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Date and Time of the Query: 2019-04-22 T15:55:41 PDT
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For refcode 2005AJ....129..647L:
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Copyright by American Astronomical Society. Reproduced by permission
2005AJ....129..647L Ram Pressure Stripping in the Low-Luminosity Virgo Cluster Elliptical Galaxy NGC 4476 D. M. Lucero, L. M. Young, and J. H. van Gorkom Abstract. We present a deep VLA search for H I emission from the low-luminosity Virgo Cluster elliptical galaxy NGC 4476, which contains 1.1x10^8^ M_sun_ of molecular gas in an undisturbed disk in regular rotation. No H I was detected. The rms noise in the final image corresponds to a 3 {sigma} column density sensitivity of 1.2x10^20^ cm^-2^ at the position of NGC 4476, averaged over the 4 kpc beam. The total H I mass is less than 1.5x10^7^ M_sun_. If we compare our H I upper limit with the H_2_ content, we find that NGC 4476 is extremely deficient in H I compared with other galaxies detected in these two species. The H_2_/HI mass ratio for NGC 4476 is greater than 7, whereas typical H_2_/HI ratios for elliptical galaxies detected in both H I and H_2_ are less than 2. On the basis of this extreme H I deficiency and the intracluster medium density at the projected distance from M87, we argue that either NGC 4476 has undergone ram pressure stripping while traveling through the Virgo Cluster core or its average molecular gas density is larger and its interstellar UV field is smaller than in typical spiral galaxies. NGC 4476 is located 12' in projection from M87, which causes extreme continuum confusion problems. We also discuss in detail the techniques used for continuum subtraction. The spectral dynamic range of our final image is 50,000 to 1. Keywords: Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Elliptical and Lenticular, cD, Galaxies: Evolution, Galaxies: Individual: NGC 4476, Galaxies: ISM, Galaxies: Intergalactic Medium
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