J/A+A/306/9 PNe and HII in NGC 300 (Soffner+, 1996)
Planetary nebulae and HII regions in NGC 300.
Soffner T., Mendez R.H., Jacoby G.H., Ciardullo R., Roth M.M.,
Kudritzki R.P.
<Astron. Astrophys. 306, 9 (1996)>
=1996A&A...306....9S 1996A&A...306....9S
ADC_Keywords: Planetary nebulae
Keywords: galaxies: individual (NGC 300), ISM, distances -
planetary nebulae: general, luminosity function
Abstract:
We report a search for planetary nebulae and H II regions in the
central part of the late-type spiral NGC 300, using a CCD and the
on-band/off-band filter technique. The total exposure time for all
frames was 4 hours. We have identified 34 PNs and 88 H II regions. We
construct the cumulative [O III] λ5007 PN luminosity function
(PNLF) and obtain a distance modulus of 26.9±0.4, in satisfactory
agreement with the Cepheid distance modulus (26.7±0.1). We make a
general comparison between Cepheid and PNLF distances, showing that
they are in excellent overall agreement. NGC 300 is in principle one
of the best possible calibrators of the PNLF method of distance
determination, to be preferentially applied, like the LMC, in cases of
populations with recent star formation (as opposed to the bulge of
M 31, which has served as calibrator for populations without recent
star formation).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 58 38 Planetary nebulae in NGC 300
tab3-5.dat 79 90 H II regions in NGC 300
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See also:
J/ApJ/339/53 : Planetary nebulae as standard candles. II. (Ciardullo+, 1989)
J/ApJ/344/704 : Planetary nebulae as standard candles. III. (Jacoby+, 1989)
J/ApJ/344/715 : Planetary nebulae as standard candles. IV. (Ciardullo+, 1989)
J/ApJ/356/332 : Planetary nebulae as standard candles. V. (Jacoby+, 1990)
J/ApJ/365/471 : Planetary nebulae as standard candles. VI. (Jacoby+, 1990)
J/ApJ/383/487 : Planetary nebulae as standard candles. VII. (Ciardullo+, 1991)
J/ApJ/416/62 : Planetary nebulae as standard candles. IX. (McMillan+, 1993)
J/ApJ/462/1 : Planetary nebulae as standard candles. X. (Jacoby+, 1996)
J/ApJ/479/231 : Planetary nebulae as standard candles. XI. (Feldmeier+, 1996)
J/ApJ/577/31 : Planetary nebulae as standard candles. XII. (Ciardullo+, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- PN PN number in the galaxy ([SMJ96] PN NN)
4 A1 --- Field [ECW] Field designation
6- 11 F6.2 pix Xpos X position
13- 18 F6.2 pix Ypos Y position
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 29 F4.1 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 47 F5.2 mag m5007 ? m5007Å magnitude (1)
49- 52 F4.2 mag e_m5007 ? rms uncertainty on m5007
54- 58 F5.2 10-19W/m2 I(Halpha) ? Hα intensity
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Note (1): m5007 = -2.5log(I5007) - 13.74
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Byte-by-byte Description of file: tab3-5.dat
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Bytes Format Units Label Explanations
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1 A1 --- Field [ECW] Field designation (1)
2- 3 I2 --- HII H II number in the field (1)
6 I1 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 30 I3 pix Xpos X position
32- 34 I3 pix Ypos Y position
36- 38 I3 pix Size Size in pixels
40- 45 F6.1 10-19W/m2 I(Halpha) ? Hα intensity
47- 51 F5.1 10-19W/m2 I(5007) ? 5007Å line intensity
53- 56 F4.1 % DI(5007) ? Relative 5007Å line intensity
58- 71 A14 --- Notes Description and notes (2)
73- 79 A7 --- Name Other name (D NNN = [DCL88] NNN in Simbad)
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Note (1): In Simbad, HII regions identified as [SMJ96] HII CNN
C 1 = E25; W 1 = C32
Note (2): In a few cases the flux given are the addition of fluxes
from two adjacent objects. These cases are marked by giving both
objects numbers, joined by a + sign.
The excitation classes L, M and H correspond to low, medium and high
excitation, respectively.
Notes:
1: starlike source, but star visible on "off"-band; therefore the
object is rejected as a PN
2: elongated
3: the object may be a very low-excitation PN. Poor seeing does not
permit to decide.
4: object too close to edge of frame; fluxes not measured
5: adjacent objects could not be separated; fluxes not measured
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Table 6 : Comparison of Cepheid and PNLF distances
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Galaxy E(B-V) D(PNLF) Ref E(B-V) D(Cepheid) Ref
PNLF Mpc Cepheid Mpc
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LMC 0.10 0.050± 0.005 1 0.14 0.050± 0.003 2.3
M 31 0.08 0.77 ± 0.04 4 vary 0.77 ± 0.04 5
NGC 300 0.00 2.40 ± 0.48 - 0.00 2.19 ± 0.11 6
M 81 0.10 3.60 ± 0.44 7 0.03 3.63 ± 0.34 8
NGC 5253 0.05 3.73 ± 0.57 b 9 0.05 3.87 ± 0.28 c 10
Virgo/4571 0.02 15.42 ± 1.03 11 0.00 14.90 ± 1.20 12
Virgo/4321 0.02 15.42 ± 1.03 11 0.05 17.10 ± 1.80 13
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Notes:
a: All planetary nebula luminosity function (PNLF) distances, except
NGC 300, have been calculated relative to the calibrator, M 31,
assuming it has D=0.77Mpc, and E(B-V)=0.08.
b: Adjusted for metallicity by -0.28±0.10mag in distance modulus
following Ciardullo & Jacoby (1992ApJ...388..268C 1992ApJ...388..268C).
c: Saha et al. (1995ApJ...438....8S 1995ApJ...438....8S) value, adjusted for the
Burstein & Heiles (1984ApJS...54...33B 1984ApJS...54...33B) foreground reddening as
adopted for the PNLF.
References:
1: Jacoby et al., 1990, Cat. J/ApJ/365/471
2: Feast & Walker, 1987ARA&A..25..345F 1987ARA&A..25..345F
3: Welch et al., 1987ApJ...321..162W 1987ApJ...321..162W
4: Ciardullo et al., 1989, Cat. J/ApJ/339/53
5: Freedman & Madore, 1990ApJ...365..186F 1990ApJ...365..186F
6: Freedman et al., 1992ApJ...396...80F 1992ApJ...396...80F
7: Jacoby et al. 1989, Cat. J/ApJ/344/704
8: Freedman et al., 1994ApJ...427..628F 1994ApJ...427..628F
9: Jacoby & Ciardullo 1993IAUS..155..503J 1993IAUS..155..503J
10: Saha et al., 1995ApJ...438....8S 1995ApJ...438....8S
11: Jacoby et al. 1990ApJ...356..332J 1990ApJ...356..332J
12: Pierce et al., 1994Natur.371..385
13: Freedman et al., 1994Natur.371..757F 1994Natur.371..757F
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History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 14-Jan-2003