Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters

We assess the effects of galaxy-galaxy interactions on star formation (SF) by analysing pairs in groups and clusters of galaxies with virial masses in the range 1013-1015 M⊙ extracted from the 2dF Galaxy Redshift Survey (2dFGRS). We find that galaxy pairs with relative separation rp < 15 h-1...

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Detalles Bibliográficos
Publicado: 2004
Materias:
Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: general
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v352_n3_p1081_Alonso
http://hdl.handle.net/20.500.12110/paper_00358711_v352_n3_p1081_Alonso
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v352_n3_p1081_Alonso
record_format dspace
spelling paper:paper_00358711_v352_n3_p1081_Alonso2023-06-08T15:01:19Z Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters Cosmology: theory Galaxies: evolution Galaxies: formation Galaxies: general We assess the effects of galaxy-galaxy interactions on star formation (SF) by analysing pairs in groups and clusters of galaxies with virial masses in the range 1013-1015 M⊙ extracted from the 2dF Galaxy Redshift Survey (2dFGRS). We find that galaxy pairs with relative separation rp < 15 h-1 kpc show significant SF activity in comparison with other group member galaxies. Similar results were found for galaxy pairs in the field (rp < 25 h-1 kpc) so that the nature of SF driven by galaxy interactions is nearly independent of environment, in spite of the general lower level of SF activity in systems of galaxies, The above results reflect, on the one hand, the local nature of SF induced by tidal interactions and, on the other, the role played by the internal properties of galaxies. By using a 2dFGRS mock catalogue we estimate the contamination by spurious pairs, finding that our statistics are dominated by real pairs, in particular for close relative separations, for which our study indicates significant SF activity. We obtain a similar radial and relative velocity distribution of the pairs with respect to the group centre compared with those of other typical group members, so that galaxy pairs have no particular location and dynamics within groups. Except for pairs with small relative separations, which show significant SF activity, we find that pairs in groups are systematically redder and have a lower present-day SF activity than other group members. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v352_n3_p1081_Alonso http://hdl.handle.net/20.500.12110/paper_00358711_v352_n3_p1081_Alonso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: general
spellingShingle Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: general
Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters
topic_facet Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: general
description We assess the effects of galaxy-galaxy interactions on star formation (SF) by analysing pairs in groups and clusters of galaxies with virial masses in the range 1013-1015 M⊙ extracted from the 2dF Galaxy Redshift Survey (2dFGRS). We find that galaxy pairs with relative separation rp < 15 h-1 kpc show significant SF activity in comparison with other group member galaxies. Similar results were found for galaxy pairs in the field (rp < 25 h-1 kpc) so that the nature of SF driven by galaxy interactions is nearly independent of environment, in spite of the general lower level of SF activity in systems of galaxies, The above results reflect, on the one hand, the local nature of SF induced by tidal interactions and, on the other, the role played by the internal properties of galaxies. By using a 2dFGRS mock catalogue we estimate the contamination by spurious pairs, finding that our statistics are dominated by real pairs, in particular for close relative separations, for which our study indicates significant SF activity. We obtain a similar radial and relative velocity distribution of the pairs with respect to the group centre compared with those of other typical group members, so that galaxy pairs have no particular location and dynamics within groups. Except for pairs with small relative separations, which show significant SF activity, we find that pairs in groups are systematically redder and have a lower present-day SF activity than other group members.
title Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters
title_short Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters
title_full Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters
title_fullStr Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters
title_full_unstemmed Galaxy pairs in the 2dF survey - II. Effects of interactions on star formation in groups and clusters
title_sort galaxy pairs in the 2df survey - ii. effects of interactions on star formation in groups and clusters
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v352_n3_p1081_Alonso
http://hdl.handle.net/20.500.12110/paper_00358711_v352_n3_p1081_Alonso
_version_ 1768545638012682240

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