What is a quasar?

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A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleusnucleus (AGN). It has been theorized that most large galaxies contain a suppermassive central black hole with mass ranging from millions to billions of solar masses. In quasars and other types of AGN, the black hole is surrounded by a gaseous accretion disk. As gas in the accretion disk falls toward the black hole, energy. is released in the form of electromagnetic radiation. This radiation can be observed across the electromagnetic spectrum at radio,infrared, visible, ultraviolet, and X-ray, and gamma wavelengths. The power radiated by quasars is enormous: the most powerful quasars have luminosities exceeding 10⁴¹ watts thousands of times greater than an ordinary large galaxy such as the Milky way.

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Q. Consider the following statements with reference to Quasars:

Which of the statements given above is/are correct?

Q. क्वसार (Quasar) के संदर्भ में निम्नलिखित कथनों पर विचार कीजिए:

ये दूरवर्ती आकाशगंगाओं में विद्यमान अत्यधिक चमकदार वस्तुएँ हैं जो रेडियो आवृत्तियों पर तरंगों का उत्सर्जन करती हैं।
ये ब्लैक होल के चारों ओर घूर्णन करती हुई सामग्री द्वारा उत्सर्जित ऊर्जा से निर्मित होते हैं।
ये केवल उन आकाशगंगाओं में पाए जाते हैं जिनमें विशालकाय ब्लैक होल होते हैं।

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