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Gemini NIRI imaging of NGC 6543. The pairs of LISs are labelled as SW and NE. H 2 1-0 S(1) line image (panels a), H 2 1-0 S(1) continuum-subtracted image smoothed using a Gaussian function with a radius of 2 σ (panel b), and H 2 1-0 S(1) continuum-subtracted images of SW and NE LISs overlaid by HST [N ii] λ6584 emission contours (panels c and d).
Source publication
Despite the many studies in the last decades, the low-ionisation structures (LISs) of planetary nebulae (PNe) still hold several mysteries. Recent imaging surveys have demonstrated that LISs are composed of molecular gas. Here we report H$_2$ emission in the LISs of NGC 7009 and NGC 6543 by means of very deep narrow-band H$_2$ images taken with NIR...
Contexts in source publication
Context 1
... contrast to Fang et al.'s (2018) work, the focus of this work is on the bright ionized bipolar nebula of NGC 6543, also known as the Cat's Eye Nebula, and not on its recombination halo. The narrow-band H 2 1-0 S(1) NIRI image of NGC 6543 is presented in Figure 4. The image is smoothed using a Gaussian function with a radius of 2 σ so as we can better illustrate the detection of the emission in the SW and NE LISs. ...
Context 2
... detection of H 2 emission from both LISs of NGC 6543 is reported for the first time. A marginal detection of H 2 emission at the edges of the bipolar lobes, labelled as "caps" in Balick et al. (1994) and D-D in Miranda & Solf (1992) can also be seen in Figure 4, but deep follow-up spectroscopic observations are necessary to confirm this emission. The H 2 2-1 S(1) line at 2.24 µm is not detected in NGC 6543, but we obtained upper limits for its emission, which yields lower limits for the R(H 2 ) ratio between 2.9 and 4.7 (Table 2). ...
Context 3
... comparison of our H 2 1-0 S(1) image with the HST [N ii] λ6584 image show a strong correlation (Figure 4). Similarly to NGC 7009, H 2 emission is engulfed by the more extended [N ii] emission. ...
Context 4
... contrast to Fang et al.'s (2018) work, the focus of this work is on the bright ionized bipolar nebula of NGC 6543, also known as the Cat's Eye Nebula, and not on its recombination halo. The narrow-band H 2 1-0 S(1) NIRI image of NGC 6543 is presented in Figure 4. The image is smoothed using a Gaussian function with a radius of 2 σ so as we can better illustrate the detection of the emission in the SW and NE LISs. ...
Context 5
... detection of H 2 emission from both LISs of NGC 6543 is reported for the first time. A marginal detection of H 2 emission at the edges of the bipolar lobes, labelled as "caps" in Balick et al. (1994) and D-D in Miranda & Solf (1992) can also be seen in Figure 4, but deep follow-up spectroscopic observations are necessary to confirm this emission. The H 2 2-1 S(1) line at 2.24 µm is not detected in NGC 6543, but we obtained upper limits for its emission, which yields lower limits for the R(H 2 ) ratio between 2.9 and 4.7 (Table 2). ...
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