The RMS survey

Urquhart, J. S.; Hoare, M. G.; Lumsden, S. L.; Oudmaijer, R. D.; Moore, T. J. T.; Brook, Paul R.; Mottram, J. C.; Davies, Ben; Stead, Joseph J.

doi:10.1051/0004-6361/200912608

Cited by 56 publications

(39 citation statements)

References 36 publications

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“…CS (Bronfman et al 1996) and H 2 O maser emission (Urquhart et al 2009) are reported close to the source location. The RMS catalogue provides a distance of 3.9 kpc and a bolometric luminosity of 9 × 10 3 L .…”

Section: B9 Iras 15450-5431mentioning

confidence: 65%

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A near-infrared spectroscopic survey of massive jets towards extended green objects

Garatti

Stecklum

Linz

et al. 2014

A&A

111

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Context. Protostellar jets and outflows are the main outcome of the star formation process, and their analysis can provide us with major clues about the ejection and accretion history of young stellar objects (YSOs). Aims. We aim at deriving the main physical properties of massive jets from near-infrared (NIR) observations, comparing them to those of a large sample of jets from low-mass YSOs, and relating them to the main features of their driving sources. Methods. We present a NIR imaging (H 2 and K s ) and low-resolution spectroscopic (0.95−2.50 μm) survey of 18 massive jets towards GLIMPSE extended green objects (EGOs), driven by intermediate-and high-mass YSOs, which have bolometric luminosities (L bol ) between 4 × 10 2 and 1.3 × 10 5 L . Results. As in low-mass jets, H 2 is the primary NIR coolant, detected in all the analysed flows, whereas the most important ionic tracer is [Fe ii], detected in half of the sampled jets. Our analysis indicates that the emission lines originate from shocks at high temperatures and densities. No fluorescent emission is detected along the flows, regardless of the source bolometric luminosity. On average, the physical parameters of these massive jets (i.e. visual extinction, temperature, column density, mass, and luminosity) have higher values than those measured in their low-mass counterparts. The morphology of the H 2 flows is varied, mostly depending on the complex, dynamic, and inhomogeneous environment in which these massive jets form and propagate. All flows and jets in our sample are collimated, showing large precession angles. Additionally, the presence of both knots and jets suggests that the ejection process is continuous with burst episodes, as in low-mass YSOs. We compare the flow H 2 luminosity with the source bolometric luminosity confirming the tight correlation between these two quantities. Five sources, however, display a lower L H 2 /L bol efficiency, which might be related to YSO evolution. Most important, the inferred L H 2 vs. L bol relationship agrees well with the correlation between the momentum flux of the CO outflows and the bolometric luminosities of high-mass YSOs indicating that outflows from high-mass YSOs are momentum driven, as are their low-mass counterparts. We also derive a less stringent correlation between the inferred mass of the H 2 flows and L bol of the YSOs, indicating that the mass of the flow depends on the driving source mass. Conclusions. By comparing the physical properties of jets in the NIR, a continuity from low-to high-mass jets is identified. Massive jets appear as a scaled-up version of their low-mass counterparts in terms of their physical parameters and origin. Nevertheless, there are consistent differences such as a more variegated morphology and, on average, stronger shock conditions, which are likely due to the different environment in which high-mass stars form.

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Section: B9 Iras 15450-5431mentioning

confidence: 65%

“…CS emission (Bronfman et al 1996), OH (Caswell 1998), CH 3 OH (Green et al 2012) and H 2 O (Urquhart et al 2009) masers are detected on the source and in its surroundings. Faúndez et al (2004) detected the continuum emission from the source at 1.2 mm, and estimated L bol = 7.1 × 10 4 L and M c = 1.1 × 10 3 M from SED analysis.…”

Section: B4 Iras 13484-6100mentioning

confidence: 94%

A near-infrared spectroscopic survey of massive jets towards extended green objects

Garatti

Stecklum

Linz

et al. 2014

A&A

111

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“…We get 2 ± 1 kpc for the spectrophotometric distance. Some Hii regions and YSOs with measured RVs are found near the cluster (Urquhart et al 2007(Urquhart et al , 2009). On average, we get a kinematic distance to the system of 4.3 kpc, which is in agreement with our spectroscopic distance.…”

Section: Vvv Cl036mentioning

confidence: 93%

Massive open star clusters using the VVV survey

Chené

Borissova

Bonatto

et al. 2013

A&A

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Context. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Nearly 150 new open clusters and cluster candidates have been discovered in this survey. Aims. This is the second in a series of papers about young, massive open clusters observed using the VVV survey. We present the first study of six recently discovered clusters. These clusters contain at least one newly discovered Wolf-Rayet (WR) star. Methods. Following the methodology presented in the first paper of the series, wide-field, deep JHK s VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. We find that the six studied stellar groups are real young (2-7 Myr) and massive (between 0.8 and 2.2 × 10 3 M ) clusters. They are highly obscured (A V ∼ 5−24 mag) and compact (1-2 pc). In addition to WR stars, two of the six clusters also contain at least one red supergiant star, and one of these two clusters also contains a blue supergiant. We claim the discovery of 8 new WR stars, and 3 stars showing WR-like emission lines which could be classified WR or OIf. Preliminary analysis provides initial masses of ∼30-50 M for the WR stars. Finally, we discuss the spiral structure of the Galaxy using the six new clusters as tracers, together with the previously studied VVV clusters.

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“…The Red MSX Source (RMS) survey (Lumsden et al 2002;Mottram et al 2011) contains a large list of objects measured in 2MASS, MSX, Spitzer, and reprocessed IRAS/IGAL images for objects along the Galactic plane, including ultra-compact (UC) H ii regions and a large sample of MYSOs. Additional observations were used to separate the MYSOs from UCH iis, such as water masers (Urquhart et al 2009b(Urquhart et al , 2011 and centimetric emission (Urquhart et al , 2009a. Recently, the bolometric fluxes of those sources were derived by Mottram et al (2011) using IR and submillimetric data and adopting the kinematic distances derived by CO observations from Urquhart et al ( , 2008 and a spectral energy distribution (SED) model.…”

Section: Introductionmentioning

confidence: 99%

A survey of extended H2 emission from massive YSOs

Navarete¹,

Damineli²,

Barbosa

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We present the results from a survey, designed to investigate the accretion process of massive young stellar objects (MYSOs) through near infrared narrow band imaging using the H 2 ν=1-0 S(1) transition filter. A sample of 353 Massive Young Stellar Object (MYSO) candidates was selected from the Red MSX Source survey using photometric criteria at longer wavelengths (infrared and submillimeter) and chosen with positions throughout the Galactic Plane. Our survey was carried out at the SOAR Telescope in Chile and CFHT in Hawaii covering both hemispheres. The data reveal that extended H 2 emission is a good tracer of outflow activity, which is a signpost of accretion process on young massive stars. Almost half of the sample exhibit extended H 2 emission and 74 sources (21%) have polar morphology, suggesting collimated outflows. The polar-like structures are more likely to appear on radio-quiet sources, indicating these structures occur during the pre-UCH ii phase. We also found an important fraction of sources associated with fluorescent H 2 diffuse emission that could be due to a more evolved phase. The images also indicate only ∼23% (80) of the sample is associated with extant (young) stellar clusters. These results support the scenario in which massive stars are formed by accretion disks, since the merging of low mass stars would not produce outflow structures.

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The RMS survey

Cited by 56 publications

References 36 publications

A near-infrared spectroscopic survey of massive jets towards extended green objects

A near-infrared spectroscopic survey of massive jets towards extended green objects

Massive open star clusters using the VVV survey

A survey of extended H2 emission from massive YSOs

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