Globular clusters in the stellar stream surrounding the Milky Way analogue NGC 5907-Reference-Cited by-同舟云学术

Globular clusters in the stellar stream surrounding the Milky Way analogue NGC 5907

Published:2019-12-04 Issue:4 Volume:491 Page:5693-5701
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Alabi Adebusola B¹^ORCID,Forbes Duncan A²,Romanowsky Aaron J¹³^ORCID,Brodie Jean P¹

Affiliation:

1. Department of Astronomy & Astrophysics, University of California Observatories, 1156 High Street, Santa Cruz, CA 95064,USA

2. Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia

3. Department of Physics and Astronomy, San José State University, San Jose, CA 95192, USA

Abstract

ABSTRACT We study the globular clusters (GCs) in the spiral galaxy NGC 5907 well-known for its spectacular stellar stream – to better understand its origin. Using wide-field Subaru/Suprime-Cam gri images and deep Keck/DEIMOS multi-object spectroscopy, we identify and obtain the kinematics of several GCs superimposed on the stellar stream and the galaxy disc. We estimate the total number of GCs in NGC 5907 to be 154 ± 44, with a specific frequency of 0.73 ± 0.21. Our analysis also reveals a significant, new population of young star cluster candidates found mostly along the outskirts of the stellar disc. Using the properties of the stream GCs, we estimate that the disrupted galaxy has a stellar mass similar to the Sagittarius dwarf galaxy accreted by the Milky Way, i.e. $\sim 10^8~\rm M_\odot$.

Funder

Division of Arctic Sciences

National Science Foundation

Research Corporation for Science Advancement

National Astronomical Observatory of Japan

California Institute of Technology

National Aeronautics and Space Administration

W. M. Keck Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics