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From: wyatt@cfa.UUCP (Bill Wyatt)
Newsgroups: net.space
Subject: Re: The soap-bubble theory of galaxy formation
Message-ID: <165@cfa.UUCP>
Date: Thu, 9-Jan-86 16:34:26 EST
Article-I.D.: cfa.165
Posted: Thu Jan  9 16:34:26 1986
Date-Received: Tue, 14-Jan-86 04:48:02 EST
References: <313@decwrl.DEC.COM>
Organization: Harvard-Smithsonian Center for Astrophysics
Lines: 28

> >A recent 3-D map of the distribution of the galaxies in the universe
> >has given evidence that the mass is distibuted roughly on the surface
> >of large bubble shaped regions of space.
> > [...]
>
> I also read this study. The 3D map is currently of one quarter of the
> northern hemisphere of the universe [...]
>

Just a point of detail - the CFA Redshift survey is a magnitude-limited
sample (down to 14.5) of all galaxies in the Zwicky-Nilson catalog with
galactic latitude above +40 and declination above 0 degrees, or below
galactic latitude -30 degrees and above dec of -2.5 degrees. The funny
limits arise since the galactic plane is tilted relative to the solar
system and the earth. The original survey contains 2402 galaxies. I
suspect it is to this survey you refer as being 1/4 of the sky.

The "bubble map" is the result of an extension to fainter objects
(15.5). Since this would result in an increase by a factor of about 4 in
the number of objects (and easily a factor of 5-10 in exposure time per
object, assuming same telescopes, detectors, etc.), the map was
restricted to a swath of 120 by 6 degrees, chosen to intersect the Coma
Cluster of galaxies. The additional depth clearly shows the bubble
effect even in this much smaller pie-shaped slice of the universe.

--
Bill    UUCP:  {harvard,genrad,allegra,ihnp4}!wjh12!cfa!wyatt
Wyatt   ARPA:  wyatt%cfa.UUCP@harvard.ARPA