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NGC 1433 (Barred Spiral Galaxy)


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NGC 1433
Barred Spiral Galaxy (棒渦巻銀河)
Gx SBa


別名 (Other names)
PGC 13586, ESO 249-14, AM 0340-472, IRAS 03404-4722

明るさ (Brightness)
9.8等級

星座 (Constellation)
とけい座 (Hor) (Horologium)

距離 (Distance)
3,200万光年 (32 million light-years)

NGC 1433 is a barred spiral galaxy located 32 million light years from the Earth in the constellation Horologium.

NGC 1433 (Barred Spiral Galaxy) : Picture

NGC 1433 (Barred Spiral Galaxy)
NGC 1433 (Barred Spiral Galaxy)
(C) ESA/Hubble & NASA, Acknowledgements: D. Calzetti (UMass) and the LEGUS Team
This view, captured by the NASA/ESA Hubble Space Telescope, shows a nearby spiral galaxy known as NGC 1433. At about 32 million light-years from Earth, it is a type of very active galaxy known as a Seyfert galaxy — a classification that accounts for 10% of all galaxies. They have very bright, luminous centres comparable to that of our galaxy, the Milky Way.

Galaxy cores are of great interest to astronomers. The centres of most, if not all, galaxies are thought to contain a supermassive black hole, surrounded by a disc of infalling material.

NGC 1433 is being studied as part of a survey of 50 nearby galaxies known as the Legacy ExtraGalactic UV Survey (LEGUS). Ultraviolet radiation is observed from galaxies, mainly tracing the most recently formed stars. In Seyfert galaxies, ultraviolet light is also thought to emanate from the accretion discs around their central black holes. Studying these galaxies in the ultraviolet part of the spectrum is incredibly useful to study how the gas is behaving near the black hole. This image was obtained using a mix of ultraviolet, visible, and infrared light.

LEGUS will study a full range of properties from a sample of galaxies, including their internal structure. This Hubble survey will provide a unique foundation for future observations with the James Webb Space Telescope (JWST) and the Atacama Large Millimeter/submillimeter Array (ALMA). ALMA has already caught unexpected results relating to the centre of NGC 1433, finding a surprising spiral structure in the molecular gas close to the centre of NGC 1433. The astronomers also found a jet of material flowing away from the black hole, extending for only 150 light-years — the smallest such molecular outflow ever observed in a galaxy beyond our own.

NGC 1433
The nearby active galaxy NGC 1433 from ALMA and Hubble
(C) ALMA (ESO/NAOJ/NRAO)/NASA/ESA/F. Combes
The main image, showing the nearby active galaxy NGC 1433, comes from the NASA/ESA Hubble Space Telescope. The coloured structures near the centre shown in the insert are from recent ALMA observations that have revealed a spiral shape, as well as an unexpected outflow, for the first time.

NGC 1433
Composite view of the galaxy NGC 1433 from ALMA and Hubble
(C) ALMA (ESO/NAOJ/NRAO)/NASA/ESA/F. Combes
This detailed view shows the central parts of the nearby active galaxy NGC 1433. The dim blue background image, showing the central dust lanes of this galaxy, comes from the NASA/ESA Hubble Space Telescope. The coloured structures near the centre are from recent ALMA observations that have revealed a spiral shape, as well as an unexpected outflow, for the first time.

NGC 1433 NGC 1433
NGC 1433 (Barred Spiral Galaxy)
(C) NASA/ESA/Hubble
NGC 1433
(C) ALMA/NASA/ESA
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NGC 1433 (Barred Spiral Galaxy) : Movie

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