Galaxy formation and evolution

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Central UV Spikes in Two Galactic Spheroids

Chapter in The Formation of Galactic Bulges, Cambridge University Press (CUP) (2000) 191-194

Authors:

M Cappellari, F Bertola, D Burstein, LM Buson, L Greggio, A Renzini
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Central UV spikes in two galactic spheroids

Formation of Galactic Bulges Cambridge University Press (2000) 191-194

Authors:

Michele Cappellari, F Bertola, D Burstein, LM Buson, L Greggio, A Renzini

Abstract:

FOS spectra and FOC photometry of two centrally located, UV-bright spikes in the elliptical galaxy NGC 4552 and the bulge-dominated early spiral NGC 2681, are presented. These spectra reveal that such point-like UV sources detected by means of HST within a relatively large fraction ~15% of bulges can be related to radically different phenomena. While the UV unresolved emission in NGC 4552 represents a transient event likely induced by an accretion event onto a supermassive black hole, the spike seen at the center of NGC 2681 is not variable and it is stellar in nature.
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The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698 and NGC 4672

Chapter in The Formation of Galactic Bulges, Cambridge University Press (CUP) (2000) 165-169

Authors:

F Bertola, EM Corsini, M Cappellari, JC Vega Beltrán, A Pizzella, M Sarzi, JG Funes
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Near infrared imaging spectroscopy of NGC1275

ArXiv astro-ph/0001052 (2000)

Authors:

Alfred Krabbe, Bruce J Sams III, Reinhard Genzel, Niranjan Thatte, Francisco Prada

Abstract:

We present H and K band imaging spectroscopy of the core regions of the cD/AGN galaxy NGC1275. The spectra, including lines from H2, H, 12CO bandheads, [FeII], and [FeIII], are exploited to constrain the star formation and excitation mechanisms in the galaxy's nucleus. The near-infrared properties can largely be accounted for by ionized gas in the NLR, dense molecular gas, and hot dust concentrated near the active nucleus of NGC1275. The strong and compact H2 emission is mostly from circumnuclear gas excited by the AGN and not from the cooling flow. The extended emission of latetype stars is diluted in the center by the thermal emission of hot dust.
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ALFA & 3D: Integral field spectroscopy with adaptive optics

Proceedings of SPIE - The International Society for Optical Engineering 4007 (2000)

Authors:

RI Davies, M Kasper, N Thatte, M Tecza, LE Tacconi-Garman, S Anders, T Herbst

Abstract:

One of the most important techniques for astrophysics with adaptive optics is the ability to do spectroscopy at diffraction limited scales. The extreme difficulty of positioning a faint target accurately on a very narrow slit can be avoided by using an integral field unit, which provides the added benefit of full spatial coverage. During 1998, working with ALFA and the 3D integral field spectrometer, we demonstrated the validity of this technique by extracting and distinguishing spectra from binary stars separated by only 0.26 inch. The combination of ALFA & 3D is also ideally suited to imaging distant galaxies or the nuclei of nearby ones, as its field of view can be changed between 1.2 inches×1.2 inches and 4 inches×4 inches, depending on the pixel scale chosen. In this contribution we present new results both on galactic targets, namely young stellar objects, as well as extra-galactic objects including a Seyfert and a starburst nucleus.