Discovery of new dwarf galaxies around NGC4631 with Subaru/Hyper Suprime-Cam
Abstract
We have observed on-going interacting galaxies (NGC4631 and NGC4656) using Subaru/Hyper Suprime-Cam and reduced the data using HSC pipeline and conducted photometry based on DAOphot. Then, we have detected 8 new dwarf galaxy candidates in the outer region of NGC4631 and confirmed the three candidates previously reported by Karachentsev et al. 2014. The 3 or 4 candidates detected in this study may be a star-forming dwarf irregular galaxy and the other 7 candidates may be an old dwarf spheroidal galaxy based on these stellar populations. It looks like that the effective radius - absolute magnitude relation of dwarf galaxies in NGC4631 group is similar to the relation of the Local Group and the other galaxy systems.
- Publication:
-
The General Assembly of Galaxy Halos: Structure, Origin and Evolution
- Pub Date:
- August 2016
- DOI:
- 10.1017/S1743921315007115
- Bibcode:
- 2016IAUS..317..350T
- Keywords:
-
- galaxies: dwarf;
- galaxies: stellar content;
- galaxies: halo;
- galaxies: individual (NGC 4631;
- NGC 4656)