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The supermassive black hole in NGC4486a detected with SINFONI at the Very Large Telescope
The near-infrared (IR) integral field spectrograph SINFONI at theEuropean Southern Observatory Very Large Telescope opens a new windowfor the study of central supermassive black holes. With a near-IRspatial resolution similar to Hubble Space Telescope optical and theability to penetrate dust, it provides the possibility to explore thelow-mass end of the relation where so far very few black hole masseswere measured with stellar dynamics. With SINFONI, we observed thecentral region of the low-luminosity elliptical galaxy NGC4486a at aspatial resolution of ~0.1arcsec in the K band. The stellar kinematicswere measured with a maximum penalized likelihood method considering theregion around the CO absorption band heads. We determined a black holemass of M• = (1.25+0.75-0.79)× 107Msolar (90 per cent confidence limit)using the Schwarzschild orbit superposition method including the fulltwo-dimensional spatial information. This mass agrees with thepredictions of the relation, strengthening its validity at the lowerσ end.Based on observations at the European Southern Observatory (ESO) VeryLarge Telescope (VLT) (075.B-0236) and on observations made with theAdvanced Camera for Surveys onboard the NASA/ESA Hubble Space Telescope(GO Proposals 9401, obtained from the ESO/ST-ECF Science ArchiveFacility)E-mail: nnowak@mpe.mpg.de
| The eclipsing binary system W CRU
Photoelectric UBV observations of W Cru were obtained between 1984 and1985 using the 50-cm Edith Winstone Blackwell Cassegrain telescope. Thelight curve presents a continuous 'Beta Lyrae'-like variation, alongwith peculier irregularities of the order of 0.1 mag. The possibility offitting both high-mass and low-mass models to the data is considered.
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Observation and Astrometry data
| Constellation: | Σταυρός Νότιος |
| Right ascension: | 12h12m10.90s |
| Declination: | -58°49'06.0" |
| Apparent magnitude: | 8.53 |
| Distance: | 231.481 parsecs |
| Proper motion RA: | -16.2 |
| Proper motion Dec: | 2.7 |
| B-T magnitude: | 8.633 |
| V-T magnitude: | 8.539 |
Catalogs and designations:
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