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HD 214787


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관련 글

The gravitationally lensed quasar Q2237+0305 in X-rays: ROSAT/HRI detection of the ``Einstein Cross"
We report the first detection of the gravitationally lensed quasarQ2237+0305 in X-rays. With a ROSAT/HRI exposure of 53 ksec taken inNov./Dec. 1997, we found a count rate of 0.006 counts per second for thecombined four images. This corresponds to an X-ray flux of 2.2*E(-13)erg/cm(2) /sec and an X-ray luminosity of 4.2*E(45) erg/sec (in theROSAT energy window 0.1-2.4 keV). The ROSAT/HRI detector is not able toresolve spatially the four quasar images (maximum separation 1.8arcsec). The analysis is based on about 330 source photons. The signalis consistent with no variability, but with low significance. Thisdetection is promising in view of the upcoming X-ray missions withhigher spatial/spectral resolution and/or collecting power (ChandraX-ray Observatory, XMM and ASTRO-E).

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관측 및 측정 데이터

별자리:페가수스자리
적경:22h40m28.35s
적위:+03°07'58.0"
가시등급:8.614
거리:120.627 파섹
적경상의 고유운동:-23.2
적위상의 고유운동:-16.9
B-T magnitude:9.747
V-T magnitude:8.708

천체목록:
일반명   (Edit)
HD 1989HD 214787
TYCHO-2 2000TYC 571-2-1
USNO-A2.0USNO-A2 0900-20197850
HIPHIP 111941

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