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 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)
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12 25 48.9 +33 32 48 NGC 4395
14 03 12.5 +54 20 53 NGC 5457
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File Summary:
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FileName Lrecl Records Explanations
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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 75 158 NGC 4395 region positions, extinction, H-alpha
fluxes, H-beta fluxes and equivalent widths
table7.dat 32 158 NGC 4395 [OII],[OIII] and [SII] fluxes
table8.dat 30 158 NGC 4395 R23 parameter and oxygen abundance
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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
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Bytes Format Units Label Explanations
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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)
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Byte-by-byte Description of file: table4.dat table7.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table5.dat table8.dat
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Bytes Format Units Label Explanations
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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
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Note (1): The oxygen abundance was obtained using Zaritsky et al.
(1994ApJ...420...87Z 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++]
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Acknowledgements: Bernabe Cedres
(End) Patricia Bauer [CDS] 13-May-2002