A search for 51–60 A+ -methanol masers towards faint IRAS sources

Walt, D. J. van der; Retief, S. J. P.; Gaylard, M. J.; MacLeod, G. C.

doi:10.1093/mnras/282.3.1085

Cited by 37 publications

(25 citation statements)

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“…In general, 6.7 GHz methanol masers seem to be more efficiently detected towards bright IRAS sources, having F 60 > 100 Jy (van der Walt et al 1996;, with a clearly higher detection rate in the inner than in the outer Galaxy . Early attempts to find a correlation between the associated IRAS flux density with the maser flux density gave no positive results.…”

Section: Introductionmentioning

confidence: 90%

“…Beside the probabilistic approach presented in van der Walt et al (1996), another way to solve the heliocentric distance ambiguity is the observation of Hi self-absorption. The method relies on the fact that molecular clouds have an outer layer of neutral hydrogen which can absorb the ubiquitous background galactic Hi emission.…”

Section: Modelling the Maser Distribution And Luminosity Functionmentioning

confidence: 99%

“…Early attempts to find a correlation between the associated IRAS flux density with the maser flux density gave no positive results. In van der Walt et al (1995) the authors are left with the fact that the maser flux densities are smaller than the 100 µm ones, suggesting that the masers could be pumped by the 100 µm photons. The lack of correlation between maser flux density and IR flux density is not explained in that work.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the high correspondence of 6.7 GHz methanol masers with OH masers, Caswell et al (1995) assume that the luminosity function of 6.7 GHz methanol masers should be similar to the one for OH masers (see Caswell & Haynes 1987) from which they conclude that there must be some 500 methanol maser sources in the Galaxy. In van der Walt et al (1996), the ambiguity of kinematic distances is solved in a probabilistic way. When the decision was not clearly made on the basis of the total luminosity of the IRAS source hosting the maser, the source was assigned a probability for it to lie at the near heliocentric distance.…”

Section: Introductionmentioning

confidence: 99%

“…We aim to constrain the luminosity function, and begin by modelling the spatial distribution of methanol masers in our Galaxy. This approach is different from the one presented in van der Walt et al (1996) and van der Walt (2005), where the authors apply a random choice algorithm to solve the heliocentric distance ambiguity for sources on galactic orbits internal to the Sun. Our starting point is the distribution of methanol masers in (kinematic) galactocentric distance, which is unique once a rotation curve for the Galaxy is assumed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A general catalogue of 6.7 GHz methanol masers

Pestalozzi

Chrysostomou

Collett

et al. 2006

A&A

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Context. Methanol masers at 6.7 GHz are recognised markers of high-mass star formation regions. The study of their distribution in the Galaxy gives important insights into the star formation activity of the Milky Way. We present a statistical analysis on the General Catalogue of 6.7 GHz methanol masers in the Galaxy with the aim of extracting global properties of the masers. Aims. We provide constraints on the luminosity function of 6.7 GHz methanol masers and on their total number in the Galaxy. Methods. We model the spatial distribution of the masers in the Milky Way by using their distribution in galactocentric distance which is unambiguous once a rotation curve for the Galaxy is assumed. This is the starting point for determining the luminosity function of the masers.Results. The luminosity function of 6.7 GHz methanol masers is modelled as a power-law with sharp cutoffs and having an index lying between −1.5 and −2. We also predict the number of detections of methanol masers assuming different sensitivity limits in the observations.

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Section: Introductionmentioning

confidence: 90%

Section: Modelling the Maser Distribution And Luminosity Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A general catalogue of 6.7 GHz methanol masers

Pestalozzi

Chrysostomou

Collett

et al. 2006

A&A

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show abstract

The Torun catalogue of 6.7 GHz methanol masers

et al. 2012

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We report the observations of 289 methanol maser sources at 6.7 GHz obtained over a two month period with the Torun 32 m telescope. The data form a catalogue of all objects north of δ = –22° brighter than 7.5 Jy in the peak emission. The positions of sub‐arcsecond accuracy are updated for 76 % of the objects. We find that about one third of the sources show changes in the peak fluxes by a factor of two or more on time scales of 8.5–9.5 years (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Study of star formation in RCW 106 using far-infrared observations

Karnik

Ghosh

Rengarajan

et al. 2001

Monthly Notices of the Royal Astronomical Society

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High‐resolution far‐infrared observations of a large area of the star‐forming complex RCW 106 obtained using the TIFR 1‐m balloon‐borne telescope are presented. Intensity maps have been obtained simultaneously in two bands centred around 150 and 210 μm. Intensity maps have also been obtained in the four IRAS bands using HIRES‐processed IRAS data. From the 150‐ and 210‐μm maps, reliable maps of dust temperature and optical depth have been generated. The star formation in this complex has occurred in five linear sub‐clumps. Using the map at 210 μm, which has a spatial resolution superior to that of IRAS at 100 μm, 23 sources have been identified. The spectral energy distribution (SED) and luminosity of these sources have been determined using the associations with the IRAS maps. The luminosity distribution of these sources has been obtained. Assuming these embedded sources to be zero‐age main‐sequence stars and using the mass–luminosity relation for these, the power‐law slope of the initial mass function is found to be −1.73±0.5. This index for this very young complex is about the same as that for more evolved complexes and clusters. Radiation transfer calculations in spherically symmetric geometry have been undertaken to fit the SEDs of 13 sources with fluxes in both the TIFR and the IRAS bands. From this, the r−2 density distribution in the envelopes is ruled out. Finally, a correlation is seen between the luminosity of embedded sources and the computed dust masses of the envelopes.

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A search for 51–60 A+ -methanol masers towards faint IRAS sources

Cited by 37 publications

References 0 publications

A general catalogue of 6.7 GHz methanol masers

A general catalogue of 6.7 GHz methanol masers

The Torun catalogue of 6.7 GHz methanol masers

Study of star formation in RCW 106 using far-infrared observations

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