[ITAL]Chandra[/ITAL] Observations of the Evolving Core of the Starburst Galaxy NGC 253
| Autor: | Kimberly A. Weaver, David K. Strickland, Timothy M. Heckman, Michael Dahlem |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Supermassive black hole Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Torus Starburst region Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Luminosity Core (optical fiber) Black hole Space and Planetary Science Outflow Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 576:L19-L23 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | Chandra observations of the core of the nearby starburst galaxy NGC 253 reveal a heavily absorbed source of hard X-rays embedded within the nuclear starburst region. The source has an unabsorbed, 2 to 10 keV luminosity of >=10^39 erg/s and photoionizes the surrounding gas. We observe this source through a dusty torus with a neutral absorbing column density of NH ~ 2x10^23 cm^-2. The torus is hundreds of pc across and collimates the starburst-driven nuclear outflow. We suggest that the ionizing source is an intermediate-mass black hole or a weakly accreting supermassive black hole, which may signal the beginnings or endings of AGN activity. |
| Databáze: | OpenAIRE |
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