Starship Asterisk*

geckzilla wrote:Here's something for you guys to ponder:
"Hubble Space Telescope Discovery of a Probable Caustic-Crossing Event in the MACS1149 Galaxy Cluster Field"
http://www.astronomerstelegram.org/?read=9097

geckzilla wrote:
Here's something for you guys to ponder:

"Hubble Space Telescope Discovery of a Probable Caustic-Crossing Event in the MACS1149 Galaxy Cluster Field"

http://www.astronomerstelegram.org/?read=9097

DavidLeodis wrote:
It took some finding but I've eventually managed to find that
GLASS stands for 'Grism Lens-Amplified Survey from Space'.

http://glass.astro.ucla.edu/ wrote:
The key science drivers of GLASS are:

- To shed light upon the role of galaxies in reionizing the universe, the topology of high redshift intergalactic/interstellar medium and on Lyman alpha escape fraction.

- To study gas accretion, star formation and outflows by mapping spatially resolved star formation and metallicity gradients in galaxies at z = 1.3 - 2.3.

- To study the environmental dependence of galaxy evolution, by mapping spatially resolved star formation in galaxies in the cluster cores and infalling regions.

- To get back his weapons and seek vengeance on those who left him to die.

Gerben wrote:
Great such a supernova. Is it expexted to create a measurable gravitational wave?
And were the gravitational wave detectors Virgo and Ligo online?

• It's at least 30 times too far away

https://en.wikipedia.org/wiki/SN_Refsdal wrote:
The host galaxy of SN Refsdal is at a redshift of 1.49,
corresponding to a comoving distance of 14.4 billion light-years and
a lookback time of 9.34 billion years.

http://stuver.blogspot.com/2015/06/advanced-ligo-is-here.html wrote:

---

<<The illustration above shows the anticipated [core collapse supernova] "reach" of Advanced LIGO (the purple sphere) compared to Initial LIGO (the orange sphere). Each small dot in the figure represents a galaxy. Since the volume of space that the instrument can see grows as the cube of the distance, this means that the event rates will be more than 1,000 times greater. Advanced LIGO will equal the 1-yr integrated observation time of Initial LIGO in roughly 3 hours.>>

(Galaxy map credit: R. Powell, http://www.atlasoftheuniverse.com.)

BobStein-VisiBone wrote:

Craig Willford wrote:...I would have expected the image to arrive first to be the center of the three, then the later ones to be the ones on the fringes, not the other way around.

Good point, Craig. Perhaps this implies the latest image was bent at least twice.

Craig Willford wrote:...I would have expected the image to arrive first to be the center of the three, then the later ones to be the ones on the fringes, not the other way around.

Ann wrote:Tell me, what conclusions can be made about the expansion of the universe from the observation of this predicted suernova?

Hubble Space Telescope wrote:“Hubble has showcased the modern scientific method at its best,” comments Patrick Kelly, lead author of the discovery and re-appearance papers and co-author of the modelling comparison paper from the University of California Berkeley, USA. “Testing predictions through observations provides powerful means of improving our understanding of the cosmos.”

The detection of Refsdal’s reappearance served as a unique opportunity for astronomers to test their models of how mass — especially that of mysterious dark matter — is distributed within this galaxy cluster.