Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey
Abstract
We report the discovery of a new ultra-faint stellar system found near the Magellanic Clouds in the DECam Local Volume Exploration Survey. This new system, DELVE J0155-6815 (DELVE 2), is located at a heliocentric distance of D⊙ = 71 ± 4 kpc, which places it at a 3D physical separation of 12 ± 3 kpc from the center of the Small Magellanic Cloud and $${28}_{-3}^{+4}\,\mathrm{kpc}$$ from the center of the Large Magellanic Cloud (LMC). DELVE 2 is identified as a resolved overdensity of old (τ > 13.3 Gyr) and metal-poor ($$[\mathrm{Fe}/{\rm{H}}]=-{2.0}_{-0.5}^{+0.2}$$ dex) stars with a projected half-light radius of $${r}_{1/2}={21}_{-3}^{+4}\,\mathrm{pc}$$ and an absolute magnitude of $${M}_{V}=-{2.1}_{-0.5}^{+0.4}\,\mathrm{mag}$$. The size and luminosity of DELVE 2 are consistent with both the population of recently discovered ultra-faint globular clusters and the smallest ultra-faint dwarf galaxies. However, its photometrically derived age and metallicity would place it among the oldest and most metal-poor globular clusters in the Magellanic system. In the absence of spectroscopic measurements of the system's metallicity dispersion and internal kinematics, we are unable to conclusively classify this system at this time. DELVE 2 is detected in Gaia DR2 with a clear proper-motion signal, with multiple blue horizontal-branch stars near the centroid of the system with proper motions consistent with the systemic mean. We measure the system proper motion to be $$({\mu }_{\alpha }\cos \delta ,{\mu }_{\delta })$$ = $$({1.02}_{-0.25}^{+0.24},-{0.85}_{-0.19}^{+0.18})$$ mas yr-1. We compare the spatial position and proper motion of DELVE 2 with simulations of the accreted satellite population of the LMC and find that it is very likely to be associated with the LMC.
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- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- DECam Local Volume Exploration Survey (DELVE) Collaboration
- OSTI Identifier:
- 1712773
- Report Number(s):
- FERMILAB-PUB-20-485-AE-LDRD; FERMILAB-PUB-20-485-AE; arXiv:2009.08550
Journal ID: ISSN 0004-637X; oai:inspirehep.net:1818106
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 910; Journal Issue: 1; Journal ID: ISSN 0004-637X
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Cerny, W., Pace, A. B., Drlica-Wagner, A., Ferguson, P. S., Mau, S., Adamów, M., Carlin, J. L., Choi, Y., Erkal, D., Johnson, L. C., Li, T. S., Martínez-Vázquez, C. E., Mutlu-Pakdil, B., Nidever, D. L., Olsen, K. G., Pieres, A., Tollerud, E. J., Simon, J. D., Vivas, A. K., James, D. J., Kuropatkin, N., Majewski, S., Martínez-Delgado, D., Massana, P., Miller, A. E., Neilsen, E. H., Noël, N. D., Riley, A. H., Sand, D. J., Santana-Silva, L., Stringfellow, G. S., and Tucker, D. L. Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey. United States: N. p., 2021.
Web. doi:10.3847/1538-4357/abe1af.
Cerny, W., Pace, A. B., Drlica-Wagner, A., Ferguson, P. S., Mau, S., Adamów, M., Carlin, J. L., Choi, Y., Erkal, D., Johnson, L. C., Li, T. S., Martínez-Vázquez, C. E., Mutlu-Pakdil, B., Nidever, D. L., Olsen, K. G., Pieres, A., Tollerud, E. J., Simon, J. D., Vivas, A. K., James, D. J., Kuropatkin, N., Majewski, S., Martínez-Delgado, D., Massana, P., Miller, A. E., Neilsen, E. H., Noël, N. D., Riley, A. H., Sand, D. J., Santana-Silva, L., Stringfellow, G. S., & Tucker, D. L. Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey. United States. https://doi.org/10.3847/1538-4357/abe1af
Cerny, W., Pace, A. B., Drlica-Wagner, A., Ferguson, P. S., Mau, S., Adamów, M., Carlin, J. L., Choi, Y., Erkal, D., Johnson, L. C., Li, T. S., Martínez-Vázquez, C. E., Mutlu-Pakdil, B., Nidever, D. L., Olsen, K. G., Pieres, A., Tollerud, E. J., Simon, J. D., Vivas, A. K., James, D. J., Kuropatkin, N., Majewski, S., Martínez-Delgado, D., Massana, P., Miller, A. E., Neilsen, E. H., Noël, N. D., Riley, A. H., Sand, D. J., Santana-Silva, L., Stringfellow, G. S., and Tucker, D. L. Tue .
"Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey". United States. https://doi.org/10.3847/1538-4357/abe1af. https://www.osti.gov/servlets/purl/1712773.
@article{osti_1712773,
title = {Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey},
author = {Cerny, W. and Pace, A. B. and Drlica-Wagner, A. and Ferguson, P. S. and Mau, S. and Adamów, M. and Carlin, J. L. and Choi, Y. and Erkal, D. and Johnson, L. C. and Li, T. S. and Martínez-Vázquez, C. E. and Mutlu-Pakdil, B. and Nidever, D. L. and Olsen, K. G. and Pieres, A. and Tollerud, E. J. and Simon, J. D. and Vivas, A. K. and James, D. J. and Kuropatkin, N. and Majewski, S. and Martínez-Delgado, D. and Massana, P. and Miller, A. E. and Neilsen, E. H. and Noël, N. D. and Riley, A. H. and Sand, D. J. and Santana-Silva, L. and Stringfellow, G. S. and Tucker, D. L.},
abstractNote = {We report the discovery of a new ultra-faint stellar system found near the Magellanic Clouds in the DECam Local Volume Exploration Survey. This new system, DELVE J0155-6815 (DELVE 2), is located at a heliocentric distance of D⊙ = 71 ± 4 kpc, which places it at a 3D physical separation of 12 ± 3 kpc from the center of the Small Magellanic Cloud and ${28}_{-3}^{+4}\,\mathrm{kpc}$ from the center of the Large Magellanic Cloud (LMC). DELVE 2 is identified as a resolved overdensity of old (τ > 13.3 Gyr) and metal-poor ($[\mathrm{Fe}/{\rm{H}}]=-{2.0}_{-0.5}^{+0.2}$ dex) stars with a projected half-light radius of ${r}_{1/2}={21}_{-3}^{+4}\,\mathrm{pc}$ and an absolute magnitude of ${M}_{V}=-{2.1}_{-0.5}^{+0.4}\,\mathrm{mag}$. The size and luminosity of DELVE 2 are consistent with both the population of recently discovered ultra-faint globular clusters and the smallest ultra-faint dwarf galaxies. However, its photometrically derived age and metallicity would place it among the oldest and most metal-poor globular clusters in the Magellanic system. In the absence of spectroscopic measurements of the system's metallicity dispersion and internal kinematics, we are unable to conclusively classify this system at this time. DELVE 2 is detected in Gaia DR2 with a clear proper-motion signal, with multiple blue horizontal-branch stars near the centroid of the system with proper motions consistent with the systemic mean. We measure the system proper motion to be $({\mu }_{\alpha }\cos \delta ,{\mu }_{\delta })$ = $({1.02}_{-0.25}^{+0.24},-{0.85}_{-0.19}^{+0.18})$ mas yr-1. We compare the spatial position and proper motion of DELVE 2 with simulations of the accreted satellite population of the LMC and find that it is very likely to be associated with the LMC.},
doi = {10.3847/1538-4357/abe1af},
journal = {The Astrophysical Journal},
number = 1,
volume = 910,
place = {United States},
year = {Tue Mar 23 00:00:00 EDT 2021},
month = {Tue Mar 23 00:00:00 EDT 2021}
}
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