Access to Astronomical Catalogues

← Click to display the menu
J/A+A/391/809       HII regions in NGC 5457 and NGC 4395     (Cedres+, 2002)

Distributions, equivalent widths and metallicities of the HII regions in the spiral galaxies NGC 5457 and NGC 4395. Cedres B., Cepa J. <Astron. Astrophys. 391, 809 (2002)> =2002A&A...391..809C
ADC_Keywords: H II regions ; Photometry, H-alpha ; Photometry, H-beta ; Photometry, narrow-band ; Abundances Keywords: HII regions - galaxies: individual: NGC 4395, NGC 5457 - galaxies: abundances Description: Line intensities, visual extinction, abundances and ionization hardness parameter for HII regions in two spiral galaxies are presented. The following galaxies have been observed: NGC 5457 and NGC 4395. In NGC 5457 have been obtained data for 338 regions. In NGC 4395 have been obtained data for 158 regions. For each region position, visual extinction, H-alpha flux, H-alpha equivalent width, H-beta flux, H-beta equivalent width, [OII] flux, [OIII] flux, [SII] flux, [SIII] flux (only for NGC 5457), R23 parameter, oxygen abundance and ionization hardness parameter (only for NGC 5457) are given. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 12 25 48.9 +33 32 48 NGC 4395 14 03 12.5 +54 20 53 NGC 5457 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 76 338 NGC 5457 region positions, extinction, H-alpha fluxes, H-beta fluxes and equivalent widths table4.dat 42 338 NGC 5457 [OII],[OIII], [SII] and [SIII] fluxes table5.dat 41 338 NGC 5457 R23 parameter, oxygen abundance and ionization hardness parameter table6.dat 76 158 NGC 4395 region positions, extinction, H-alpha fluxes, H-beta fluxes and equivalent widths table7.dat 41 158 NGC 4395 [OII],[OIII] and [SII] fluxes table8.dat 41 158 NGC 4395 R23 parameter and oxygen abundance
See also: J/AJ/104/92 : HII Regions Properties in M101 (Scowen+ 1992) J/A+AS/136/35 : WR galaxies and HII regions catalog (Schaerer+ 1999) J/AJ/116/2805 : H II regions in spiral galaxies (Van Zee+, 1998) Byte-by-byte Description of file: table3.dat table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Region Region identification number 5- 8 I4 arcsec Xpos Region X position in galaxy with respect nucleus. East positive 10- 13 I4 arcsec Ypos Region Y position in galaxy with respect nucleus. North positive 15- 18 F4.2 arcmin R Deprojected galactocentric radius 20- 23 F4.2 mag Av Visual extinction 25- 28 F4.2 mag e_Av Error in visual extinction 30- 35 F6.3 10-16W/m2 FHalpha Extinction corrected H-alpha flux 37- 41 F5.3 10-16W/m2 e_FHalpha Error in H-alpha flux 43- 46 F4.2 [0.1nm] EW(Halpha) ? Base 10 logarithm of H-alpha equivalent width 48- 51 F4.2 [0.1nm] e_EW(Halpha) ? Error in H-alpha equivalent width 53- 57 F5.3 10-16W/m2 FHbeta ? Extinction corrected and stellar absorption corrected H-beta flux 59- 63 F5.3 10-16W/m2 e_FHbeta ? Error in H-beta flux 65- 68 F4.2 [0.1nm] EW(Hbeta) ? Base 10 logarithm of H-beta equivalent width 70- 74 F5.2 [0.1nm] e_EW(Hbeta) ? Error in H-beta equivalent width 76 I1 --- Arm ? [0/1] Indicates whether the region belongs to the arm (1) or inter-arm (0) (in table3.dat only)
Byte-by-byte Description of file: table4.dat table7.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Region Region identification number 5- 8 I4 --- [OII] ? [OII] flux relative to H-beta=100 and extinction corrected 9 A1 --- n_[OII] [N] N: NaN 11- 13 I3 --- e_[OII] ? Error in [OII] line 15- 18 I4 --- [OIII] ? [OIII] flux relative to H-beta=100 and extinction corrected 19 A1 --- n_[OIII] [N] N: NaN 21- 23 I3 --- e_[OIII] ? Error in [OIII] line 25- 27 I3 --- [SII] ? [SII] flux relative to H-beta=100 and extinction corrected 28 A1 --- n_[SII] [N] N: NaN 30- 32 I3 --- e_[SII] ? Error in [SII] line 34- 36 I3 --- [SIII] ? [SIII] flux relative to H-beta=100 and extinction corrected (table4.dat only) 37 A1 --- n_[SIII] [N] N: NaN 39- 41 I3 --- e_[SIII] ? Error in [SIII] line
Byte-by-byte Description of file: table5.dat table8.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Region Region identification number 5- 9 F5.2 --- R23 ? R23 parameter (2) 10 A1 --- n_R23 [N] N:NaN 12- 16 F5.2 --- e_R23 ? Error in R23 parameter 18- 22 F5.2 --- 12+log(O/H) ? Oxygen abundance 23 A1 --- n_12+log(O/H) [N] N:NaN 25- 29 F5.2 --- e_12+log(O/H) ? Error in oxygen abundance (1) 31- 35 F5.2 --- eta ? Ionization hardness parameter (table5.dat only) (3) 36 A1 --- n_eta [N] N:NaN 38- 41 F4.2 --- e_eta ? Error in ionization hardness parameter
Note (1): The oxygen abundance was obtained using Zaritsky et al. (1994ApJ...420...87Z) calibration. Note (2): R23 is the ratio {I([OII]3727) + I([OIII]4959,5007)} / I(Hbeta) Note (3): eta is the measurement of the ionisation ratio eta = [O+/O++]/[S+/S++]
Acknowledgements: Bernabe Cedres
(End) Patricia Bauer [CDS] 13-May-2002
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

catalogue service

© UDS/CNRS

Contact