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J/A+A/501/539       RMS survey. 6cm observations of YSOs    (Urquhart+, 2009)

The RMS survey. 6 cm continuum VLA observations towards candidate massive YSOs in the northern hemisphere. Urquhart J.S., Hoare M.G., Purcell C.R., Lumsden S.L., Oudmaijer R.D., Moore T.J.T., Busfield A.L., Mottram J.C., Davies B. <Astron. Astrophys., 501, 539-551 (2009)> =2009A&A...501..539U
ADC_Keywords: YSOs ; Radio sources ; Infrared sources ; Morphology Keywords: radio continuum: ISM - stars: formation - stars: early-type - stars: pre-main sequence Abstract: The Red MSX Source (RMS) survey is an ongoing multi-wavelength observational programme designed to return a large, well-selected sample of massive young stellar objects (MYSOs). We have identified ∼2000 MYSO candidates located throughout the Galaxy by comparing the colours of MSX and 2MASS point sources to those of known MYSOs. The aim of these follow-up observations is to identify other objects with similar colours such as ultra compact (UC) HII regions, evolved stars and planetary nebulae (PNe) and distinguish between genuine MYSOs and nearby low-mass YSOs. To identify the populations of UCHII regions and PNe within the sample and examine their Galactic distribution. We have conducted high resolution radio continuum observations at 6cm towards 659 MYSO candidates in the northern hemisphere (10°<l<250°) using the Very Large Array (VLA). These observations have a spatial resolution of ∼1-2" and typical image rms noise values of ∼0.22mJy - sensitive enough to detect a HII region powered by B0.5 star at the far side of the Galaxy. In addition to these targeted observations we present archival data towards a further 315 RMS sources extracted from a previous VLA survey of the inner Galaxy. Description: Results of a set of VLA observations towards an MSX and 2MASS colour selected sample of massive young stellar candidates. Table 3: Field names, positions, observational rms values; Table 4: detected radio sources their parameters and associated MSX point sources; Table 5: RMS-radio matches. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 49 1068 Field positions and restoring beam parameters table4.dat 107 669 VLA radio detection catalogue table5.dat 105 344 Parameters for radio sources found to be associated with RMS sources fig2/* 0 2007 *Images (1'x1') of all radio sources detected by these targeted VLA observations for table4 sources (files in FITS, EPS and PNG format) fig4/* 0 544 *Contour maps of the RMS-radio matches found from the targeted VLA observations and those found in the White et al. (2005, J/AJ/130/586) catalogue for table5 sources (files in EPS and PNG format) fig7/* 0 404 *Examples of the different types of radio loud RMS sources identified for some table5 sources (files in EPS and PNG format)
Note on fig2/*: The source name is printed above each image and shape and orientation of the restoring beam is shown in the lower left corner. Note on fig4/*: The first contour starts at 4σ with the intervening levels determined by a dynamic power-law which is given in the lower right corner of each plot (see text for details). The RMS name is shown above the image and the size of the synthesised beam is shown to scale in the lower left hand corner. The position of the RMS source is marked with a cross. Note on fig7/*: In the top and centre panels we present four HII regions chosen to illustrate the difference kinds of morphologies identified and in the bottom two panels we present an unresolved (left) and resolved (right) PN. These images are composed of the GLIMPSE 3.6, 4.5 and 8.0um bands (coloured blue, green and red respectively) which are overlaid with contours of the detected radio emission (contour levels are as for Fig. 4).
See also: V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/130/586 : Compact radio sources in the galactic plane (White+, 2005) J/A+A/461/11 : Radio observations of MYSO candidates (Urquhart+, 2007) J/A+A/474/891 : 13CO observations of YSOs in South Gal. plane (Urquhart+, 2007) J/A+A/487/253 : The RMS survey: 13CO observations of YSOs (Urquhart+ 2008) : RMS Home Page Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Field Field name (GLLL.llll+BB) 14- 21 F8.4 deg RAdeg Right ascension (J2000) field centre 23- 30 F8.4 deg DEdeg Declination (J2000) field centre 32- 34 F3.1 arcsec beamMaj Beam major axis 36- 38 F3.1 arcsec beamMin Beam minor axis 40- 44 F5.1 deg beamPA Beam position angle 46- 49 F4.2 mJy mJy/beam Image rms (in mJy/beam)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 17 A17 --- RadioName Radio name (GLLL.llll+BB.bbbb) 19- 26 F8.4 deg RAdeg Right ascension (J2000) radio source 28- 35 F8.4 deg DEdeg Declination (J2000) radio source 37- 41 F5.1 arcsec offset Offset from the field centre 43- 54 A12 --- Field Field name 56- 60 F5.1 mJy Sp Peak 6cm radio flux (5GHz) 62- 66 F5.2 mJy e_Sp Peak flux error radio 68- 73 F6.1 mJy Sint Integrated 6cm radio flux 75 A1 --- l_Maj Limit flag on Maj 76- 79 F4.1 arcsec Maj ?=- Source major axis 81- 84 F4.1 arcsec Min ?=- Source minor axis 86- 89 F4.1 arcsec MSXoff ?=- Offset from nearest MSX point source 91-107 A17 --- MSX Name of nearest MSX point source
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 17 A17 --- MSX MSX name (GLLL.llll+BB.bbbb) 19- 35 A17 --- RadioName Radio name (1) 37- 40 F4.1 arcsec Offset Offset between RMS position and radio position 42- 49 F8.4 deg RAdeg Right ascension (J2000) of radio source 51- 58 F8.4 deg DEdeg Declination (J2000) of radio source 60- 65 F6.1 mJy Sp Peak radio flux 67- 72 F6.1 mJy Sint Integrated radio flux 74 A1 --- l_Maj Limit flag on Maj 75- 78 F4.1 arcsec Maj Source major axis 80- 83 F4.1 arcsec Min Source minor axis 85- 90 A6 --- Survey Name of Survey (2) 92-103 A12 --- Type Type of source (3) 105 A1 --- fig7 [*] indicates an image in fig7 subdirectory
Note (1): As given by Table 4 (GLLL.llll+bb.bbbb) or White et al., 2005, Cat. J/AJ/130/586 (LL.lll+B.bbb). Note (2): Name of Survey is: RMS = results presented in Table 4 MAGPIS = results presented by White et al, 2005, Cat. J/AJ/130/586 Note (3): RMS sources have been give one of five difference classifications: HII region, PN, YSO, HII/YSO and Other. The first three of these are obvious, however, the last two require a little explanation. The HII/YSO classification is give to MSX sources that appear to be associated with both an HII region and a YSO. The classification "Other" is given to sources that do not fit into any of the other classification.
Acknowledgements: James Urquhart, james.urquhart(at) History: * 25-Sep-2009: on-line version * 09-Jul-2010: correction in table5, radio position instead of RMS ones
(End) Patricia Vannier [CDS] 25-Sep-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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