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J/A+A/439/265       Wolf-Rayet population in M83             (Hadfield+, 2005)

A spectroscopic search for the non-nuclear Wolf-Rayet population of the metal-rich spiral galaxy M83. Hadfield L.J., Crowther P.A., Schild H., Schmutz W. <Astron. Astrophys., 439, 265-277 (2005)> =2005A&A...439..265H
ADC_Keywords: Galaxies, spectra ; Equivalent widths ; Stars, variable Keywords: galaxies: individual: M 83 - stars: Wolf-Rayet Abstract: We present a catalogue of non-nuclear regions containing Wolf-Rayet stars in the metal-rich spiral galaxy M 83 (NGC 5236). From a total of 283 candidate regions identified using He II λ4686 imaging with VLT-FORS2, Multi Object Spectroscopy of 198 regions was carried out, confirming 132 WR sources. From this sub-sample, an exceptional content of ∼1035±300 WR stars is inferred, with N(WC)/N(WN) ∼ 1.2, continuing the trend to larger values at higher metallicity amongst Local Group galaxies, and greatly exceeding current evolutionary predictions at high metallicity. Description: We have observed M83 with the ESO Very Large Telescope UT4 (Yepun) and Focal Reduced/Low Dispersion Spectrograph #2 (FORS2). The detector consists of a mosaic of two 2048x1024 MIT/LL CCDs which in conjunction with the standard collimator provides a field-of-view 6.8'x6.8' and an image scale of 0.126"/pixel. Photometric observations of M83 were made between May-June 2002 with follow-up spectroscopic data being acquired during April-June 2003. FORS2 was used on 2 June 2002 to obtain narrow-band images with central wavelengths 4684Å, 4781Å and band widths of 66Å and 68Å respectively. These were obtained consecutively for each Field in seeing conditions between 0.6-0.8" with individual exposures of 1800s. The λ4684 filter is coincident with the strong WR emission features which incorporates the N III (λ4640Å), C III (λ4650Å) and He II (λ4686Å) emission lines, whereas the latter samples a wavelength region relatively free from emission, providing a measure of the continuum level. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 33 18 FORS2 Multi Object Spectroscopy (MOS) observing log for M83. tablea1.dat 202 132 Catalogue of sources with confirmed WR spectroscopic signatures in M83. tablea2.dat 48 89 Catalogue of sources with candidate WR signatures in M83, either from narrow-band imaging or for which MOS spectroscopy was ambiguous.
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY-MM-DD" Date Observation date 12- 17 A6 --- MOD MOD mask 19- 24 A6 s Exp Exposure time(s) 26- 28 F3.1 arcsec Seeing1 DIMM seeing 29 A1 --- --- [,] 31- 33 F3.1 arcsec Seeing2 ? DIMM seeing
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [HCS2005] Sequential number of the source 4 A1 --- n_[HCS2005] [a] Note on [HCS2005] (1) 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 33 F4.2 ---- rho/rho0 De-projected distances are expressed as a fraction of the Holmberg radius rho0=7.3'=9.56kpc 35 A1 --- l_m4686 Limit flag on m4686 36- 39 F4.1 mag m4686 ? He II (4686Å) band magnitude 40 A1 --- n_m4686 [)c] Note on m4686 (G2) 43- 46 F4.1 mag Dm ? Magnitude difference, m4684-m4781 (G3) 47 A1 --- n_Dm [)] ): spectroscopic photometry 49- 52 F4.2 mag E(B-V) ? Reddening 53 A1 --- n_E(B-V) [b] b: average E(B-V) value has been assumed 54 A1 --- l_BMAG Limit flag on BMAG 55- 59 F5.1 mag BMAG ? Absolute B magnitude 60 A1 --- n_BMAG [)] ): spectroscopic photometry 62- 63 I2 --- [DPD83] ? HII region in de Vaucouleurs et al., 1983ApJS...53...17D, [DPD83] NN, number 65 A1 --- l_EWC/He Limit flag on EWCIII/HeII 66- 69 I4 0.1nm EWC/He ? Equivalent width of CIII(4650)/HeII(4686) 71- 73 I3 0.1nm FWHMC/He ? FWHM of CIII/HeII 74- 75 A2 --- n_FWHMC/He [ND] ND for No data 77- 83 E7.2 mW/m2 FC/He ? Observed line flux of CIII/HeII 85- 86 A2 --- n_EWC/He [ND] ND for No data 89 A1 --- l_EWCIII Limit flag on EWCIII 90- 92 I3 0.1nm EWCIII ? Equivalent width of CIII(5696) 94 A1 --- l_FWHMCIII Limit flag on FWHMCIII 95- 96 I2 0.1nm FWHMCIII ? FWHM of CIII 98-104 E7.2 mW/m2 FCIII ? Observed line flux of CIII 106 A1 --- l_EWCIV Limit flag on CIV 107-110 I4 0.1nm EWCIV ? Equivalent width of CIV(5808) 112-114 I3 0.1nm FWHMCIV ? FWHM of CIV 116-122 E7.2 mW/m2 FCIV ? Observed line flux of CIV 124-125 I2 --- WN2-5 ? Number of WN2-5 type stars in the source (4) 127-128 I2 --- WN6-10 ? Number of WN6-10 type stars in the source (4) 130 I1 --- WC4-6 ? Number of WC4-6 type stars in the source (4) 132-133 I2 --- WC7 ? Number of WC7 type stars in the source (4) 135-137 I3 --- WC8-9 ? Number of WC8-9 type stars in the source (4) 139-146 A8 ---- MOS Multi Object Spectroscopy (MOS) mask used 148-150 F3.1 mag e_m4686 ? rms uncertainty on m4686 152-154 F3.1 mag e_Dm ? rms uncertainty on Dm 156-159 F4.2 mag e_E(B-V) ? rms uncertainty on E(B-V) 161-163 F3.1 mag e_BMAG ? rms uncertainty on BMAG 165-171 E7.2 0.1nm e_FWHMC/He ? rms uncertainty on FWHMC/He 173-179 E7.2 0.1nm e_FWHMCIII ? rms uncertainty on FWHMCIII 181-187 E7.2 0.1nm e_FWHMCIV ? rms uncertainty on FWHMCIV 189-190 I2 --- e_WN2-5 ? rms uncertainty on WN2-5 192-193 I2 --- e_WN6-10 ? rms uncertainty on WN6-10 195 I1 --- e_WC4-6 ? rms uncertainty on WC4-6 197-198 I2 --- e_WC7 ? rms uncertainty on WC7 200-202 I3 --- e_WC8-9 ? rms uncertainty on WC8-9
Note (1): 'a' f He II PSF or spectroscopic photometry was unavailable and the average slit loss correction factor has been assumed. Note (4): The number of, and error in, WR stars in each source are estimated from the line luminosities indicated in Sect. 3.2 and a distance of 4.5±0.3Mpc
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [HCS2005] Sequential number of the source 4 A1 --- n_[HCS2005] [pl] Note on [HCS2005] (1) 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 33 F4.2 ---- rho/rho0 De-projected distances are expressed as a fraction of the Holmberg radius rho0=7.3'=9.56kpc 35 A1 --- l_m4686 Limit flag on m4686 36- 39 F4.1 mag m4686 ?=- He II (4686Å) band magnitude 40 A1 --- n_m4686 [c] Note on m4686 (G2) 42- 45 F4.1 mag Dm ?=- Magnitude difference, m4684-m4781 (G3) 47- 48 I2 --- [DPD83] ? HII region in de Vaucouleurs et al., 1983ApJS...53...17D, [DPD83] NN, number
Note (1): Note on [HCS2005] as follows: p = Insufficient S/N for classification l = insufficient spectral coverage for WN identification
Global notes: Note (G2): Notes as follows: c = photometry corresponds to a lower limit as the region is extended ) = spectroscopic photometry Note (G3): Dm corresponds to the HeII/CIII excess emission (at 4684Å) relative to the continuum (4781Å),
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Mar-2006
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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