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- Newsgroups: sci.physics
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!The-Star.honeywell.com!umn.edu!matterhorn!sawdey
- From: sawdey@matterhorn.ee.umn.edu (Aaron Sawdey)
- Subject: Re: hubble and black hole
- Message-ID: <1992Nov22.211548.23960@news2.cis.umn.edu>
- Sender: news@news2.cis.umn.edu (Usenet News Administration)
- Nntp-Posting-Host: matterhorn.ee.umn.edu
- Organization: University of Minnesota, Minneapolis, EE dept.
- References: <1elv7lINNikd@bigboote.WPI.EDU> <FRANL.92Nov21141214@draco.centerline.com>
- Date: Sun, 22 Nov 1992 21:15:48 GMT
- Lines: 25
-
- In <FRANL.92Nov21141214@draco.centerline.com> franl@centerline.com (Fran Litterio) writes:
-
- >llew@bigwpi.WPI.EDU (Lok C. Lew Yan Voon) writes:
-
- >> anyway, nbc news had a short piece 2 days ago that the
- >> space telescope had resolved the nucleus of a galaxy
- >> to a much better resolution than b/f, i think it's
- >> supposed to be a 100 times smaller than previously
- >> believed. from the picture they showed, one can easily
- >> discern the boundary plus a jet-like structure emanating
- >> from one of the poles.
- >>
- >> apparently, it's highly unlikely to be anything but a black hole.
-
- >I want to know why it can't be a really massive neutron star. Don't
- >they have accretion disks and spew jets of hot gas out from their
- >magnetic poles? What data is available other than the image from
- >Hubble?
-
- It's too big. I think that an object with neutron-star density
- and a mass greater than 3 or 4 solar masses (somebody: what's
- the real figure for this?) turns into a black hole. The structures
- imaged by Hubble have scale measured in 1000's of light-years (they're
- 45 Million light years away). I don't think a neutron star big enough
- to create these effects could exist.
-