Results for "Active Galactic Nuclei (AGN)"
Changing Look AGN
**Changing Look Active Galactic Nuclei (CLAGN)** are a type of **Active Galactic Nuclei (AGN)** that exhibit a significant change in their **spectral energy distribution (SED)** over time, often transitioning from a **radio-loud** to a **radio-quiet** state or vice versa. ## Overview Active Galactic Nuclei (AGN) are incredibly luminous objects at the centers of galaxies, powered by supermassive black holes (SMBHs) actively accreting material. These objects are characterized by their intense emission across the entire electromagnetic spectrum, from radio waves to gamma rays. Changing Look Active Galactic Nuclei (CLAGN) are a subset of AGN that display a remarkable transformation in their spectral energy distribution (SED), often accompanied by changes in their **optical**, **ultraviolet (UV)**, **X-ray**, and **radio** emission. This phenomenon has sparked significant interest in the astrophysical community, as it may provide insights into the complex processes governing the growth and evolution of SMBHs. The study of CLAGN has been facilitated by the advent of advanced telescopes and spectrographs, which have enabled astronomers to monitor the SED of these objects over extended periods. Observations have revealed that CLAGN can undergo significant changes in their emission properties, often in response to variations in the accretion rate or the presence of **relativistic jets**. These changes can be accompanied by dramatic shifts in the object's **luminosity**, **color**, and **polarization**, making CLAGN fascinating objects for study. ## History/Background The concept of CLAGN emerged in the 1990s, as astronomers began to recognize that some AGN exhibited unusual variability in their SED. Early studies focused on the **optical** and **UV** properties of these objects, which were found to change over timescales of months to years. The development of more sensitive telescopes and spectrographs has since enabled astronomers to study CLAGN in greater detail, revealing the complex interplay between accretion, jet activity, and radiation. ## Key Information * **Definition**: CLAGN are AGN that exhibit a significant change in their SED over time, often transitioning from a radio-loud to a radio-quiet state or vice versa. * **Characteristics**: CLAGN are typically found in galaxies with **supermassive black holes** (SMBHs) with masses ranging from 10^6 to 10^9 solar masses. * **Variability**: CLAGN can exhibit dramatic changes in their emission properties, including shifts in luminosity, color, and polarization. * **Accretion**: Changes in the accretion rate are thought to be a key driver of CLAGN variability, with variations in the SMBH's spin and magnetic field also playing a role. * **Relativistic jets**: CLAGN often exhibit relativistic jets, which can interact with the surrounding interstellar medium, producing **synchrotron radiation** and **inverse Compton scattering**. ## Significance The study of CLAGN has significant implications for our understanding of AGN and SMBH growth. By monitoring the SED of these objects over time, astronomers can gain insights into the complex processes governing the growth and evolution of SMBHs. CLAGN may also provide a unique window into the physics of relativistic jets and the interaction between jets and the surrounding interstellar medium. INFOBOX: - Name: Changing Look Active Galactic Nuclei (CLAGN) - Type: Active Galactic Nuclei (AGN) - Date: 1990s (concept emergence) - Location: Galaxies with supermassive black holes (SMBHs) - Known For: Exhibiting significant changes in spectral energy distribution (SED) over time TAGS: Active Galactic Nuclei (AGN), Supermassive Black Holes (SMBHs), Spectral Energy Distribution (SED), Relativistic Jets, Accretion, Galaxy Evolution, Astrophysics
Space & AstronomyQuasars
Quasars are extremely luminous active galactic nuclei (AGN) powered by the accretion of gas onto a supermassive black hole, releasing enormous amounts of electromagnetic radiation. ## Overview Quasars are among the most enigmatic and fascinating objects in the universe, emitting an incredible amount of energy from their cores. These quasi-stellar objects, abbreviated QSO, are thought to be powered by the accretion of gas onto a supermassive black hole at the center of a galaxy. The accretion disc, a swirling ring of hot, dense gas, releases energy in the form of electromagnetic radiation, making quasars visible from vast distances. Quasars are often referred to as "lighthouses of the universe" due to their immense luminosity, which can outshine entire galaxies. The study of quasars has revolutionized our understanding of the universe, providing insights into the formation and evolution of galaxies, as well as the growth of supermassive black holes. Quasars are believed to be among the most massive objects in the universe, with some having masses exceeding 10 billion times that of the sun. The radiation emitted by quasars can be so intense that it can ionize the surrounding intergalactic medium, creating a "bowl" of ionized gas around the quasar. ## History/Background The discovery of quasars dates back to the 1950s, when astronomers began to notice unusual, point-like objects in the sky. These objects were initially thought to be distant stars, but their unusual spectra and brightness soon led to the realization that they were something much more exotic. The term "quasi-stellar object" was coined in the 1960s to describe these enigmatic objects, which were later found to be powered by supermassive black holes. The first quasar, 3C 273, was discovered in 1959 by astronomer Maarten Schmidt, who was studying the spectrum of a faint object in the constellation Virgo. Schmidt's discovery sparked a flurry of interest in quasars, leading to a new era of research into these mysterious objects. Since then, thousands of quasars have been discovered, and our understanding of these objects has grown significantly. ## Key Information Quasars are characterized by their immense luminosity, which can be thousands of times greater than that of a galaxy like the Milky Way. The radiation emitted by quasars is thought to be powered by the accretion of gas onto a supermassive black hole, which can have a mass ranging from millions to tens of billions of solar masses. The accretion disc, a swirling ring of hot, dense gas, releases energy in the form of electromagnetic radiation, making quasars visible from vast distances. Quasars are also characterized by their high redshifts, which are a result of the expansion of the universe. The redshifts of quasars are of cosmological origin, indicating that these objects are seen as they were in the distant past, when the universe was still in its early stages of formation. The study of quasars has provided valuable insights into the formation and evolution of galaxies, as well as the growth of supermassive black holes. ## Significance Quasars are significant objects in the universe, providing insights into the formation and evolution of galaxies, as well as the growth of supermassive black holes. The study of quasars has also led to a greater understanding of the universe's large-scale structure, including the distribution of galaxies and the formation of galaxy clusters. Quasars are also thought to be among the most massive objects in the universe, with some having masses exceeding 10 billion times that of the sun. INFOBOX: - Name: Quasars - Type: Active Galactic Nuclei (AGN) - Date: 1959 (first quasar discovered) - Location: Throughout the universe - Known For: Extremely luminous objects powered by supermassive black holes TAGS: Quasars, Active Galactic Nuclei (AGN), Supermassive Black Holes, Accretion Disc, Electromagnetic Radiation, Redshift, Cosmology, Galaxy Evolution, Galaxy Formation.