LMC + SMC - looks like there may have been a collision between the two. Could the LMC actually be a spiral galaxy? Full spectrum modded 6D, Siggy 35mm f1.4 at f2.2, ISO1600, 20s,60s & 180s, on lens vis+Ha (Spencer's).
I haven't seen them before either. I was nearly going to dismiss them as cloud bombs, but they showed up in shots from 3 different astro shoots. Couldn't find anything on the internet either. I always thought the LMC & SMC were elliptical galaxies.
Nice work there Cazza,
I do recall reading somewhere that the LMC is classified as a Barred Spiral which surprised me but can't recall where at the moment.
PS. Just checked it was in Sky Safari Pro on the iPad that refers to it as a Spiral Galaxy
Not unknown to professionals, but I don't think I've seen many amateur images of this structure called the Magellanic Stream. Extremely faint. You must have shooting from an extremely dark site.
LMC + SMC - looks like there may have been a collision between the two. Could the LMC actually be a spiral galaxy? Full spectrum modded 6D, Siggy 35mm f1.4 at f2.2, ISO1600, 20s,60s & 180s, on lens vis+Ha (Spencer's).
Hi Troy,
Indeed LMC is a barred (peculiar) spiral galaxy and its spiral structure was confirmed by Shapley in 1931. In one of the early papers - "Studies of the Magellanic Clouds", De Vaucouleurs (1955) noted the faint 20-degree long filament stretching out of the LMC (see Plate II in the paper). De Vaucouleurs estimated the luminosity of this filament at 25/26 mag/arcsec^2 - rather faint. I overlaid your inverted and stretched mage with the Plate II from the paper and the long LMC streamer does match. Proper calibration would improve your data, but some of that faint stuff is indeed real. I attached a small animated gif and larger version is here: https://dl.dropboxusercontent.com/u/...ouds140326.gif
Trying to find out about the possible collision between LMC and SMC I came across this paper by Heller and Rohlfs (1994) where they model orbits of LMC and SMC and suggest that a close collision between the two occurred about 500 Million years ago. Later studies suggest an off center, moderate to highly-inclined collision between the SMC and the LMC's disk that took place between 100 and 200 Million years ago (Casetti-Dinescu et al. 2012).
Given what Alex has done there Troy it looks like your data is relatively sound, in fact I think you have revealed more extensions and more detail than the Aero Ekta lens did. The individual circular frames of old B&W film data look to have suffered from vignetting and thus without the modern technique of flats available to them and after mozaicing the circular frames together the faint extensions are probably not complete..?
Nice work and another example of why THIS may well not make me a deluded emperor
LMC + SMC - looks like there may have been a collision between the two. Could the LMC actually be a spiral galaxy? Full spectrum modded 6D, Siggy 35mm f1.4 at f2.2, ISO1600, 20s,60s & 180s, on lens vis+Ha (Spencer's).
Wow - cheers, thank you Alex! Interesting info too.
Quote:
Originally Posted by alexch
Hi Troy,
Indeed LMC is a barred (peculiar) spiral galaxy and its spiral structure was confirmed by Shapley in 1931. In one of the early papers - "Studies of the Magellanic Clouds", De Vaucouleurs (1955) noted the faint 20-degree long filament stretching out of the LMC (see Plate II in the paper). De Vaucouleurs estimated the luminosity of this filament at 25/26 mag/arcsec^2 - rather faint. I overlaid your inverted and stretched mage with the Plate II from the paper and the long LMC streamer does match. Proper calibration would improve your data, but some of that faint stuff is indeed real. I attached a small animated gif and larger version is here: https://dl.dropboxusercontent.com/u/...ouds140326.gif
Trying to find out about the possible collision between LMC and SMC I came across this paper by Heller and Rohlfs (1994) where they model orbits of LMC and SMC and suggest that a close collision between the two occurred about 500 Million years ago. Later studies suggest an off center, moderate to highly-inclined collision between the SMC and the LMC's disk that took place between 100 and 200 Million years ago (Casetti-Dinescu et al. 2012).
Thanks Mike, atalas, ZeroID, Octane, dvj, alpal and Nico13. 4x180s, 4x60s and 4x20s subs, 35mm, f2.2, ISO1600.
Quote:
Originally Posted by strongmanmike
Given what Alex has done there Troy it looks like your data is relatively sound, in fact I think you have revealed more extensions and more detail than the Aero Ekta lens did. The individual circular frames of old B&W film data look to have suffered from vignetting and thus without the modern technique of flats available to them and after mozaicing the circular frames together the faint extensions are probably not complete..?
Nice work and another example of why THIS may well not make me a deluded emperor
MIke
Quote:
Originally Posted by atalas
I'm sure Ive seen the tidal tale somewhere before but still very nice Pic.
Quote:
Originally Posted by ZeroID
Fascinating and stunning image. What was total exposure time ?
Quote:
Originally Posted by Octane
I can't remember who it was, but, someone from Perth posted images about 5 years ago showing the same tidal stream structure, too.
It only shows up in deep exposures.
Beautiful stuff.
H
Quote:
Originally Posted by dvj
Not unknown to professionals, but I don't think I've seen many amateur images of this structure called the Magellanic Stream. Extremely faint. You must have shooting from an extremely dark site.
Nice work there Cazza,
I do recall reading somewhere that the LMC is classified as a Barred Spiral which surprised me but can't recall where at the moment.
PS. Just checked it was in Sky Safari Pro on the iPad that refers to it as a Spiral Galaxy
As mentioned by Ron, we are discussing the structure and history of the LMC in the "Observation reports" forum.
I have just posted a link to a slide presentation on the nature of Magellanic Spiral galaxies (= the Hubble type SBd), which is the accepted galaxy classification of the LMC.
I have also given some more information in my recent post about the general structure of the LMC .
Indeed LMC is a barred (peculiar) spiral galaxy and its spiral structure was confirmed by Shapley in 1931. In one of the early papers - "Studies of the Magellanic Clouds", De Vaucouleurs (1955) noted the faint 20-degree long filament stretching out of the LMC
came across this paper by Heller and Rohlfs (1994) where they model orbits of LMC and SMC and suggest that a close collision between the two occurred about 500 Million years ago. Later studies suggest an off center, moderate to highly-inclined collision between the SMC and the LMC's disk that took place between 100 and 200 Million years ago (Casetti-Dinescu et al. 2012).
Get ready to expand your brain drastically, as the information content here is absolutely massive!
I think many of these are pretty hard papers...... certainly much tougher to read than the early papers written in the 1950s to 1970s on the two magellanic clouds.
Impressive image Troy and nicely processed. A surprising result given the relatively short exposure times. I hadn't recorded anything obvious on previous attempts at this but clearly I'll have to give it another go with the newer gear. You've composed the two clouds very nicely as well.
