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Titolo:
The visible environment of galaxies with counterrotation
Autore:
Bettoni, D; Galletta, G; Prada, F;
Indirizzi:
Univ Padua, Dipartimento Astron, I-35122 Padua, Italy Univ Padua Padua Italy I-35122 Dipartimento Astron, I-35122 Padua, Italy Osservatorio Astron Padova, I-35122 Padua, Italy Osservatorio Astron Padova Padua Italy I-35122 ova, I-35122 Padua, Italy Ctr Astron Hispano Aleman, Almeria 04080, Spain Ctr Astron Hispano AlemanAlmeria Spain 04080 eman, Almeria 04080, Spain
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 374, anno: 2001,
pagine: 83 - 91
SICI:
1432-0746(200107)374:1<83:TVEOGW>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLAR-RING GALAXIES; SEYFERT-GALAXIES; GALACTIC DISKS; STELLAR DISKS; GAS; COMPANIONS; MERGERS; STARS; KINEMATICS; NGC-4550;
Keywords:
galaxies : evolution; galaxies : formation; galaxies : interactions; galaxies : peculiar;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Galletta, G Univ Padua, Dipartimento Astron, Vicolo Osservatorio 2, I-35122 Padua, Italy Univ Padua Vicolo Osservatorio 2 Padua Italy I-35122 a, Italy
Citazione:
D. Bettoni et al., "The visible environment of galaxies with counterrotation", ASTRON ASTR, 374(1), 2001, pp. 83-91

Abstract

In this paper we present a statistical study of the environments of 49 galaxies in which there is gas- or stellar-counterrotation. The number of possible companions in the field (to apparent magnitude 22), their size and concentration were considered. All the statistical parameters were analysed bymeans of Kolgomorov-Smirnov tests, using a control sample of 43 galaxies without counterrotation. From our data, no significant differences between the counter-rotating and control samples appear. This is different to Seyfert or radio-loud galaxies which lie in environments with a higher density ofcompanions. On the contrary, if a weak tendency exists, for galaxies with gas counterrotation only, it is discovered in regions of space where the large scale density of galaxies is smaller. Our results tend to disprove the hypothesis that counterrotation and polar rings derive from a recent interaction with a small satellite or a galaxy of similar size. To a first approximation, they seem to follow the idea that all galaxies are born through a merger process of smaller objects occurring very early in their life, or that they derive from a continuous, non-traumatic infall of gas that formed stars later. Whatever the special machinery is which produces counterrotation or polar rings instead of a co-planar, co-rotating distribution of gas and stars, it seems not to be connected to the present galaxy density of their environments.

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Documento generato il 03/12/20 alle ore 21:27:57