MPE, Garching, Germany &Oxford University, U.K.

Seyfert 1 and 2)

QSO

Blazarsjet

Seyfert

Jet

SeyfertSeyfert

Karl SeyfertKarl SeyfertSeyfert

Seyfert 1Seyfert 1: km/sSeyfertSeyfertkm/s

Seyfert 2

Seyfert 1

~ 1 parsec

NLR

H

Cygnus-A

O

x

jet 6500

Doppler:km/sec

M = G 2

R

c

Maarten Schmidt C

QUASARQUASAR

3C273

zz

3C273

BL Lacertae BL Lac BL Lacertae BL Lac

Seyfert 2

Seyfert 1

Radio jet

dusty torus

H Seyfert, QSO

E

STARBURSTSSTARBURSTS

2.5

5.0

7.5

10.0

12.5

12.8012.8412.88

line

flu

x (J

y)

0

4

8

12

14.2814.3214.3614.400

4

8

12

7.635 7.6750

4

8

12

15.5415.5815.62

wavelength ( m )

SWS

Ne+ Ne++ Ne 4+ Ne5+

0.5

1.0

1.5

80 120 160

wavelength (m)

flux

0

1

2

3

4

7 9 11

PAH

wavelength (m)

flux

den

sity

(Jy

)

ISOPHOTLWS