J/A+AS/126/503 Southern spiral galaxies scaleheights (Ma+ 1997)
Scaleheights of 486 southern spiral galaxies and some statistical correlation
Ma J., Peng Q., Chen R., Ji Z., Tu C.
<Astron. Astrophys. Suppl. Ser. 126, 503 (1997)>
=1997A&AS..126..503M 1997A&AS..126..503M
ADC_Keywords: Galaxies, optical ; Morphology
Keywords: galaxies: fundamental parameters - galaxies: spiral -
galaxies: structure
Abstract:
Based on Peng's method (1988A&A...206...18P 1988A&A...206...18P), we obtain scaleheights
of 486 southern spiral galaxies, the images of which are taken from
the Digitized Sky Survey at Xinglong Station of Beijing Astronomical
Observatory. The fitted spiral arms of 70 galaxies are compared with
their images to get their optimum inclinations. The scaleheights of
other 416 ones are listed in Table 1 in Appendix. After compiling and
analyzing the data, we find some statistical correlations. The most
interesting results are that a flatter galaxy is bluer and looks
brighter, and galaxies become flatter along the Hubble sequence
Sab-Scd.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 102 414 *The Measuring and Fitting Results
tablea1.tex 159 569 *LaTeX version of tablea1
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Note on files tablea1.dat, tablea1.tex: many invalid NGC designations
have been removed in May 1998 (see the "History" section below),
The corrections have NOT been performed on the latex version.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- NGC *NGC name
9- 16 A8 --- PGC PGC name
19- 25 A7 --- MType Mean revised morphological type
27- 30 F4.1 deg gamma *Optimum inclination of the galaxy
32- 36 F5.1 Mpc Dist ? Distance of the galaxy from the
Galactic Center
38- 43 F6.4 --- H/D25 Flatness of the galaxy
45- 50 F6.1 % e_H/D25 rms uncertainty on H/D25
52- 57 F6.4 arcmin h Apparent scaleheight of a galaxy
59- 64 F6.1 % e_h rms uncertainty on h
66- 69 F4.2 kpc H ? Scaleheight of the galactic disk
71- 75 F5.1 % e_H ? rms uncertainty on H
77- 81 F5.2 --- LAMDBA Wound parameter of a spiral arm
83- 88 F6.1 % e_LAMDBA rms uncertainty on LAMDBA
90- 95 F6.4 arcmin rho0 Angular diameter of the innermost point
of the spiral arm from the Galactic Center
97-102 F6.4 --- SR Standard deviation discussed in Peng's paper
(1988A&A...206...18P 1988A&A...206...18P).
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Note on NGC: many invalid NGC designations have been removed in May 1998
(see the "History" section below); the corrections have however NOT
been performed on the latex version.
Note on gamma: gamma is defined by the equation
gamma = arccos(d25/D25), where d25 and D25 are the minor
and major isophotal diameters measured at or reduced to the
surface brightness level muB=25.0B-m/ss.
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Acknowledgements: Jun Ma
History:
* 06-Jun-1997: LaTeX version received and archived at CDS from
Jun Ma ()
* 09-May-1998: M. Schmitz () communicated
the problem of wrong NGC numbers in many entries of the table.
The NGC designations were removed in entries for which the PGC
(Cat. VII/119) does not list a NGC cross-identification;
the latex version of the table was not modified.
(End) Patricia Bauer, Francois Ochsenbein [CDS] 09-May-1998