Found images: 2017 July

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starsurfer
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Re: Found images: 2017 July

Postby starsurfer » Sat Jul 15, 2017 10:27 am

CG 2
http://www.capella-observatory.com/ImageHTMLs/DiffuseNebula/CG2.htm
Copyright: Ernst von Voigt and Dietmar Böcker
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ESO: Billions of New Neighbours? (RCW 38)

Postby bystander » Mon Jul 17, 2017 1:40 pm

Billions of New Neighbours?
ESO Picture of the Week | 2017 Jul 17

The objects that astronomers call brown dwarfs sit somewhere between the definition of a planet and a star. They are balls of gas with more mass than a planet, but not enough mass to sustain stable hydrogen fusion like a star. Because they hardly emit any visible light, they were only first discovered in 1995 and up until today the majority of known brown dwarfs are within 1500 light-years of us.

Now, astronomers using the NACO adaptive optics infrared camera on ESO’s Very Large Telescope have observed the star cluster RCW 38 in the constellation Vela (the Sail), about 5500 light-years away. This Picture of the Week shows the the central part of RCW 38; the inserts on the sides show a subset of the brown dwarf candidates detected within the cluster.

The scientists found half as many brown dwarfs as stars in the cluster. From these results and from studying other star clusters, the astronomers estimate that the Milky Way contains at least between 25 to 100 billion brown dwarfs. RCW 38 probably contains even more less massive, fainter brown dwarfs, which are beyond the detection limits of this image — so this new estimate could actually be a significant underestimation. Further surveys will reveal the true number of brown dwarfs lurking in the Milky Way.

viewtopic.php?t=37359#p272709
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HEIC: Dim and Diffuse (NGC 4242)

Postby bystander » Mon Jul 17, 2017 1:46 pm

Dim and Diffuse
ESA Hubble Picture of the Week | 2017 Jul 17

Tucked away in the small northern constellation of Canes Venatici (The Hunting Dogs) is the galaxy NGC 4242, shown here as seen by the NASA/ESA Hubble Space Telescope. The galaxy lies some 30 million light-years from us. At this distance from Earth, actually not all that far on a cosmic scale, NGC 4242 is visible to anyone armed with even a basic telescope (as British astronomer William Herschel found when he discovered the galaxy in 1788).

This image shows the galaxy’s bright centre and the surrounding dimmer and more diffuse “fuzz”. Despite appearing to be relatively bright in this image, studies have found that NGC 4242 is actually relatively dim (it has a moderate-to-low surface brightness and low luminosity) and also supports a low rate of star formation. The galaxy also seems to have a weak bar of stars cutting through its asymmetric centre, and a very faint and poorly-defined spiral structure throughout its disc. But if NGC 4242 is not all that remarkable, as with much of the Universe, it is still a beautiful and ethereal sight.
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Re: Found images: 2017 July

Postby starsurfer » Mon Jul 17, 2017 2:14 pm

NGC 6726-7
http://www.tvdavisastropics.com/astroimages-1_000054.htm
Copyright: Thomas Davis
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Re: Found images: 2017 July

Postby starsurfer » Mon Jul 17, 2017 2:17 pm

P Cygni nebula
http://www.cxielo.ch/gallery/f/p-cygni
Copyright: Martin Rusterholz
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Ann
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Re: ESO: Billions of New Neighbours? (RCW 38)

Postby Ann » Mon Jul 17, 2017 4:44 pm

bystander wrote:Billions of New Neighbours?
ESO Picture of the Week | 2017 Jul 17

The objects that astronomers call brown dwarfs sit somewhere between the definition of a planet and a star. They are balls of gas with more mass than a planet, but not enough mass to sustain stable hydrogen fusion like a star. Because they hardly emit any visible light, they were only first discovered in 1995 and up until today the majority of known brown dwarfs are within 1500 light-years of us.

Now, astronomers using the NACO adaptive optics infrared camera on ESO’s Very Large Telescope have observed the star cluster RCW 38 in the constellation Vela (the Sail), about 5500 light-years away. This Picture of the Week shows the the central part of RCW 38; the inserts on the sides show a subset of the brown dwarf candidates detected within the cluster.

The scientists found half as many brown dwarfs as stars in the cluster. From these results and from studying other star clusters, the astronomers estimate that the Milky Way contains at least between 25 to 100 billion brown dwarfs. RCW 38 probably contains even more less massive, fainter brown dwarfs, which are beyond the detection limits of this image — so this new estimate could actually be a significant underestimation. Further surveys will reveal the true number of brown dwarfs lurking in the Milky Way.

viewtopic.php?t=37359#p272709


I have nothing much to say about the brown dwarfs, but here is some info on the rest of RCW 38:

Scott J. Wolk, Tyler L. Bourke, Miquela Vigil wrote:

RCW~38 is a uniquely young (<1 Myr), embedded (AV∼10) stellar cluster surrounding a pair of early O stars (∼O5.5) and is one of the few regions within 2 kpc other than Orion to contain over 1000 members. X-ray and deep near-infrared observations reveal a dense cluster with over 200 X-ray sources and 400 infrared sources embedded in a diffuse hot plasma within a 1 pc diameter. The central O star has evacuated its immediate surroundings of dust, creating a wind bubble ∼0.1 pc in radius...

RCW~38 appears similar in structure to RCW~49 and M~20 but is at an earlier evolutionary phase. RCW~38 appears to be a blister compact H{\small II} region lying just inside the edge of a giant molecular cloud.


RCW 49. Credit: E. Churchwell (Univ. Wisconsin), JPL, Caltech, NASA
The Trifid Nebula. Photo: Jason Ware.






















So RCW 38 is similar to RCW 49 and the Trifid Nebula. That's interesting, I think!

And perhaps the Trifid Nebula, too, is full of brown dwarfs.

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starsurfer
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Re: Found images: 2017 July

Postby starsurfer » Tue Jul 18, 2017 8:28 am

Flaming Star Nebula (IC 405), Tadpole Nebula (IC 410) and IC 417
http://www.straightontillmorning.me/Astronomy/Nebula/Colour/i-9wpcVH7/X2
Copyright: Hytham Abu-Safieh
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Re: Found images: 2017 July

Postby starsurfer » Wed Jul 19, 2017 11:47 am

Abell 82
http://www.pbase.com/skybox/image/161687991
Copyright: Kevin Quin
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Re: Found images: 2017 July

Postby starsurfer » Thu Jul 20, 2017 12:17 pm

LBN 215
http://www.capella-observatory.com/ImageHTMLs/DiffuseNebula/LBN215.htm
Copyright: Josef Pöpsel and Stefan Binnewies
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Re: Found images: 2017 July

Postby starsurfer » Fri Jul 21, 2017 4:22 pm

IC 417
http://www.cav-sfo.com/IC417Ion.html
Copyright: Joe Mize
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Re: Found images: 2017 July

Postby starsurfer » Sat Jul 22, 2017 2:42 pm


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Re: Found images: 2017 July

Postby starsurfer » Sun Jul 23, 2017 6:16 pm

Southern Pleiades (IC 2602)
http://www.glitteringlights.com/Images/Open-and-Globular-clusters/i-22whVJ6/X3
Copyright: Marco Lorenzi
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Re: Found images: 2017 July

Postby starsurfer » Mon Jul 24, 2017 11:27 am

Abell 43
http://astrodonimaging.com/gallery/abell-43-in-oph/
Copyright: Don Goldman
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Re: Found images: 2017 July

Postby starsurfer » Mon Jul 24, 2017 11:29 am

Red Rectangle Nebula
http://www.chart32.de/index.php/component/k2/item/105
Copyright: CHART32
Processing: Bernd Flach-Wilken and Johannes Schedler

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ESO: Seeing Double (NGC 7098)

Postby bystander » Mon Jul 24, 2017 4:17 pm

Seeing Double
ESO Picture of the Week | 2017 Jul 24

Approximately 95 million light-years away, in the southern constellation of Octans (The Octant), lies NGC 7098 — an intriguing spiral galaxy with numerous sets of double features. The first of NGC 7098’s double features is a duo of distinct ring-like structures that loop around the galaxy’s hazy heart. These are NGC 7098’s spiral arms, which have wound themselves around the galaxy’s luminous core. This central region hosts a second double feature: a double bar.

NGC 7098 has also developed features known as ansae, visible as small, bright streaks at each end of the central region. Ansae are visible areas of overdensity — they commonly take looping, linear, or circular shapes, and can be found at the extremities of planetary ring systems, in nebulous clouds, and, as is the case with NGC 7098, in parts of galaxies that are packed to the brim with stars.

This image is formed from data gathered by the FOcal Reducer and low dispersion Spectrograph (FORS) instrument, installed on ESO’s Very Large Telescope at Paranal Observatory. An array of distant galaxies are also visible throughout the frame, the most prominent being the small, edge-on, spiral galaxy visible to the left of NGC 7098, known as ESO 048-G007.
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HEIC: A Cosmic Atlas (NGC 4248)

Postby bystander » Mon Jul 24, 2017 4:30 pm

A Cosmic Atlas
ESA Hubble Picture of the Week | 2017 Jul 24

This beautiful clump of glowing gas, dark dust, and glittering stars is the spiral galaxy NGC 4248, located about 24 million light-years away in the constellation of Canes Venatici (The Hunting Dogs).

This image was produced by the NASA/ESA Hubble Space Telescope as it embarked upon compiling the first Hubble ultraviolet “atlas”, for which the telescope targeted 50 nearby star-forming galaxies. A sample spanning all kinds of different morphologies, masses, and structures. Studying this sample can help us to piece together the star-formation history of the Universe.

By exploring how massive stars form and evolve within such galaxies, astronomers can learn more about how, when, and where star formation occurs, how star clusters change over time, and how the process of forming new stars is related to the properties of both the host galaxy and the surrounding interstellar medium (the “stuff” that fills the space between individual stars).

This image is formed of observations from Hubble’s Wide Field Camera 3.
Know the quiet place within your heart and touch the rainbow of possibility; be
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Ann
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Re: HEIC: A Cosmic Atlas (NGC 4248)

Postby Ann » Mon Jul 24, 2017 5:35 pm

bystander wrote:A Cosmic Atlas
ESA Hubble Picture of the Week | 2017 Jul 24

This beautiful clump of glowing gas, dark dust, and glittering stars is the spiral galaxy NGC 4248, located about 24 million light-years away in the constellation of Canes Venatici (The Hunting Dogs).

This image was produced by the NASA/ESA Hubble Space Telescope as it embarked upon compiling the first Hubble ultraviolet “atlas”, for which the telescope targeted 50 nearby star-forming galaxies. A sample spanning all kinds of different morphologies, masses, and structures. Studying this sample can help us to piece together the star-formation history of the Universe.

By exploring how massive stars form and evolve within such galaxies, astronomers can learn more about how, when, and where star formation occurs, how star clusters change over time, and how the process of forming new stars is related to the properties of both the host galaxy and the surrounding interstellar medium (the “stuff” that fills the space between individual stars).

This image is formed of observations from Hubble’s Wide Field Camera 3.


M106 with companion NGC 4248 (bottom right).
Photo: R Jay GaBany.
It's so small!!! :shock:

NGC 4248 is a satellite of large spiral galaxy M106. Look how tiny NGC 4248 is!

NGC 4248, gri image.
Photo: SDSS.





















The Large Magellanic Cloud for comparison.
Photo: Wei-Hao Wang.





NGC 4248 isn't profusely blue. Its B-V index is 0.590, which isn't that much bluer than the B-V index of big bully galaxy M106 (0.690). NGC 4248 is no Large Magellanic Cloud! And that's not so much because the B-V of LMC is so much bluer than the B-V of NGC 4248, but because the LMC is shining and sparkling with pink emission nebulas and star formation. There is nowhere near as much of that in NGC 4248 as in the LMC. Look at the SDSS gri image of NGC 4248. In gri images, hydrogen alpha emission (that is, red hydrogen emission) is shown as green. There is one obvious spot of green in the dust lane of NGC 4248, so there is one very definite emission nebula there. That's not a lot, although it is so much more than the satellites of big bad Andromeda galaxy can show for themselves!

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