J/other/PASA/26.439 K-band images of star-forming regions (Longmore+, 2009)
Ks-band, 2.14-um imaging of southern massive star formation regions traced by methanol masers. Longmore S.N., Burton M.G. <Publ. Astron. Soc. Australia, 26, 439-447 (2009)> =2009PASA...26..439L
ADC_Keywords: Infrared sources ; Masers ; Photometry, infrared ; Stars, early-type ; YSOs Keywords: Galaxy: stellar content - masers - infrared: stars - stars: early type - stars: formation Abstract: We present deep, wide-field, Ks-band (2.14-micron) images towards 87 southern massive star formation regions traced by methanol maser emission. Using point-spread function fitting, we generate 2.14-micron point source catalogues (PSCs) towards each of the regions. For the regions between 10°<l<350° and |b|<1, we match the 2.14-micron sources with the GLIMPSE point source catalogue to generate a combined 2.14- to 8.0-micron point source catalogue. We provide this data for the astronomical community to utilise in studies of the stellar content of embedded clusters. Description: For the 87 regions observed, this catalog provides i) 2.14 micron, IRIS2 flux-calibrated fits images, ii) a text file listing the positions, magnitude and magnitude uncertainties of all Ks-band point sources extracted via PSF fitting, and iii) a text file of Ks-band sources matched with those in the GLIMPSE catalog listing the photometry from 2.14 to 8.0 microns. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 117 87 Summary of the data characteristics for each of the regions observed with IRIS2 ks_cat.dat 34 959183 *Position and photometry of Ks-band sources comb_cat.dat 111 90817 *Combined IRIS2 and GLIMPSE catalog fits/* 0 86 Flux-calibrated fits files
Note on comb_cat.dat: IRIS2 Ks-band sources in ks_cat.dat matched with sources in the GLIMPSE PSC. Note on ks_cat.dat: Ks-band sources in the IRIS2 images identified using automated point source fitting and photometry.
See also: J/MNRAS/380/1497 : JHKs+GLIMPSE photometry towards G305.2+0.2 (Longmore+ 2007) Description of file: fits/* A single fits file is provided for each region. The names and target positions are reported in columns 1 to 4 of table1.dat. The magnitude, m, of a source can be calculated using the zero-point magnitude (given by the MAGZERO keyword in each fits header), mZP, which corresponds to the magnitude of a source in the image with a flux count of 1. A source with flux count, f, has a magnitude given by: m=mZP-2.5logf. The field of view of each image is 9.7'x9.7'. However, the 9-point mosaiking pattern means only the inner 5.7'x5.7' are covered by all 9 coaddded frames. A typical sensitivity in the inner region of an uncrowded field for IRIS2 would be ∼19.6mag (5sigma) in good conditions. The image properties towards each region (including sensitivities, completeness, seeing and number of sources) determined from PSF fitting are listed in table1.dat. Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Region Galactic name of the far-IR sources whose fields have been imaged (GLLL.ll+B.bb) (1) 13 A1 --- n_Region [b] Image previously published (1) 15- 27 A13 --- IRAS IRAS name of the far-IR sources whose fields have been imaged (2) 28- 29 I2 h RAh Right ascension (J2000) (2) 31- 32 I2 min RAm Right ascension (J2000) (2) 34- 37 F4.1 s RAs Right ascension (J2000) (2) 39 A1 --- DE- Declination sign (J2000) (2) 40- 41 I2 deg DEd Declination (J2000) (2) 43- 44 I2 arcmin DEm Declination (J2000) (2) 46- 49 F4.1 arcsec DEs Declination (J2000) (2) 51- 54 F4.2 mag e_ZPmag Standard deviation of the difference between the measured IRIS2 and 2MASS magnitudes (in the range 10-12mag) 56- 60 F5.2 mag ZPmag Zero-point magnitude (3) 62- 64 F3.1 mag min Minimum magnitude of sources in region 66- 69 F4.1 mag med Median magnitude of sources in region 71- 74 F4.1 mag max Maximum magnitude of sources in region 76- 79 F4.2 mag e_med Median point-source fitting error in region 81- 84 F4.1 mag min1 Minimum reliable IRIS2 magnitude (4) 86- 89 F4.1 mag m90 90% completeness magnitude estimated from the magnitude histogram 91- 95 I5 --- N Total number of sources detected in IRIS2 field 97-100 F4.2 arcsec FWHM FWHM of the seeing 102-117 A16 --- FITSfile Name of the fits file in subdirectory fits (1)
Note (1): Region names and FITS file names follow the pattern "GLLL.ll+B.bb", i.e. the longitude part contains appropriate number of leading zeroes to fit the pattern, e.g. G001.15-0.12 is used rather than G1.15-0.12. The region G305.20+0.21 has been included in this table for completeness but the catalogue and images can be found in Longmore et al. (2007, Cat. J/MNRAS/380/1497). Note (2): Position of the associated methanol masers from Walsh et al. (1998, Cat. J/MNRAS/301/640). Note (3): MAGZERO, which gives the magnitude in each image corresponding to a flux count of 1, i.e. m=mZP-2.5logf, where f is the number of counts determined for a source of interest in the FITS images Note (4): Corresponding to the maximum flux per field over which the array responded linearly. Sources brighter than which are likely to be affected by saturation.
Byte-by-byte Description of file: ks_cat.dat
Bytes Format Units Label Explanations
1- 8 F8.4 deg RAdeg Right ascension in decimal degrees (J2000) (1) 10- 19 F10.6 deg DEdeg Declination in decimal degrees (J2000) (1) 21- 28 F8.5 mag Ksmag Ks-band magnitude (G1) 30- 34 F5.3 mag e_Ksmag Ks-band magnitude uncertainty (G2)
Note (1): Sources identified as [LB2009] DDD.dddd+DD.dddd in Simbad.
Byte-by-byte Description of file: comb_cat.dat
Bytes Format Units Label Explanations
1- 8 A8 --- --- [SSTGLMC_] 9- 25 A17 --- GLIMPSE Glimpse ID, GLLL.llll+BB.bbbb (1) 27- 34 F8.4 deg RAdeg Right ascension in decimal degrees (J2000) (2) 36- 45 F10.6 deg DEdeg Declination in decimal degrees (J2000) (1) 47- 53 F7.4 mag Ksmag Ks-band magnitude (G1) 55- 59 F5.3 mag e_Ksmag Ks-band magnitude uncertainty (G2) 61- 66 F6.3 mag [3.6] ?=- 3.6 micron magnitude (3) 68- 72 F5.3 mag e_[3.6] ?=- 3.6 micron magnitude uncertainty (3) 74- 79 F6.3 mag [4.5] ?=- 4.5 micron magnitude (3) 81- 85 F5.3 mag e_[4.5] ?=- 4.5 micron magnitude uncertainty (3) 87- 92 F6.3 mag [5.8] ?=- 5.8 micron magnitude (3) 94- 98 F5.3 mag e_[5.8] ?=- 5.8 micron magnitude uncertainty (3) 100-105 F6.3 mag [8.0] ?=- 8.0 micron magnitude (3) 107-111 F5.3 mag e_[8.0] ?=- 8.0 micron magnitude uncertainty (3)
Note (1): ID from the GLIMPSE point-source catalog (see http://www.astro.wisc.edu/sirtf/ and Benjamin et al., 2003PASP..115..953B for details). Note (2): The assumed astrometric uncertainty between the PSCs was taken as 0.3", the uncertainty in 2MASS astrometry. However, as both IRIS2 and GLIMPSE used 2MASS for absolute coordinate reference positions, their relative astrometric uncertainty should be much smaller than this. Using synthetic data sets to test the matching algorithms, we expect to recover 99.8% of the sources correctly with a maximum of 0.1% multiply-matched and 0.12% mismatched sources. Note (3): See http://www.astro.wisc.edu/sirtf/ and Benjamin et al., 2003PASP..115..953B for details.
Global notes: Note (G1): The photometry was calibrated using sources between ∼12th and 14th magnitude in the 2MASS catalogue which were bright but not saturated in the IRIS2 images. Note (G2): The reported uncertainty is the statistical error from the photometric fitting. Systematic uncertainties were estimated using the scatter between the 2MASS and IRIS2 magnitudes after flux calibration (∼0.13mag averaged over all the fields - approximately twice the photometric fitting error). The value for each field is reported in column 5 of Table 1 in LB09. Some of this scatter is likely due to the difference between the IRIS2/2MASS photometric system. Although converting to the 2MASS photometric system may marginally reduce this scatter, the colour correction terms are not characterised for the very red, likely heavily embedded sources of interest in star formation studies. Depending on the field, IRIS2 sources brighter than ∼11th magnitude suffer from saturation. Column "Minrel" in table1.dat gives the minimum reliable magnitude for each region, corresponding to the maximum flux per field over which the array responded linearly. Photometry for stars brighter than this should be taken from the 2MASS catalogue.
Acknowledgements: Steve Longmore, slongmore(at)cfa.harvard.edu
(End) Patricia Vannier [CDS] 26-Nov-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|