98. Stellar systems; interstellar medium; galactic and extragalactic
objects and systems; the Universe
98.10.+z Stellar dynamics and kinematics
98.20.-d Stellar clusters and associations
98.20.Af Associations of stars (OB, T, R) in the Milky Way
98.20.Bg Associations of stars (OB, T, R) in external galaxies
98.20.Di Open clusters in the Milky Way
98.20.Fk Open clusters in external galaxies
98.20.Gm Globular clusters in the Milky Way
98.20.Jp Globular clusters in external galaxies
98.35.-a Characteristics and properties of the Milky Way galaxy
98.35.Ac Origin, formation, evolution, age, and star formation
98.35.Bd Chemical composition and chemical evolution
98.35.Ce Mass and mass distribution
98.35.Df Kinematics, dynamics, and rotation
98.35.Eg Electric and magnetic fields
98.35.Gi Galactic halo
98.35.Hj Spiral arms and galactic disk
98.35.Jk Galactic center (including black hole) and bulge (see also 04.70
Physics of black holes)
98.35.Ln Stellar content and populations; morphology and overall structure
98.35.Mp Infall and accretion
98.35.Nq Galactic winds and fountains
98.38.-j Interstellar medium (ISM) and nebulae in Milky Way
98.38.Am Physical properties (magnetic fields, scintillation scattering,
turbulence, electron density, etc.)
98.38.Bn Atomic, molecular, and chemical processes
98.38.Cp Interstellar dust grain
98.38.Dq Molecular clouds, H sub 2 clouds, dense clouds, and dark clouds
98.38.Er Interstellar masers (for circumstellar masers, see 97.10.F )
98.38.Fs Jets, outflows, and bipolar flows (for pre-main sequence objects, see
97.21)
98.38.Gt H I regions, diffuse clouds, and 21-cm lines
98.38.Hv H II regions; emission and reflection nebulae
98.38.Jw Infrared sources
98.38.Kx Intercloud medium (ICM)
98.38.Ly Planetary nebulae (for nuclei of planetary nebulae, see also 97.20.R)
98.38.Mz Supernova remnants
98.52.-b Normal galaxies; extragalactic objects and systems (by type)
98.52.Cf Classification and classification systems
98.52.Eh Elliptical galaxies
98.52.Lp Lenticular (SO) galaxies
98.52.Nr Spiral galaxies
98.52.Sw Irregular and peculiar galaxies
98.52.Wz Dwarf galaxies (elliptical, irregular, and spheroidal)
98.54.-h Quasars; active or peculiar galaxies, objects, and systems
98.54.Aj Quasars
98.54.Cm Active and peculiar galaxies (including BL Lacertae objects, blazers,
Seyfert galaxies, Markarian galaxies, active galactic nuclei)
98.54.Ep Starburst galaxies and infrared galaxies
98.54.Gr Radio galaxies
98.56.-p Local group; Magellanic clouds
98.56.Ew Elliptical galaxies
98.56.Ne Spiral galaxies (M31 and M33)
98.56.Si Magellanic clouds and other irregular galaxies
98.56.Wm Dwarf galaxies (elliptical, irregular, and spheroidal)
98.58.-w Interstellar medium (ISM) and nebulae in external galaxies
98.58.Ay Physical properties (magnetic fields, scintillation scattering,
turbulence, electron density, etc.)
98.58.Bz Atomic, molecular, and chemical processes
98.58.Ca Interstellar dust grains
98.58.Db Molecular clouds, H sub 2 clouds, dense clouds, and dark clouds
98.58.Ec Interstellar masers (for circumstellar masers, see 97.10.F)
98.58.Fd Jets, outflows, and bipolar flows (for pre-main sequence objects, see
97.21)
98.58.Ge H I regions, diffuse clouds, and 21-cm lines
98.58.Hf H II regions; emission and reflection nebulae
98.58.Jg Infrared sources
98.58.Kh Intercloud medium (ICM)
98.58.Li Planetary nebulae (for nuclei of planetary nebulae, see also 97.20.R)
98.58.Mj Supernova remnants
98.62.-g Characteristics and properties of external galaxies and extragalactic
objects (for the Milky Way, see 98.35)
98.62.Ai Origin, formation, evolution, age, and star formation
98.62.Bj Chemical composition and chemical evolution
98.62.Ck Masses and mass distribution
98.62.Dm Kinematics, dynamics, and rotation
98.62.En Electric and magnetic fields
98.62.Gq Galactic halos
98.62.Hr Spiral arms and bars; galactic disks
98.62.Js Galactic nuclei (including black holes) and bulges (see also 04.70
Physics of black holes)
98.62.Lv Stellar content and populations; radii; morphology and overall
structure
98.62.Mw Infall, accretion, and accretion disks (see also 04.70 Physics of
black holes)
98.62.Nx Jets and bursts; galactic winds and fountains
98.62.Py Distances, redshifts, radial velocities; spatial distribution of
galaxies
98.62.Qz Magnitudes and colors; luminosities
98.62.Ra Intergalactic and intracluster matter
98.62.Sb Gravitational lenses and luminous arcs (see also 95.30.S Relativity
and gravitation)
98.62.Tc Astrometry; identification
98.