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ESA Hubble site for Ngc 2903 SEDS Hubble site for Ngc 2903 GIC page for Hubble images |
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A study of Ngc 2903 details reveals details of galaxies at large.
Ngc 2903 is a seriously disrupted galaxy which has experienced a foamy cheese cutting sideswipe along its left flank and also seems fully engaged in a merger.
Intense chaotic roil marks the whole left escarpment. Nothing of the intensity of the roiling flank is seen in a Hubble composite original from which the following bright colored enhancements were made. The Hubble portion was turned down by astronomers to show it fit within a Dss larger image which itself was very dim. Brighter Dss views are shown here.
Another Hubble original has some of the roil filled in with blue color tones, which also enhances to show more of the roil.
Next is a sequency of enhanced 3D pairs (and singles) among other things showing a huge angle edged cavitous cleavage indenting the roil to the right of the bright yellow small core.
The strands wanding off in a deep seawall to the underleft are layered and drop down vertically deep. A smooth oval to the far left in the underlayer seems from some time ago not recent. Similar ovals, called snubs, are modelled by the upper left flank of Bodes galaxy. Long length vertically stacked striations from a sideswipe collision are well exampled by Andromeda.
In the above views, the small wisps and clumps of hot new blue stars, are fast travelling residuals spooing out of the galaxy, like fruit flies booing out of the kitchen composter breader reactor. Spoos when leaving noticable tracks from their travels, can be called intruders.
Next, a crunch blunts the end of the central core deck. Seen in enhanced Dss views next, the crunch is cavitously seen in great detail in the opening two bright color views (rotated in a different alignment) above.
If a full color serious image turns up in which the colors in the arm branching upward to the left from the crunch are different than colors in the arm branching up to the right, it will mean that each arm, left and right, is from a different original galaxy.
Since the original Dss image resolution was not very good, a sequence of 4 different views in various stages of enhancement have been shown in stereo above, each view revealing different important details all pointing to collision including the blunt nose (lower center) which looks to be a sawed off arm stub. Blunt arm stubs are not unique, one is noticable in Ngc 5236 featured here 1 and here 2. Another sawed off arm in a central feature demonstrating a current collision status in galaxy Ngc 3314.
NEXT - ENHANCED DSS IMAGE SHOWING EXTENSIVE OUTER AREA SUPERSTRUCTURE
At the far upper end, a sweeper arm emerges under extreme levels of enhancement (extreme means it won't enhance no further cough ahem). Look to the thin left outer edge of the sweeper, another arm, very thin, and brighter, pops out of a fumarole and continues brightly along the outer upper left helm of the sweeper.
A fumarole means a portal where one arm emerges from another. Portals are usually round. A larger oval fumarole is more clearly seen further down where the main sweeper arm emerges from the underside of the major galaxy core deck.
Regarding low radiance above Ngc 2903, (see above images), this means conciderable dynamics are going on within the whole upper area out in the sweeper arm which seems merely dim and uninteresting in the region filling the whole area above the central bright plateau, but, seething dynamics are likely there which we cannot see since dully glowing low luminant matter is either obscuring it, or the structures out there themselves are radiating in only very low luminance as if 'dark galaxy' material.
Giant spiral galaxy M101 has conciderable extends of 'dark galaxy' low radiant matter extending beyond its normally seen outer reaches. See more on M101. Warning - this 'more' page contains big images, long load.
At least 4 fumarole arms are seen issuing from portals. Any fumarole arm issuing in a galaxy is a sure tell-tale sign of former collision with some degree of merger.
It seems Ngc 2903 is not a bright galaxy. This Dss 2nd generation image (black and white images immediately above and below) shows a rather dull two-arm object with vague hints of more, sweeping around into the outskirts. Attempts at enhancement by a moi have exposed some of the sweeping outskirt formations but not brightly, and the inner portion is more exposed but not in any pristine detail, and, the inner portion suffers ruinous whiteout in the enhancement.
HUBBLE IMAGE
Hubble telescope has peered into the underwear of Ngc 2903 and come up with the following interspection. The interspection is puzzling because most of the content in the image is missing, probably by an astronomer compositing a drastically turned down Hubble view in context of a drastically faint Dss view. No offence intended but it would have been more to the point to have turned up the Dss image instead of the other way around in seeking a composite compromise where both image sources are brighter and more colorful.
As it is, a poorly detailed core shelf is profiled in the widely circulated composite, everything including color portions are dim and indistinct. Some happy rubbing of hands getting ready to enhance, then enhance, shows far more of the overall, which is that this is a v e r r r y thick galaxy with hidden and missing mass in abundance, probably 1 if not 2 orders of magnitude more missing mass in abundance, if this composite image in original view is all an onlooker ever sees of galaxy Ngc 2903. It fooled me, I did not see the brighter Hubble sourced views until several days after working over the composite view, metaphorical hands rubbing gleefully together.
Ngc 2903 is a much larger galaxy than the portion shown as backdrop (grey) in the astronomer's dull composite above, the composite shows a strip through the center escarpment and the Hubble part in total comprises only the central area shown in the colored squares within in a Dss image, above in composite mutually enhanced and colored by a moi.
NGC SUPERSTRUCTURE REVISITED
There seems 'proof' that collision has formed the present shape. In this image shown further above a thin vestiginous arm extends north off the end of the hard long 'bar' core but, this 'arm' is polar planed at right angles to the large sweeper arm arcing in a rooster tail at long distance over the north pole. This vestiginous arm, being so anomalous in polar plane, is certain to be a remain of another spiral galaxy's original motherhood.
(Polar plane means the tilt angle relative to reference objects nearby, such as the larger arcing outer sweeper of an arm from another original spiral galaxy ??? - I use question marks because I cannot guarantee unconditionally that such interpretation is correct, but, can see no other interpretation, ie that Ngc 2903 is a merger of at least two spiral galaxies - GM)
Also, the shattered quarterdeck is actually a 'tympanic' formation - a straight-edged cleft in a six sided setting. 'Tympany's' and 'tympani resonators occur as major forms in galaxy collisions.
This incised cavity is rudimentary (in having indisctinct straight edges). You MUST see these views in 3d - overlay each image pair together by eyesight to see the 3d. Even if you disagree that 3D is impossible in a long distance astronomy image, notice how much small salient details instantly improve when doing the overlay. It is these small salient details that tell you more than anything else how a galaxy or a galaxy formed object is constructed.
(You may have sensed that I am packing this Ngc 2903 galaxy file with 'more' from the school of galaxy lore. This is true. It is being done because Ngc 2903, a poorly studied galaxy except for a few better views from Hubble of only a small piece of the galaxy - not correctly interpreted - has a great deal to reveal. Enjoy the galaxy 'more' you are finding in this file. The 'more' reaches out one way or another to any other galaxy you may want to study, so I am packing it, you better believe, hands rubbing vigorously together).
DSS 2ND GENERATION IMAGE REFERENCE
Here is the colored portion as profiled by Hubble, enlarged, showing more overall detail than in the Hubble composite whose emphasis is the stretch along an internal escarpment in the galaxy. The amount of polar plane breakup (right angles meeting) in shelved layers especially at the lower right foot, hints without question that collision(s) have been involved in this galaxy's present day evolution.
The evidence and clues are not sufficient to say who hit whom, nor what did when to where. The long bright extension through the core (which has caused this galaxy to be designated a bar galaxy, which it is not), is a core dynamic stretched by collision tensions such as found in Ngc 5236.
To continue, here is the whole core deck inner bright area, enhanced from a Dss image. Blurry it is and doesn't seem to want to get any better. These next are the best I can do, despite hand wringing.
This odd looking image from this source is the inner portion, showing what the source caption terms a puzzling abundance of new globular clusters. Collision explains in 1/10th of a second flat why new actived globular clusters would exist, in the aftermath of clashing titans galactically speaking.
SUMMARY
Hubble's looks at Ngc 2903 on overlay with a Dss backdrop image.
High gamma correction enhancement reveals that there is an abrupt cutoff in media along the lower edge of the body, image compositor(s) concidering any content in the extension of the lower hem as inconsequential.
But consequential it is, the lower hem actually continues in dim drifts a long way out into deep space to the lower left. But, the analysis is apropos only to the dim Hubble composited on grey Dss image.
Ngc 2903 is a spiral galaxy with a very long outreach in its superform, the outreach in the form of two very long whimsy arms arcing out to long distance in opposite directions and on alternative polar planes from the central dish plateau.
The illusion of a 'bar' is because the 'bar' is actually a sharp escarpment shelf jutting foreward along the galaxy's leading lower edge which lines the inner dish plateau, and chance alignment to our point of view in perspective has us seeing along the leading edge of the escarpment creating the illusion of a 'bar' when seen in 2D, the illusion vanishes when the image is seen in virtual 3D (superimpose two side by side images together to see the 3D.
A 2nd generation (red) Dss image of Ngc 2903 shows a long axis tranversally through the center crossing arms on a south-east vector. Also, (too bad so blurry), other violent-rend features are seen amongst the inner arms not seen in the Dss 2nd generation (blue) image used in all of the above black and white images. The (red) generation features are too blurry to pursue with confidence.
testsite
OTHER 'BAR' GALAXIES SHOW COLLISION 'ESCARPMENT'
Some so-called 'bar' galaxies are merely normal galaxies, but, have collision 'escarpments' seen on edge, creating an illusion of mysterious 'bars' through their centers which are not really 'bars', not really mysterious.
In GIC, 'escarpment' galaxies studied include Ngc 3079, and Ngc 4945, and of course Ngc 2903.
Ngc 3079 and Ngc 4945 are two on-edge galaxies whose central plane 'escarpments' are darker, rather than brighter. Given re-factoring their images to show the 'escparments' as 'bright', both galaxies would immediately transform into the usual 'bar galaxies', just by their appearance in re-factored image form.
If yo-yo galaxy (name unknown) happened to be rotated the right side facing us a little more, the central twin thin bright arms would appear as a bar housed in a very large outer superstructure of winding long distance arms.
Have a look at Triangulum galaxy, with eyeglasses askew. If rotated so that the long straight edge down the left side (caused by a sideswipe collision) lifted up to now cross the middle, this galaxy would undoubtedly look like it has a 'bar' through its center.
Even Ngc 1365, re-oriented the right way, would be the classic mid-center thin bar version with long outer winding dim 'dark galaxy' arms, rather than the thick central axis 'bar' galaxy version we see today.
SO - WHAT ARE 'THIN CENTRAL BAR' GALAXIES ?
Basically, what you have is a very bright inner small core deck, seen partially or well on edge, causing a bright line to cross the face of the core deck so seeming to be a 'bar' crossing the inner core, surrounded by a very large outer superstructure in the form of long winding spiral arms composed of dimly radiating 'dark galaxy' matter.
Many so called 'bar' galaxies have a thin line indicating a side view of a bright core deck with an 'escarpment' facing us. Is it possible that the long thin cores in spindle galaxies shown in GIC are 'escarpment' (thin edge-on) core decks.
Here is a quick show 'n tell of galaxies with 'escarpments, all picked at random from this Noao Outreach site.
Image 1 5248-003.jif Image 4 1073-002.jif
Image 2 1300-004.jif Image 5 1300-005.jif
Image 3 3359-003.jif Image 6 7771-003.jif
Click for related 'eye in the sky' class galaxy studies, featuring Ngc 6782.
Add to the GIC collection of 'bar' class galaxies, Ngc 1512, which is also famous in GIC for being centerpoint in a fabulous meandering gravity wave formation called the 'Edge'.
Web site/display/designs/image enhancements - Greydon Moore World's largest cosmic teaching site - Ottawa 2001/2004 form A & O 3 3
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