# Luminosity

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Catastrophe

#### vincenzosassone

Well then, you gave us the equation to calculate the luminosity of an object. The equation is important, expecially in this case, but it isn't enough to understand the limit of luminosity since the maximum temperature that an object can assume (stars, quasars, blazars, something undiscovered yet) is unknown...

We can't actually know the limits of temperature, but only the highest ridge ever meansured.

Catastrophe

#### IG2007

##### "Don't criticize what you can't understand..."
We can't actually know the limits of temperature, but only the highest ridge ever meansured.
Well, just like Einstein set the limits of speed, Planck set the limits of heat. It's called Planck temperature, it's 10-to-the-power-32 Kelvin.

Yes.

IG2007

#### Clovis

A lot of people who had, or still have a Crown Victoria, named them Vicky

#### IG2007

##### "Don't criticize what you can't understand..."
Is that a British quip I don't understand?

Catastrophe

#### Catastrophe

##### The devil is in the detail
IG, Probably something to do with Queen Victoria, Cat

IG2007

#### Pogo

Seems likely a reference to the American automobile Ford Crown Victoria, although, I fail to see the connection to this thread.

In my locale, we called it the ‘Crown Vic’.

IG2007

#### Pogo

Not necessary, Cat. Betcha we have no idea the brands and models of domestic cars and other stuff you have there; or anywhere else, for that matter.

Catastrophe

#### Catastrophe

##### The devil is in the detail
OP asked: "Is there a limit to luminosity?"

Sure there is. Higher and higher luminosity requires higher and higher temperature/energy. Higher and higher levels of anything require faster and faster levels of return to lower levels. It's entropy driven.

Cat

#### Catastrophe

##### The devil is in the detail
Anything 'highest' will be driven by entropy to a lower lever.

Cat

Lariliss

#### Lariliss

Anything 'highest' will be driven by entropy to a lower lever.

Cat
Yes.
AGN exploration is still hard and uncertain, it is dependent on the black hole to be fed. Though they are showing to be stable.

High luminosities imply high masses such that gravity can combat radiation pressure, which would otherwise blow the object apart. AGN therefore are of very high mass density, and it has long been assumed that they consist of a massive black hole, accreting the gas and dust at the center of a galaxy.
The matter probably has some angular momentum, which causes it to orbit the black hole and, through dissipation of energy, flatten to form a disk.

Matter of time (from observer point if vew, of course).

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#### Lariliss

And might be this

Catastrophe

#### Catastrophe

##### The devil is in the detail
I still maintain that any "highest", or anything "most" is subject to the levelling influence of entropy.
Apply this only (as per the question) to luminous objects.

Cat

#### vincenzosassone

Well, just like Einstein set the limits of speed, Planck set the limits of heat. It's called Planck temperature, it's 10-to-the-power-32 Kelvin.

Soooo...there is actually a maximum level!
I knew the limit of the speed, the smallest length or something else,now I don't remember, but I would have never imagined there was a limit for it.
I'm sorry

#### Catastrophe

##### The devil is in the detail
Thanks to IG2007 for supplying the reference. I worked out that there had to be a maximum temperature but could not have proved it.

Cat