VLT Smashes Record of Farthest Known Galaxy

← Back to Stories (view on slashdot.org)

VLT Smashes Record of Farthest Known Galaxy

Posted by Hemos on Monday March 1, 2004 @01:04AM from the smashing-the-records dept.

rduke15 writes "From this press release of the European Southern Observatory : 'Named Abell 1835 IR1916, the newly discovered galaxy [...] is located about 13,230 million light-years away. It is therefore seen at a time when the Universe was merely 470 million years young[...].' More details and pictures here."

20 of 39 comments (clear)

Min score:

Reason:

Sort:

Re:thousand million? by Sidoine · 2004-03-01 01:34 · Score: 5, Informative

In fact in Europe 1 billion = 1 million millions while 1000 millions is 1 milliard.
Re:The Beginning by Sidoine · 2004-03-01 01:36 · Score: 3, Informative

No, initially the Universe was not transparent.
Re:thousand million? by Anonymous Coward · 2004-03-01 02:19 · Score: 3, Informative

Sadly, no he's not... cf. reference.com...
Links to an easier to read summary by rduke15 · 2004-03-01 03:12 · Score: 4, Informative

Here is an easier to read summary. More keep appearing on Google news. Try this search. It already brings up a link to a space.com article, and to one in the Los Angeles Times for those of you who have a subscription (I don't).
End of galaxy by Anonymous Coward · 2004-03-01 03:19 · Score: 2, Interesting

Has anyone decided what's past the expanding universe?

I mean what's it expanding into?
1. Re:End of galaxy by WasteOfAmmo · 2004-03-01 06:09 · Score: 4, Interesting
  
  In fact there is nothing (literally) beyond the expanding universe. It is space itself that is expanding, therefore beyond the universe space, time, etc. does not exist and therefore there is truely nothing.
  It is a hard idea to grasp along with such questions as what is the shape of the universe.
  One of the other replies had it correct.. it is not that the galaxies are moving away from each other, it is that space itself is expanding and therefore the distance between all galaxies is increasing. It was the observation that all other galaxies are retreating from us the lead to the theory that we were at the centre of the universe. Of couse it did not take long to prove this wrong.
  Merlin.
Only one line detection? by Doctor+Fishboy · 2004-03-01 03:50 · Score: 4, Interesting

They're basing it on a single emission line detection - that the identified emission line is highly redshifted Lyman alpha. Normally, you'd like at least one or two other emission lines to pin down the redshift uniquely. I can see that they're also arguing that its blackbody color leads to a photometic redshift from z of 9 to 11, but those error bars look mighty big to me, and they're relying on the non-detections short of 1 micron. Any quasar savvy astronomers care to comment? I know you're out there in /. land...

Even if it doesn't turn out to be a z~10 quasar, this is an excellent piece of detective work. Big kudos to the authors on this.

Dr Fish

The detailed detection images from one of the authors.
1. Re:Only one line detection? by elliptical_boy · 2004-03-01 07:35 · Score: 5, Interesting
  
  I agree that only one line is suspicious. But the spectral energy distribution --- its optical and infrared colors --- argue pretty convincingly for its idenitification as a high-redshift galaxy (at least for me, as someone who's worked in this subject).
  
  Moreover, the authors argue in the paper that the object sits on the appropriate gravitational-lensing caustic for a redshift 9-10 object. I.e., if the galaxy in question---Abell 1835 IR1916 --- sits on at the right place relative to the foreground galaxy cluster (Abell 1835), the General Theory of Relativity says that the mass of the cluster should magnify the galaxy by 25 to 100x in brightness (one of the authors, J.-P. Kneib, is a world expert on gravitational lensing).
  
  Lastly, if the galaxy was at, say, z=2.7, and thus much closer---but consistent with the colors if the galaxy was full of dust---the line would have to be the forbidden doublet of singly-ionized oxygen at 372.62 and 372.89 nm. But this doublet would have been easily resolved by the high resolution of ISAAC, the infrared spectrograph on the VLT used by the authors, but not seen.
  
  BTW, probably not a quasar --- the IR (restframe UV) colors are too blue compared to the Sloan z=6 clusters.
  
  The thing that bothers me, though, is the the shape of the Ly-alpha line --- it's asymmetric in the wrong way (too sharp on the red side, too gaussian on the blue side) compared to the z=3 galaxies.
  
  Still need a lot more data, though --- both deeper NIR spectra to look for the continuum and mid-IR images (perhaps from the VLT, or Spitzer Space Telescope, or eventually the James Webb Space Telescope) to confirm the restframe optical colors.
  
  Cheers,
  Scott
Re:thousand million? by boarder · 2004-03-01 04:09 · Score: 4, Interesting

Well, I'm not sure how true that is today...

Milliard USED to be the Euro term for the U.S. billion, but most nations have switched to the U.S. term for 1,000,000,000. Milliard and the old Euro def of billion are archaic usages, and billion is generally used in the U.S. sense. Check Wikipedia for Milliard and also Wiki for Billion. A google-fight between billion and milliard results in 12,800,000 hits for billion and 235,000 for milliard. Billion wins.

Of course, I'm American, so I don't know how often the general public in Europe uses those terms and with what meanings; but officially in the government the terms have changed.

--
IANAL, but I play one on /.
Re:thousand million? by another_henry · 2004-03-01 04:55 · Score: 2, Interesting

I'm British, and apart from a very few people we all use the american term, i.e. billion=10^9

--
"Studies have shown that people who eat peanuts live longer than those who do not eat."
The universe is infinite by Sidoine · 2004-03-01 05:04 · Score: 3, Interesting

Or at least it loops if the universe is not "flat", which does not change anything. Anyway, this expansion does not mean that there is a true movement, like in an explosion. The distance between things change, that's all.
1. Re:The universe is infinite by Ckwop · 2004-03-01 08:23 · Score: 2, Informative
  
  WMAP showed that the universe is flat beyond reasonable doubt.
  
  I don't understand your point about "true movement". If the distance between two objects changes as a function of time they are said to be moving.
  
  Simon
It give new meaning to... by SirTreveyan · 2004-03-01 05:13 · Score: 5, Funny

a long time ago in a galaxy far far away...

I know...but someone had to do it...

--
SELECT * FROM User WHERE Clue > 0

0 rows returned
Re:The Beginning by barakn · 2004-03-01 05:23 · Score: 4, Informative

We can only 'see' back to when the cosmic background radiation first escaped from the hot plasma of the Big Bang (when it had cooled to about 3000 K). There is some speculation that we might be able to see through this using gravitational waves.

--
"I'm so moist I'm sticking to the leather." -Kermit the Frog on The Late Late Show
It's expanding "Into" itself by rpresser · 2004-03-01 06:00 · Score: 5, Informative

You can think of it (in mathematical terms) as a mapping of R^3 onto itself which expands distances.

An analogy that may help:

Take a circular rubber sheet. Draw some dots on it. Pull the sides of the rubber sheet and watch the dots separate.

Now imagine your rubber sheet started out as an infinite plane: it is no more infinite after stretching than before, yet all distances have increased.

Now generalize from an infinite plane to an infinite volume, and you should get the idea.
1. Re:It's expanding "Into" itself by Abcd1234 · 2004-03-01 10:39 · Score: 2, Insightful
  
  And how does this little diversion into set theory change the grandparent's point that the universe has no boundary, and hence cannot be expanding "into" anything?
Ahem.. by Transcendent · 2004-03-01 06:05 · Score: 3, Interesting

...is located about 13,230 million light-years away. It is therefore seen at a time when the Universe was merely 470 million years young

Assuming that the universe is 13.5 billion years old and that we've been moving away from that galaxy near the speed of light (around 0.965c if my math is correct).

I would think that finding such a thing would tend to make people think the universe is older.
Re:thousand million? by Tango42 · 2004-03-01 06:27 · Score: 2, Informative

No, it was never the "Euro" term. The French have always used Billion to mean 10^9, and the americans copied. Britain has recently switched to using the same system.
Ob Simpsons Quote by TimeZone · 2004-03-01 08:06 · Score: 2, Funny

It is a hard idea to grasp along with such questions as what is the shape of the universe.
Your theory of a donut shaped universe is intriguing. I may have to steal it.
TZ
Re:The Beginning by Doctor+Fishboy · 2004-03-01 16:02 · Score: 4, Informative

You're completely right about the point in time beyond which we wouldn't see any more, and you're right about the expansion of the universe being faster than the speed of light. So it means that the whole universe may be many trillions of light years (or even infinite) in size, but the oldest light we can possibly see is that from less than 13 billion light years away (rough age of the universe).

General Relativity *does* allow separate parcels of space to move apart from each other faster than the speed of light, in that GR is only valid for local inertial reference frames. Space *itself* is doing the expanding, and not the interaction of mass and energy sitting through it, which is what is described by GR. Sorry, I'm not a GR physicist, so I can't give a good explanation for what seem like a cheat in GR, but it is apparently valid.

Your last line is partly true, in that the universe is thought to have had an era of insanely rapid expansion - one doubling of its effective size every 10**-34 seconds or so - for many tens of thousands of doublings, back when the universe was about 10**-30 seconds old. It's called Inflation theory, and it was created to explain why the effective temperature of seemingly separate parts of the universe is very very similiar. The argument is that the universe we can see (and anything beyond 13 billion light years away) was, at one time, in thermal equilibrium with itself, and then this inflation era blew up the universe faster than the local speed of light in any causal region.

Erm. Just had a few beers, so this may not help, but go check out "The inflationary Universe" by Alan Guth, who explains it a lot clearer than me at the moment :)

Cheers,

Dr Fish