TY - JOUR

T1 - The structure and evolution of M 51-type galaxies

AU - Reshetnikov, VP

AU - Klimanov, SA

PY - 2003/7

Y1 - 2003/7

N2 - We discuss the integrated kinematic parameters of 20 M 51-type binary galaxies. A comparison of the orbital masses of the galaxies with the sum of the individual masses suggests that moderately massive dark halos surround bright spiral galaxies. The relative velocities of the galaxies in binary systems were found to decrease with increasing relative luminosity of the satellite. We obtained evidence that the Tully-Fisher relation for binary members could be flatter than that for local field galaxies. An enhanced star formation rate in the binary members may be responsible for this effect. In most binary systems, the direction of the orbital motion of the satellite coincides with the direction of the rotation of the main galaxy. Seven candidates for distant M 51-type objects were found in the Northern and Southern Hubble Deep Fields. A comparison of this number with the statistics of nearby galaxies provides evidence for the rapid evolution of the space density of M 51-type galaxies with redshift z. We assume that M 51-type binary systems could be formed through the capture of a satellite by a massive spiral galaxy. It is also possible that the main galaxy and its satellite in some of the systems have a common cosmological origin. (C) 2003 MAIK "Nauka/Interperiodica".

AB - We discuss the integrated kinematic parameters of 20 M 51-type binary galaxies. A comparison of the orbital masses of the galaxies with the sum of the individual masses suggests that moderately massive dark halos surround bright spiral galaxies. The relative velocities of the galaxies in binary systems were found to decrease with increasing relative luminosity of the satellite. We obtained evidence that the Tully-Fisher relation for binary members could be flatter than that for local field galaxies. An enhanced star formation rate in the binary members may be responsible for this effect. In most binary systems, the direction of the orbital motion of the satellite coincides with the direction of the rotation of the main galaxy. Seven candidates for distant M 51-type objects were found in the Northern and Southern Hubble Deep Fields. A comparison of this number with the statistics of nearby galaxies provides evidence for the rapid evolution of the space density of M 51-type galaxies with redshift z. We assume that M 51-type binary systems could be formed through the capture of a satellite by a massive spiral galaxy. It is also possible that the main galaxy and its satellite in some of the systems have a common cosmological origin. (C) 2003 MAIK "Nauka/Interperiodica".

KW - galaxies

KW - groups and clusters of galaxies

KW - intergalactic gas

KW - DARK-MATTER HALOES

KW - TULLY-FISHER RELATION

KW - HUBBLE DEEP FIELD

KW - LUMINOSITY FUNCTION

KW - REDSHIFT SURVEY

KW - SATELLITE GALAXIES

KW - SPIRAL GALAXIES

KW - PHOTOIONIZATION

KW - Z-SIMILAR-TO-1

KW - MODEL

U2 - 10.1134/1.1589860

DO - 10.1134/1.1589860

M3 - статья

VL - 29

SP - 429

EP - 436

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 7

ER -