Quote:
Originally Posted by Nereid
Thank you.
"[...] to include in the initial sample." (emphasis added)
* how many samples will the test involve?
* to what extent will the selection of samples after the initial one be determined by the results of one or more analyses on the initial sample?
|
Sorry, I had intended to deal with this in the same post and forgot.
Th initial sample meant the galaxies and quasars eligible by way of magnitude and redshift to be in the sample. The final sample was to include only those that were sufficiently close to each other to qualify as pairs. That means being within (100 kpc or) 150 kpc at the distance of the galaxy.
Quote:
"Galaxy classification to include all types of spirals, exclude all other types."
* how will galaxies be classified?
* why are spirals the only galaxies to be included?
|
I propose to use a catalog that has classifications and to accept those. Any classification with "Spiral" in its name would be accepted. The reason is simply that Arp has claimed that quasars are ejected from spiral galaxies along the axis. Therefore that must be the basis of a test for whether he is right or not.
Quote:
"dist_G_Q = distance limit set for true association of galaxy and quasar in alternative cosmology. This will be around 100 kpc (maximum 150 kpc)."
* how will distances be estimated?
* why "around 100 kpc (maximum 150 kpc)"?
|
The distance will be based on an accepted estimate of the Hubble constant (say 71 km/s/Mpc) and the redshift of the galaxy. You know the formula. :-)
That distance is a reasonable upper limit for quasars if they are ejected from galaxies. The typical distance is found to be 50 kpc on the projected line of sight. So I was inclined to use 100 kpc, but seeing that other researchers have used 150 kpc, that is also acceptable.
Quote:
"The z limits will need to be set based on probabilities that depend on the particular catalog(s) used [...]"
* how, explicitly and in detail, will "the z limits [...] be set"?
* specifically, to what extent will "the probability of line of sight coincidences" be calculated ab initio?
|
The line of sight coincidences can be set by combining the area of the sky that the chosen distance covers (square degrees or square minutes or whatever) as a fraction of the total sky in the sample with the number of objects that are initially selected. If for example there are 50,000 galaxies and 10,000 quasars initially selected and the region of 150 kpc around each galaxy covers 0.001% of the sky (this will depend on the average redshift so can be modified if need be) in the catalog then we expect about 0.1 quasars per galaxy to be within that region. Such a result is acceptable, being less than 1. That should lead to something of the order of a few thousand pairs, an acceptable result.
Of course I have ignored that even in the big bang there is supposed to be some slight lensing effects. But while this does affect the number of coincidences it does not affect the brightness of the quasar in relation to the galaxy redshift by an amount that could materially alter the scatter diagram in the way that would need to happen if Arp is right.
Quote:
"it is established that the definition of quasar is compatible with that used in Arp (and any other) papers that showed galaxy-quasar associations"
* how will this be established?
|
Maybe some astronomers can help me here.
Quote:
Some minor clarifications:
* what are "c" and "H" in the formula "(dist_G_Q/c/z*H)^2/4/pi"?
* is "Z" a typo for "z" in "Z can be substituted by z_G_min to check [...]"? If not, what is it?
|
c is the speed of light
H is the Hubble constant
yes, Z was meant to be z