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Barred galaxies · evidence and sources

NGC 1097

A luminous bar feeds sweeping spiral arms around an active galactic center.

Also known as Arp 77, NGC 1097 barred spiral.

Catalog Position basis, the same label the app shows on the selection card.

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Every aspect, with its origin

One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.

ObservedCatalogComputedReconstructedIllustrativeUndocumented
Position Catalog

Registered image field

J2000 image-field center RA 2.8 h, Dec -30.3°. Field 6.9 × 7.7 arcminutes; north -0.1° right of vertical.

SourceVLT / VIMOS
EpochJ2000
LimitThe image field center is not necessarily a galaxy nucleus.
Physical data Catalog

Adopted distance

Approximately 60,000,000 light-years.

SourcePublished distance context
LimitAn approximate reference distance; distances to individual points within the image are not supplied by the observation.
Appearance Reconstructed

Observation-derived appearance

The VLT optical field preserves the bar and arms. Placement follows the approximate 60-million-light-year value on this source page; other published estimates differ. The central black hole is not directly imaged. Projected structure follows the credited observation at its published angular scale and an approximate adopted distance. Shallow depth is illustrative, not measured tomography. The source palette is preserved; brightness is adjusted for the navigable view.

SourceESO (European Southern Observatory)

What is not measured

  • Appearance: a reconstruction from measurements, not a direct observation. Observation-derived appearance. The VLT optical field preserves the bar and arms. Placement follows the approximate 60-million-light-year value on this source page; other published estimates differ. The central black hole is not directly imaged. Projected structure follows the credited observation at its published angular scale and an approximate adopted distance. Shallow depth is illustrative, not measured tomography. The source palette is preserved; brightness is adjusted for the navigable view.

Sources cited

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