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NGC 1313 (Barred Spiral Galaxy)


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NGC 1313
Barred Spiral Galaxy (棒渦巻銀河)
Gx SBcd


別名 (Other names)
Topsy Turvy Galaxy, PGC 12286, ESO 82-11, AM 0317-664

明るさ (Brightness)
9.1等級

星座 (Constellation)
レチクル座 (Ret) (Reticulum)

距離 (Distance)
1,500万光年 (15 million light-years)

NGC 1313 (Topsy Turvy Galaxy) is a barred spiral galaxy located 15 million light years from the Earth in the constellation Reticulum.

NGC 1313 (Barred Spiral Galaxy) : Picture

Topsy-Turvy Galaxy NGC 1313
The Topsy-Turvy Galaxy NGC 1313
(C) ESO
The central parts of the starburst galaxy NGC 1313. The very active state of this galaxy is very evident from the image, showing many star formation regions. A great number of supershell nebulae, that is, cocoon of gas inflated and etched by successive bursts of star formation, are visible. The green nebulosities are regions emitting in the ionised oxygen lines and may harbour clusters with very hot stars.

NGC 1313
Unusual Starburst Galaxy NGC 1313
(C) Robert Gendler
Why is this galaxy so discombobulated? Usually, galaxies this topsy-turvy result from a recent collision with a neighboring galaxy. Spiral galaxy NGC 1313, however, appears to be alone. Brightly lit with new and blue massive stars, star formation appears so rampant in NGC 1313 that it has been labeled a starburst galaxy. Strange features of NGC 1313 include that its spiral arms are lopsided and its rotational axis is not at the center of the nuclear bar. Pictured above, NGC 1313 spans about 50,000 light years and lies only about 15 million light years away toward the constellation Reticulum. Continued numerical modeling of galaxies like NGC 1313 might shed some light on its unusual nature.

Topsy Turvy Black Holes
Topsy Turvy Black Holes
(C) NASA/JPL-Caltech/IRAP
The magenta spots in this image show two black holes in the spiral galaxy called NGC 1313, or the Topsy Turvy galaxy. Both black holes belong to a class called ultraluminous X-ray sources, or ULXs. The magenta X-ray data come from NASA's Nuclear Spectroscopic Telescopic Array, and are overlaid on a visible image from the Digitized Sky Survey.

ULXs consist of black holes actively accreting, or feeding, off material drawn in from a partner star. Astronomers are trying to figure out why ULXs shine so brightly with X-rays.

NuSTAR's new high-energy X-ray data on NGC 1313 helped narrow down the masses of the black holes in the ULXs: the black hole closer to the center of the galaxy is about 70 to 100 times that of our sun. The other black hole is probably smaller, about 30 solar masses.

NGC1313
Stellar "Infant Mortality" in Spiral Galaxy NGC 1313
(C) NASA, ESA, and A. Pellerin (STScI)
[Left] - This is a view of the barred spiral galaxy NGC 1313 taken with the the European Southern Observatory's Very Large Telescope (VLT) in Chile on Dec. 16, 2003 through various broad-band (B, R, z) and narrow-band filters (H-alpha, [o I], [O III]). The color composited image was made by assigning B to the blue channel, [O I] and [O III] to the green channel, and R, z, and H-alpha to the red channel. This gives many of the nebulous shells along the outer spiral arms a yellow/red hue. The outline of the central region indicates the area observed with Hubble's Advanced Camera for Surveys.

[Right] — This is a NASA Hubble Space Telescope image of the central region of the barred spiral galaxy NGC 1313. Hubble was used to resolve stars within the galaxy to do a census of various classes of stars distributed across the galaxy. The observations show that hot blue stars (of class B) are widely scattered across the galaxy. This is evidence of "infant mortality" in which the young, so-called open clusters where stars are born, quickly became gravitationally "unglued" and scattered their resident stars into the galaxy. NGC 1313 is 50,000 light-years across and lies 14 million light-years away in the southern constellation of Reticulum.

NGC 1313 NGC 1313
NGC 1313
(C) ESO
NGC 1313
(C) Robert Gendler
Topsy Turvy Black Holes NGC1313
Topsy Turvy Black Holes
(C) NASA
Barred Spiral Galaxy NGC 1313
(C) NASA
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