Seminars and Colloquia at ESO Garching
For ESO and ESO-related Conferences and Workshops in Europe and Chile please check the main Conferences and Workshops page.
March 2013
"Possible detection of a large population of white dwarfs in the direction of the Galactic bulge"
Annalisa Calamida (STScI)
Abstract
Close
"Possible detection of a large population of white dwarfs in the direction of the Galactic bulge"
Annalisa Calamida (STScI)
Abstract We performed time-series observations of 12 ACS/WFC3 fields in the Sagittarius low-reddening window in the Galactic bulge, by sampling the region every two weeks for seven consecutive months. The aim of the project is to detect isolated black holes and neutron stars through astrometric microlensing.
I will present in this talk preliminary results based on the reduction of four ACS fields. The composite V,I-band photometric catalog includes about 1 milion stars down to V = 30 mag and a large population of candidate white dwarfs. Proper motions have been measured for the SWEEPS ACS field, a deep observation of which was taken in 2004. The time baseline of eight years allowed us to achieve a proper motion accuracy of better than 0.15 mas/yr at V = 26 mag in both coordinates. The analysis of the proper motions shows that most of the white dwarfs have higher velocities compared to the bulk of bulge stars.
Annalisa Calamida (STScI)
Abstract We performed time-series observations of 12 ACS/WFC3 fields in the Sagittarius low-reddening window in the Galactic bulge, by sampling the region every two weeks for seven consecutive months. The aim of the project is to detect isolated black holes and neutron stars through astrometric microlensing.
I will present in this talk preliminary results based on the reduction of four ACS fields. The composite V,I-band photometric catalog includes about 1 milion stars down to V = 30 mag and a large population of candidate white dwarfs. Proper motions have been measured for the SWEEPS ACS field, a deep observation of which was taken in 2004. The time baseline of eight years allowed us to achieve a proper motion accuracy of better than 0.15 mas/yr at V = 26 mag in both coordinates. The analysis of the proper motions shows that most of the white dwarfs have higher velocities compared to the bulk of bulge stars.
