Star clusters in tidal debris

Author:

Rodruck Michael12,Charlton Jane1,Borthakur Sanchayeeta3,Chitre Aparna4,Durrell Patrick R5,Elmegreen Debra6,English Jayanne7,Gallagher Sarah C8,Gronwall Caryl19,Knierman Karen3,Konstantopoulos Iraklis10,Li Yuexing1,Maji Moupiya11,Mullan Brendan12,Trancho Gelys13,Vacca William14

Affiliation:

1. Department of Astronomy and Astrophysics, The Pennsylvania State University , University Park, PA 16802 , USA

2. Department of Physics, Engineering, and Astrophysics , Randolph-Macon College, Ashland, VA 23005 , USA

3. School of Earth and Space Exploration, Arizona State University , 550 E. Tyler Mall, Room PSF-686 (PO Box 871404), Tempe, AZ 85287 , USA

4. Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218 , USA

5. Department of Physics, Astronomy, Geology and Environmental Sciences, Youngstown State University , Youngstown, OH 44555 , USA

6. Department of Physics and Astronomy , Vassar College, Poughkeepsie, NY 12604 , USA

7. Department of Physics and Astronomy, University of Manitoba , Winnipeg, MB R3T 2N2 , Canada

8. Department of Physics and Astronomy and Institute for Earth and Space Exploration, University of Western Ontario , London, ON N6A 3K7 , Canada

9. Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802 , USA

10. Independent Scholar , Wellington , New Zealand

11. Inter-University Centre for Astronomy and Astrophysics (IUCAA) , Post Bag 4, Ganeshkhind, Pune 411 007 , India

12. Department of Natural Sciences and Engineering Technology , Point Park University 201 Wood St, Pittsburgh, PA 15222 , USA

13. Thirty Meter Telescope International Observatory , 100 W Walnut St, #300, Pasadena, CA 91124 , USA

14. SOFIA-USRA, NASA Ames Research Center , MS N232-12, Moffett Field, CA 94035 , USA

Abstract

ABSTRACT We present results of a Hubble Space Telescope (HST) UBVI-band study of star clusters in tidal tails, using new WFC3 and ACS imaging to complement existing WFPC2 data. We survey 12 tidal tails across seven merging systems, deriving ages and masses for 425 star cluster candidates (SCCs). The stacked mass distribution across all systems follows a power law of the form dN/dM ∝ Mβ, with β = −2.02 ± 0.15, consistent with what is seen in other star-forming environments. GALEX and Swift UV imaging provide star formation rates (SFRs) for our tidal tails, which when compared with ages and masses of our SCCs, allows for a determination of the cluster formation efficiency (CFE). We find the CFE increases with increasing SFR surface density, matching the theoretical model. We confirm this fit down at SFR densities lower than previously measured (log ΣSFR (M⊙ yr−1 kpc−2) ≈ −4.2), as related to the CFE. We determine the half-light radii for a refined sample of 57 SCCs with our HST WFC3 and ACS imaging, and calculate their dynamical age, finding the majority of them to be gravitationally bound. We also provide evidence of only low-mass (<104 M⊙) cluster formation in our nearest galaxy, NGC 1487, consistent with the theory that this system is a dwarf merger.

Funder

Space Telescope Science Institute

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. A co-rotating gas and satellite structure around the interacting galaxy pair NGC 4490/85;Monthly Notices of the Royal Astronomical Society;2024-01-17

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