OPC Categories
A - COSMOLOGY AND THE INTERGALACTIC MEDIUM
| A1 | Galaxies in their environment (e.g. galaxies in groups and clusters, merging galaxies, galaxy interactions, ram-pressure stripping of galaxies in groups and clusters) |
| A2 | Global properties of galaxy groups, clusters and proto-structures including the intracluster medium |
| A3 | Dark matter and gravitational lensing |
| A4 | Intergalactic medium, circumgalactic medium and intervening absorption systems (e.g. Lyman alpha clouds, damped Lyman alpha systems and associated galaxies) |
| A5 | Discovery surveys and the statistical study of galaxy properties (e.g. spectroscopic and redshift surveys, identifications, large scale structure, galaxy luminosity function and mass function, surveys for active galactic nuclei) |
| A6 | Reionization and cosmic dawn (probes of reionization, galaxies in the epoch of reionization) |
| A7 | Cosmological parameters (e.g. distance scale, dark energy, fundamental physics). |
B - GALAXIES
| B1 | The Milky way and local group galaxies |
| B2 | Resolved and unresolved stellar populations in galaxies beyond the Local Group (e.g. stellar metallicity, star formation histories) |
| B3 | Galaxy structure, dynamics and kinematics (e.g. bulges, disks, morphology, in/outflows, dark matter inside galaxies, stellar orbits) |
| B4 | Dwarf galaxies, stellar clusters in galaxies and satellite galaxies |
| B5 | Galactic centre, galaxy nuclei and supermassive black holes |
| B6 | Physics of Active Galactic Nuclei |
| B7 | Interstellar medium and star formation in galaxies (e.g., in/outflows, starburst galaxies, gas-phase metallicity, dust in galaxies) |
C - INTERSTELLAR MEDIUM, STAR FORMATION and PLANETARY SYSTEMS
| C1 | Gas and dust, giant molecular clouds, cool and hot gas, diffuse and translucent clouds |
| C2 | Chemical processes in the interstellar medium |
| C3 | Star forming regions, globules, protostars, HII regions |
| C4 | Pre-main-sequence stars (massive PMS stars, Herbig Ae/Be stars and T Tauri stars) |
| C5 | Outflows, stellar jets, HH objects |
| C6 | Main-sequence stars with circumstellar matter, early evolution |
| C7 | Young binaries, brown dwarfs, exosolar planet searches |
| C8 | Solar system (planets, comets, small bodies) |
D - STELLAR EVOLUTION
| D1 | Main-sequence stars |
| D2 | Post-main-sequence stars, giants, supergiants, AGB stars, post-AGB stars |
| D3 | Pulsating stars and stellar activity |
| D4 | Mass loss and winds |
| D5 | Supernovae, pulsars |
| D6 | Planetary nebulae, nova remnants and supernova remnants |
| D7 | Pre-white dwarfs and white dwarfs, neutron stars |
| D8 | Evolved binaries, black-hole candidates, novae, X-ray binaries, CVs |
| D9 | Gamma-ray and X-ray bursters |
| D10 | OB associations, open and globular clusters, extragalactic star clusters |
| D11 | Individual stars in external galaxies, resolved stellar populations |
| D12 | Distance Scale - stars |
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