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Transient sources original
dcterms created equal to or less than 2017-03-20T21:12:29.000Zequal to or more than 2017-03-20T21:12:29.000Z
dcterms modified equal to or less than 2019-11-25T18:33:08.387Zequal to or more than 2019-11-25T18:33:08.387Z
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High energy astrophysics original
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X-ray transient sources original
Gamma-ray transient sources original
Ultraviolet transient sources original
Radio transient sources original
X-ray transient sources original
dcterms created equal to or less than 2017-03-20T21:13:51.000Zequal to or more than 2017-03-20T21:13:51.000Z
dcterms modified equal to or less than 2020-11-04T21:03:21.663Zequal to or more than 2020-11-04T21:03:21.663Z
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Transient sources original
X-ray sources original
definition An X-ray source that enhances its emission well above its usual level for a period typically longer than a week. Recurrences can be periodic or aperiodic, but there is no obvious correlation between recurrence time and the luminosity amplitude of the outburst. X-ray transients seem to be divided into two classes: those associated with high-mass X-ray binary (HMXB) stars and those associated with low-mass X-ray binary (LMXB) stars. The HMXBs contain a neutron star or black hole paired with a massive star. Often, the stellar companion is a Be star, Be star, which sometimes sheds material from its equatorial region. In these systems, the transient event is characterized by having more higher energy X-rays in the spectrum. The LMXBs contain a neutron star or black hole orbiting around a cooler, low-mass star. These transient events often generate more lower-energy X-rays.
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X-ray bursters original
Gamma-ray transient sources original
dcterms created equal to or less than 2017-03-20T21:14:14.000Zequal to or more than 2017-03-20T21:14:14.000Z
dcterms modified equal to or less than 2020-12-17T16:32:27.013Zequal to or more than 2020-12-17T16:32:27.013Z
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Transient sources original
Gamma-ray sources original
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Gamma-ray bursters original
Ultraviolet transient sources original
dcterms created equal to or less than 2017-03-20T21:14:27.000Zequal to or more than 2017-03-20T21:14:27.000Z
dcterms modified equal to or less than 2019-11-26T19:48:13.168Zequal to or more than 2019-11-26T19:48:13.168Z
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Transient sources original
Ultraviolet sources original
Compact dwarf galaxies original
dcterms created equal to or less than 2016-11-01T14:35:49.000Zequal to or more than 2016-11-01T14:35:49.000Z
dcterms modified equal to or less than 2016-11-01T14:36:10.000Zequal to or more than 2016-11-01T14:36:10.000Z
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Dwarf galaxies original
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Blue compact dwarf galaxies original
Ultracompact dwarf galaxies original
Amorphous irregular galaxies original
dcterms created equal to or less than 2016-11-01T17:43:30.000Zequal to or more than 2016-11-01T17:43:30.000Z
dcterms modified equal to or less than 2018-05-10T15:01:07.000Zequal to or more than 2018-05-10T15:01:07.000Z
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Irregular galaxies original
Exoplanet systems original
dcterms created equal to or less than 2016-11-01T14:33:14.000Zequal to or more than 2016-11-01T14:33:14.000Z
dcterms modified equal to or less than 2020-12-09T19:41:38.101Zequal to or more than 2020-12-09T19:41:38.101Z
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Exoplanet astronomy original
definition A planetary system consisting of exoplanets orbiting a star other than Sun.
High latitude field original
dcterms created equal to or less than 2016-11-02T13:41:57.000Zequal to or more than 2016-11-02T13:41:57.000Z
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Field of view original
Low surface brightness galaxies original
dcterms created equal to or less than 2016-11-01T17:58:24.000Zequal to or more than 2016-11-01T17:58:24.000Z
dcterms modified equal to or less than 2020-11-09T21:21:55.076Zequal to or more than 2020-11-09T21:21:55.076Z
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Galaxies original
definition A member of a particularly faint population of galaxies with a central surface brightness below the brightness of the background sky. The central regions of many of them resemble a dwarf galaxy, but most of the mass is contained in a large gaseous disk of low density that is observable only with long-exposure optical images or at radio wavelengths. Some are as massive as a large spiral galaxy, for example Malin 1. The proportion of LSBGs relative to normal galaxies is unknown. They may however represent a significant fraction of mass in the Universe. LSBGs are thought to be primitive systems because they have total masses similar to normal galaxies, but have typically converted less than 10% of their gas into stars. Spiral LSBGs do not obey Freeman's law.
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L galaxies original
Astronomy software original
dcterms created equal to or less than 2018-01-26T16:15:56.000Zequal to or more than 2018-01-26T16:15:56.000Z
dcterms modified equal to or less than 2020-10-26T18:56:16.952Zequal to or more than 2020-10-26T18:56:16.952Z
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Computational astronomy original
definition A general term used to describe a collection of computer programs, procedures, and documentation that perform some astronomy related tasks on a computer system.
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Astronomical simulations original
Astronomy web services original
Educational software original
Software documentation original
Software licensing original