Free Access
Volume 583, November 2015
Article Number A104
Number of page(s) 19
Section Extragalactic astronomy
Published online 02 November 2015

Online material

Appendix A: Figures

We have attached the line maps to all important emission lines that were detected except for the H2 Q-branch. The Q-branch is situated at the end of K-band and therefore the maps show noise features as well. However, the flux and FWHM of these lines is given in Table 1 for the regions discussed here. Additionally, several line ratio maps are presented in Fig. A.1

Figure A.2 shows the flux, FWHM, and EW of all other detected H2 lines detected up to 2.3μm. The flux distribution is very similar in all H2 lines and peaks on the nucleus. The FWHM is increased in the center along the minor axis and H2(10)S(3) shows an increased width in the northeast and a decreased width in the northwest, similar to H2(10)S(1). The nuclear spiral is detected in all EW maps which show an increased EW at the position of the spiral density wave.

Figure A.3 shows the LOSV of all H2 lines from A.2 and additionally the LOSV maps of the detected ionized gas. The LOSV in the molecular lines is very similar, as are flux and EW, indicating that they all originate from the same region, i.e. the nuclear molecular gas disk. For the ionized lines it is hard to tell because the region in which they are detected is not large enough to give information about the spatial velocity distribution. However, the LOSV fields do not look very different from the molecular LOSV fields (e.g., Brγ).

thumbnail Fig. A.1

Logarithmic line ratios of H2(10)S(1) over Brγ and [Fe ii] over Brγ in a) and b). Panel c): logarithmic H2(10)S(1) over He i ratio. Panels d), e), f): H2(21)S(1) over H2(10)S(1), H2(10)S(2) over H2(10)S(0) and H2(10)S(3) over H2(10)S(1).

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thumbnail Fig. A.2

Molecular hydrogen emission lines. From left to right: flux [10-20 W m-2], FWHM (corrected for instrumental broadening) [km s-1] and EW [Å] maps of, from top to bottom: H2(10)S(3), H2(10)S(2), H2(10)S(0), and H2(21)S(1).

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thumbnail Fig. A.3

Presented are the LOSV [km s-1] maps of, from left to right and top to bottom: [Fe ii], He i, narrow Brγ, H2(10)S(3), H2(10)S(2), H2(10)S(0), H2(21)S(1).

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© ESO, 2015

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