Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The gas content of peculiar galaxies: Counterrotators and polar rings
Autore:
Bettoni, D; Galletta, G; Garcia-Burillo, S; Rodriguez-Franco, A;
Indirizzi:
Univ Padua, Dipartimento Astron, I-35122 Padua, Italy Univ Padua Padua Italy I-35122 Dipartimento Astron, I-35122 Padua, Italy Astron Observ Padova, I-35122 Padua, Italy Astron Observ Padova Padua Italy I-35122 rv Padova, I-35122 Padua, Italy Observ Astron Nacl, Alcala De Henares 28800, Spain Observ Astron Nacl Alcala De Henares Spain 28800 De Henares 28800, Spain Univ Complutense Madrid, Secc Departamental Opt, Dept Matemat Aplicada Biomatemat, Madrid 28037, Spain Univ Complutense Madrid Madrid Spain 28037 omatemat, Madrid 28037, Spain Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan Nobeyama Radio Observ Nagano Japan 3841305 isa Ku, Nagano 3841305, Japan
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 374, anno: 2001,
pagine: 421 - 434
SICI:
1432-0746(200108)374:2<421:TGCOPG>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
DUST-LANE ELLIPTICALS; NEUTRAL HYDROGEN SURVEY; H-I-OBSERVATIONS; MOLECULAR GAS; SPIRAL GALAXIES; INTERSTELLAR MATTER; CO OBSERVATIONS; MERGING GALAXIES; LIMITED SAMPLE; COMPACT-GROUPS;
Keywords:
galaxies : ISM; galaxies : interactions; galaxies : evolution; galaxies : peculiar; radio lines : galaxies; submillimeter;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
80
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 gas content of peculiar galaxies: Counterrotators and polar rings", ASTRON ASTR, 374(2), 2001, pp. 421-434

Abstract

This paper studies the global ISM content in a sample of 104 accreting galaxies, including counterrotators and polar rings, which spans the entire Hubble sequence. The molecular, atomic and hot gas content of accretors is compared to a newly compiled sample of normal galaxies. We present results ofa small survey of the J = 1-0 line of (CO)-C-12 with the 15 m SEST telescope on a sample of 11 accretors (10 counterrotators and 1 polar ring). The SEST sample is enlarged with published data from 48 galaxies, for which observational evidence of counterrotation in the gas and/or the stars has been found. Furthermore, the available data on a sample of 46 polar ring galaxies has been compiled. In order to explore the existence of an evolutionary path linking the two families of accretors, the gas content of counterrotators and polar rings is compared. It was found that the normalized content ofcold gas (M-gas/L-B) in polar rings is similar to1 order of magnitude higher than the reference value derived for normal galaxies. The inferred gas masses are sufficient to stabilize polar rings through self-gravity. In contrast, it was found that the cold gas content of counterrotators is close tonormal for all galaxy types. Although counterrotators and polar rings probably share a common origin, the gas masses estimated here confirm that light gas rings accreted by future counterrotators may have evolved faster thanthe self-gravitating structures of polar rings. In this scenario, the transformation of atomic into molecular gas could be enhanced near the transition region between the prograde and the retrograde disks, especially in late-type accretors characterized by a high content of primordial gas. This is tentatively confirmed in this work: the measured H-2/HI ratio seems larger in counterrotators than in normal or polar ring galaxies for types later than S0s.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 10:33:16