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J/A+AS/142/399   BR surface photometry of emission-line galaxies (Vennik+, 2000)

Surface photometry of emission-line galaxies in low density regions. Vennik J., Hopp U., Popescu C.C. <Astron. Astrophys. Suppl. Ser. 142, 399 (2000)> =2000A&AS..142..399V
ADC_Keywords: Galaxies, photometry ; Photometry, surface Keywords: galaxies: photometry - galaxies: fundamental parameters - galaxies: structure - cosmology: large scale structure of Universe Abstract: Detailed B and R surface photometry is performed for 139 faint emission-line galaxies (ELGs) and for 2 non-ELGs. They are a subsample of the ELG sample selected by Popescu et al. (1996A&AS..116...43P, 1998A&AS..133...13P) towards four nearby voids. We derived the isophotal and integral photometric parameters and radial surface brightness (SB) profiles. Our sample consists mostly of low luminosity (<MB>med=-17.7), small linear size (<d25>med=6.0kpc) (H0=75km/s/Mpc) and blue (<B-R>med=0.93) galaxies. About 83% of the studied ELGs belong to the class of Blue Compact Galaxies (BCGs); others are luminous Starburst Nucleus Galaxies (SBNs) and a few interacting pairs. 72% of the ELGs possess a single dominant H II region, while the remaining 28% show multiple knots. Furthermore 71% of the ELGs show regular outer isophotes, and the remaining 29% reveal disturbed outer morphologies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 97 125 Observed model-free photometric data in B and colour characteristics table5.dat 68 16 Observed model-free photometric data in R table6.dat 101 125 Reduced photometric data and exponential model parameters in B and morphological classes table7.dat 91 16 Reduced photometric data and exponential model parameters in R and morphological classes
See also: VII/39 : Bibliography of Surface Photometry of galaxies (Davoust+ 1982) VII/115 : ESO-Uppsala galaxies Surface Photometry Cat. (Lauberts+ 1989) J/A+AS/117/261 : BR surface photometry of galaxies (Vennik+, 1996) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 12 A12 --- HS HS designation (Hamburg Schmidt Survey) 13 A1 --- n_HS [*] *: Isolated galaxies 15- 17 F3.1 arcsec re Effective equivalent radius 19- 22 F4.1 arcsec r25 ? Equivalent radii of the 25Bmag/arcsec2 isophote 24- 27 F4.1 arcsec r26.5 Equivalent radii of the 26.5Bmag/arcsec2 isophote 29- 32 F4.1 mag/arcsec+2 SuBro Observed central surface brightness in B 33 A1 --- u_SuBro Uncertainty flag on SuBr0 35- 39 F5.2 mag/arcsec+2 SuBre Effective surface brightness in B, measured at reff 40 A1 --- u_SuBre Uncertainty flag on SuBre 42- 46 F5.2 mag B25 ? Total B-magnitude, within the 25Bmag/arcsec2 isophote 47 A1 --- u_B25 Uncertainty flag on B25 49- 53 F5.2 mag BT Asymptotic B-magnitude 54 A1 --- u_BT Uncertainty flag on BT 56- 60 F5.2 mag RT ? Asymptotic R-magnitude 61 A1 --- u_RT Uncertainty flag on RT 63- 67 F5.2 mag (B-R)e ? B-R colour index, measured at reff 68 A1 --- u_(B-R)e Uncertainty flag on CIe 70- 73 F4.2 mag (B-R)25 ? B-R colour index, measured at the 25Bmag/arcsec2 isophote 74 A1 --- u_(B-R)25 Uncertainty flag on CI25 76- 77 A2 --- Grad [± :] Colour gradient classification (1) 79- 82 F4.2 --- b/a ? Mean minor-to-major axis ratio 84- 86 I3 deg PA ? Position angle, measured counterclockwise from North 87 A1 --- u_PA Uncertainty flag on PA 89- 92 F4.2 --- c(in) Light concentration index cin= L(0.3r25)/L(r_25) 94- 97 F4.2 --- c(31) ? Light concentration index c31 = r(3/4LT)/r(1/4LT)
Note (1): Colour gradient classification use the following symbols: + = definitely positive, i.e. with blue center and getting redder outwards +: = probably positive - = definitely negative -: = probably negative blank = no gradients
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 12 A12 --- HS HS designation (Hamburg Schmidt Survey) 14- 16 F3.1 arcsec re Effective radius 18- 21 F4.1 arcsec r24 Equivalent radii of the 24Rmag/arcsec2 isophote 23- 26 F4.1 arcsec r25.5 Equivalent radii of the 25.5Rmag/arcsec2 isophote 28- 31 F4.1 mag/arcsec+2 SuBro Observed central surface brightness in R 33- 37 F5.2 mag/arcsec+2 SuBre Effective surface brightness in R, measured at reff 39- 43 F5.2 mag R24 ? Total R-magnitude, within the 24Bmag/arcsec2 isophote 45- 49 F5.2 mag RT Asymptotic R-magnitude 51- 54 F4.2 --- b/a ? Mean minor-to-major axis ratio 56- 58 I3 deg PA ? Position angle, measured counterclockwise from North 60- 63 F4.2 --- c(in) Light concentration index cin= L(0.3r24)/L(r_24) 65- 68 F4.2 --- c(31) Light concentration index c31 = r(3/4LT)/r(1/4LT)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 12 A12 --- HS HS designation (Hamburg Schmidt Survey) 13 A1 --- n_HS [*] *: Isolated galaxies 15- 20 F6.1 Mpc Dist Distance 22- 27 F6.2 mag BMAG Absolute B magnitude 28 A1 --- u_BMAG Uncertainty flag on BMAG 30- 33 F4.1 kpc reL Effective equivalent radius 34 A1 --- u_reL Uncertainty flag on reL 36- 39 F4.1 kpc r25L ? Equivalent radii of the 25Bmag/arcsec2 isophote 40 A1 --- u_r25L Uncertainty flag on r25L 42- 44 F3.1 kpc rHII ? Seeing corrected approximate linear size of the star-forming regions, measured in the B band 45 A1 --- u_rHII Uncertainty flag on rHII 47- 50 F4.1 arcsec 1/alpha ? Exponential model scale length (") (1) 51 A1 --- u_1/alpha Uncertainty flag on 1/alpha 53- 55 F3.1 kpc 1/alphaL ? Exponential model scale length (kpc) 56 A1 --- u_1/alphaL Uncertainty flag on 1/alpha2 58- 62 F5.2 mag/arcsec+2 SuBr0 ? Exponential model central surface brightness (1) 63 A1 --- u_SuBr0 Uncertainty flag on SuBr0 65- 69 F5.2 mag/arcsec+2 SuBr0c ? Corrected exponential model central surface brightness 70 A1 --- u_SuBr0c Uncertainty flag on SuBr0c 72- 80 A9 --- Profile Profile type (G1) 81- 91 A11 --- SMB89 Salzer et al. morphological class (G2) 93- 98 A6 --- LTh85 Loose & Thuan morphological class (G2) 100-101 I2 --- TMT97 Telles et al. morphological class (G2)
Note (1): Residuals: 1/alpha = 0.15"; SuBr0 = 0.2 mag/arcsec2
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 12 A12 --- HS HS designation (Hamburg Schmidt Survey) 14- 18 F5.1 Mpc Dist Distance 20- 25 F6.2 mag RMAG Absolute R magnitude 27- 29 F3.1 kpc reL Effective radius 31- 34 F4.1 kpc r24L ? Equivalent radii of the 24Rmag/arcsec2 isophote 36- 38 F3.1 kpc rHII ? Seeing corrected approximate linear size of the star-forming regions, measured in the R band 39 A1 --- u_rHII Uncertainty flag on rHII 41- 43 F3.1 arcsec 1/alpha ? Exponential model scale length (") 44 A1 --- u_1/alpha Uncertainty flag on 1/alpha 46- 48 F3.1 kpc 1/alphaL ? Exponential model scale length (kpc) 49 A1 --- u_1/alphaL Uncertainty flag on 1/alpha2 51- 55 F5.2 mag/arcsec+2 SuBr0 ? Exponential model central surface brightness 56 A1 --- u_SuBr0 Uncertainty flag on SuBr0 58- 62 F5.2 mag/arcsec+2 SuBr0c ? Corrected exponential model central surface brightness 63 A1 --- u_SuBr0c Uncertainty flag on SuBr0c 65- 71 A7 --- Profile Profile type (G1) 73- 82 A10 --- SMB89 Salzer et al. morphological class (G2) 84- 88 A5 --- LTh85 Loose & Thuan morphological class (G2) 90- 91 I2 --- TMT97 Telles et al. morphological class (G2)
Global Notes: Note (G1): Assigned profile type as follows: Type 1 = pure exponential disk (d) Type 2 = composite profile with nucleus or bulge: n/b and disk (d); probably an outer halo (h). Type 3 = central light depression (c) or always convex curvature over linear radius (cnv). Type 4 = quasi-stellar (non-resolved) profile (st). Type 5 = definitely non-exponential profile with concave curvature over linear radius (cnc). Note (G2): Morphological classes. Following the prescriptions of Salzer et al. (1989ApJS...70..479S), hereafter SMB89, we classified our ELGs as: * Seyfert galaxies (Sy) and Starburst Nucleus Galaxies (SBN) have, on average, similar magnitudes (MB≤-20) and sizes (∼20 kpc). They can be disentangled from each other by including spectral line characteristics. The classification of a few Seyfert galaxies in our sample was obtained from the literature. Other ELGs with corresponding luminosities and sizes are classified as SBN (or as Giant Irregulars - GI, in a few cases) * Dwarf Amorphous Nuclear Starburst Galaxies (DANS) are smaller (∼10kpc) and less luminous (MB~-18.5) symmetric disk galaxies with bright (stellar) nuclear region, of amorphous appearance, and show no features in their disk * H II Hotspot galaxies (HIIH) have sizes and luminosities as DANS but are irregular in shape, with strong emission regions everywhere in the galaxy, more often found off-center * Dwarf H II Hotspot galaxies (DHIIH) are as HIIH but smaller in size (∼3.8kpc) and in absolute magnitude (MB~-16.5) * Sargent-Searle (SS) objects are the smallest (≤2kpc) and the least luminous (<MB≥-14) ELGs * Interacting Pairs (IP) consist of two galaxies of comparable size, which show evidence of recent interaction. The classes of DANS, HIIH, DHIIH and SS make up the broad group of Blue Compact Galaxies (BCGs), and most of them are also dwarfs, namely Blue Compact Dwarf Galaxies (BCDs). We assigned the general type of BCD to some less clear cases, where it was not possible to distinguish between different morphological subtypes. A few candidates in our sample were classified as Magellanic Irregulars (MI) and Giant Irregulars (GI). Loose & Thuan, 1985, hereafter LTh85, studied a sample of ∼50 BCDs on deep CCD frames and proposed a classification scheme based on the regularity of the isophotal shapes of both the high-surface-brightness (HSB) star-forming regions and the low-surface-brightness (LSB) outer region. Each BCD is described by two letters, one lower case letter which describes the location and shape of the star-forming regions and one upper case letter which describes the shape of the outer isophotes n = for a single star-forming region located at the nucleus of the galaxy with circular or elliptical isophotes i = for several star-forming regions which are not at the center and possess irregular isophotes) E = for circular or elliptical outer isophotes I = for irregular outer isophotes) LTh85 distinguished four main types of BCDs: * iE, the most common type in their sample; * nE; * iI, with subtypes of cometary (iI,C), and merger (iI,M) evidences; * i0, for pure stellar images without underlying older stellar population. Finally, ∼10 galaxies (out of ∼50) in LTh85 sample, which show some spiral structure, were reclassified as starburst spiral galaxies. For clearly non-dwarf ELGs with some spiral features we use notation S... In their study of structural and morphological properties of H II galaxies, Telles et al., 1997MNRAS.288...78T, hereafter TMT97, proposed a further morphological classification scheme, based on two main criteria: on the multiplicity of H II regions and on the shape of the outer isophotes. Both morphological classification schemes of LTh85 and TMT97 relay on similar structural features, but they are complementary to each other: the scheme of TMT97 specifies the multiplicity of the H II regions; LTh85 classes describe the outer isophotes in more detail. For comparison of different morphological classification schemes we assigned the TMT97-classes to our sample of ELGs too, by means of describing the morphology of each ELG with two integers. The first integer shows the number of resolved H II regions: 1 = single dominant giant H II region; 2 = double H II region; 3 = multiple (≥ 3) H II region. The second integer characterizes outer structure: 1 = disturbed morphologies and irregular outer isophotes, extensions, fans or tails beyond the H II regions; 2 = symmetric and regular objects, regardless of the multiplicity of the star-forming regions (i.e. their internal structure).
History: From A&A electronic version and prepared via OCR at CDS. References: Loose & Thuan, 1985, in: Star-Forming Dwarf Galaxies and Related Objects, Kunth D., Thuan T.X. and Van T.T. (eds.). Paris: Editions Frontieres, p. 73
(End) James Marcout, Patricia Bauer [CDS] 26-May-2000
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