Astrometric microlensing probes of the isolated neutron star population with Roman

Catalogues of simulated microlensing events generated in the work "Astrometric microlensing probes of the isolated neutron star population with Roman".

This resource contains:

1. Events detectable in our simulated GBTDS survey:

• gbtds_ns_kick_{v}.csv (where v = (150, 250, 350, 450) - contains simulated events with neutron star (NS) lenses in the simulation where NS are given the mean natal kick v [km/s].
  All columns are as returned in the PopSyCLE output ('_refined_events.fits' file), except the last column 'weight' which contains a correction for spatial distribution of kicked remnants in the present-day Galaxy (described in Section 4.1 of the paper).
• gbtds_bh_kick_100.csv - contains simulated events with black hole lenses, which are the same for each simulation (with a mean natal kick of 350 km/s). All columns as for NS.
• gbtds_star_wd.csv - contains simulated events with stellar and white dwarf lenses, which are the same for each simulation. As no re-weighing is applied, all columns are as in PopSyCLE output.

2. All events:

• all_events.csv - contains all simulated events regardless of their detectability. All columns except the last four are as returned in the PopSyCLE output.
  The additional columns 'mag_det', 'phot_det', and 'ast_det' are flags for source passing the maximum magnitude detectability cut, photometric microlensing signal detectability, and astrometric microlensing signal detectability, respectively. These flags are set to 0 if the event does not pass the cut and 1 if it passes the cut. Additionally, as astrometric detectability was expensive to compute, it was only checked for events already passing the other two cuts; 'ast_det' is set to -1 if it was not checked.
  The additional column 'ns_kick' is set to the mean kick velocity for NS lenses to indicate belonging to either of the 4 simulations, and is set to -1 for all lenses that are not NS.
  This dataset is recommended if users choose to apply their own detectability cuts.