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- European Space Research and Technology CentreNL660 papers
- Centre National de la Recherche ScientifiqueFR540 papers
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44 papers · 1 filter
Mining the Blazar Sky
Paolo Padovani, Paolo Giommi
We present the results of our methods to "mine" the blazar sky, i.e., select blazar candidates with very high efficiency. These are based on the cross-correlation between public ra…
The Optical-Near-IR Spectrum of the M87 Jet From HST Observations
Eric S. Perlman, John Biretta, William Sparks +2
We present 1998 HST observations of M87 which yield the first single-epoch optical and radio-optical spectral index images of the jet at resolution. We find $<α_{ro} > \ap…
A Young Stellar Cluster in the Nucleus of NGC 4449
T. Boeker, R. P. van der Marel, L. Mazzuca +4
We have obtained 1-2 A resolution optical Echellette spectra of the nuclear star cluster in the nearby starburst galaxy NGC 4449. The light is clearly dominated by a very young (6-…
Cepheid Calibration of the Peak Brightness of SNe Ia. X. SN 1991T in NGC 4527
A. Saha, A. Sandage, Frank Thim +5
Repeated imaging observations have been made of NGC 4527 with the Hubble Space Telescope between April and June 1999, over an interval of 69 days. Images were obtained on 12 epochs…
The red stellar population in NGC 1569
A. Aloisi, M. Clampin, E. Diolaiti +6
We present HST NICMOS photometry of the resolved stellar population in NGC 1569. The CMD in the F110W and F160W photometric bands contains ~2400 stars with a formal photometric err…
XMM-Newton observation of the Lockman Hole; I. The X-ray Data
G. Hasinger, B. Altieri, M. Arnaud +25
We report on the first deep X-ray survey with the XMM-Newton observatory during the performance verification phase. The field of the Lockman Hole, one of the best studied sky areas…