ar X iv : a st ro - p h / 98 03 06 2 v 1 6 M ar 1 99 8 Intracluster Planetary Nebulae in the Virgo Cluster I . Initial Results
نویسنده
چکیده
We report the initial results of a survey for intracluster planetary nebulae in the Virgo Cluster. In two 16 × 16 fields, we identify 69 and 16 intracluster planetary nebula candidates, respectively. In a third 16 × 16 field near the central elliptical galaxy M87, we detect 75 planetary nebula candidates, of which a substantial fraction are intracluster in nature. By examining the number of the planetaries detected in each field and the shape of the planetary nebula luminosity function, we show that 1) the intracluster starlight of Virgo is distributed non-uniformly, and varies between subclumps A and B, 2) the Virgo Cluster core extends ∼ 3 Mpc in front of M87, and thus is elongated along the line-of-sight, and 3) a minimum of 22% of Virgo’s stellar luminosity resides between the galaxies in our fields, and that the true number may be considerably larger. We also use our planetary nebula data to argue that the intracluster stars in Virgo are likely derived from a population that is of moderate age and metallicity. Subject headings: planetary nebulae: general — galaxies: intergalactic medium — galaxies: interactions — clusters: individual: Virgo
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متن کاملar X iv : a st ro - p h / 98 12 03 1 v 1 2 D ec 1 99 8 An RXTE study of M 87 and the core of the Virgo cluster
We present hard X-ray observations of the nearby radio galaxy M87 and the core of the Virgo cluster using the Rossi X-ray Timing Explorer. These are the first hard X-ray observations of M87 not affected by contamination from the nearby Seyfert 2 galaxy NGC 4388. Thermal emission from Virgo’s intracluster medium is clearly detected and has a spectrum that is well described by a kT ≈ 2.7 keV ther...
متن کاملar X iv : a st ro - p h / 98 12 03 1 v 2 1 1 Ja n 19 99 An RXTE study of M 87 and the core of the Virgo cluster
We present hard X-ray observations of the nearby radio galaxy M87 and the core of the Virgo cluster using the Rossi X-ray Timing Explorer. These are the first hard X-ray observations of M87 not affected by contamination from the nearby Seyfert 2 galaxy NGC 4388. Thermal emission from Virgo’s intracluster medium is clearly detected and has a spectrum that is well described by a kT ≈ 2.7 keV ther...
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