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Harel Boren | all galleries >> Other Objects > NGC 6357: Cathedral amidst raging waves of fire
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NGC 6357: Cathedral amidst raging waves of fire
August 18, 2012 Harel Boren

NGC 6357: Cathedral amidst raging waves of fire

Tivoli Farm, Kalahari Desert, Namibia

SBIG ST8300M, Astrodon filters: RGB E-Series GenII Ha 5nm
Ha(HaR)GBL Total 4:00 hours = Ha 90 min. [18x5 min] L 90 min. [18x5 min]+ R,G,B [4x5 min. each]
2.8-8 CF (Carbon Fiber) Powernewt OTA
Fornax mount, guided

This image is 1876x1247 pixels

Massive stars lie within NGC 6357, the central part of which is shown in the very middle of this image. That central region spans about 10 light years and the whole expansive complex lies about 8,000 light years away in the tail of the constellation Scorpius.

In fact, positioned just below center in this view of NGC 6357, star cluster Pismis 24 includes some of the most massive stars known in the galaxy, stars with over 100 times the mass of the Sun. The nebula's bright central region also contains dusty pillars of molecular gas, likely hiding massive protostars from the prying eyes of optical instruments. The intricate patterns are caused by complex interactions between interstellar winds, radiation pressures, magnetic fields, and gravity. The overall glow of the nebula results from the emission of light from ionized hydrogen gas (ref. http://apod.nasa.gov/apod/ap081009.html; http://apod.nasa.gov/apod/ap101121.html).

The unusual name of “War and Peace” was given to this nebula not because of the famous novel by Tolstoy, but was given to this object by scientists working on the Midcourse Space Experiment (see: http://en.wikipedia.org/wiki/Midcourse_Space_Experiment). They noted that the bright, western part of the nebula resembled a dove, while the eastern part looked like a skull in their infrared images. Unfortunately this effect cannot be seen in the visible-light image presented here. The object is also occasionally nicknamed the Lobster Nebula (ref. http://asterisk.apod.com/viewtopic.php?f=29&t=28928).

NGC 6357 was first recorded visually by John Herschel from South Africa in 1837. He only recorded the brightest central parts and the full scale of this huge nebula was only seen in photographs much later.

I've taken the name as a variation on the NASA APOD of Nov. 18th http://apod.nasa.gov/apod/ap121118.html)

It's actually a re-do and re-frame of an image I posted here some two months ago http://www.pbase.com/boren/image/146391038), shot from the Kalahari desert, Namibia, this August. While the former was a zoomed-out wide field, this one takes a close look at the raging Ha waves circling the Cathedral to Massive Stars ...


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