Credit: X-Ray: J. Grindlay
(CfA) et al.,
CXO,
NASA
Optical: W. Keel (U. Alabama Tuscaloosa) et al., 1.5-m Telescope, CTIO
Explanation:
A deep optical image (left)
of 47 Tucanae shows an ancient
globular star cluster so dense and crowded that individual stars
can not be distinguished in its closely packed core.
An
x-ray image of its central regions (inset right) from the
Chandra
Observatory reveals a wealth of x-ray stars hidden there.
Color-coded by energy, low energies are red, medium green,
and high energy cosmic
x-ray sources are blue, while
whitish sources are bright across the x-ray energy bands.
The x-ray stars here are double stars or "compact"
binary star systems.
They are so called because one of the pair of stellar companions is
a normal star and the other a compact object --
a white dwarf,
neutron star,
or possibly a black hole.
Chandra's
x-ray vision detects the presence of
an unexpectedly large number of these exotic star systems
within 47 Tucanae, but it also indicates the apparent
absence of a large central black hole.
The finding suggests that compact binary star systems of
47 Tucanae
may be ejected from the cluster before coalescing
to form a large black hole at its core.
Optical: W. Keel (U. Alabama Tuscaloosa) et al., 1.5-m Telescope, CTIO
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Публикации с ключевыми словами:
нейтронные звезды - globular cluster - двойные звезды - рентгеновское излучение - Пульсар - pulsar - neutron star - binary star - Шаровое скопление
Публикации со словами: нейтронные звезды - globular cluster - двойные звезды - рентгеновское излучение - Пульсар - pulsar - neutron star - binary star - Шаровое скопление | |
См. также:
Все публикации на ту же тему >> | |
