Spectrophotometric and morphological investigation of galaxies with a uv excess that comprise physical systems

The results of a spectroscopic and morphological investigation of galaxies with a UV excess, Nos. 205,206, 208, and 209 from the list of [M. A. Kazarian, Astrofizìka,15, 5 (1979);15, 193 (1979)], are presented. The equivalent widths, relative intensities, and half-widths of lines were determined. The mass of galaxy No. 205 was also determined. Translated from Astrofizika, Vol. 40, No. 2, pp. 179–185, April–June, 1997.     

Some statistical properties of spiral galaxies along the Hubble sequence

A statistical study has been made for the variations along the Hubble sequence, os such parameters as the degree of tightness of winding of spiral arm λ, the pitch angle μ, the flatness of the disk H/D₂₅ and the thickness H along the Hubble sequence for 365 spiral galaxies published in A&Ap Supplement Series. The mean values of these quantities for the various Hubble types have been obtained for the first time. The results of the statistics show clearly 1) that the Hubble classification of spiral galaxies is one which has only a qualitative and statistical significance, and 2) that the dispersion relation in the density wave theory is valid for most spiral galaxies, i.e., the arms of most spiral galaxies satisfy the requirements of being tightly wound.     

A statistical study of galaxies with UV excess in the Kiso catalog

We show that the number of galaxies with ultraviolet excess in the Kiso catalog decreases rapidly as the inclincation of the galaxy to the line of sight increases. This effect is observed in spiral galaxies of both type Sk and type Sp. Moreover spiral galaxies that are steeply inclined to the line of sight are on the average weaker than galaxies viewed face-on. Due to internal absorption the distribution of UV-excess galaxies over the intensity classes L, M, and H is also distorted.Translated fromAstrofizika, Vol. 37, No. 4, 1994.The authors are grateful to E. G. Nikogosyan for assistance with the computations.     

Faint galaxies in groups of bright galaxies

Byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 33, No. 3, pp. 403–408, November–December, 1990.     

Two galaxies with UV excess

Published in Astrofizika, Vol. 38, No. 4, pp. 690–691, October–December, 1995.     

Spectrophotometric investigation of eight galaxies with a UV excess

The results of a spectroscopic and morphological investigation of galaxies with a UV excess Nos. 27, 28, 93, 101, 109, 164, 204, and 217 from the lists of [M. A. Kazarian, 15, 5, 193 (1979)] are given. The equivalent widths, relative intensities, and half- widths of lines are determined. The masses of galaxies Nos. 28, 93, 101, 164, 204, and 217 are also determined. Translated from Astrofizika, Vol. 41, No. 2, pp. 175–184. April-June, 1998.     

Morphological classification of new galaxies with a UV excess

The results of a morphological classification of 580 galaxies with a UV excess, included in the lists in [M. A. Kazarian, Astrofizika,15, 5 (1979); ibid.,15, 193 (1979); M. A. Kazarian and É. S. Kazarian, ibid.,16, 17 (1980); ibid.,18, 512 (1982); ibid.,19, 213 (1983)], are presented. For this we have developed a set of symbols, using the types E, S, and Ir introduced by Hubble, as well as symbols introduced by other authors and us. This set enabled us to make the morphological classification. Direct photographs obtained on the 2.6-m and 6-m telescopes were used to classify 141 of the galaxies (over 24%), while Palomar Atlas charts were used for the remaining 439 galaxies. These galaxies were divided into two groups based on classification conditions, and data on each group are given in Tables 1 and 2, respectively. The results for each group, given in Table 3, show that with the transition from early types, such as C and E, to later types, such as S and Ir, the relative number of galaxies going into one group (Table 1), in which the classification was based on direct photographs, increases in comparison with the number going into the other group (Table 2).Translated from Astrofizika, Vol. 39, No. 3, pp. 431–439, July–September, 1996.     

Spectroscopic investigation of three galaxies with a UV excess

Erevan State University. Translated from Astrofizika, Vol. 36, No. 3, pp. 363–374, July–September, 1993.     

The relation of dwarf galaxies with bright barred galaxies in virgo cluster

On the basis of extensive observational material it is statistically demonstrated that dwarf galaxies appear more often around barred galaxies than around normal spiral galaxies. Moreover, the more barred spiral galaxies there are in a given region, the more dwarf galaxies are found there as well.Translated from Astrofizika, Vol. 38, No. 1, pp. 45–53, January–March, 1995.     

Spectral observations of galaxies with UV excess

Spectral observations of 19 galaxies with UV-excesses from Kazarian’s list are reported. The spectra were obtained with the 2.6-m telescope at the Byurakan Observatory using the SCORPIO spectral camera. A grism was used to obtain spectra in the wavelength interval λλ7420-3920 Å. 43 spectra in which emission lines are mainly observed were obtained from the 19 galaxies, except for the spectra of Kaz 21, Kaz 178, Kaz 183, and Kaz 184. The spectra of Kaz 17, Kaz 151, Kaz 153, and Kaz 357 have type Sy2 galactic features. In the spectra of the galaxies Kaz 17, Kaz 151, and Kaz 153, absorption lines are observed along with high excitation emission lines such as HeI λ5876 Å and HeII λ4686 Å. No lines were observed within the interval λλ7420-3920 Å in the spectra of the galaxies Kaz 183 and Kaz 184. __________ Translated from Astrofizika, Vol. 49, No. 3, pp. 351–358 (August 2006).