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Overview of the Orion Complex

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arxiv 0812.0046 v1 pith:YP44KLHC submitted 2008-11-29 astro-ph

Overview of the Orion Complex

classification astro-ph
keywords orionstarscloudscomplexstarassociationformationforming
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Orion star formation complex is the nearest region of on-going star formation that continues to produce both low and high mass stars. Orion is discussed in the larger context of star formation in the Solar vicinity over the last 100 Myr. The Orion complex is located on the far side of the Gould's Belt system of clouds and young stars throughwhich our Solar systemis drifting. A review is given of the overall structure and properties of the Orion star forming complex, the best studied OB association. Over the last 12 Myr, Orion has given birth to at least ten thousand stars contained in a half dozen sub-groups and short-lived clusters. The Orion OB association has been the source of several massive, high-velocity run-away stars, including mu-Columbae and AE Aurigae. Some of Orion's most massive members died in supernova explosions that created the 300 pc diameter Orion / Eridanus super-bubble whose near wall may be as close as 180 pc. The combined effects of UV radiation, stellar winds, and supernovae have impacted surviving molecular clouds in Orion. The large Orion A, IC 2118 molecular clouds and dozens of smaller clouds strewn throughout the interior of the superbubble have cometary shapes pointing back towards the center of the Orion OB association. Most are forming stars in the compressed layers facing the bubble interior.

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Forward citations

Cited by 8 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A new Gaia census of OB associations within 1 kpc

    astro-ph.GA 2025-12 conditional novelty 7.0

    A new catalogue of 56 OB associations within 1 kpc is produced from Gaia data using HDBSCAN, with most showing expansion and connections to local galactic features.

  2. Emergence of high-mass stars in complex fiber networks (EMERGE) VI. Turbulence dissipation and the formation of dense fibers

    astro-ph.GA 2026-07 accept novelty 6.0

    In Orion, turbulence dissipates in high-shear regions near dense fibers, so the transition to coherence occurs at the fiber level before cores form.

  3. TIME Commissioning Observations: II. On-sky Characterization and the 2D Map Data Processing Pipeline

    astro-ph.IM 2026-07 accept novelty 5.0

    TIME's SPACETIME pipeline yields calibrated spectral maps of OMC and G49.5 with <3% Bolocam flux agreement, demonstrating preliminary on-sky performance for future LIM surveys.

  4. Dynamical evolution and dissolution timescale of young stellar clusters in the Orion star-forming complex

    astro-ph.GA 2026-06 unverdicted novelty 5.0

    Gaia-derived parameters for 13 Orion clusters fed into N-body simulations reveal two regimes: seven with α_vir ≲ 7 retain bound cores for ≳170 Myr while six with α_vir ≳ 7 dissolve before 120 Myr.

  5. Statistical analysis of the relative orientations between filaments and magnetic fields using Herschel and Planck data in star-forming regions

    astro-ph.GA 2026-06 unverdicted novelty 5.0

    Low-column-density filaments align parallel to magnetic fields while high-column-density wide filaments align perpendicular, with transition at roughly 0.8-8 x 10^21 cm^-2; projection effects analyzed statistically.

  6. Early phases of star formation with SKAO: synchrotron emission from dense starless cores in molecular clouds

    astro-ph.GA 2026-06 unverdicted novelty 4.0

    SKAO will enable detection of synchrotron emission from prestellar cores to probe their magnetic field properties in nearby star-forming regions.

  7. TIME Commissioning Observations: II. On-sky Characterization and the 2D Map Data Processing Pipeline

    astro-ph.IM 2026-07 unverdicted novelty 3.0

    TIME commissioning observations demonstrate a 2D map data processing pipeline achieving less than 3% calibration difference versus the Bolocam Galactic Plane Survey on G49.5.

  8. 3D Magnetic Field Vectors in Space: Bubbles, Clouds, and Filaments

    astro-ph.GA 2026-06 unverdicted novelty 2.0

    Reviews SKA techniques for reconstructing 3D magnetic field vectors in the ISM but presents no new data or derivations.