The discussion revolves around the measurement of the Spectral Energy Distribution (SED) of quasars, exploring the reasons for measuring SED, the methods employed, and the implications of redshift on the observation of these distant objects. Participants also touch on the different wavelengths emitted by various astronomical objects.
The discussion contains multiple competing views and remains unresolved regarding the specifics of how different wavelengths are emitted and the implications of redshift on observations of quasars.
Participants express varying levels of understanding and seek clarification on complex concepts, indicating potential gaps in foundational knowledge that may affect the discussion.
quasarLie said:Hello,
What do you think about this article?
https://arxiv.org/abs/1502.05850
Why and how do we mesure the Spectral Energy Distribution for quasars?
Thanks
Okay thank you, and in the article they say that they choose quasars with redshift beween 1.5 and 2.2, what does it mean?? does it means that it is in the infra red?phyzguy said:I don't quite understand your question. Why do we measure the SED- because we want to learn about quasars. How - with a spectrograph.
quasarLie said:Okay thank you, and in the article they say that they choose quasars with redshift beween 1.5 and 2.2, what does it mean?? does it means that it is in the infra red?
and why some object emit in radio and other infra red or UV ?? it depends on what?phyzguy said:All distant astronomical objects are redshifted because of the expansion of the universe. See this article for an explanation. So quoting the redshift is a way of specifying how far away the quasars are. These objects are very far away and we are seeing them as they looked approximately 10 billion years ago.
quasarLie said:and why some object emit in radio and other infra red or UV ?? it depends on what?