes.
Book Synopsis Coevolution of Black Holes and Galaxies: Volume 1, Carnegie Observatories Astrophysics Series by : Luis C. Ho
Download or read book Coevolution of Black Holes and Galaxies: Volume 1, Carnegie Observatories Astrophysics Series written by Luis C. Ho and published by Cambridge University Press. This book was released on 2004-09-09 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was originally published in 2004. Black holes are among the most mysterious objects in the Universe. Weighing up to several billion Suns, massive black holes have long been suspected to be the central powerhouses of energetic phenomena such as quasars. Advances in astronomy have not only provided spectacular proof of this long-standing paradigm, but have revealed the unexpected result that far from being rare, exotic beasts, they inhabit the center of virtually all large galaxies. Candidate black holes have been identified in increasingly large numbers of galaxies, both inactive and active, to the point where statistical studies are possible. Fresh work has highlighted the close connection between the formation, growth, and evolution of supermassive black holes and their host galaxies. This volume contains the invited lectures from an international symposium that was held to explore this exciting theme, and is a valuable review for professional astronomers and graduate students.
Book Synopsis Supermassive Black Holes in the Distant Universe by : A.J. Barger
Download or read book Supermassive Black Holes in the Distant Universe written by A.J. Barger and published by Springer Science & Business Media. This book was released on 2004-08-03 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quasars, and the menagerie of other galaxies with "unusual nuclei", now collectively known as Active Galactic Nuclei or AGN, have, in one form or another, sparked the interest of astronomers for over 60 years. The only known mechanism that can explain the staggering amounts of energy emitted by the innermost regions of these systems is gravitational energy release by matter falling towards a supermassive black hole --- a black hole whose mass is millions to billions of times the mass of our Sun. AGN emit radiation at all wavelengths. X-rays originating at a distance of a few times the event horizon of the black hole are the emissions closest to the black hole that we can detect; thus, X-rays directly reveal the presence of active supermassive black holes. Oftentimes, however, the supermassive black holes that lie at the centers of AGN are cocooned in gas and dust that absorb the emitted low energy X-rays and the optical and ultraviolet light, hiding the black hole from view at these wavelengths. Until recently, this low-energy absorption presented a major obstacle in observational efforts to map the accretion history of the universe. In 1999 and 2000, the launches of the Chandra and XMM-Newton X-ray Observatories finally broke the impasse. The impact of these observatories on X-ray astronomy is similar to the impact that the Hubble Space Telescope had on optical astronomy. The astounding new data from these observatories have enabled astronomers to make enormous advances in their understanding of when accretion occurs.
Book Synopsis Joint Evolution of Black Holes and Galaxies by : M. Colpi
Download or read book Joint Evolution of Black Holes and Galaxies written by M. Colpi and published by CRC Press. This book was released on 2006-01-27 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black holes are among the most mysterious objects that the human mind has been capable of imagining. As pure mathematical constructions, they are tools for exploiting the fundamental laws of physics. As astronomical sources, they are part of our cosmic landscape, warping space-time, coupled to the large-scale properties and life cycle of their host
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of X-ray and Gamma-ray Astrophysics by : Cosimo Bambi
Download or read book Handbook of X-ray and Gamma-ray Astrophysics written by Cosimo Bambi and published by Springer Nature. This book was released on with total page 5912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Galactic Black Hole Binaries: High-Energy Radiation by :
Download or read book Galactic Black Hole Binaries: High-Energy Radiation written by and published by . This book was released on 1997 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations of galactic black hole candidates made by the instruments aboard the Compton GRO in the hard X-ray and gamma-ray bands have significantly enhanced our knowledge of the emission properties of these objects. Understanding these observations presents a formidable challenge to theoretical models of the accretion flow onto the compact object and of the physical mechanisms that generate high-energy radiation. Here we summarize the current state of observations and theoretical interpretation of the emission from black hole candidates above 20 keV. The all-sky monitoring capability of BATSE allows, for the first time, nearly continuous studies of the high-energy emission from more than a dozen black hole candidates. These long-term datasets are particularly well-suited to multi- wavelength comparison studies, from the radio upward in frequency (Zhang et al. 1997a, these proceedings). Energy spectral evolution and/or spectral state transitions have been observed from many of the black hole candidates. Moderately deep searches of the galactic plane suggest a deficit of weak gamma-ray transients. Such population studies have implications for the origin of black hole binaries and the nature of accretion events.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Bright Outburst of a New Black Hole Candidate by : Carlos Celma Querol
Download or read book The Bright Outburst of a New Black Hole Candidate written by Carlos Celma Querol and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The motivation of this thesis is to monitor the data of the 2018 outburst of the black hole candidate MAXI J1820+070. This project combines theoretical background about X-ray binaries with the experimental work done in the process of achieving optical magnitudes using a CCD camera: Telescopi Joan Oró ground based telescope. We present the optical light curves and colours of MAXI J1820+070 during the March-November 2018 outburst. After obtaining the magnitudes, using MAXI and Swift-UVOT as space observatories we extend our range to the X-ray band and study the different states and physical processes that occur in them. Finally, we give physical interpretation of all obtained data and characterize the spectral shape of the infrared, optical, UV and X-ray emission in the different components of MAXI J1820+070 outburst. We conclude that MAXI J1820+070 show the typical properties of a BHT: our results show the canonical BHT states, the disk irradiation changing in the soft state and the linear increase of the R-I colour indicating a cooling of the disk. We also give evidence that the optical emission in the soft state is bluer than in the hard.
Book Synopsis Compact Stellar X-ray Sources by : Walter Lewin
Download or read book Compact Stellar X-ray Sources written by Walter Lewin and published by Cambridge University Press. This book was released on 2006-04-06 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray astronomy is the prime available window on astrophysical compact objects: black holes, neutron stars and white dwarfs. In this book, prominent experts provide a comprehensive overview of the observations and astrophysics of these objects. This is a valuable reference for graduate students and active researchers.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis EUV, X-ray, and Gamma-ray Instrumentation for Astronomy and Atomic Physics by : Charles J. Hailey
Download or read book EUV, X-ray, and Gamma-ray Instrumentation for Astronomy and Atomic Physics written by Charles J. Hailey and published by . This book was released on 1989 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1987 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The X-ray Universe by : Wallace H. Tucker
Download or read book The X-ray Universe written by Wallace H. Tucker and published by . This book was released on 1985 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beyond the range of optical perception--and of ordinary imaginings--a new and violent universe lay undetected until the advent of space exploration. Supernovae, black holes, quasars and pulsars--these were the secrets of the highenergy world revealed when, for the first time, astronomers attached their instruments to rockets and lofted them beyond the earth's x-ray-absorbing atmosphere. The X-Ray Universe is the story of these explorations and the fantastic new science they brought into being. It is a first-hand account: Riccardo Giacconi is one of the principal pioneers of the field, and Wallace Tucker is a theorist who worked closely with him at many critical periods. The book carries the reader from the early days of the Naval Research Laboratory through the era of V-2 rocketry, Sputnik, and the birth of NASA, to the launching of the Einstein X-Ray Observatory. But this is by no means just a history. Behind the suspenseful, sometimes humorous details of human personality grappling with high technology lies a sophisticated exposition of current cosmology and astrophysics, from the rise and fall of the steady-state theory to the search for the missing mass of the universe.
Book Synopsis New Worlds, New Horizons in Astronomy and Astrophysics by : National Research Council
Download or read book New Worlds, New Horizons in Astronomy and Astrophysics written by National Research Council and published by National Academies Press. This book was released on 2011-02-04 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven by discoveries, and enabled by leaps in technology and imagination, our understanding of the universe has changed dramatically during the course of the last few decades. The fields of astronomy and astrophysics are making new connections to physics, chemistry, biology, and computer science. Based on a broad and comprehensive survey of scientific opportunities, infrastructure, and organization in a national and international context, New Worlds, New Horizons in Astronomy and Astrophysics outlines a plan for ground- and space- based astronomy and astrophysics for the decade of the 2010's. Realizing these scientific opportunities is contingent upon maintaining and strengthening the foundations of the research enterprise including technological development, theory, computation and data handling, laboratory experiments, and human resources. New Worlds, New Horizons in Astronomy and Astrophysics proposes enhancing innovative but moderate-cost programs in space and on the ground that will enable the community to respond rapidly and flexibly to new scientific discoveries. The book recommends beginning construction on survey telescopes in space and on the ground to investigate the nature of dark energy, as well as the next generation of large ground-based giant optical telescopes and a new class of space-based gravitational observatory to observe the merging of distant black holes and precisely test theories of gravity. New Worlds, New Horizons in Astronomy and Astrophysics recommends a balanced and executable program that will support research surrounding the most profound questions about the cosmos. The discoveries ahead will facilitate the search for habitable planets, shed light on dark energy and dark matter, and aid our understanding of the history of the universe and how the earliest stars and galaxies formed. The book is a useful resource for agencies supporting the field of astronomy and astrophysics, the Congressional committees with jurisdiction over those agencies, the scientific community, and the public.
