期刊
ASTRONOMY & ASTROPHYSICS
卷 650, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202039642
关键词
quasars: general; galaxies: jets; galaxies: active; galaxies: evolution
资金
- MCIU/AEI/FEDER,UE [AYA2016-79724-C4-1-P, PGC2018-094671-BI00]
- Comunidad de Madrid through the Atraccion de Talento grant [2017-T1/TIC-5213]
- Unidad de Excelencia 'Maria de Maeztu' Centro de Astrobiologia (CSIC-INTA) [MDM-2017-0737]
- Fundacao para a Ciencia e a Tecnologia (FCT) [UIDB/04434/2020, UIDP/04434/2020]
- FCT-CAPES Transnational Cooperation Project
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
The study focused on the interaction between radio structures and ionized gas in 13 optically selected type 2 quasars, revealing that the majority of them have active galactic nuclei components that are spatially extended. These interactions were found to be associated with merger events and ionized gas spread over large spatial scales.
Context. The role of radio mode feedback in non radio-loud quasars needs to be explored in depth to determine its true importance. Its effects can be identified based on the evidence of interactions between the radio structures and the ambient ionised gas. Aims. We investigate this interaction in a sample of 13 optically selected type 2 quasars (QSO2) at z < 0:2 with the Very Large Array (VLA) FIRST Survey radio detections, none of which are radio-loud. The ranges of [OIII]lambda 5007 and monochromatic radio luminosities are log(L-[OIII]/erg s(-1)) similar to 42.08-42.79 and log(P-1.4 (GHz)/erg s(-1) Hz(-1)) similar to 30:08 31:76. All of them show complex optical morphologies, with signs of distortion across tens of kpc due to mergers and interactions. Methods. We searched for evidence of interactions between the radio structures and the ionised gas by characterising and comparing their morphologies. The former was traced by narrow band H alpha images obtained with the GTC 10.4m Spanish telescope and the Osiris instrument. The latter is traced by VLA radio maps obtained with A and B configurations to achieve both high resolution and brightness sensitivity. Results. The radio luminosity has an active galatic nucleus (AGN) component in 11 our of 13 QSO2, which is spatially extended in our radio data in 9 of them (jets, lobes, or other). The relative contribution of the extended radio emission to the total P-1:4 GHz is in most cases in the range from 30% to 90%. The maximum sizes are in the range of d(max)(R) of around a few to 500 kpc. The QSO2 undergoing interaction or merger events appear to be invariably associated with ionised gas spread over large spatial scales with maximum distances from the AGN in the range r(max) similar to 12-90 kpc. The morphology of the ionised gas at <30 kpc is strongly influenced by AGN related processes. Evidence for radio-gas interactions exist in 10 out of 13 QSO2; that is, in all but one with confirmed AGN radio components. The interactions are identified across different spatial scales, from the nuclear narrow line region up to tens of kpc. Conclusions. Although this sample cannot be considered representative of the general population of QSO2, it supports the idea that large-scale low to modest power radio sources can exist in radio-quiet QSO2, which can provide a source of feedback on scales of the spheroidal component of galaxies and well into the circumgalactic medium, in systems where radiative mode feedback is expected to dominate.
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