Observing a Body at z=6: Calculating Photon Requirements

  • Thread starter Thread starter wolram
  • Start date Start date
  • Tags Tags
    Body Photon
AI Thread Summary
The discussion centers on the photon requirements for observing a body at redshift z=6. It clarifies that the number of photons needed is influenced by various factors, including the observational instrument, background noise, the object's color, and the frequency of observation, rather than solely the redshift itself. Participants emphasize the need for specificity in the question to provide accurate calculations. Understanding these variables is crucial for determining the photon count necessary for effective observation or measurement of redshift. Overall, precise conditions and parameters are essential for accurate photon requirement assessments.
wolram
Gold Member
Dearly Missed
Messages
4,410
Reaction score
555
How many photons are needed to (obsreve) a body at z=6 ?
 
Space news on Phys.org
Do you mean how many photons must be detected to observe a body at z=6? Or do you mean how many photons are needed to measure the redshift of a body at z=6?
 
The number of photons needed to observe an object (spectroscopically or otherwise) depends not on its redshift, but on the instrument used, the backgrounds and foregrounds, the object's color, the frequency of observation, etc. You'll need to be more specific.
 
This would be an example.


http://www.citebase.org/cgi-bin/citations?id=oai:arXiv.org:astro-ph/0303424
 
Last edited by a moderator:

Thread 'Illuminating Black Hole Shadows with Dark Matter Annihilation'

Abstract The Event Horizon Telescope (EHT) has significantly advanced our ability to study black holes, achieving unprecedented spatial resolution and revealing horizon-scale structures. Notably, these observations feature a distinctive dark shadow—primarily arising from faint jet emissions—surrounded by a bright photon ring. Anticipated upgrades of the EHT promise substantial improvements in dynamic range, enabling deeper exploration of low-background regions, particularly the inner shadow...
View full post »

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Similar threads

B Matter density right after the decoupling
Replies
13
Views
380
I Limitations of Observing Distant Space Objects
Replies
38
Views
4K
I Seeking reference for math related to the age of Recombination
Replies
3
Views
2K
I How Does a CMB Photon Travel Through Expanding Universe?
Replies
39
Views
5K
I Is the supply of the observable CMB radiation limited?
2
Replies
50
Views
4K
A Photon speed for an observer at the photon sphere
Replies
3
Views
1K
Inflation and measurement of cosmic bodies
Replies
2
Views
2K
I Some questions about Cosmic Microwave Background radiation
Replies
13
Views
6K
A Late Photons from the Early Universe?
Replies
1
Views
2K
A Relativistic Redshift and understanding it's approximation
Replies
4
Views
1K

Hot Threads

Recent Insights

Back
Top