Momentum transfer by an internal source of ionizing radiation: an important feedback process during galaxy formation?

Details Momentum transfer by an internal source of ionizing radiation: an important feedback process during galaxy formation? Momentum transfer by an internal source of ionizing radiation: an important feedback process during galaxy formation?

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9631516h&link_type=abstract

Technical Report, Max-Planck-Inst. für Astrophysik Garching, Germany

Astronomy and Astrophysics

Astrophysics

Momentum Transfer, Galactic Evolution, Ionizing Radiation, Radiation Pressure, Intergalactic Media, Mathematical Models, Mass To Light Ratios, Galactic Structure

Scientific paper

The role of momentum transfer ('radiation pressure') due to an internal source of ionizing radiation for the formation of baryonic structures is investigated. Fully-ionized self-gravitating gaseous objects can be radiation-pressure supported on a characteristic length scale Drp proportional to 100 pc - 3 kpc. On smaller scales, momentum transfer due to ionizing radiation will be the dominant force and for spherical collapsing objects of mass less than or approximately equal to 1010 Msun a complete bounce is possible. A population of massive stars and/or accretion onto a central compact object are natural sources of ionizing radiation in newly-forming baryonic structures. Radiation pressure is therefore likely to play an important role for the dynamical and thermal evolution of the intergalactic medium and the mass-to-light ratio of small galaxies. The effect will be especially important for hierarchical cosmogony where galactic structures build up by merging smaller objects. Radiation pressure due to ionizing radiation might furthermore be responsible for substructures of size Drp in the stellar component of large galaxies.

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