Exoplanets and Stellar Physics

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Infrared to Millimeter Spectroscopy and Imaging of Active Galactic Nuclei

International Astronomical Union Colloquium Cambridge University Press (CUP) 159 (1997) 312-324

Authors:

R Genzel, D Lutz, E Sturm, L Tacconi, N Thatte, A Sternberg
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NIR imaging spectroscopy of IRAS F10214+4724: Evidence for a starburst region around an AGN at z=2.3

REV MEX AST ASTR 6 (1997) 48-51

Authors:

H Kroker, R Genzel, A Krabbe, LE TacconiGarman, M Tecza, N Thatte

Abstract:

We report 1'' K-band imaging spectroscopy of the z=2.284 galaxy IRAS F10214+4724. We find that the rest-frame H alpha and [N II] emission have different spatial extents. Furthermore, we detect broad (Delta upsilon(FWZP)approximate to 3500 km s(-1)) H alpha emission. We conclude that F10214+4724 is a very luminous gravitationally lensed galaxy, which intrinsically contains both a type 1 AGN and a more extended star-forming disk. The AGN and circumnuclear star formation both contribute significantly to the total luminosity of similar to 10(13)L(circle dot).
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Near-Infrared Imaging Spectroscopy of the Seyfert Nucleus of the Circinus Galaxy

International Astronomical Union Colloquium Cambridge University Press (CUP) 159 (1997) 351-352

Authors:

R Maiolino, N Thatte, H Kroker, JF Gallimore, R Genzel
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Precessing warped discs in close binary systems

Chapter in Accretion Disks — New Aspects, Springer Nature 487 (1997) 182-198

Authors:

JCB Papaloizou, JD Larwood, RP Nelson, C Terquem
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The nuclear stellar cluster in NGC 1068

REV MEX AST ASTR 6 (1997) 227-229

Authors:

N Thatte, R Genzel, L Tacconi, A Krabbe, H Kroker

Abstract:

We have imaged a compact stellar cluster, with a characteristic size of 50 pc, toward the nucleus of NGC 1068, using near IR imaging spectroscopy of stellar absorption features in the H and K bands. The near IR stellar light is attributed to a population of late type stars, with an average spectral type of M0. Based on light-to-mass ratio measurements, we derive an upper limit for the age of the nuclear cluster of 4 x 10(9) years. The stellar cluster contributes a non-negligible fraction of the total nuclear bolometric luminosity, a value of 5% being a very conservative lower limit. The compact stellar distribution identifies the dynamical center of the galaxy as being coincident with the peak of the It band emission. The morphology of the excited molecular gas, revealed by mapping the H-2 S(1) line at 2.12 mu m, shows a molecular ring with a radius of similar to 100 pc. Millimeter interferometric imaging in the CO J = 2 --> 1 transition at 1.3 mm shows the ring to be rotating with velocities of similar to 100 km s(-1).
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