A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490
Long Baseline Array imaging of the z = 0.663 broadline radio galaxy PKS 1421–490 reveals a 400 pc diameter high surface brightness hot spot at a projected distance of ~40 kpc from the active galactic nucleus. The isotropic X-ray luminosity of the hot spot, L 2-10 keV = 3 × 10[superscript 44] ergs s-...
| Main Authors: | , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Institute of Physics/American Astronomical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/96013 |
| _version_ | 1811074488066899968 |
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| author | Godfrey, L. E. H. Bicknell, G. V. Lovell, J. E. J. Jauncey, D. L. Gelbord, Jonathan Schwartz, D. A. Birkinshaw, M. Georganopoulos, Markos Murphy, David W. Perlman, E. S. Worrall, D. M. Marshall, Herman |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Godfrey, L. E. H. Bicknell, G. V. Lovell, J. E. J. Jauncey, D. L. Gelbord, Jonathan Schwartz, D. A. Birkinshaw, M. Georganopoulos, Markos Murphy, David W. Perlman, E. S. Worrall, D. M. Marshall, Herman |
| author_sort | Godfrey, L. E. H. |
| collection | MIT |
| description | Long Baseline Array imaging of the z = 0.663 broadline radio galaxy PKS 1421–490 reveals a 400 pc diameter high surface brightness hot spot at a projected distance of ~40 kpc from the active galactic nucleus. The isotropic X-ray luminosity of the hot spot, L 2-10 keV = 3 × 10[superscript 44] ergs s-1, is comparable to the isotropic X-ray luminosity of the entire X-ray jet of PKS 0637–752, and the peak radio surface brightness is hundreds of times greater than that of the brightest hot spot in Cygnus A. We model the radio to X-ray spectral energy distribution using a one-zone synchrotron self-Compton model with a near equipartition magnetic field strength of 3 mG. There is a strong brightness asymmetry between the approaching and receding hotspots and the hot spot spectrum remains flat (α ≈ 0.5) well beyond the predicted cooling break for a 3 mG magnetic field, indicating that the hotspot emission may be Doppler beamed. A high plasma velocity beyond the terminal jet shock could be the result of a dynamically important magnetic field in the jet. There is a change in the slope of the hotspot radio spectrum at GHz frequencies, which we model by incorporating a cutoff in the electron energy distribution at γmin ≈ 650, with higher values implied if the hotspot emission is Doppler beamed. We show that a sharp decrease in the electron number density below a Lorentz factor of 650 would arise from the dissipation of bulk kinetic energy in an electron/proton jet with a Lorentz factor Γjet gsim 5. |
| first_indexed | 2024-09-23T09:50:13Z |
| format | Article |
| id | mit-1721.1/96013 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:50:13Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/960132022-09-30T17:09:39Z A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 Godfrey, L. E. H. Bicknell, G. V. Lovell, J. E. J. Jauncey, D. L. Gelbord, Jonathan Schwartz, D. A. Birkinshaw, M. Georganopoulos, Markos Murphy, David W. Perlman, E. S. Worrall, D. M. Marshall, Herman MIT Kavli Institute for Astrophysics and Space Research Marshall, Herman Lee Long Baseline Array imaging of the z = 0.663 broadline radio galaxy PKS 1421–490 reveals a 400 pc diameter high surface brightness hot spot at a projected distance of ~40 kpc from the active galactic nucleus. The isotropic X-ray luminosity of the hot spot, L 2-10 keV = 3 × 10[superscript 44] ergs s-1, is comparable to the isotropic X-ray luminosity of the entire X-ray jet of PKS 0637–752, and the peak radio surface brightness is hundreds of times greater than that of the brightest hot spot in Cygnus A. We model the radio to X-ray spectral energy distribution using a one-zone synchrotron self-Compton model with a near equipartition magnetic field strength of 3 mG. There is a strong brightness asymmetry between the approaching and receding hotspots and the hot spot spectrum remains flat (α ≈ 0.5) well beyond the predicted cooling break for a 3 mG magnetic field, indicating that the hotspot emission may be Doppler beamed. A high plasma velocity beyond the terminal jet shock could be the result of a dynamically important magnetic field in the jet. There is a change in the slope of the hotspot radio spectrum at GHz frequencies, which we model by incorporating a cutoff in the electron energy distribution at γmin ≈ 650, with higher values implied if the hotspot emission is Doppler beamed. We show that a sharp decrease in the electron number density below a Lorentz factor of 650 would arise from the dissipation of bulk kinetic energy in an electron/proton jet with a Lorentz factor Γjet gsim 5. United States. National Aeronautics and Space Administration National Science Foundation (U.S.) 2015-03-13T15:52:04Z 2015-03-13T15:52:04Z 2009-04 2008-08 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/96013 Godfrey, L. E. H., G. V. Bicknell, J. E. J. Lovell, D. L. Jauncey, J. Gelbord, D. A. Schwartz, H. L. Marshall, et al. “A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490.” The Astrophysical Journal 695, no. 1 (April 1, 2009): 707–723. © 2009 American Astronomical Society. en_US http://dx.doi.org/10.1088/0004-637x/695/1/707 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Godfrey, L. E. H. Bicknell, G. V. Lovell, J. E. J. Jauncey, D. L. Gelbord, Jonathan Schwartz, D. A. Birkinshaw, M. Georganopoulos, Markos Murphy, David W. Perlman, E. S. Worrall, D. M. Marshall, Herman A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 |
| title | A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 |
| title_full | A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 |
| title_fullStr | A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 |
| title_full_unstemmed | A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 |
| title_short | A MULTIWAVELENGTH STUDY OF THE HIGH SURFACE BRIGHTNESS HOT SPOT IN PKS 1421–490 |
| title_sort | multiwavelength study of the high surface brightness hot spot in pks 1421 490 |
| url | http://hdl.handle.net/1721.1/96013 |
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