A dataset provided by the European Space Agency

Name 065250
Title Beyond the Disk and Bulge of M31: Tracing the Transition to the Dark Halo


DOI https://doi.org/10.5270/esa-sdelvgc
Author Dr R. Di Stefano
Description Although they have large mass-to-light ratios, galaxy halos host many stars. The
stars, which are typically old and optically dim, encode information about the
halos and the process of galaxy assembly. Some stars, however, are in bright
X-ray binaries (XRBs). Those XRBs in M31.s halo can be detected over vast
volumes with XMM-Newton. By using data from previous successful XMM-Newton
programs, we need only six 20-ksec exposures to measure the gradient of XRBs
beyond the D25 isophote along both the major and minor galaxy axis. By making
complementary optical observations to identify counterparts, we will trace how
the stellar population diminishes across the transition region connecting
relatively bright areas to the outer halo, with its high ratio of mass to light.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2011-02-01T13:03:31Z/2011-02-03T22:55:57Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2012-03-08T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr R. Di Stefano, 2012, 065250, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-sdelvgc