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J/AJ/106/530       Low surface brightness disk galaxies          (Bothun+, 1993)

The small scale environment of low surface brightness disk galaxies BOTHUN G.D., SCHOMBERT J.M., IMPEY C.D., SPRAYBERRY D., MCGAUGH S.S. <Astron. J. 106, 530 (1993)> =1993AJ....106..530B (SIMBAD/NED Reference)
ADC_Keywords: Galaxies, optical; Redshifts Abstract: We use a sample of approximately 340 low surface brightness (LSB) disk galaxies with measured redshifts in combination with the Center for Astrophysics redshift survey to test the hypothesis that LSB galaxies have a deficit of nearby companion galaxies compared to high surface brightness (HSB) disk galaxies. We find a very strong statistical deficit of galaxies located within a projected radius of 0.5 Mpc and within a velocity of 500 km/s around LSB disk galaxies compared to HSB ones. Further, comparing LSB and HSB disk galaxies which are located in the same portion of the sky indicates that the average distance to the nearest neighbor is 1.7 times farther for LSB disk galaxies. A Komologorov-Smirnoff test rules out, at greater than the 99% confidence level, the hypothesis that the distribution of nearest-neighbor distances is the same for HSB and LSB disk galaxies. We speculate that LSB disk galaxies have relatively long formation time scales and therefore must form in relative isolation. In addition, the lack of tidal interactions over a Hubble time serves to suppress the overall star-formation rate as no external trigger is available to help clump the gas. The observed low surface densities of HI in combination with the low probability of tidal interactions effectively prevents these disk galaxies from evolving very rapidly. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 43 86 Summary of Counts table2 75 12 *Difference in mean counts table3 50 15 Nearest-neighbor summary table4 69 38 The most isolated LSB galaxies table5 80 37 The most popular LSB galaxies tables.tex 109 310 Tex version of the tables format.tex 85 365 Format for tables.tex
Note on table2: This table summarizes the differences between the means, in units of sigma, in the comparison of various LSB and HSB samples. The POSS and APM samples are compared at radii of 0.5, 1.0, 1.5, and 2.0 Mpc to the total HSB sample as well as to the respective HSB sample that covers the equivalent area of sky.
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 8 A8 --- Sample Sample designation 11- 17 A7 km/s Vrange Velocity range 20- 22 F3.1 Mpc RadProj Projected radius out to which the counts were made 25- 28 I4 --- Ngal Number of galaxies forming the sample mean 31- 32 I2 --- Nrej []? Number of rejected galaxies 35- 38 F4.2 --- <N> Sample mean. In general, mean quantities are calculated after one cycle of 2.5 sigma projection. 40- 43 F4.2 --- e_<N> rms uncertainty in sample mean.
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
1- 8 A8 --- Sample Sample designation 11- 17 A7 km/s Vrange Velocity range 20- 23 F4.1 --- POSS5 []? POSS comparison at 0.5 Mpc radius 25- 27 F3.1 --- POSS5B []? POSS at 0.5 Mpc obtained by considering subset B in comparison to the POSS HSB sample 30- 32 F3.1 --- POSS10 []? POSS comparison at 1.0 Mpc radius 34- 36 F3.1 --- POSS10B []? POSS at 1.0 Mpc considering subset B 39- 41 F3.1 --- POSS15 []? POSS comparison at 1.5 Mpc radius 43- 45 F3.1 --- POSS15B []? POSS at 1.5 Mpc considering subset B 48- 50 F3.1 --- POSS20 []? POSS comparison at 2.0 Mpc radius 52- 54 F3.1 --- POSS20B []? POSS at 2.0 Mpc considering subset B 57- 60 F4.1 --- APM5 []? APM comparison at 0.5 Mpc radius 62- 65 F4.1 --- APM10 []? APM comparison at 1.0 Mpc radius 68- 70 F3.1 --- APM15 []? APM comparison at 1.5 Mpc radius 72- 75 F4.1 --- APM20 []? APM comparison at 2.0 Mpc radius
Note: Table2 summarizes the differences between the means, in units of sigma, in the comparison of various LSB and HSB samples. The POSS and APM samples are compared at radii of 0.5, 1.0, 1.5, and 2.0 Mpc to the total HSB sample as well as to the respective HSB sample that covers the equivalent area of sky. Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 8 A8 --- Sample Sample designation 11- 14 I4 --- Ngal Number of galaxies which have at least one companion within a projected radius of 2.0 Mpc 17- 23 A7 km/s Vrange Velocity range 26- 29 F4.2 Mpc Dist Mean projected distance to the nearest companion 31- 34 F4.2 Mpc e_Dist rms uncertainty on mean projected distance 37- 39 F3.2 --- DmaxPOSS []? KS statistic, Dmax, for the POSS sample 41- 42 I2 --- cl_DmaxPOSS []? Confidence level that Dmax exceeds 45- 47 F3.2 --- DamxAPN []? KS statistic, Dmax, for the APM sample 49- 50 I2 --- cl_DmaxAPM []? Confidence level that Dmax exceeds
Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
1- 7 A7 --- Name Galaxy name 10- 13 A4 --- Sample Sample designation (POSS or APM) 16- 17 I2 h RAh Right ascension 1950 19- 20 I2 min RAm Right ascension 1950 22- 25 F4.1 s RAs Right ascension 1950 27 A1 --- DE- Declination sign 28- 29 I2 deg DEd Declination 1950 31- 32 I2 arcmin DEm Declination 1950 34- 35 I2 arcsec DEs Declination 1950 38- 41 I4 km/s Vel Velocity 44- 69 A26 --- Com Comments
Byte-by-byte Description of file: table5
Bytes Format Units Label Explanations
1- 7 A7 --- Name Galaxy name 10- 13 A4 --- Sample Sample designation (POSS or APM) 16- 17 I2 h RAh Right ascension 1950 19- 20 I2 min RAm Right ascension 1950 22- 25 F4.1 s RAs Right ascension 1950 27 A1 --- DE- Declination sign 28- 29 I2 deg DEd Declination 1950 31- 32 I2 arcmin DEm Declination 1950 34- 35 I2 arcsec DEs Declination 1950 38- 41 I4 km/s Vel Velocity 44- 51 A8 --- BrightGal Name of the brightest galaxy within 2 Mpc or a known structure near the galaxy 54- 80 A27 --- Com Comments
Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 25-Jul-1994
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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