Postrefurbishment mission Hubble Space Telescope images of the core of the Orion Nebula: Proplyds, Herbig-Haro objects, and measurements of a circumstellar disk

O’Dell, C. R.; Zhao, Wen

doi:10.1086/174892

Cited by 310 publications

(223 citation statements)

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“…O'Dell for PROtoPLanetarY DiskS, are generally seen in radio free-free images (Churchwell et al, 1987;Garay et al, 1987;Felli et al, 1993) or optical and near-infrared images (Laques and Vidal, 1979;O'Dell et al, 1993;McCaughrean and Stauffer, 1994;O'Dell and Wen, 1994;Stauffer et al, 1994;McCullough et al, 1995;O'Dell and Wong, 1996;Bally et al, 1998) of their bright ionization fronts, their central low-mass star (Mϳ0.3M ᭪ ; Hillenbrand, 1997), or their silhouetted disks. The ionization fronts are often about 100 AU from the central star and are cometary in shape, with their tails pointing away from the ultraviolet-luminous, massive star 1 Ori C. The disks, when seen in silhouette, are also of order 100 AU in size, although there is sometimes a significant separation between disk and ionization front.…”

Section: Pdr Models Of Photoevaporating Protoplanetary Disksmentioning

confidence: 99%

Photodissociation regions in the interstellar medium of galaxies

Hollenbach

Tielens²

1999

Rev. Mod. Phys.

728

708

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The interstellar medium of galaxies is the reservoir out of which stars are born and into which stars inject newly created elements as they age. The physical properties of the interstellar medium are governed in part by the radiation emitted by these stars. Far-ultraviolet (6 eVϽh Ͻ13.6 eV) photons from massive stars dominate the heating and influence the chemistry of the neutral atomic gas and much of the molecular gas in galaxies. Predominantly neutral regions of the interstellar medium in which the heating and chemistry are regulated by far ultraviolet photons are termed PhotoDissociation Regions (PDRs). These regions are the origin of most of the non-stellar infrared (IR) and the millimeter and submillimeter CO emission from galaxies. The importance of PDRs has become increasingly apparent with advances in IR and submillimeter astronomy. The IR emission from PDRs includes fine structure lines of C, C ϩ , and O; rovibrational lines of H 2 ; rotational lines of CO; broad mid-IR features of polycyclic aromatic hydrocarbons; and a luminous underlying IR continuum from interstellar dust. The transition of H to H 2 and C ϩ to CO occurs within PDRs. Comparison of observations with theoretical models of PDRs enables one to determine the density and temperature structure, the elemental abundances, the level of ionization, and the radiation field. PDR models have been applied to interstellar clouds near massive stars, planetary nebulae, red giant outflows, photoevaporating planetary disks around newly formed stars, diffuse clouds, the neutral intercloud medium, and molecular clouds in the interstellar radiation field-in summary, much of the interstellar medium in galaxies. Theoretical PDR models explain the observed correlations of the [CII] 158 m with the CO Jϭ1 -0 emission, the CO Jϭ1 -0 luminosity with the interstellar molecular mass, and the [CII] 158 m plus [OI] 63 m luminosity with the IR continuum luminosity. On a more global scale, PDR models predict the existence of two stable neutral phases of the interstellar medium, elucidate the formation and destruction of star-forming molecular clouds, and suggest radiation-induced feedback mechanisms that may regulate star formation rates and the column density of gas through giant molecular clouds. [S0034-6861(99)01001-6] CONTENTS

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Section: Pdr Models Of Photoevaporating Protoplanetary Disksmentioning

confidence: 99%

Photodissociation regions in the interstellar medium of galaxies

Hollenbach

Tielens²

1999

Rev. Mod. Phys.

728

708

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“…This comparison was made in overlapping regions between the data presented here and those in S98. For example the object reported as a photo-evaporating circumstellar disk 154-240 (O'Dell et al 1997;O'Dell & Wen 1994) at 05 h 35 m 15.4 s , −0.5 0 22 40 (J2000) shown in Figs. 1 and 5b in S98 may also be found in our image, at an offset 6.1 E, 0.6 S.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

“…Photo-evaporating circumstellar disks, which are young stars with circumstellar material, have also been very intensively studied since their original identification (O'Dell et al 1993;O'Dell & Wen 1994;McCaughrean & O'Dell 1996;McCaughrean et al 1998;Henney & O'Dell 1999;Simon et al 1999). The incentive is that the study of these objects provides a route to the understanding of planetary formation in the stellar nebula around a young stellar object.…”

Section: Introductionmentioning

confidence: 99%

H₂infrared emission and the formation of dense structures in the Orion molecular cloud

Vannier

Lemaire

Field

et al. 2001

A&A

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Abstract.Observations are reported of IR emission of H2 from a region of the Orion molecular cloud (OMC1) between the Becklin-Neugebauer object and IRc2 to the north and the Trapezium stars to the south. Data were obtained using the ESO 3.6 m telescope in the K-band around 2 µm with the ADONIS adaptive optics system. Images of H2 v = 1−0 S(1) show a spatial resolution of ∼0.15 . Detailed investigations of the distribution of sizes of structures in our images have been performed by area-perimeter analysis, Fourier analysis and brightness distribution studies. These demonstrate that structure is not fractal but shows a preferred scales of between 3 10 −3 and 4 10 −3 pc. In an attempt to estimate the density in observed structures, predictions of both shock models and photodissociation region models have been compared with measured emission brightness in the H2 v = 1−0 S(1) line. Magnetic (C-type) shocks with velocities of 30 km s −1 and pre-shock densities of 10 6 cm −3 yield the best representation of our data, notwithstanding significant discrepancies for the brightness ratio between v = 2−1 S(1) and v = 1−0 S(1) lines. Our results show that post-shock densities are several times 10 7 cm −3 . This is sufficiently high that the passage of C-type shocks in Orion yields gravitational instability which may in turn trigger star formation in the post-shock gas.

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“…Near-infrared surveys of the ONC find >700 young stellar objects (YSOs), most of which are likely to harbor protoplanetary disks (Hillenbrand & Carpenter 2000). Hubble Space Telescope (HST) images of the ONC also reveal ionized disks and dusty disks silhouetted against the backdrop of nebular emission (e.g., O'Dell & Wen 1994;Bally et al 1998a;Smith et al 2005;Ricci et al 2008).…”

Section: Introductionmentioning

confidence: 99%

A Vla Survey for Faint Compact Radio Sources in the Orion Nebula Cluster

Sheehan

Eisner

Mann

et al. 2016

ApJ

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We present Karl G. Jansky Very Large Array 1.3, 3.6, and 6 cm continuum maps of compact radio sources in the Orion Nebular Cluster (ONC). We mosaicked 34 arcmin 2 at 1.3 cm, 70 arcmin 2 at 3.6 cm and 109 arcmin 2 at 6 cm, containing 778 near-infrared detected young stellar objects and 190 Hubble Space Telescope-identified proplyds (with significant overlap between those characterizations). We detected radio emission from 175 compact radio sources in the ONC, including 26 sources that were detected for the first time at these wavelengths. For each detected source, we fitted a simple free-free and dust emission model to characterize the radio emission. We extrapolate the free-free emission spectrum model for each source to ALMA bands to illustrate how these measurements could be used to correctly measure protoplanetary disk dust masses from submillimeter flux measurements. Finally, we compare the fluxes measured in this survey with previously measured fluxes for our targets, as well as four separate epochs of 1.3 cm data, to search for and quantify the variability of our sources.

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Postrefurbishment mission Hubble Space Telescope images of the core of the Orion Nebula: Proplyds, Herbig-Haro objects, and measurements of a circumstellar disk

Cited by 310 publications

References 0 publications

Photodissociation regions in the interstellar medium of galaxies

Photodissociation regions in the interstellar medium of galaxies

H₂infrared emission and the formation of dense structures in the Orion molecular cloud

A Vla Survey for Faint Compact Radio Sources in the Orion Nebula Cluster

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Postrefurbishment mission Hubble Space Telescope images of the core of the Orion Nebula: Proplyds, Herbig-Haro objects, and measurements of a circumstellar disk

Cited by 310 publications

References 0 publications

Photodissociation regions in the interstellar medium of galaxies

Photodissociation regions in the interstellar medium of galaxies

H2infrared emission and the formation of dense structures in the Orion molecular cloud

A Vla Survey for Faint Compact Radio Sources in the Orion Nebula Cluster

Contact Info

Product

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H₂infrared emission and the formation of dense structures in the Orion molecular cloud