Back to real data; brief update

This will be short. I’ve provisionally decided to proceed with the Progeny based SSP model libraries I’ve discussed over the last several posts. I’ve picked two versions for model runs: a “small” one with 5 metallicity bins and 42 age bins from log(T) = 6 to 10.1 in 0.1 dex intervals, and a “medium” sized one with just 3 metallicities (log(Z/Z☉) = {-0.25, 0, +0.5}) and 74 age bins with log(T) = 6.0, 6.5 and 6.55, … , 10.1 in 0.05 dex intervals. These all use the MIST isochrones, Kroupa IMF, and the recommended stellar ingredients from the first Progeny paper. As discussed in a previous post the wavelength interval is limited to 3300 – 9000Å because of the prevalence of terrestrial night sky lines and calibration issues in the near IR portion of MaNGA spectra.

I’ve decided to take one more, maybe final, look at a sample of SDSS selected galaxies in MaNGA. I remembered recently that I’ve made several attempts to select post-starburst samples with various queries of SDSS databases. One I did some time ago had nearly 5800 hits in DR8, with 104 cross matches in MaNGA. Part of the query is pasted below:

select into mydb.mylargerka
  s.ra,
  s.dec,
  s.plate,
  s.mjd,
  s.fiberid,
  s.z,
  s.zErr,
  from specObj s
  left outer join galSpecline as g on s.specObjid = g.specObjid
  left outer join galSpecIndx as gi on s.specObjid = gi.specObjid
  left outer join galSpecExtra as ge on s.specObjid = ge.specObjid
where
  (g.oii_3729_eqw > -5 and g.oii_3729_eqw_err > 0) and
  (gi.lick_hd_a_sub > 4 and gi.lick_hd_a_sub_err > 0) and
  s.z >= .02 and
  (s.snMedian > 10) and
  (s.zWarning = 0 or s.zWarning = 16)
  order by
  s.plate, s.mjd, s.fiberid

So basically this is just a standard sort of post-starburst selection with relaxed limits on both Balmer absorption and emission line strength. The line index data were from the MPA/JHU pipeline, which was last run on DR8.

I had run models for about 1/4 of the 104 galaxy sample when a heat wave arrived, and I decided for the sake of our electric bills not to continue intensive computing 24/7. Temperatures are currently below normal, so I may be able to resume soon. About all I can say so far is the sample contains a mix of known PSBs and false positives — which are mostly ordinary star forming galaxies.