... The stars examined here were primarily culled from two lists of X--ray sources in Orion. ... The second region is two degrees in extent east--west and ten degrees north--south with Orionis being near the northern edge. ... In the end, two main regions were chosen for monitoring: stars near Orionis and stars northwest of the belt of Orion. ... The PSPC identified 22 sources within 15 of Orionis in addition to the sources listed in Table 1 , giving a total of 85 X--ray sources in the Orionis region. ...

... 88, Jan. 1983, p. 1-15. l. A survey of extragalactic radio sources made using driven declination scans is reported covering an area of about 0.07 sr to a limiting flux density of 35 mJy. The fast-scan survey was carried out at a galactic latitude greater than 17 deg with the NRAO 91-m telescope operating at 4.755 GHz, and the 480 sources detected were reobserved at 1.4 GHz with the National Astronomy and Ionosphere Center 305-m telescope at Arecibo. ...

Low dark noise is one of the benefits of MPP, since inverted phase operation suppresses the dominant source of CCD dark noise production (Si-SiO 2 surface states). ... The intrinsic dark rate of WFPC2 CCDs is <0.01 e - pixel -1 s -1 at temperatures below -80њC. Figure 4.5: Average Dark Rates vs. ... The dark current appears to have two components: one from electronic sources in the CCD, and a second component whose strength correlates with the cosmic ray flux. ... Dark count rate (e- s-1 pixel-1) . ...

... Classes . Files . ... Astronomy Observatory 00023 //# 520 Edgemont Road 00024 //# Charlottesville, VA 22903-2475 USA 00025 //# 00026 //# 00027 //# $Id: ComponentType.h 20299 2008-04-03 05:56:44Z gervandiepen $ 00028 00029 #ifndef COMPONENTS _COMPONENTTYPE_H 00030 #define COMPONENTS _COMPONENTTYPE_H 00031 00032 #include casa/aips.h 00033 namespace casac { 00034 class componentlist; 00035 }; 00036 namespace casa { //# NAMESPACE CASA - BEGIN 00037 00038 class String ; 00039 ...

The above process keeps the # of protons and the # of neutrons in the early Universe constant. ... Remember, a free neutron (one that is not bound in an atomic nucleus) will decay into a proton + electron (+ anti-neutrino) in about 900 seconds. AT t=0.01 seconds, none of the neutrons have decayed. ... During this epoch, the proton-to-neutron ratio is 1.0 . Epoch #2: . ... Now we have 62% protons and 38% neutrons where at 0.01 seconds we had 50% protons and 50% neutrons. ...

... region (region-6.2.2) [xmmsas_20030110_1802-5.4.1] . ... The region task will automatically determine the optimal source and background extraction regions for a detected source in an XMM observation. ... The regions are defined in sky coordinates. region will attempt to maximise the area of the extraction region for each source, whilst ensuring that the extraction regions of neighbouring sources do not overlap, and that the background extraction region for a given source excludes neighbouring...