the inner 2 ′ ′ stars reveal an infrared excess of S2, the closest star to the black hole, that c... more the inner 2 ′ ′ stars reveal an infrared excess of S2, the closest star to the black hole, that could sign the first thermal infrared detection of Sgr A*. A multi-wavelength maximum likelihood analysis has allowed us to eliminate all but two of the candidates for gravitational lensing proposed by Alexander (2001). Our observations of the thin and intersecting structures of the Northern Arm could trace several shocks heating the neighbooring dust rather than a stream of matter in orbit around the central mass as previously thought.
We present the new ESO Archive services which improve the electronic data access via the Download... more We present the new ESO Archive services which improve the electronic data access via the Download Manager and also provide PIs with the option to delegate data access to their collaborators via the Data Access Control.
At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of as... more At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of astronomical observations is the optical turbulence, especially the seeing, coherence time and ground layer fraction. These are critical variables driving the performance of the instruments of the Very Large Telescope (VLT), especially those fed with adaptive optics systems. Currently, the night astronomer does not have a predictive tool to support him/her in decision-making at night. As most service-mode observations at the VLT last less than two hours, it is critical to be able to predict what will happen in this time frame, to avoid time losses due to sudden changes in the turbulence conditions, and also to enable more aggressive scheduling. We therefore investigate here the possibility to forecast the turbulence conditions over the next two hours. We call this "turbulence nowcasting", analogously with weather nowcasting, a term already used in meteorology coming from the cont...
At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of as... more At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of astronomical observations is the optical turbulence, especially the seeing, coherence time and ground layer fraction. These are critical variables driving the performance of the instruments of the Very Large Telescope (VLT), especially those fed with adaptive optics systems. Currently, the night astronomer does not have a predictive tool to support him/her in decision-making at night. As most service-mode observations at the VLT last less than two hours, it is critical to be able to predict what will happen in this time frame, to avoid time losses due to sudden changes in the turbulence conditions, and also to enable more aggressive scheduling. We therefore investigate here the possibility to forecast the turbulence conditions over the next two hours. We call this "turbulence nowcasting", analogously with weather nowcasting, a term already used in meteorology coming from the cont...
... of star formation. For this reason, we have expanded our studies of spiral, irregular, and dw... more ... of star formation. For this reason, we have expanded our studies of spiral, irregular, and dwarf galaxies (eg, Young et a!. 1986; Thronson and Bally 1987b; Tacconi and Young 1987; Kenney 1987; Young et al. 1989; Thronson ...
We present our near-IR integrated spectral library of six globular clusters in the LMC and compar... more We present our near-IR integrated spectral library of six globular clusters in the LMC and compare the data with existing stellar populations models. We find good agreement between models and data in the case of old, metal-poor clusters, while for intermediate-age and more metal-rich clusters we observe a deviation from the models. We find that this disagreement is due to
the inner 2 ′ ′ stars reveal an infrared excess of S2, the closest star to the black hole, that c... more the inner 2 ′ ′ stars reveal an infrared excess of S2, the closest star to the black hole, that could sign the first thermal infrared detection of Sgr A*. A multi-wavelength maximum likelihood analysis has allowed us to eliminate all but two of the candidates for gravitational lensing proposed by Alexander (2001). Our observations of the thin and intersecting structures of the Northern Arm could trace several shocks heating the neighbooring dust rather than a stream of matter in orbit around the central mass as previously thought.
We present the new ESO Archive services which improve the electronic data access via the Download... more We present the new ESO Archive services which improve the electronic data access via the Download Manager and also provide PIs with the option to delegate data access to their collaborators via the Data Access Control.
At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of as... more At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of astronomical observations is the optical turbulence, especially the seeing, coherence time and ground layer fraction. These are critical variables driving the performance of the instruments of the Very Large Telescope (VLT), especially those fed with adaptive optics systems. Currently, the night astronomer does not have a predictive tool to support him/her in decision-making at night. As most service-mode observations at the VLT last less than two hours, it is critical to be able to predict what will happen in this time frame, to avoid time losses due to sudden changes in the turbulence conditions, and also to enable more aggressive scheduling. We therefore investigate here the possibility to forecast the turbulence conditions over the next two hours. We call this "turbulence nowcasting", analogously with weather nowcasting, a term already used in meteorology coming from the cont...
At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of as... more At Paranal Observatory, the least predictable parameter affecting the short-term scheduling of astronomical observations is the optical turbulence, especially the seeing, coherence time and ground layer fraction. These are critical variables driving the performance of the instruments of the Very Large Telescope (VLT), especially those fed with adaptive optics systems. Currently, the night astronomer does not have a predictive tool to support him/her in decision-making at night. As most service-mode observations at the VLT last less than two hours, it is critical to be able to predict what will happen in this time frame, to avoid time losses due to sudden changes in the turbulence conditions, and also to enable more aggressive scheduling. We therefore investigate here the possibility to forecast the turbulence conditions over the next two hours. We call this "turbulence nowcasting", analogously with weather nowcasting, a term already used in meteorology coming from the cont...
... of star formation. For this reason, we have expanded our studies of spiral, irregular, and dw... more ... of star formation. For this reason, we have expanded our studies of spiral, irregular, and dwarf galaxies (eg, Young et a!. 1986; Thronson and Bally 1987b; Tacconi and Young 1987; Kenney 1987; Young et al. 1989; Thronson ...
We present our near-IR integrated spectral library of six globular clusters in the LMC and compar... more We present our near-IR integrated spectral library of six globular clusters in the LMC and compare the data with existing stellar populations models. We find good agreement between models and data in the case of old, metal-poor clusters, while for intermediate-age and more metal-rich clusters we observe a deviation from the models. We find that this disagreement is due to
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Papers by L. Tacconi-garman