[ITAL]Hubble Space Telescope[/ITAL] STIS Observations of the Kinematics of Emission-Line Nebulae in Three Compact Steep-Spectrum Radio Sources
| العنوان: | [ITAL]Hubble Space Telescope[/ITAL] STIS Observations of the Kinematics of Emission-Line Nebulae in Three Compact Steep-Spectrum Radio Sources |
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| المؤلفون: | Raffaella Morganti, Alessandro Capetti, Willem H. De Vries, Christopher P. O'Dea, David Axon, Anton M. Koekemoer, Richard Gelderman, Clive Tadhunter, Peter Barthel, Stefi A. Baum, Roberto Fanti |
| المصدر: | The Astronomical Journal. 123:2333-2351 |
| بيانات النشر: | American Astronomical Society, 2002. |
| سنة النشر: | 2002 |
| مصطلحات موضوعية: | Physics, Astrophysics::High Energy Astrophysical Phenomena, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Kinematics, Astrophysics, Rotation, Acceleration, Amplitude, Space and Planetary Science, Bow shock (aerodynamics), Emission spectrum, Spectroscopy, Astrophysics::Galaxy Astrophysics, Space Telescope Imaging Spectrograph |
| الوصف: | We have obtained Hubble Space Telescope Space Telescope Imaging Spectrograph long-slit spectroscopy of the aligned emission-line nebulae in three compact steep-spectrum radio sources: 3C 67, 277.1, and 303.1. We find systematic offsets (~300–500 km s-1) of the emission-line velocities on one or both sides of the radio sources. We also see evidence for broad lines (FWHM ~ 500 km s-1) and complex emission-line profiles. In 3C 303.1 the data are consistent with multiple components and possibly split lines. The amplitude of the velocity variations is not so large as to exclude gravitationally induced motions. However, the complex kinematics, the lack of a signature of Keplerian rotation, and the association of the velocity variations with the radio lobes are consistent with the motions being driven by the expansion of the radio source. These kinematic signatures are consistent with an interaction between the expanding radio lobe and the emission-line clouds in which the clouds have been accelerated to velocities ~300–500 km s-1. Acceleration of the clouds by the bow shock is plausible given the estimated densities in the clouds and the velocities observed in the much smaller compact symmetric objects and with expansion velocities estimated from spectral aging. |
| تدمد: | 1538-3881 0004-6256 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::cb8175581b9d43c75caa80fdbaffc907 https://doi.org/10.1086/340076 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........cb8175581b9d43c75caa80fdbaffc907 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15383881 00046256 |
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