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Exercise 11

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      Exercise 11

Using the data included in modifiedsample.dat  plot M_B as a function of radial velocity for the 4 

morphological classes defined in Exercise 10 and overplot on  each plot some curves representing M_B as a function of 

radial velocity for some assigned limit in m_B.

With the aid of these curves establish a reasonable m_B limit 

for  each class.

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      Exercise 12

       The Tully­Fisher relation.

All galaxies having t>0 (i.e. Spirals),   v_r >2000 km 

and v_r < 10 000 km/s maximum rotation velocity (v_rot),  

apparent B magnitude (btc) and inclination (inc)  measured  have been extracted from Hyperleda and are included in the  file tullyfisherall.dat.

The file tullyfishermodified.dat is the modified version 

(readable in IDL). Use this latter one to derive the T­F relation 1) for the whole sample

2) for Searly and Slate separately.

3) Find out a possible effect (if present) on the relation  induced by luminosity difference

4) Check for an effect induced by inclination 

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