Query : 2019A&A...629A..98V

2019A&A...629A..98V - Astronomy and Astrophysics, volume 629A, 98-98 (2019/9-1)

New insights on the central stellar population and gas outflow in NGC 1068 from YJH spectroscopy with SPHERE/VLT.


Abstract (from CDS):

Aims. We characterise the properties of stars, dust, and gas and their spatial distribution in the central region of the Seyfert 2 galaxy NGC 1068.Method. Our study is based on near-infrared (YJH, 0.95-1.650 µm, R=350) long-slit spectroscopy observations of the central region of NGC 1068 with a 0.4'' spatial resolution. We decomposed the observed continuum emission into three components: hot dust, stars, and scattered light from the central engine. We measured their contributions at various distances from the nucleus. We also measured fluxes and Doppler shifts for the emission lines in our spectrum to probe the physical conditions of the narrow line region.
Results. Dust and stars are the main sources of continuum emission, but scattered light from the central engine has also been detected in the very central region. Together, these three components reproduce the observed continuum well. The dust emission is compatible with a 830 K blackbody. It has only been detected in the very central region and is not spatially resolved. The stellar content is ubiquitous. It harbours a 250 pc cusp centred around the nucleus, over-imposed on a young stellar background. The spectrum of the cusp is consistent with a 120Myr old single stellar population. Finally, the emission lines exhibit a significant Doppler shift that is consistent with a radial outflow from the nucleus in a biconical structure. The [FeII] behaviour strongly differs from other lines, indicating that it arises from a different structure.

Abstract Copyright: © P. Vermot et al. 2019

Journal keyword(s): galaxies: active - infrared: galaxies - galaxies: individual: NGC 1068 - galaxies: Seyfert - galaxies: stellar content - techniques: spectroscopic

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 BD+00 413 * 02 31 07.1586113322 +00 45 14.479651931   11.75 10.90     ~ 3 0
2 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4350 2

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