Skip to main content Accessibility help
×
Home
Hostname: page-component-5cfd469876-rgz9k Total loading time: 0.435 Render date: 2021-06-25T02:28:20.113Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true }

Disentangling the Stellar Populations of Fornax Dwarf Spheroidal

Published online by Cambridge University Press:  11 July 2011

M. Cesetti
Affiliation:
Department of Astronomy, University of Padova, Italy Osservatorio Astronomico di Padova – INAF, Padova, Italy
E.V. Held
Affiliation:
Osservatorio Astronomico di Padova – INAF, Padova, Italy
M. Gullieuszik
Affiliation:
Royal Observatory of Belgium, Brussels, Belgium
L. Rizzi
Affiliation:
Joint Astronomy Centre, Hilo, Hawaii, USA
G. Battaglia
Affiliation:
European Southern Observatory, Garching, Germany
A. Cole
Affiliation:
School of Mathematics and Physics, University of Tasmania, Hobart, Australia
G. Da Costa
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Australia
M. Mateo
Affiliation:
Department of Astronomy, University of Michigan, Ann Arbor, MI, USA
E. Olszewski
Affiliation:
Steward Observatory, University of Arizona, Tucson, USA
E. Tolstoy
Affiliation:
Kapteyn Astronomical Institute, Groningen, The Netherlands
M. Walker
Affiliation:
Institute of Astronomy, University of Cambridge, UK
Corresponding
E-mail address:
Get access

Abstract

We studied the stellar populations of Fornax dwarf spheroidal galaxy using HST/WFPC2 imaging of 7 galaxy fields. Our observations reach the oldest main-sequence turn-off, revealing distinct stars formation episodes and allowing us to address the evolution of this prototype dwarf spheroidal galaxy known to have experienced an extended history of star formation. From our HST data, spatial gradients in the stellar content of Fornax emerge with greater clarity. The outermost fields show only stars with ages between 7–12Gyr, while the intermediate region hosts a stellar population between 4–10Gyr, and stars younger of 2 Gyr are found in the innermost fields. A clearly visible gap in the subgiant branch points to bimodality in the main star formation episode. Our observations also indicate that the inner clump detected by Coleman et al. (2004) is characterized by the presence of young stars with age about 1.8 Gyr.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2011

Access options

Get access to the full version of this content by using one of the access options below.

References

Battaglia, G., et al., 2006, A&A, 459, 423
Coleman, M., et al., 2004, AJ, 127, 832CrossRef
Dolphin, A.E., 2009, PASP, 121, 655CrossRef
Olszewski, E.W., Mateo, M., Harris, J., Walker, M.G., Coleman, M.G. & Da Costa, G.S., 2006, AJ, 131, 912CrossRef

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.

Disentangling the Stellar Populations of Fornax Dwarf Spheroidal
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.

Disentangling the Stellar Populations of Fornax Dwarf Spheroidal
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.

Disentangling the Stellar Populations of Fornax Dwarf Spheroidal
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? *