Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-26T05:23:10.435Z Has data issue: false hasContentIssue false
  • English
  • Français

Star clusters and young populations in the dwarf irregular galaxy Leo A

Published online by Cambridge University Press:  30 October 2019

Rima Stonkutė ,
Marius Čeponis ,
Alina Leščinskaitė  and
Vladas Vansevičius
Rima Stonkutė
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania email: rima.stonkute@ftmc.lt Astronomical Observatory of Vilnius University, M. K. Čiurlionis st. 29, 03100 Vilnius, Lithuania email: vladas.vansevicius@ff.vu.lt
Marius Čeponis
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania email: rima.stonkute@ftmc.lt
Alina Leščinskaitė
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania email: rima.stonkute@ftmc.lt
Vladas Vansevičius
Affiliation:
Center for Physical Sciences and Technology, Saulėtekis av. 3, 10257 Vilnius, Lithuania email: rima.stonkute@ftmc.lt Astronomical Observatory of Vilnius University, M. K. Čiurlionis st. 29, 03100 Vilnius, Lithuania email: vladas.vansevicius@ff.vu.lt
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have studied young stellar populations and star clusters in the dwarf irregular galaxy Leo A using multicolor (B, V, R, I, Hα) photometry data obtained with the Subaru Suprime-Cam and two-color photometry results measured on archival HST/ACS F475W & F814W frames. The analysis of the main sequence (MS) and blue supergiant (BSG – “blue loop”) stars enabled us to study the star formation history in the Leo A galaxy during the last ~200 Myr. Also, we have discovered 5 low-mass (≲ 400 M⊙) star clusters within the ACS field. This finding, taking into account a low metallicity environment and a yet-undetected molecular gas in Leo A, constrains star formation efficiency estimates and scenarios. Inside the well known “hole” in the H i column density map (Hunter et al. 2012) we found a shock front (prominent in Hα), implying an unseen progenitor and reminding the “hole” problems widely discussed by Warren et al. (2011).

Keywords

galaxies: dwarfgalaxies: individual Leo Agalaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 139 - 142
Copyright
© International Astronomical Union 2019 

References

Bernard, E. J., Monelli, M., Gallart, C., et al . 2013, MNRAS, 432, 3047 CrossRefGoogle Scholar
Brown, W. R., Geller, M. J., Kenyon, S. J., & Kurtz, M. J. 2007, ApJ, 666, 231 CrossRefGoogle Scholar
Cole, A. A., Skillman, E. D., Tolstoy, E., et al . 2007, ApJ, 659, L17 CrossRefGoogle Scholar
Dolphin, A. E., Saha, A., Claver, J., et al . 2002, AJ, 123, 3154 CrossRefGoogle Scholar
Hunter, D. A., Ficut-Vicas, D., Ashley, T., et al . 2012, AJ, 144, 134 CrossRefGoogle Scholar
Kirby, E. N., Rizzi, L., Held, E. V., et al . 2017, ApJ, 834, 9 CrossRefGoogle Scholar
Marigo, P., Girardi, L., Bressan, A., et al . 2017, ApJ, 835, 77 CrossRefGoogle Scholar
Schlafly, E. F., & Finkbeiner, D. P. 2011, ApJ, 737, 103 CrossRefGoogle Scholar
Schulte-Ladbeck, R. E., Hopp, U., Drozdovsky, I. O., et al . 2002, AJ, 124, 896 CrossRefGoogle Scholar
Stonkutė, R., Arimoto, N., Hasegawa, T., et al . 2014, ApJSS, 214, 19 CrossRefGoogle Scholar
Stonkutė, R., Čeponis, M., Leščinskaitė, A. et al . 2018, AA, 614, 144 CrossRefGoogle Scholar
Tolstoy, E., Gallagher, J. S., Cole, A. A., et al. 1998, AJ, 116, 1244 CrossRefGoogle Scholar
van Zee, L., Skillman, E. D., & Haynes, M. P. 2006, ApJ, 637, 269 CrossRefGoogle Scholar
Vansevičius, V., Arimoto, N., Hasegawa, T., et al . 2004, ApJ, 611, L93 CrossRefGoogle Scholar
Warren, S. R., Weisz, D. R., Skillman, E. D., et al . 2011, ApJ, 738, 10 CrossRefGoogle Scholar
Young, L. M., & Lo, K. Y. 1996, ApJ, 462, 203 CrossRefGoogle Scholar