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- W4224436546 abstract "Abstract NGC 4945 harbors one of the nearest active galactic nuclei (AGNs), which allows us to reach high spatial resolution with current observational facilities. The Seyfert 2 nucleus is deeply obscured by an edge-on disk with A V ∼ 14, requiring infrared observations to study circumnuclear structures and the interstellar medium. In this work, we present an imaging and long-slit spectroscopic study of the nuclear region with a spatial resolution of 6.5 pc, based on Flamingos-2 (F2) and T-ReCS data taken at the Gemini South observatory. We report subarcsecond photometric measurements of the nucleus in J , H , and K s filters, and at larger apertures. We do not detect nuclear variability. The nuclear spectra confirm that even in the K band the AGN emission-line features are completely obscured by dust. We detect a circumnuclear disk in the K band as well as in the mid-infrared N and Q a bands, with a radial scale length of ∼120 pc. The disk shows knots mostly in a ring-like arrangement that has been previously detected with Pa α observations from the Hubble Space Telescope, indicating that these are deeply embedded, massive young star clusters. We present here the spectrum of one of the brightest unresolved objects ( R < 5 pc), which we identify as a super star cluster candidate with <?CDATA ${M}_{{K}_{{rm{s}}}},-16.6pm 0.4$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>K</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>s</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:msub> <mml:mspace width=0.25em /> <mml:mo>−</mml:mo> <mml:mn>16.6</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.4</mml:mn> </mml:math> . For the circumnuclear region, a detailed rotation curve allows us to measure a nuclear mass of M = (4.4 ± 3) × 10 6 M ⊙ within a radius of ∼6.5 pc. We also report the detection of hot dust (∼1000 K) out to a nuclear distance of 80 pc measured along the semimajor axis." @default.
- W4224436546 created "2022-04-27" @default.
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- W4224436546 date "2022-04-25" @default.
- W4224436546 modified "2023-10-18" @default.
- W4224436546 title "An Infrared View of the Obscured AGN Environment in NGC 4945" @default.
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- W4224436546 doi "https://doi.org/10.3847/1538-3881/ac5ea4" @default.
- W4224436546 hasPublicationYear "2022" @default.
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