Skip to main content Accessibility help
×
Home
Hostname: page-component-cf9d5c678-h2mp8 Total loading time: 0.18 Render date: 2021-07-27T23:20:40.598Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Using ground based data as a precursor for Gaia in getting proper motions of satellites

Published online by Cambridge University Press:  07 March 2018

Tobias K. Fritz
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, 530 McCormick Road, VA 22904-4325, USA email: tkf4w@virginia.edu
Sean T. Linden
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, 530 McCormick Road, VA 22904-4325, USA email: tkf4w@virginia.edu
Paul Zivick
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, 530 McCormick Road, VA 22904-4325, USA email: tkf4w@virginia.edu
Nitya Kallivayalil
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, 530 McCormick Road, VA 22904-4325, USA email: tkf4w@virginia.edu
Jo Bovy
Affiliation:
Department of Astronomy & Astrophysics at University of Toronto, 50 St. George Street M5S 3H4 Toronto, Ontario, Canada
Corresponding
E-mail address:
Rights & Permissions[Opens in a new window]

Abstract

We present our effort to measure the proper motions of satellites in the halo of the Milky Way with mainly ground based telescopes as a precursor on what is possible with Gaia. For our first study, we used wide field optical data from the LBT combined with a first epoch of SDSS observations, on the globular cluster Palomar 5 (Pal 5). Since Pal 5 is associated with a tidal stream it is very useful to constrain the shape of the potential of the Milky Way. The motion and other properties of the Pal 5 system constrain the inner halo of the Milky Way to be rather spherical. Further, we combined adaptive optics and HST to get an absolute proper motion of the globular cluster Pyxis. Using the proper motion and the line-of-sight velocity we find that the orbit of Pyxis is rather eccentric with its apocenter at more than 100 kpc and its pericenter at about 30 kpc. The dynamics excludes an association with the ATLAS stream, the Magellanic clouds, and all satellites of the Milky Way at least down to the mass of Leo II. However, the properties of Pyxis, like metallicity and age, point to an origin from a dwarf of at least the mass of Leo II. We therefore propose that Pyxis originated from an unknown relatively massive dwarf galaxy, which is likely today fully disrupted. Assuming that Pyxis is bound to the Milky Way we derive a 68% lower limit on the mass of the Milky Way of 9.5 × 1011 M.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

Bland-Hawthorn, J. & Gerhard, O., 2016, ARAA, 54, 529 CrossRefGoogle Scholar
Bovy, J. & Rix, H.-W., 2013, ApJ, 779, 115 CrossRefGoogle Scholar
Bovy, J., 2015, ApJS, 216, 29 CrossRefGoogle Scholar
Bovy, J., Bahmanyar, A., Fritz, T. K., & Kallivayalil, N., 2016, ApJ, 833, 31 CrossRefGoogle Scholar
Boylan-Kolchin, M., Bullock, J. S., & Kaplinghat, M., 2011, MNRAS, 415, L40 CrossRefGoogle Scholar
Boylan-Kolchin, M., Bullock, J. S., Sohn, S. T., Besla, G., & van der Marel, R. P., 2013, ApJ, 768, 140 CrossRefGoogle Scholar
Da Costa, G. S., 1995, PASP, 107, 937 CrossRefGoogle Scholar
Debattista, V. P., Roškar, R., Valluri, M., et al., 2013, MNRAS, 434, 2971 CrossRefGoogle Scholar
Fritz, T. K. & Kallivayalil, N., 2015, ApJ, 811, 123 CrossRefGoogle Scholar
Fritz, T. K., Linden, S. T., Zivick, P., et al., 2017, ApJ, 840, 30 CrossRefGoogle Scholar
Gibbons, S. L. J., Belokurov, V., & Evans, N. W., 2014, MNRAS, 445, 3788 CrossRefGoogle Scholar
Irwin, M. J., Demers, S., & Kunkel, W. E., 1995, ApJ (Letters), 7453, L21 CrossRefGoogle Scholar
Kallivayalil, N., van der Marel, R. P., Besla, G., Anderson, J., & Alcock, C., 2013, ApJ, 764, 161 CrossRefGoogle Scholar
Kallivayalil, N., Wetzel, A. R., Simon, J. D., et al. 2015, arXiv, 1503.01785Google Scholar
Kazantzidis, S., Abadi, M. G., & Navarro, J. F., 2010, ApJ (Letters), 720, L62 CrossRefGoogle Scholar
Klypin, A., Kravtsov, A. V., Valenzuela, O., & Prada, F., 1999, ApJ, 522, 82 CrossRefGoogle Scholar
Koposov, S. E., Rix, H.-W., & Hogg, D. W., 2010, ApJ, 712, 260 CrossRefGoogle Scholar
Koposov, S. E., Irwin, M., Belokurov, V., et al., 2014, MNRAS (Letters), 442, 85 CrossRefGoogle Scholar
Law, D. R. & Majewski, S. R., 2010, ApJ, 714, 229 CrossRefGoogle Scholar
Odenkirchen, M., Grebel, E. K., Rockosi, C. M., et al., 2001, ApJ (Letters), 548, L165 CrossRefGoogle Scholar
Palma, C., Kunkel, W. E., & Majewski, S. R., 2000, PASP, 112, 1305 CrossRefGoogle Scholar
Pearson, S., Küpper, A. H. W., Johnston, K. V., & Price-Whelan, A. M., 2015, ApJ, 799, 28 CrossRefGoogle Scholar
Sales, L. V., Navarro, J. F., Kallivayalil, N., & Frenk, C. S., 2017, MNRAS, 465, 1879 CrossRefGoogle Scholar
Wang, J., Frenk, C. S., Navarro, J. F., Gao, L., & Sawala, T., 2012, MNRAS, 424, 2715 CrossRefGoogle Scholar
Zavala, J., Jing, Y. P., Faltenbacher, A., et al., 2009, ApJ, 700, 1779 CrossRefGoogle Scholar
Zinn, R., 1993, APC, 48, 38 Google Scholar
You have Access

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Using ground based data as a precursor for Gaia in getting proper motions of satellites
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Using ground based data as a precursor for Gaia in getting proper motions of satellites
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Using ground based data as a precursor for Gaia in getting proper motions of satellites
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *