Article View: sci.astro
Article #4110Re: Quasar question
From: nather
Date: Sat, 28 Mar 1987 20:14
Date: Sat, 28 Mar 1987 20:14
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In article <877@bath63.ux63.bath.ac.uk>, cc_dgdc@bath63.ux63.bath.ac.uk (Clark) writes:
>
> Joscelyn (Bell) spotted the first quasar when doing postgrad work at
> Cambridge, England. It must have been 1965.
>
No, that was the discovery of the first PULSAR, not the first quasar.
Allan Sandage discovered that the radio source 3C48 was apparently
associated with a faint blue star with a spectrum he was unable to
decipher. Somewhat later, Cyril Hazard & colleagues observed the
occulation of the radio source 3C273 by the moon, and were able to
pin-point its position thereby. Maarten Schmidt took a spectum of it,
but, like Sandage, was unable to decipher it immediately. Some time
later he realized, quite suddenly, that it could be understood as an
object with an extreme red shift --- nearly as large as the most
distant galaxy measured, and receding from the earth at about 15%
the speed of light. Jesse Greenstein, who had a copy of Sandage's
spectrum, realized immediately that 3C48 could be explained the same
way, except that the red shift was much larger.
So you tell me: who ``discovered'' the first quasar? I know the history,
but I don't think I can answer that question.
--
Ed Nather
Astronomy Dept, U of Texas @ Austin
{allegra,ihnp4}!{noao,ut-sally}!utastro!nather
nather@astro.AS.UTEXAS.EDU
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!husc6!ut-sally!nather From: nather@ut-sally.UUCP Newsgroups: sci.astro,sci.misc Subject: Re: Quasar question Message-ID: <7611@ut-sally.UUCP> Date: Sat, 28-Mar-87 15:14:13 EST Article-I.D.: ut-sally.7611 Posted: Sat Mar 28 15:14:13 1987 Date-Received: Sun, 29-Mar-87 12:02:49 EST References: <3283@udenva.UUCP> <877@bath63.ux63.bath.ac.uk> Organization: U. Texas CS Dept., Austin, Texas Lines: 29 Keywords: When were they "discovered?" Summary: Careful ...