MaNGA vs. eBOSS

27:30>> But, it was observing nearby galaxies. >> Great. >> Um and then there was eBOSS, which was like the last red shift survey we did. >> Another great name. >> Yeah. Yeah, eBOSS Yeah, that was the extended BOSS survey. Anyway, so anyway, retrospectively. But, um but what was happen What we had to make a decision between this, you know, how much time we were spending on each. >> Right. >> And you know, there was a question of uh the competition for each of these two. And basically, Manga actually, for a data set like that, the way the the amount of information we're getting per galaxy uh the number of galaxies, it actually this program ended in 2021,

28:12but there's still nothing that's comparable to it even now. >> Right. >> Whereas with eBOSS, it was our last red shift survey, and another red shift survey called DESI was starting up near the end of when we were uh ending, but not but you know, the it was going to be a small overlap, and our eBOSS team was like you know what? Like, we all want to work on this other project. >> Yeah. >> You know, and we we were really want to close down eBOSS sooner, but we want to reach our goals. >> Yeah. >> And so, the decision there was sort of let's bring forward eBOSS and just spend, you know, I forget exactly, but spend like a whole year

28:54just doing that. Don't do any Manga. And then wait for Manga to do in the last year of the survey. I'm getting the exact timing wrong, but I know so what back. There's a whole report to the Sloan Foundation about it. Um but uh but but that was a decision where it's like we're going to put your data taking on hold so we can these >> people done. >> And then we'll go back to you, which is quite risky because at that time we didn't have enough money to finish the project. >> Oh, wow. >> Yeah, yeah, yeah. So >> Okay. >> Yeah, yeah. So it was um we didn't have enough money to finish the project until maybe 18 months before we finished. >> Wow. >> But part of that So that's a scientific decision. It's like do you

29:36prioritize this thing and put the other thing at risk? And then you you sort of say, "Well, we'll give you a little more time if you'll take it later." >> Yeah. >> And and so you work it out that way. And it also became uh a a selling point to the DOE to give us a little more money, the Department of Energy, to give us a little more money to finish eBOSS. >> Right. >> Uh uh and so so that's an example where it's uh a scientific decision because of the timing of these projects. >> Yeah. >> And but it's somehow intimately tied to the funding decision. Like that only works if you can actually get a little money that helps you close your budget.

30:17And so that's an example where where it's like it's not just an administrative decision or a scientific decision. They're they're intimately connected. >> Right. And just to be clear, these are two programs that are apps king different questions scientifically. >> Totally different. They're trying to use the same telescope. >> They're using exactly the same telescope. >> Right. And and eBOSS is your the red shift? >> Yeah, it's >> So that's the one that's just like charting galaxies far away. >> mapping the universe on the largest scales >> Right. At the time. Yeah, at the time. But I guess DESI was coming on and I think DESI's at in Tucson, right? In Kitt Peak? >> Yeah, it's at Kitt Peak. >> So it's like nearby. >> It's nearby and it was the same same of

30:57people. Like the team of people boss eBOSS were were the people a key part of the team that had proposed DESI. So >> And they'd already gotten time so they're like let's finish up. >> Yeah, they were they they were sort of you know, we're going to we really want to move on to this other thing and and and you know, because for good reasons. And so so that was their motivation. Okay.