Galaxy formation and evolution

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NGC 4672: A candidate for bulge-to-disk decoupling in spirals

ASTR SOC P 197 (2000) 139-140

Authors:

M Sarzi, EM Corsini, M Cappellari, A Pizzella, JCV Beltran, JG Funes, F Bertola
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NGC 4672:: A new case of an early-type disk galaxy with an orthogonally decoupled core

ASTRONOMY & ASTROPHYSICS 360:2 (2000) 439-446

Authors:

M Sarzi, EM Corsini, A Pizzella, JCV Beltrán, M Cappellari, JG Funes, F Bertola
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NIR Spectroscopy with the VLT of a Sample of ISO Selected Hubble Deep Field South Galaxies

Chapter in ISO Surveys of a Dusty Universe, Springer Nature 548 (2000) 240-247

Authors:

Dimitra Rigopoulou, Alberto Franceschini, Reinhard Genzel, Paul van der Werf, Hervé Aussel, Catherine Cesarsky, Michel Dennefeld, Seb Oliver, Michael Rowan-Robinson
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Near-IR integral field spectroscopy with adaptive optics

ASTR SOC P 195 (2000) 206-215

Authors:

N Thatte, S Anders, F Eisenhauer, M Tecza, S Mengel, A Eckart, R Genzel, G Monnet, D Bonaccini

Abstract:

Integral field spectroscopy, in conjunction with adaptive optics systems, has the unique potential of providing spectra at spatial resolutions close to the diffraction limit of the telescope. We present first results from integral field spectroscopy in conjunction with an adaptive optics system, achieving diffraction limited images and spectra at the Calar Alto 3.5 meter telescope. SINFONI, an adaptive optics assisted integral field spectrometer currently being built for the VLT, is one of the few adaptive optics optimized integral field instruments. We present a brief summary of its features, together with a brief description of the image slicer employed in SINFONI.
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Near-infrared properties of four young star clusters in NGC 4038/39

ASTR SOC P 211 (2000) 96-100

Authors:

S Mengel, MD Lehnert, N Thatte, R Genzel

Abstract:

integral field spectroscopy in the K-band (1.9-2.4 mu m) was performed on four IR-bright star clusters in NGC4038/39 ("The Antennae"). Two of them (hereafter F1 and F2) are located in the overlap region of the two galaxies, and together comprise approximate to 25% of the total 15 mu m and approximate to 10% of the total non-thermal 4.8 GHz emission from this pair of merging galaxies. The other two clusters, each of them spatially resolved into two components, are located in the northern galaxy, one on the eastern (F3) and one on the western (F4) "loop" of blue clusters. Comparing our analysis of Br gamma, CO-bandheads, H alpha (from archival HST data), and V-K colours with stellar population synthesis models indicates that the clusters are extincted (A(v) approximate to 0.7 - 4.3 mags) and young, displaying a significant age spread (4 - 10x10(6) yrs). Using our derived age estimates and assuming the parameters of the IMF, we find that these clusters have masses that range from a few x10(5) to a few x10(6) M-circle dot.
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