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Isolated groups of extremely blue dwarf galaxies

Published online by Cambridge University Press:  29 March 2021

Vitor Bootz Open the ORCID record for Vitor Bootz [Opens in a new window] ,
Marina Trevisan ,
Trinh Thuan ,
Yuri Izotov ,
Angela Krabbe  and
Oli Dors Jr. Open the ORCID record for Oli Dors Jr. [Opens in a new window]
Vitor Bootz
Affiliation:
Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil emails: [email protected], [email protected]
Marina Trevisan
Affiliation:
Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil emails: [email protected], [email protected]
Trinh Thuan
Affiliation:
University of Virginia, Charlottesville, VA, United States email: [email protected]
Yuri Izotov
Affiliation:
Bogolyubov Institute for Theoretical Physics, Kyiv, Ukraine email: [email protected]
Angela Krabbe
Affiliation:
Vale do Paraiba University, São José dos Campos, SP, Brazil emails: [email protected], [email protected]
Oli Dors Jr.
Affiliation:
Vale do Paraiba University, São José dos Campos, SP, Brazil emails: [email protected], [email protected]
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Abstract

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Interactions and mergers between dwarf galaxies are mostly gas-rich and should be marked by an intense star formation activity. But these processes, which are expected to be common at earlier times, are very difficult to observe at low redshifts. To investigate that, we look in the Sloan Digital Sky Survey (SDSS) for compact groups that contain one luminous compact galaxy (LCG) with very high specific star formation rate (sSFR) and at least two other blue galaxies. We found 24 groups that satisfy these criteria, among which 12 groups have SDSS spectroscopic data for at least 2 member galaxies. Here we want to investigate, using the tidal strength estimator Q, how interactions between neighbouring galaxies affect the sSFR and concentration of each LCG. Statistical tests reveal a correlation between Q and their sSFR, indicating that tidal forces between neighbouring galaxies might be inducing bursts of star formation in the LCGs.

Keywords

Galaxies: dwarfGalaxies: evolutionGalaxies: interactions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 168 - 169
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

References

Goddard, et al. 2016, MNRAS, 465, 688 Google Scholar
Izotov, et al. 2011, ApJ, 728, 161 CrossRefGoogle Scholar