A String of Radio Emission Associated With Iras 16562–3959: A Collimated Jet Emanating From a Luminous Massive Young Stellar Object

Guzmán, Andrés E.; Garay, Guido; Brooks, Kate

doi:10.1088/0004-637x/725/1/734

Cited by 50 publications

(112 citation statements)

References 33 publications

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“…To determine the physical parameters of the jet found toward G345.4938+01.4677 we assumed a pressure confined jet model (Guzmán et al 2010). This model reproduces well the observed spectral indexes of G345.4938+01.4677 and G337.4032−00.4037 A.…”

Section: Nature Of the Jet Candidatesmentioning

confidence: 85%

“…The evidence for jets from massive YSOs is rather scarce, however. To date there are only a handful of HMYSOs known to be associated with highly collimated jets and/or Herbig-Haro (HH) objects (see Guzmán et al 2010). Most of them have bolometric luminosities smaller than 2×10 4 L ⊙ corresponding to that of a B0 zero-age main sequence (ZAMS) star.…”

Section: Introductionmentioning

confidence: 99%

“…In the analysis we include the results obtained toward one of the jet candidates, G345.4938+01.4677 (also IRAS 16532−3959). A detailed account of its characteristics and physical nature was already presented by Guzmán et al (2010). Summarizing, the radio emission corresponds to a string of radio sources consisting of a compact, bright central component, and four aligned and symmetrically located lobes.…”

Section: Introductionmentioning

confidence: 99%

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Search for Ionized Jets Toward High-Mass Young Stellar Objects

Guzmán

Garay

Brooks

et al. 2012

ApJ

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We are carrying out multi-frequency radio continuum observations, using the Australia Telescope Compact Array, to systematically search for collimated ionized jets towards high-mass young stellar objects (HMYSOs). Here we report observations at 1.4, 2.4, 4.8 and 8.6 GHz, made with angular resolutions of about 7 ′′ , 4 ′′ , 2 ′′ , and 1 ′′ , respectively, towards six objects of a sample of 33 southern HMYSOs thought to be in very early stages of evolution. The objects in the sample were selected from radio and infrared catalogs by having positive radio spectral indices and being luminous (L bol > 2 × 10 4 L ⊙ ), but underluminous in radio emission compared to that expected from its bolometric luminosity. This criteria makes the radio sources good candidates for being ionized jets. As part of this systematic search, two ionized jets have been discovered: one previously published and the other reported here. The rest of the observed candidates correspond to three hypercompact H II regions and two ultracompact H II regions. The two jets discovered are associated with two of the most luminous (7 × 10 4 and 1.0 × 10 5 L ⊙ ) HMYSOs known to harbor this type of objects, showing that the phenomena of collimated ionized winds appears in the formation process of stars at least up to masses of ∼ 20 M ⊙ and provides strong evidence for a disk-mediated accretion scenario for the formation of high-mass stars. From the incidence of jets in our sample, we estimate that the jet phase in high-mass protostars lasts for ∼ 4 × 10 4 yr.

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Section: Nature Of the Jet Candidatesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Search for Ionized Jets Toward High-Mass Young Stellar Objects

Guzmán

Garay

Brooks

et al. 2012

ApJ

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“…Such weak, compact radio continuum emission has been found towards low bolometric luminosity (L bol ≤ 5 × 10 4 L ⊙ ) MYSOs (see e.g. Guzmán et al 2010; Lumsden et al 2013; Avison et al 2015). They are likely associated with shockionisation from an early outflow activity (e.g.…”

Section: Tracers Of Embedded High-mass Starsmentioning

confidence: 97%

The ATLASGAL survey: The sample of young massive cluster progenitors

Csengeri

Bontemps

Wyrowski

et al. 2017

A&A

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Context. The progenitors of high-mass stars and clusters are still challenging to recognise. Only unbiased surveys, sensitive to compact regions of high dust column density, can unambiguously reveal such a small population of particularly massive and cold clumps. Aims. Here we use the ATLASGAL survey to identify a sample of candidate progenitors of massive clusters in the inner Galaxy. Methods. We characterise a flux limited sample of compact sources selected from the ATLASGAL survey. Sensitive mid-infrared data at 21−24 µm from the WISE and MIPSGAL surveys were explored to search for embedded objects, and complementary spectroscopic data were used to investigate their stability and their star formation activity. Results. We identify an unbiased sample of infrared-quiet massive clumps in the Galaxy that potentially represent the earliest stages of massive cluster formation. An important fraction of this sample consists of sources that have not been studied in detail before. We first find that clumps hosting more evolved embedded objects and infrared-quiet clumps exhibit similar physical properties in terms of mass and size, suggesting that the sources are not only capable of forming high-mass stars, but likely also follow a single evolutionary track leading to the formation of massive clusters. The majority of the clumps are likely not in virial-equilibrium, suggesting collapse on the clump scale. Conclusions. We identify the precursors of the most massive clusters in the Galaxy within our completeness limit, and argue that these objects are undergoing large-scale collapse. This is in line with the low number of infrared-quiet massive clumps and earlier findings that star formation, in particular for high-mass objects is a fast, dynamic process. We propose a scenario in which massive clumps start to fragment and collapse before their final mass is accumulated indicating that strong self-gravity and global collapse is needed to build up rich clusters and the most massive stars.

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“…Beuther et al 2002;Cyganowski et al 2009) and jet activity (see e.g. Rodriguez & Bastian 1994;Guzmán et al 2010).…”

Section: On the Mir Emission Of Mysosmentioning

confidence: 99%

Probing the envelopes of massive young stellar objects with diffraction limited mid-infrared imaging

Wheelwright

Wit

Oudmaijer

et al. 2012

A&A

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Context. Massive stars form whilst they are still embedded in dense envelopes. As a result, the roles of rotation, mass loss and accretion in massive star formation are not well understood. Aims. This study evaluates the source of the Q-band, λ c = 19.5 μm, emission of massive young stellar objects (MYSOs). This allows us to determine the relative importance of rotation and outflow activity in shaping the circumstellar environments of MYSOs on 1000 AU scales. Methods. We obtained diffraction limited mid-infrared images of a sample of 20 MYSOs using the VLT/VISIR and Subaru/COMICS instruments. For these 8 m class telescopes and the sample selected, the diffraction limit, ∼0.6 , corresponds to approximately 1000 AU. We compare the images and the spectral energy distributions (SEDs) observed to a 2D, axis-symmetric dust radiative transfer model that reproduces VLTI/MIDI observations of the MYSO W33A. We vary the inclination, mass infall rate, and outflow opening angle to simultaneously recreate the behaviour of the sample of MYSOs in the spatial and spectral domains. Results. The mid-IR emission of 70 percent of the MYSOs is spatially resolved. In the majority of cases, the spatial extent of their emission and their SEDs can be reproduced by the W33A model featuring an in-falling, rotating dusty envelope with outflow cavities. There is independent evidence that most of the sources which are not fit by the model are associated with ultracompact H ii regions and are thus more evolved. Conclusions. We find that, in general, the diverse ∼20 μm morphology of MYSOs can be attributed to warm dust in the walls of outflow cavities seen at different inclinations. This implies that the warm dust in the outflow cavity walls dominates the Q-band emission of MYSOs. In turn, this emphasises that outflows are an ubiquitous feature of massive star formation.

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A String of Radio Emission Associated With Iras 16562–3959: A Collimated Jet Emanating From a Luminous Massive Young Stellar Object

Cited by 50 publications

References 33 publications

Search for Ionized Jets Toward High-Mass Young Stellar Objects

Search for Ionized Jets Toward High-Mass Young Stellar Objects

The ATLASGAL survey: The sample of young massive cluster progenitors

Probing the envelopes of massive young stellar objects with diffraction limited mid-infrared imaging

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