Skip to main content
×
×
Home

A New Globular Cluster in the Area of VVVX

  • E. Bica (a1), D. Minniti (a2) (a3) (a4), C. Bonatto (a1) and M. Hempel (a5)
Abstract

We communicate the discovery of a new globular cluster in the Galaxy that was first detected on WISE/2MASS images and is now confirmed with VVVX photometry. It is a Palomar-like cluster projected at ℓ = 359.15°, b = 5.73°, and may be related to the bulge. We derive an absolute magnitude of MV ≈ −3.3, thus being an underluminous globular cluster. Our analyses provide a reddening of E(BV) = 1.08 ± 0.18 and a distance to the Sun d = 6.3 ± 1 kpc, which implies a current position in the bulge volume. The estimated metallicity is [Fe/H] = −1.5 ± 0.25. It adds to the recently discovered faint globular cluster (Minniti 22) and candidates found with VVV, building up expectations of ≈50 globular clusters yet to be discovered in the bulge. We also communicate the discovery of an old open cluster in the same VVVX tile as the globular cluster. The VVVX photometry provided E(BV) = 0.62 ± 0.1, d = 7.6 ± 1 kpc, and an age of 1.5 ± 0.3 Gyr. With a height from the plane of ≈0.8 kpc, it adds to nine Gyr-class clusters recently discovered within 0.8 ⩽ Z ⩽ 2.2 kpc, as recently probed in the single VVV tile b201. We suggest that these findings may be disclosing the thick disk at the bulge, which so far has no open cluster counterpart, and hardly any individual star. Thus, the VVV and VVVX surveys are opening new windows for follow-up studies, to employ present and future generations of large aperture telescopes.

Copyright
Corresponding author
6Email: charles@if.ufrgs.br
References
Hide All
Abell, G. O. 1955, PASP, 67, 25810.1086/1268151955PASP...67..258A
Barbuy, B., Bica, E., & Ortolani, S. 1998, A&A, 333, 1171998A&A...333..117B
Bica, E., Bonatto, C., & Dutra, C. M. 2003, A&A, 405, 99110.1051/0004-6361:200307002003A&A...405..991B
Bica, E., Ortolani, S., & Barbuy, B. 2016, PASA, 33, e02810.1017/pasa.2015.472016PASA...33...28B
Bonatto, C., & Bica, E. 2007, MNRAS, 377, 130110.1111/j.1365-2966.2007.11691.x2007MNRAS.377.1301B
Bonatto, C., & Bica, E. 2010, MNRAS, 407, 172810.1111/j.1365-2966.2010.17000.x2010MNRAS.407.1728B
Bressan, A., Marigo, P., Girardi, L., Salasnich, B., Dal Cero, C., Rubele, S., & Nanni, A. 2012, MNRAS, 427, 12710.1111/j.1365-2966.2012.21948.x2012MNRAS.427..127B
Brodie, J. P., & Strader, J. 2006, ARA&A, 44, 19310.1146/annurev.astro.44.051905.0924412006ARA&A..44..193B
Caldwell, N., & Romanowsky, A. J. 2016, ApJ, 824, 4210.3847/0004-637X/824/1/422016ApJ...824...42C
Camargo, D., Bica, E., & Bonatto, C. 2016a, MNRAS, 455, 312610.1093/mnras/stv25172016MNRAS.455.3126C
Camargo, D., Bica, E., & Bonatto, C. 2016b, A&A, 593, A9510.1051/0004-6361/2016287102016A&A...593A..95C
Côté, P. 1999, AJ, 118, 40610.1086/3009301999AJ....118..406C
Dias, W. S., Alessi, B. S., Moitinho, A., & Lepine, J. R. D. 2014, VizieR Online Data Catalog, 12014yCat....102022D
Froebrich, D., Scholz, A., & Raftery, C. L. 2007, MNRAS, 374, 39910.1111/j.1365-2966.2006.11148.x2007MNRAS.374..399F
Gaia Collaboration et al. 2016, A&A, 595, A210.1051/0004-6361/2016295122016A&A...595A...2G
Harris, W. E. 2010, preprint (arXiv:1012.3224)2010arXiv1012.3224H
Ivanov, V. D., Piatti, A. E., Beamín, J.-C., Minniti, D., Borissova, J., Kurtev, R., Hempel, M., & Saito, R. K. 2017, A&A, 600, A11210.1051/0004-6361/2016301792017A&A...600A.112I
Kinman, T. D., & Rosino, L. 1962, PASP, 74, 49910.1086/1278641962PASP...74..499K
Koposov, S. E., Belokurov, V., & Torrealba, G. 2017, MNRAS, 470, 270210.1093/mnras/stx11822017MNRAS.470.2702K
Lima, E. F., Bica, E., Bonatto, C., & Saito, R. K. 2014, A&A, 568, A1610.1051/0004-6361/2013230502014A&A...568A..16L
Luque, E., et al. 2017, MNRAS, 468, 9710.1093/mnras/stx4052017MNRAS.468...97L
Minniti, D. 1996, ApJ, 459, 17510.1086/1768791996ApJ...459..175M
Minniti, D., Alonso-García, J., Braga, V., Contreras Ramos, R., Hempel, M., Palma, T., Pullen, J., & Saito, R. K. 2017a, RNAAS, 1, 1610.3847/2515-5172/aa9ab72017RNAAS...1...16M
Minniti, D., et al. 2017b, ApJ, 838, L1410.3847/2041-8213/838/1/L142017ApJ...838L..14M
Minniti, D., et al. 2017c, ApJ, 849, L2410.3847/2041-8213/aa95b82017ApJ...849L..24M
Oliveira, P. R. A., Bica, E., & Bonatto, C. 2018, MNRAS, 476, 84210.1093/mnras/sty2542018MNRAS.476..842O
Ortolani, S., Barbuy, B., Momany, Y., Saviane, I., Bica, E., Jilkova, L., Salerno, G. M., & Jungwiert, B. 2011, ApJ, 737, 3110.1088/0004-637X/737/1/312011ApJ...737...31O
Rossi, L. J., Ortolani, S., Barbuy, B., Bica, E., & Bonfanti, A. 2015, MNRAS, 450, 327010.1093/mnras/stv7482015MNRAS.450.3270R
Saito, R. K., et al. 2012, A&A, 537, A10710.1051/0004-6361/2011184072012A&A...537A.107S
van den Bergh, S. 2010, AJ, 140, 104310.1088/0004-6256/140/4/10432010AJ....140.1043V
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Publications of the Astronomical Society of Australia
  • ISSN: 1323-3580
  • EISSN: 1448-6083
  • URL: /core/journals/publications-of-the-astronomical-society-of-australia
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords