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  #121  
Old 16-03-2016, 11:36 AM
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kinetic (Steve)
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One month on

Here is a set from last night with the DSI II cooled.
Still there but getting dimmer

Steve
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  #122  
Old 16-03-2016, 11:53 AM
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Camelopardalis (Dunk)
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Rough processing of my image from Monday night with my Canon (excuse the horrible banding)...
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  #123  
Old 21-03-2016, 12:02 PM
PeterM
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Interesting read for Hubble Space Telescope proposed follow up.
http://www.stsci.edu/hst/phase2-public/14487.pdf

Last edited by PeterM; 21-03-2016 at 12:13 PM.
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  #124  
Old 01-04-2016, 02:02 PM
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Greg Bock (Greg Bock)
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Ok, great news from the Hubble Space Telescope.
On March 19, using three images totalling 72 minutes, they found an almost complete ring which is an echo of the early SN light pulse scattered off of pre-existing interstellar material along the line of sight. It is about 5 to 6 times fainter than the SN, and bluer than the SN at very early times after explosion.

And, there may also be a brighter light echo closer to the SN, but it is too hard to tell right now due to processing residuals.

Atel here: http://www.astronomerstelegram.org/?read=8890
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  #125  
Old 01-04-2016, 02:35 PM
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strongmanmike (Michael)
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Quote:
Originally Posted by PeterM View Post
Interesting read for Hubble Space Telescope proposed follow up.
http://www.stsci.edu/hst/phase2-public/14487.pdf
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Originally Posted by Greg Bock View Post
Ok, great news from the Hubble Space Telescope.
On March 19, using three images totalling 72 minutes, they found an almost complete ring which is an echo of the early SN light pulse scattered off of pre-existing interstellar material along the line of sight. It is about 5 to 6 times fainter than the SN, and bluer than the SN at very early times after explosion.

And, there may also be a brighter light echo closer to the SN, but it is too hard to tell right now due to processing residuals.

Atel here: http://www.astronomerstelegram.org/?read=8890
Great and fascinating news boys

Seeing "Marples et al" written in there must feel pretty cool too Peter

Mike
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  #126  
Old 01-04-2016, 02:44 PM
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Greg Bock (Greg Bock)
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yes, Mike, makes all the hundreds of hours imaging and checking images very worthwhile..
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  #127  
Old 01-04-2016, 06:23 PM
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My translation of the Atel is,"we've never seen this before, but we're calling it a light pulse!".

That's awesome. So is the resolution 0.03 arcsec/pixel!

Surely you must get an all expenses paid trip to some fancy conference for this boys???

DT
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  #128  
Old 01-04-2016, 06:27 PM
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rogerg (Roger)
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Ok, great news from the Hubble Space Telescope.
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Originally Posted by DavidTrap View Post
....So is the resolution 0.03 arcsec/pixel!....
Fascinating stuff, and that resolution sure is amazing! One day we'll have that capability ....

Has anyone seen an actual image from Hubble where they deduced this information from? I'd be interested to see it.
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  #129  
Old 01-04-2016, 08:34 PM
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Thanks Mike, David and Roger.
It certainly is a wow factor to add to the discovery. I guess it means there will be a lot more follow up by professional astronomers and likely science papers will follow.
We haven't seen any images yet, though I am tempted to email Professor Ben Sugerman, but I'm sure we will see them in time.
Best
Peter

Last edited by PeterM; 01-04-2016 at 09:59 PM.
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  #130  
Old 01-04-2016, 08:49 PM
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astroron (Ron)
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On the 15th of March I was able to see it visually through my 16" scope in excellent seeing and transparency, using 3.5mm nagler plus 2x barlow 1045xmag.
Was able to hold it a number of times both with averted and direct vision.
The supernova was plainly separated from the bright star close by.
The galaxy was very close to the meridian.
Cheers
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  #131  
Old 01-04-2016, 08:57 PM
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DavidTrap (David)
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Well done Ron - an experienced set of eyes must help that!

DT
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  #132  
Old 01-04-2016, 09:23 PM
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astroron (Ron)
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Well done Ron - an experienced set of eyes must help that!

DT
Thanks David,
Seeing and transparency like that night don't come along very often,
The seeing good enough to use a 3.5 mm eyepiece is a rare beast,but to be able to use double the magnification was just exceptional.
Cheers
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  #133  
Old 01-04-2016, 10:13 PM
PeterM
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I'm really happy you saw this visually Ron.
And yes while seeing and transparency as you said don't come along that often, you have been a dedicated and exceptional visual observer for as long as I have known you so I'm not in the least surprised you nailed it visually.
Well done indeed, thanks for all the good phone chats we have and thanks for always asking about my son Tyler.
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  #134  
Old 01-04-2016, 11:03 PM
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astroron (Ron)
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I'm really happy you saw this visually Ron.
And yes while seeing and transparency as you said don't come along that often, you have been a dedicated and exceptional visual observer for as long as I have known you so I'm not in the least surprised you nailed it visually.
Well done indeed, thanks for all the good phone chats we have and thanks for always asking about my son Tyler.
Thank you Peter, it's been great knowing you for nearly 30 years.
I observed a 14.5 mag Supernova in NGC 3184 in Urser Major on the 29 last month. got to keep the eye in
Cheers
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  #135  
Old 02-04-2016, 10:04 AM
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madbadgalaxyman (Robert)
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A quick summary of the situation regarding the dust-dimming and reddening of the light of SN 2016adj in NGC 5128.....
(from the astronomical telegrams)

The extremely high Visual (V-band) extinction of an estimated 2-4 mags (see: Atel 8657) in front of this supernova causes it to be a visually very unimpressive object (= "the SN is very dimmed & reddened due to dust within the dust lane"). This supernova was measured at near V-band ("visual") magnitude 15.2 or 15.7 (very discrepant measurements!) near to its discovery date, and with an observed B-V color index of 2.1 which indicates it was an extremely red object.(the supernova is now somewhat fainter than V magnitude 17 )

The dense screen of interstellar dust within the very-large-scale Warped Dust Disk of NGC 5128 both dims and greatly reddens the light of the supernova, so this makes it tough to figure out :
- what is its intrinsic (actual) luminosity ? ("energy output")
- what is its intrinsic (actual) colour ?
An accurate estimate of extinction and reddenning from interstellar dust in the line-of-sight of the supernova will be essential in order to reduce the very large uncertainties in these two parameters.

While not at all a supernova specialist, I suspect that the great uncertainty regarding the intrinsic luminosity and color of this supernova introduces uncertainty as to its exact type.

So one of the main tasks of the pros will be to get an accurate estimate of the extinction. (there is also "foreground" extinction and reddening from dust within our own Galaxy, that also has to be taken into account)

Last edited by madbadgalaxyman; 03-04-2016 at 05:36 PM.
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  #136  
Old 03-04-2016, 08:43 AM
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andyc (Andy)
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That's pretty cool news from Hubble! Definitely looking forward to seeing the images from there...
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  #137  
Old 03-04-2016, 08:51 AM
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Atmos (Colin)
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That's quite interesting, it certainly is difficult to work out extinction when there is not any "markers" to compare against. The great thing about working out extinction of star clusters is that you have a lot of stars within a cluster to create a benchmark. Calculating the extinction caused by the Milky Way is not as difficult because we at least have that patch of sky to work with. Extinction within another galaxy, we have the supernova and thats it

This is where dealing with Type Ia supernovae are fantastic, they are considered to be standard candles because they shine with the same brightness (changes with size but it is very well modelled).
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  #138  
Old 03-04-2016, 11:50 AM
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madbadgalaxyman (Robert)
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Colin, I gave a quick reply via IIS email system, as measuring extinction is well beyond the purpose of this particular forum.
__________________________________

Here are some pickings from the internet about the Supernova in NGC 5128:

As I understand it, the latest report indicates that Supernova 2016adj is actually of type IIb, which indicates that it is caused by the collapse of the core of a massive star, rather than being caused by a white dwarf going 'critical' due to mass accretion, or due to some other cause.
(The initial reports gave a different type for this supernova.)

Type II supernovae spectra have hydrogen lines, while type I spectra have none.
There are various subypes of Type II supernova: type II-L, type II-P, IIb, and IIn.
But all type II supernovae are thought to result from the collapse of the core of a massive star.

According to information which someone quotes on the internet from Wheeler and Benetti (2007), the light curve of a type IIb supernova (somewhat confusingly) resembles the light curve of a type I supernova!

A type IIb supernova has the following
features in its spectrum:
Broad and weak H lines ; strong He I lines ;


Here is a diagram from Turatto et al., arxiv 0706.1086 , outlining the classification of supernovae:

Click image for larger version

Name:	SNe classification.jpg
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Clear as daylight, folks?

But seriously, Turatto et al. is an excellent and readable paper on the classification of supernovae.
http://arxiv.org/pdf/0706.1086.pdf
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  #139  
Old 03-04-2016, 12:20 PM
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Atmos (Colin)
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I may not have made myself over,t clear, the point I was trying to make is that the difficulty comes from it NOT being a Type 1a which are considerly easier to do calculations on.

That is a pretty neat diagram btw Type 1a are caused by white dwarfs, Type 1b&c are caused by stellar collapse.
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  #140  
Old 23-04-2016, 09:36 PM
PeterM
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This is interesting.
New ATel noting sn2016adj has the earliest ever detection of CO in a supernova - as far as the authors are aware.
http://www.astronomerstelegram.org/?read=8976
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