# What is this graph showing?

This is from the NED

What do these three titles mean?

• log fb (Jy)
• MRK 1014
• Log v (HZ)

Why is there LINE,LINE,LINE,LINE,LINE written along the bottom? What does that signify?

What are the dots and lines showing? A range of information? In that chase, what's the relevance of the dot?

Is it like this: The dot is the log v and then the horizontal line shows the range of MRK 1014 recorded for that log v and the vertical line showing the log fv recorded for it?

Why does the log v between 12 - 16.3 have small amounts of log fv and MRK 1014, but the log v between 15 - 19 have no log fv at all, but a large amount of MRK 1014. The same goes for the 2 log v points between 10.4 - 12, except these two have a large amount of log fv but no MRK 1014

Maybe if you could explain the units to me and give me links to further reading it would all become a lot clearer...

Update Okay MRK 1014 is the same of the object. (Doh!) However, what is that titless axis showing?

• NED is a terrible place to start learning astronomy. It's meant as a data source and reference for the astronomical community. I would start with an introductory astronomy text book or an introductory astronomy course online. Jul 22 '14 at 23:22
• @Aaron I fear you're right. Can you recommend a book / online source? I want to go from no knowledge to understanding the NED's data. No crazy stuff just yet, just what all the units mean. Jul 22 '14 at 23:35
• $\nu$ represents frequency in Hz (e.g. $log~\nu=12$ is $10^{12}$ Hz)
• Jy is a unit of specific flux density $f_{\nu}$ is the specific flux