Skip to main content Accessibility help
×
Home
Hostname: page-component-568f69f84b-xr9nb Total loading time: 1.184 Render date: 2021-09-21T03:38:18.460Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Peering through the dust: Precise astrometry in the Galactic mid-plane with the VVV survey

Published online by Cambridge University Press:  17 July 2015

L.C. Smith*
Affiliation:
University of Hertfordshire, UK
P.W. Lucas
Affiliation:
University of Hertfordshire, UK
R.L Smart
Affiliation:
OATO INAF, Italy
H.R.A. Jones
Affiliation:
University of Hertfordshire, UK
R. Kurtev
Affiliation:
Universidad de Valparaiso, Chile
J.C. Beamin
Affiliation:
PUC, Santiago, Chile ESO Vitacura, Chile
J. Borissova
Affiliation:
Universidad de Valparaiso, Chile
M. Gromadzki
Affiliation:
Universidad de Valparaiso, Chile
V. Ivanov
Affiliation:
ESO Vitacura, Chile
D. Minniti
Affiliation:
Universidad Andres Bello, Chile
D.J. Pinfield
Affiliation:
University of Hertfordshire, UK
*Corresponding
Get access

Abstract

Gaia will see little of the Galactic mid-plane and nuclear bulge due to high extinction at optical wavelengths. To study the structure and kinematics of the inner Galaxy we must look to longer wavelengths. The Vista Variables in the Via Lactea (VVV, Minniti et al. 2010) survey currently provides just over 4 years of observations covering approximately 560 square degrees of the Galactic bulge and plane. Typically each source is observed 50–150 times in the Ks band over this period. Using these data we provide relative proper motions for approximately 200 million unique sources down to Ks∼16 with uncertainties approaching 1 mas yr−1. In addition, we fit a solution of the parallactic motion of all sources with significant proper motion and discover a number of new nearby brown dwarfs. These results will allow us to identify faint common proper motion companions to stars with Gaia parallaxes, increasing the number of brown dwarf benchmark objects. Our absolute astrometric calibration precision is currently ∼ 2 mas yr−1, based on PPMXL. The Gaia absolute astrometric reference grid will allow us to precisely anchor our results and measure the streaming motions of stars in the bulge. Finally, we anticipate that the catalogue could provide kinematic distances to the numerous optically invisible high amplitude variable stars that VVV is discovering.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2015

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Minniti, D., Lucas, P.W., Emerson, J.P., et al., 2010, New Astron., 15, 433CrossRef

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.

Peering through the dust: Precise astrometry in the Galactic mid-plane with the VVV survey
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.

Peering through the dust: Precise astrometry in the Galactic mid-plane with the VVV survey
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.

Peering through the dust: Precise astrometry in the Galactic mid-plane with the VVV survey
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? *