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The richness dependence of galaxy cluster correlations: results from a redshift survey of rich APM clusters

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 291:2 (1997) 305-313

Authors:

RAC Croft, GB Dalton, G Efstathiou, WJ Sutherland, SJ Maddox

The shapes and ages of elliptical galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 285:1 (1997) L1-L4

Authors:

RS deJong, RL Davies

The variable UV central spike of NGC 4552

ASTR SOC P 117 (1997) 545-549

Authors:

M Cappellari, D Burstein, LM Buson, SD Alighieri, L Greggio, A Renzini, J Funes, F Bertola

Abstract:

The nature of the UV-bright spike at the center of the otherwise normal galaxy NGC 4552 is investigated by means of both Hubble Space Telescope (HST) imaging (FOC) and spectroscopy (FOS). This central feature-which underwent a recent dramatic UV flare-provides a potential new tool for revealing the presence of massive black holes in normal galaxies. In particular the sub-arcsec FOS spectra of the nucleus suggest that NGC 4552 does harbor an object with mass M > 4 x 10(8) M. within the central 2 pc.

X-ray QSO evolution from a very deep ROSAT survey

(1996)

Authors:

LR Jones, IM McHardy, MR Merrifield, KO Mason, PJ Smith, RG Abraham, G Branduardi-Raymont, AM Newsam, G Dalton, M Rowan-Robinson, G Luppino

3D: A new tool for probing the stars and ISM in AGN

Vistas in Astronomy 40:1 (1996) 227-231

Authors:

LE Tacconi-Garman, M Cameron, A Krabbe, H Kroker, N Thatte, L Weitzel

Abstract:

3D, the new MPE NIR imaging spectrometer, provides us with a unique opportunity to probe in detail the structure of the stars, ionized gas, and hot molecular gas in the very centers of AGN. The instrument delivers data cubes with 16×160.5″ pixels which are 256 spectral channels deep. Thus, in a single observation we are able to obtain data on the entire K-Band over an 8″×8″ field of view, with a spectral resolution of R = λ/Δλ = 1000. In this paper we detail the working principles behind the instrument, and show first results from observations of the inner regions of the Seyfert 1 galaxy NGC 7469 made at the Calar Alto observatory. Copyright ©1996 Elsevier Science Ltd.