Stellar Absorption-Line Measurements

We provide a binary .fits file that compressed with ‘tar’.

Note that, in case of some problematic objects such as incomplete observed spectra have ‘-9999.000’ indices.

 

 

DOWNLOAD ( -179 Mb)

 

 

  • We measured the strength of various stellar absorption lines after subtracting our best GANDALF model for the nebular emission. (See the index definition for the details)
  • The impact of stellar kinematic broadening is corrected.
  1. LSoptimal : Line Strength measured on the optimal combination of the stellar templates returned by the GANDALF fit.
  2. LSmodel : Line Strength measured on the best stellar model, which is the optimal template convolved by the LOSVD obtained during the pPXF fit and further adjusted for dust reddening by the GANDALF.
  3. If sky-lines(λ5577.0, λ6300.0, λ6363.0 Å, rest-frame) fall into the pseudo-continuum or index passbands of the indices, which can happen for different indices at different redshifts, we provide the LSoptimal value which is measured on the stellar optimal template.

LScorr = LS x LSoptimalLSmodel

  • Prior to the line-strength measurements we subtracted all of the emission fitted by GANDALF, even that from weak lines that would be too weak to be formally deemed detected.

 

 

:: How to read the data?

Here is an example code that extracting H-beta absorption-line strengths for the specific objects, listed on the file called ‘my_objects.dat’. See the followings.

  1. Read the table. (you need ‘mrdfits.pro’)

2. See what field name is assigned for H-beta line strength. Here, ‘Hb’ is used. (IDL is not case-sensitive). All you need is that 1) matching your SDSS_ID with the table and 2) save H-beta strength to new file. See the following.