Orion Nebula (M 42)

Release of cubes and maps of the Huygens region of the Orion Nebula (M 42) published by Weilbacher et al. 2015 A&A 528, A114 (arXiv:1507.00006).

Full Cubes

The complete datacubes in FITS formats are linked here.

The full format of these cubes is described in the Weilbacher et al. paper.

Subcubes

If one does not need a full cube but only a small spatial part of it, one can use the CutOut tool provided by the MUSE collaboration to extract (small) subcubes of the full dataset.

  • load standard cube in CutOut tool: LR|1.25
  • load improved cube in CutOut tool: HR|0.85

Brief usage instructions: In both cases, select the cube from the list to load it and dismiss the dialog. Then you can move around with the mouse (click the arrow button), choose wavelength range and spatial extraction size on the right, and then select regions to cut out (with the scissors button). After the tool has created the subcube, you can use the download link on the right (the floppy disk).

Note: The subcubes extracted here only contain data (DATA) and variance (STAT) cubes, but no images.

Maps

All maps presented in the paper are reproduced here. We also provide FITS versions of all of them.

Color images

Color composite using fluxes of three emission lines, with blue: Hbeta, green: [N II] 6584, and red: [S II] 6731.
Color composite using fluxes of three emission lines, with blue: Hbeta, green: [N II] 6584, and red: [S II] 6731.
Link to FITS files:

Color composite using fluxes of three emission lines, with blue: Hbeta, green: [N II] 6584, and red: [S II] 6731. Dereddened using the Balmer decrement.
Color composite using fluxes of three emission lines, with blue: Hbeta, green: [N II] 6584, and red: [S II] 6731. Dereddened using the Balmer decrement.
Link to FITS files:

Color composite, using emission line fluxes of red: Paschen 9, green: Halpha, blue: Hbeta.
Color composite, using emission line fluxes of red: Paschen 9, green: Halpha, blue: Hbeta.

Link to FITS files:

False color image, using the three ionization levels of oxygen detectable with the MUSE data: red: [O III] 5007, green: [O II] 7320, blue: [O I] 6300, all corrected for extinction using the Balmer decrement.
Enhanced color image, using the three ionization levels of oxygen detectable with the MUSE data: red: [O III] 5007, green: [O II] 7320, blue: [O I] 6300, all corrected for extinction using the Balmer decrement.
Link to FITS files:

Extinction map

Extinction map of the central Orion Nebula, as derived from the Hα to Hβ flux ratio, displayed as c_Hβ. Bright stars are marked again with black circles, the smoothed contours are 0.4 ≤ c_Hβ ≤ 1.2 in steps of 0.2.
Extinction map of the central Orion Nebula, as derived from the Hα to Hβ flux ratio, displayed as c_Hβ. Bright stars are marked again with black circles, the smoothed contours are 0.4 ≤ c_Hβ ≤ 1.2 in steps of 0.2.

Link to FITS file: cleaned image

Single emission lines

Reddening-corrected flux map of [O III] 5007.
Reddening-corrected flux map of [O III] 5007.
Link to FITS file: [O III] flux map

Reddening-corrected flux map of [S III] 6312.
Reddening-corrected flux map of [S III] 6312.
Link to FITS file: [S III] flux map

Reddening-corrected flux map of [S II] 6731.
Reddening-corrected flux map of [S II] 6731.
Link to FITS file: [S II] flux map

Reddening-corrected flux map of [O i] 6300, partially corrected for sky-line contribution.
Reddening-corrected flux map of [O i] 6300, partially corrected for sky-line contribution.

Link to FITS file: [O I] flux map (original), [O I] flux map (partially corrected for sky contribution)

Diagnostic ratios

halpha_div_hei6678_v4
Reddening-corrected emission line ratio map of Hα/He I 6678.

Link to FITS file: Map of Halpha flux divided by He I 6678 flux (both dereddened)

halpha_div_oi6300_v4
Reddening-corrected emission line ratio map of Hα/[O I] 6300, partially corrected for sky-line contribution to [O i] 6300.
Link to FITS file: Map of Halpha flux divided by [O I] 6300 flux (both dereddened, [O I] partially sky corrected)

hbeta_div_oiii5007_v4
Reddening-corrected emission line ratio map of Hβ/[O III] 5007. The [O III] shell and the SE-NW ionization boundary discussed by O’Dell et al. (2009) are marked.
Link to FITS file: Map of Hbeta flux divided by [O III] 5007 flux (both dereddened)

oiii5007_div_nii6584_v4
Reddening-corrected emission line ratio map of [O III] 5007/[N II] 6584.
Link to FITS file: Map of [O III] 5007 flux divided by [N II] 6584 flux (both dereddened)

Physical properties

  • Electron temperature

Electron temperature (T_e) of M42 computed from [S III]
Link to FITS files: unsmoothed, smoothed (with 5×5 pixel median filter)

Electron temperature (T_e) computed from [N II]
Link to FITS files: unsmoothed, smoothed (with 5×5 pixel median filter)

  • Electron density

Electron density (N_e) of M42 computed from [Cl III]
Link to FITS files: unsmoothed, smoothed (with 5×5 pixel median filter)

Electron density (N_e) of M42 computed from [S II]
Electron density (N_e) of M42 computed from [S II]
Link to FITS files: unsmoothed, smoothed (with 3×3 pixel median filter)

Spatial velocity field

Velocity field as traced by the lines Hα (with respect to barycentric velocity). The locations of the brighter stars in the field are marked as black circles, further noticeable features are annotated or marked in green or gray.
Velocity field as traced by the lines Hα (with respect to barycentric velocity). The locations of the brighter stars in the field are marked as black circles, further noticeable features are annotated or marked in green or gray.

Link to FITS file:

Velocity field as traced by [N ii] 6584 relative to Hα. Note that the linear color scale is asymmetric. The locations of the brighter stars in the field are marked as black circles.
Velocity field as traced by [N ii] 6584 relative to Hα. Note that the linear color scale is asymmetric. The locations of the brighter stars in the field are marked as black circles.
Link to FITS files:

Velocity field as traced by [S ii] 6731 relative to [N ii] 6584. The locations of the brighter stars in the field are marked as black circles.
Velocity field as traced by [S ii] 6731 relative to [N ii] 6584. The locations of the brighter stars in the field are marked as black circles.
Link to FITS files:

Contact

Please contact Peter Weilbacher for questions on this dataset.