Astronomy

Download Astrophysics for Physicists by Arnab Rai Choudhuri PDF

By Arnab Rai Choudhuri

ISBN-10: 0521815533

ISBN-13: 9780521815536

Designed for instructing astrophysics to physics scholars at complicated undergraduate or starting graduate point, this textbook additionally presents an outline of astrophysics for astrophysics graduate scholars, prior to they delve into extra really good volumes. Assuming history wisdom on the point of a physics significant, the textbook develops astrophysics from the fundamentals with no requiring any past research in astronomy or astrophysics. actual options, mathematical derivations and observational information are mixed in a balanced approach to supply a unified therapy. subject matters akin to normal relativity and plasma physics, which aren't often coated in physics classes yet used broadly in astrophysics, are built from first rules. whereas the emphasis is on constructing the basics completely, fresh vital discoveries are highlighted at each level.

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2 Radiative transfer equation If matter is present, then in general the specific intensity keeps changing as we move along a ray path. Before we consider the effect of matter, first let us find out what happens to the specific intensity in empty space as we move along a ray path. 2. Let Iν1 and Iν2 be the specific intensity of radiation in the direction of the ray path at dA1 and dA2 . We want to find out the amount of radiation passing through both dA1 and dA2 in time dt in the frequency range ν, ν + dν.

As we move further away from a source of radiation, both its intensity and angular size fall as (distance)2 . Hence the surface brightness, which is the ratio of these two, does not change. Suppose you are standing on a street in a dark night and are looking at the street lights. The lights further away would appear smaller in size, but their surfaces would appear as bright as the surfaces of nearby lights. This result has an important astronomical implication. If we neglect intergalactic extinction, then the surface brightness of a galaxy which is resolved by a telescope is independent of distance.

1 The Sun is at a distance of about 8 kpc from the galactic centre and moves around the galactic centre in a circular path with a velocity of about 220 km s−1 . Make a rough estimate of the mass of the Galaxy. 2 A star at a distance of 4 pc has an apparent magnitude 2. What is its absolute magnitude? 9 × 1026 W and has an absolute magnitude of about 5, find the luminosity of the star. 3 The Giant Metrewave Radio Telescope (GMRT) near Pune has several antennas spread over a region of size about 10 km.

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