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Exercise 10

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      Exercise 10

In  http:://gbm.bo.astro.it/paola/didattica/AA2012­

2013/statistica/data  are stored 2 files (the modified is The version which can be used in IDL).

The original one has been taken from Hyperleda (

http://leda.univ­lyon1.fr/) with the following prescriptions: apparent  B magnitude (btc) available

and radial velocity (vvir) between 2000 and 10 000 km/s.

Write a idl procedure showing the histogram of M_B

(absolute B magnitude) for different morphological types

(Ellipticals, S0s, Sa­Sbc and Sc­Irr), computing mean and standard  deviation and fitting the best gaussian to these data.

To import data from a file   use        E<= ­3

data=fltarr(3,88600)      S0  > ­ 3 & <0

openr,1,'modifiedsample.dat'        Sa­Sbc >= 0 & < 4 readf,1,data      Sc ecc  >= 4

close,1

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