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HD 214787


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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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Observation and Astrometry data

Constellation:Pégase
Right ascension:22h40m28.35s
Declination:+03°07'58.0"
Apparent magnitude:8.614
Distance:120.627 parsecs
Proper motion RA:-23.2
Proper motion Dec:-16.9
B-T magnitude:9.747
V-T magnitude:8.708

Catalogs and designations:
Proper Names
HD 1989HD 214787
TYCHO-2 2000TYC 571-2-1
USNO-A2.0USNO-A2 0900-20197850
HIPHIP 111941

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