Bibcode
DOI
Arnaboldi, Magda; Aguerri, J. Alfonso L.; Napolitano, Nicola R.; Gerhard, Ortwin; Freeman, Kenneth C.; Feldmeier, John; Capaccioli, Massimo; Kudritzki, Rolf P.; Méndez, Roberto H.
Bibliographical reference
The Astronomical Journal, Volume 123, Issue 2, pp. 760-771.
Advertised on:
2
2002
Citations
117
Refereed citations
84
Description
We have imaged an empty area of 34×34 arcmin2 1.5d
north of the Virgo Cluster core to survey for intracluster planetary
nebula (PN) candidates. We have implemented and tested a fully automatic
procedure for the selection of emission-line objects in wide-field
images, based on the on-off technique from Ciardullo and Jacoby. Freeman
et al. have spectroscopically confirmed a sample of intracluster
planetary nebulae in one Virgo field. We use the photometric and
morphological properties of this sample to test our selection procedure.
In our newly surveyed Virgo field, 75 objects were identified as best
candidates for intracluster PNe. The luminosity function of the
spectroscopically confirmed PNe shows a brighter cutoff than the
planetary nebula luminosity function for the inner regions of M87. Such
a brighter cutoff is also observed in the newly surveyed field and
indicates a smaller distance modulus, implying that the front end of the
Virgo Cluster is closer to us by a significant amount: 14% closer (2.1
Mpc) than M87 for the spectroscopic field, using the PN luminosity
function distance of 14.9 Mpc to M87, and 18% closer (2.8 Mpc) than M87
for the newly surveyed field. Independent distance indicators
(Tully-Fisher relation for Virgo spirals and surface brightness
fluctuations for Virgo ellipticals) agree with these findings. From
these two Virgo Cluster fields there is no evidence that the surface
luminosity density for the diffuse stellar component in the cluster
decreases with radius. The luminosity surface density of the diffuse
stellar population is comparable to that of the galaxies. This paper is
based on observations carried out at the ESO telescopes at La Silla and
at the Anglo Australian Observatory.