Imaging and integral-field spectroscopy of shocked H2 around G25.65+1.05

Todd, Stephen; Ramsay, Suzanne

doi:10.1111/j.1365-2966.2006.09947.x

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…Shepherd & Churchwell (1996a) observed G26.65+1.05 in their survey of high-velocity CO; they detected an energetic bipolar outflow centred on the radio source. Todd & Ramsay Howat (2006) have recently presented high angular resolution images of this source in the K band and the v=1-0 S(1) line of H 2 . The source has an extremely complex morphology and jet-like features abound.…”

Section: Appendix A: Results and Discussion On Individual Sourcesmentioning

confidence: 99%

“…These observations show that the outflows are mainly jet‐driven as in low‐mass stars and not wind‐driven. (Some examples of spectroscopic verifications of shocked emission from HMYSO jets are IRAS 20126 –Caratti O Garatti et al 2008, IRAS 18151 –Davis et al 2004, IRAS 11101‐5928 –Gredel 2006 and IRAS 18316 –Todd & Ramsay Howat 2006. )…”

Section: Discussionmentioning

confidence: 99%

“…There are several massive YSOs for which collimated bipolar outflows have been observed in CO and in the near‐IR (e.g. Cesaroni et al 1997; Davis et al 1998, 2004; Shepherd et al 2000; Kumar, Bachiller & Davis 2002; Beuther et al 2002a,c; Beuther, Schilke & Stanke 2003; Zhang et al 2005; Todd & Ramsay Howat 2006). Studying the luminous YSO IRAS 19410+2336, Beuther et al (2003) found that the field hosts multiple bipolar outflows, which are as collimated as the outflows from low‐mass YSOs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A near-IR imaging survey of intermediate- and high-mass young stellar outflow candidates

Varricatt¹,

Davis²,

Ramsay³

et al. 2010

Monthly Notices of the Royal Astronomical Society

106

168

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We have carried out a near‐infrared imaging survey of luminous young stellar outflow candidates using the United Kingdom Infrared Telescope. Observations were obtained through the broad‐band K (2.2 μm) and narrow‐band filters at the wavelengths of H2 v= 1–0 S(1) (2.1218 μm) and Brγ (2.166 μm) lines. 50 regions were imaged with a field of view of 2.2 × 2.2 arcmin2. Several young embedded clusters are unveiled in our near‐infrared images. 76 per cent of the objects exhibit H2 emission and 50 per cent or more of the objects exhibit aligned H2 emission features suggesting collimated outflows, many of which are new detections. These observations suggest that disc accretion is probably the leading mechanism in the formation of stars, at least up to late O spectral types. The young stellar objects (YSOs) responsible for many of these outflows are positively identified in our images based on their locations with respect to the outflow lobes, Two‐Micron All‐Sky Survey colours and association with Midcourse Space Experiment, Infrared Astronomical Satellite, millimetre and radio sources. The close association of molecular outflows detected in CO with the H2 emission features produced by shock excitation by jets from the YSOs suggests that the outflows from these objects are jet‐driven. Towards strong radio emitting sources, H2 jets were either not detected or were weak when detected, implying that most of the accretion happens in the pre‐ultracompact (pre‐UC) H ii phase; accretion and outflows are probably weak when the YSO has advanced to its UC H ii stage.

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Section: Appendix A: Results and Discussion On Individual Sourcesmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A near-IR imaging survey of intermediate- and high-mass young stellar outflow candidates

Varricatt¹,

Davis²,

Ramsay³

et al. 2010

Monthly Notices of the Royal Astronomical Society

106

168

View full text Add to dashboard Cite

show abstract

“…Correcting the line fluxes for extinction should reduce the scatter of the points about a linear fit. Therefore, varying A v and analysing the goodness of the fit leads to an estimate of A v (Todd & Ramsay Howat, 2006). A H 2 excitation diagram for the ISO-Oph 200 jet was constructed (see Figure A.1) using the fluxes given in Table 1.…”

Section: Outflow Morphology Kinematics and Physical Propertiesmentioning

confidence: 99%

The near-infrared outflow and cavity of the proto-brown dwarf candidate ISO-Oph 200

Whelan

Riaz

Rouze

2018

A&A

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In this letter a near-infrared integral field study of a proto-brown dwarf candidate is presented. A ∼ 0. 5 blue-shifted outflow is detected in both H 2 and [Fe II] lines at V sys = (-35 ± 2) km s −1 and V sys = (-51 ± 5) km s −1 respectively. In addition, slower (∼ ± 10 km s −1 ) H 2 emission is detected out to < 5. 4, in the direction of both the blue and red-shifted outflow lobes but along a different position angle to the more compact faster emission. It is argued that the more compact emission is a jet and the extended H 2 emission is tracing a cavity. The source extinction is estimated at A v = 18 mag ± 1 mag and the outflow extinction at Av = 9 mag ± 0.4 mag. The H 2 outflow temperature is calculated to be 1422 K ± 255 K and the electron density of the [Fe II] outflow is measured at ∼ 10000 cm −3 . Furthermore, the mass outflow rate is estimated atṀ out[H2] = 3.8 × 10 −10 M yr −1 andṀ out[FeII] = 1 × 10 −8 M yr −1 .Ṁ out[FeII] takes a Fe depletion of ∼ 88% into account. The depletion is investigated using the ratio of the [FeII] 1.257 µm and [PII] 1.188 µm lines. Using the Paβ and Brγ lines and a range in stellar mass and radiusṀ acc is calculated to be (3 -10) × 10 −8 M yr −1 . Comparing these rates puts the jet efficiency in line with predictions of magneto-centrifugal models of jet launching in low mass protostars. This is a further case of a brown dwarf outflow exhibiting analogous properties to protostellar jets.

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A general catalogue of molecular hydrogen emission-line objects (MHOs) in outflows from young stars

Davis

Gell

Khanzadyan

et al. 2010

A&A

110

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We present a catalogue of Molecular Hydrogen emission-line Objects (MHOs) in outflows from young stars, most of which are deeply embedded. All objects are identified in the near-infrared lines of molecular hydrogen, all reside in the Milky Way, and all are associated with jets or molecular outflows. Objects in both low and high-mass star forming regions are included. This catalogue complements the existing database of Herbig-Haro objects; indeed, for completeness, HH objects that are detected in H 2 emission are included in the MHO catalogue.

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Imaging and integral-field spectroscopy of shocked H2 around G25.65+1.05

Cited by 7 publications

References 28 publications

A near-IR imaging survey of intermediate- and high-mass young stellar outflow candidates

A near-IR imaging survey of intermediate- and high-mass young stellar outflow candidates

The near-infrared outflow and cavity of the proto-brown dwarf candidate ISO-Oph 200

A general catalogue of molecular hydrogen emission-line objects (MHOs) in outflows from young stars

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