What is the highest redshift object ever observed in the universe?

[Chaos' lil bro Order]

Hi, what is the highest redshift observed for any 'object' in the Universe?

Also, is the Abell-lensed 'object' still viewed as a possible candidate (at Z=10) or have people further studied this lensed 'object' and determined its high redshift as an error?

Thanks you.

 

[SpaceTiger]

Hi, what is the highest redshift observed for any 'object' in the Universe?

See here:

https://www.physicsforums.com/showthread.php?t=113862&page=4"

In particular, post #55.

Also, is the Abell-lensed 'object' still viewed as a possible candidate (at Z=10) or have people further studied this lensed 'object' and determined its high redshift as an error?

It looks to be bogus:

http://xxx.arxiv.org/abs/astro-ph/0601181"

 

[matt.o]

well, technically the highest redshift 'object' oberved thus far is the CMB at z~1100.

As for the z=10 galaxy, I believe I already answered this in this post in another thread:https://www.physicsforums.com/showpost.php?p=936972&postcount=11"

The NED link you refenced in that thread provided 4 references, 1 of which found no evidence of a detection of the z=10 in the H-waveband (where Pello detected it) and the other reanalysed the origional data and failed to detect the line used in the origional analysis to determine a redshift.

 

[SpaceTiger]

well, technically the highest redshift 'object' oberved thus far is the CMB at z~1100.

This is certainly true, though in my experience, that's usually not what people mean. The surface of last scattering can be seen in all directions and doesn't, IMO, constitute a single coherent "object". Chaos, do you understand what the CMB really is and why it might or might not be called the object with the highest redshift?

 

[matt.o]

This is certainly true, though in my experience, that's usually not what people mean. The surface of last scattering can be seen in all directions and doesn't, IMO, constitute a single coherent "object".

True. I was just being smart! I think I remember Charley Lineweaver saying in one of his talks "Those galaxy guys get excited about obseving galaxies at z=7, well that's nothing. I observe the CMB at redshift 1100!" or something along those lines.

 

[SpaceTiger]

True. I was just being smart! I think I remember Charley Lineweaver saying in one of his talks "Those galaxy guys get excited about obseving galaxies at z=7, well that's nothing. I observe the CMB at redshift 1100!" or something along those lines.

Yeah, I know what you mean, but I think it really is a good thing for people to keep in mind, particularly when considering the Big Bang Theory. If we really couldn't observe anything past z=7, cosmological theory would be working from a much narrower baseline and there might still be genuine reason to question the expanding universe...

Probably not, though.

 

[Chaos' lil bro Order]

Yes, I understand the CMB has been redshifted from ~1000nm (3000K) to ~1mm (~2.75K), if memory serves me. Wasn't it released around 380,000LY post BB? And the polarizations in it were left by the Reionization Period?

 

[Chaos' lil bro Order]

Ok, matt.O, so the z-10 object was falsified, gotcha. CMB is an object? Naw, but a funny joke of a concept.

 

[SpaceTiger]

And the polarizations in it were left by the Reionization Period?

Some of the polarization comes from reionization, though much was made at the surface of last scattering (z~1100). We can measure a power spectrum of the polarization anisotropies just like with the temperature and both show multi-peaked structure coming from oscillations in the early universe.

 

[Chaos' lil bro Order]

Some of the polarization comes from reionization, though much was made at the surface of last scattering (z~1100). We can measure a power spectrum of the polarization anisotropies just like with the temperature and both show multi-peaked structure coming from oscillations in the early universe.

Are you referring to the 1 degree inhomogenities in the WMAP data?

 

[SpaceTiger]

Are you referring to the 1 degree inhomogenities in the WMAP data?

The first acoustic peak is at about one degree, but there are two others at smaller angular scales. The inhomogeneities in polarization caused by reionization are at much larger angular scales (>~20 degrees).