Insight into Astrophysical Phenomena from VLBI Source Position Instabilities
International audience Most of the radio sources observed by VLBI, some used as defining sources in the International Celestial Reference Frame [ICRF2], show instabilities in position. These instabilities may be caused by astrophysical phenomena occurring in the central VLBI region of these objects...
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ftinsu:oai:HAL:hal-02278204v1 2023-11-12T04:27:04+01:00 Insight into Astrophysical Phenomena from VLBI Source Position Instabilities Gattano, C. Charlot, P. M2A 2019 Laboratoire d'Astrophysique de Bordeaux Pessac (LAB) Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) svalbard, Norway 2018-06-03 https://hal.science/hal-02278204 en eng HAL CCSD hal-02278204 https://hal.science/hal-02278204 BIBCODE: 2019ivs.conf.179G International VLBI Service for Geodesy and Astrometry 2018 General Meeting Proceedings: "Global Geodesy and the Role of VGOS - Fundamental to Sustainable Development", Eds. Kyla L. Armstrong, Karen D. Baver, Dirk Behrend, NASA/CP-2019-219039, p. 179-183 https://hal.science/hal-02278204 International VLBI Service for Geodesy and Astrometry 2018 General Meeting Proceedings: "Global Geodesy and the Role of VGOS - Fundamental to Sustainable Development", Eds. Kyla L. Armstrong, Karen D. Baver, Dirk Behrend, NASA/CP-2019-219039, p. 179-183, Jun 2018, svalbard, Norway [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] info:eu-repo/semantics/conferenceObject Conference papers 2018 ftinsu 2023-10-18T16:27:54Z International audience Most of the radio sources observed by VLBI, some used as defining sources in the International Celestial Reference Frame [ICRF2], show instabilities in position. These instabilities may be caused by astrophysical phenomena occurring in the central VLBI region of these objects (i.e., active galactic nuclei). On this basis, we have begun to characterize the signal included in the available VLBI position time series. Often, position instabilities happen along a preferred direction. There are cases, however, where two directions are distinguishable. The first scenario is consistent with a regular emergence of jet components from the VLBI core; hence, causing shifts of the radio emission centroid. On the other hand, the second scenario may give clues to the presence of a second black hole within the system that has its own activity offset from that of the first black hole. Comparing these directions with the orientation derived from radio-optical position offset brings further insights into astrophysical phenomena within active galactic nuclei. Conference Object Svalbard Institut national des sciences de l'Univers: HAL-INSU Norway Svalbard |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] |
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[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] Gattano, C. Charlot, P. Insight into Astrophysical Phenomena from VLBI Source Position Instabilities |
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[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] |
description |
International audience Most of the radio sources observed by VLBI, some used as defining sources in the International Celestial Reference Frame [ICRF2], show instabilities in position. These instabilities may be caused by astrophysical phenomena occurring in the central VLBI region of these objects (i.e., active galactic nuclei). On this basis, we have begun to characterize the signal included in the available VLBI position time series. Often, position instabilities happen along a preferred direction. There are cases, however, where two directions are distinguishable. The first scenario is consistent with a regular emergence of jet components from the VLBI core; hence, causing shifts of the radio emission centroid. On the other hand, the second scenario may give clues to the presence of a second black hole within the system that has its own activity offset from that of the first black hole. Comparing these directions with the orientation derived from radio-optical position offset brings further insights into astrophysical phenomena within active galactic nuclei. |
author2 |
M2A 2019 Laboratoire d'Astrophysique de Bordeaux Pessac (LAB) Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Gattano, C. Charlot, P. |
author_facet |
Gattano, C. Charlot, P. |
author_sort |
Gattano, C. |
title |
Insight into Astrophysical Phenomena from VLBI Source Position Instabilities |
title_short |
Insight into Astrophysical Phenomena from VLBI Source Position Instabilities |
title_full |
Insight into Astrophysical Phenomena from VLBI Source Position Instabilities |
title_fullStr |
Insight into Astrophysical Phenomena from VLBI Source Position Instabilities |
title_full_unstemmed |
Insight into Astrophysical Phenomena from VLBI Source Position Instabilities |
title_sort |
insight into astrophysical phenomena from vlbi source position instabilities |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02278204 |
op_coverage |
svalbard, Norway |
geographic |
Norway Svalbard |
geographic_facet |
Norway Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
International VLBI Service for Geodesy and Astrometry 2018 General Meeting Proceedings: "Global Geodesy and the Role of VGOS - Fundamental to Sustainable Development", Eds. Kyla L. Armstrong, Karen D. Baver, Dirk Behrend, NASA/CP-2019-219039, p. 179-183 https://hal.science/hal-02278204 International VLBI Service for Geodesy and Astrometry 2018 General Meeting Proceedings: "Global Geodesy and the Role of VGOS - Fundamental to Sustainable Development", Eds. Kyla L. Armstrong, Karen D. Baver, Dirk Behrend, NASA/CP-2019-219039, p. 179-183, Jun 2018, svalbard, Norway |
op_relation |
hal-02278204 https://hal.science/hal-02278204 BIBCODE: 2019ivs.conf.179G |
_version_ |
1782340807379910656 |