The Orion Nebula in the mid-IR

Abstract

We present two wide-field (5'x5'), diffraction limited, broad-band 10 and 20 micron images of the Orion Nebula, plus six 7-13 micron narrow-band images of BN/KL taken at the 3.8m UKIRT telescope. The wide-field images are mosaics of 35"x35" frames reconstructed using a new restoration method developed for this project. They show the filamentary structure of the dust emission and reveal a new remarkable group of arc-like structures ~1' to the South of the Trapezium. The morphology of the Ney-Allen nebula suggests a complex kinematical status at the center of the Cluster. We find indications that the B0.5V star theta1 Ori-D, is surrounded by a photoevaporated circumstellar disk. Among the four historic Trapezium OB stars, this is the only one without a binary companion, suggesting that stellar multiplicity and the presence of massive circumstellar disks may be mutually exclusive. In the BN/KL complex we detect optically thin silicate emission on top of the deep 10 micron absorption feature. We map the foreground optical depth, color temperature and mid-IR luminosity of the embedded sources. We resolve a conspicuous point source at the location of the IRc2-A knot. The spectral profile of the 10 micron feature is compatible with grain crystallization. We detect several point sources In the OMC-1 South region and discuss their association with the mass loss observed at optical and mm wavelengths. Finally, we list the position and photometry of 177 point sources. With two possible exceptions, all point sources detected at shorter wavelengths display 10 micron emission well above the photospheric level. The model of Robberto et al. (2002, ApJ, 578, 897) provides the simplest explanation for the mid-IR excess.

34 pages, 22 figures, 5 tables, AJ in press

References in corpus (16)

• Embedded Clusters in Molecular Clouds
• The Luminosity & Mass Function of the Trapezium Cluster: From B stars to the Deuterium Burning Limit
• Constraints on the Stellar/Sub-stellar Mass Function in the Inner Orion Nebula Cluster
• The Initial Mass Function of Low-Mass Stars and Brown Dwarfs in Young Clusters
• A Population of very young Brown Dwarfs and free-floating Planets in Orion
• Infrared L Band Observations of the Trapezium Cluster: A Census of Circumstellar Disks and Candidate Protostars
• A Keck High Resolution Spectroscopic Study of the Orion Nebula Proplyds
• A new mid-infrared map of the BN/KL region using the Keck telescope
• High Angular Resolution Mid-infrared Imaging of Young Stars in Orion BN/KL
• HST/WFPC2 Study of the Trapezium Cluster: the Influence of Circumstellar Disks on the Initial Mass Function
• A Cluster of 1.3 cm Continuum Sources in OMC1 South
• The Infrared Emission of Circumstellar Envelopes, Dark Silhouettes and Photoionized Disks in HII Regions
• Thermal-IR Detection of Optical Outflow Sources in OMC1 South
• Kinematics of Herbig-Haro Objects and Jets in the Orion Nebula
• Wide-field imaging at mid infrared wavelengths: reconstruction of chopped and nodded data
• Mid-Infrared Imaging of Alpha Orionis

Cited by in corpus (37)

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• A Multi-Color Optical Survey of the Orion Nebula Cluster. Part I: the Catalog
• The VLTI/MIDI survey of massive young stellar objects - Sounding the inner regions around intermediate- and high-mass young stars using mid-infrared interferometry
• Antifreeze in the hot core of Orion - First detection of ethylene glycol in Orion-KL
• The Orion HII Region and the Orion Bar in the Mid-Infrared
• Herschel observations of Extra-Ordinary Sources: H2S as a Probe of Dense Gas and Possibly Hidden Luminosity Toward the Orion KL Hot Core
• Silicon Monoxide Observations Reveal a Cluster of Hidden Compact Outflows in the OMC1 South Region
• Near-Infrared Variability in the Orion Nebula Cluster
• A Highly Collimated, Young and Fast CO(2-1) Outflow in OMC1 South
• High Velocity Features in the Orion Nebula
• A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region
• An Improved HR Diagram for the Orion Trapezium Cluster
• Large Scale Flows from Orion-South
• New Evidence for the Dynamical Decay of a Multiple System in the Orion Kleinmann-Low Nebula
• Multi-wavelength study of the disk around the very low-mass star Par-Lup3-4
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy I: HH529II and III
• Hubble Space Telescope NICMOS Polarization Measurements of OMC-1
• Ionized gas diagnostics from protoplanetary discs in the Orion Nebula and the abundance discrepancy problem
• First Science Observations with SOFIA/FORCAST: 6 TO 37 micron Imaging of Orion BN/KL
• The Nature and Frequency of Outflows from Stars in the Central Orion Nebula Cluster
• Multi-Conjugate Adaptive Optics images of the Trapezium Cluster
• Physical Relation of Source I to IRc2 in the Orion KL Region
• X-ray embedded stars as driving sources of outflow-driven turbulence in OMC1-S
• ALMA observations of the archetypal "hot core" that isn't: Orion KL
• An In-Depth View of the Mid-Infrared Properties of Point Sources and the Diffuse ISM in the SMC Giant HII Region, N66
• The complexity of Orion: an ALMA view III. The explosion impact
• Bow shocks, bow waves, and dust waves. III. Diagnostics
• True versus apparent shapes of bow shocks
• Circular Polarimetry and the Line of Sight to the BN Object
• Diffuse continuum transfer in H II regions
• The NEMESIS Catalogue of Young Stellar Objects for the Orion Star Formation Complex. I. General description of data curation
• First Science Observations with SOFIA/FORCAST: 6 to 37 micron Imaging of the Central Orion Nebula
• Robust Reconstruction from Chopped and Nodded Images
• The curious morphology and orientation of Orion proplyd HST-10