UltraCompCAT 2.0

UltraCompCAT: a living catalogue of UCXBs and short-period LMXBs.

UltraCompCAT is a thorough and comprehensive catalogue containing the most up-to-date information on ultra-compact X-ray binaries (UCXBs) and short-orbital-period low-mass X-ray binaries (LMXBs).

Browse sources Acknowledgement

Live catalogue plots

Updated from the current source records

Galactic sky distribution

Galactic distribution of the confirmed UCXBs (yellow), candidates (orange) and short-period LMXBs (green) in Galactic coordinates. Systems located in globular clusters are marked with stars rather than circles; extragalactic systems are marked with a galaxy icon.

20 confirmed 28 candidates 4 short-period LMXBs ★ 11 in GCs (★ 8 GC confirmed ★ 3 GC candidates) 1 extragalactic source AMXP 12 AMXPs

Background image credit: ESA/Gaia/DPAC.

Cumulative UCXB identifications

Cumulative histogram of UCXBs and short orbital period LMXBs detected since the beginning of the X-ray astronomy era. The dark bars represent the confirmed UCXBs.

All sources Confirmed UCXBs

Orbital-period distribution

Top panel: Histogram of the orbital period of UCXBs and short-period LMXB systems, plotted in 10 min bins (grey) and 5 min bins (blue for all (field + GC) systems and green for those located in GCs). The canonical 80 min that defines bona fide UCXBs limit is shown in a dotted black line. Lower panel: Percentage of systems accreting persistently.