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n1vux (1492)

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Only started with Perl4 and Perl5 in 1995. I was doing AWK etc for 12 years before that, and resisted switching. I've been doing OO since before C++ hit bigtime, with Objective-C and SmallTalk, so I really like the (no longer new) Perl5 OO style; and the Lispish Map style is also an old friend. What do I hack with Perl? All data that passes my way; systems monitoring scripts at $DayJob, weather data at night, and I cheat on NPR word puzzles. Member: [] [] /. LinkedIn []

N1VUX is my FCC-issued ham radio callsign.

Journal of n1vux (1492)

Saturday April 30, 2005
01:15 PM

Science News - Near Perfect Einstein Ring

[ #24468 ]
A perfect celebration of the centenary of Einstein's miracle year, a "near perfect Einstein Ring" has been found. An Einstein Ring is the manifestation of gravitational lensing caused by (near) perfect alignment of a source, an intermediate galaxy (the lens) and the observer (us).

The Discovery of the First "Einstein Ring" Gravitational Lens (VLA History) was in 1979, and only a few are known, with only a few of those being "optical".

(For the record, Einstein's observation that Rings were theoretically possibe was not in the Miracle Year, and he discounted the possibility of ever observing one.)

- Universe Today via /.

Abstract [click thru for PS and PDF of full preprint]

We report the discovery of a partial Einstein ring of radius 1.48arcsec produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy at z=0.986, which is lensing a post-starburst galaxy at z=3.773. This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, (8.3e11 +- 0.4)/h70 Msolar. The fundamental plane relation indicates an evolution rate of d [log (M/L)B] / dz = -0.57+-0.04, similar to other massive ellipticals at this redshift. The source galaxy shows strong interstellar absorption lines indicative of large gas-phase metallicities, with fading stellar populations after a burst. Higher resolution spectra and imaging will allow the detailed study of an unbiased representative of the galaxy population when the universe was just 12% of its current age.

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