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El Roque de Los Muchachos Site Characteristics. III. Analysis of Atmospheric Dust and Aerosol Extinction
G. Lombardi, V. Zitelli, S. Ortolani +2
Canary Islands are normally interested by dominant North-East winds that, in some meteorological conditions, can transport sand at high altitude from the Sahara desert. The dust ma…
A galaxy overdensity at z=0.401 associated with an X-ray emitting structure of Warm-Hot Intergalactic Medium
F. Mannucci, G. Bonnoli, L. Zappacosta +2
We present the results of spectroscopic observations of galaxies associated with the diffuse X-ray emitting structure discovered by Zappacosta et al. (2002). After measuring the re…
El Roque de Los Muchachos Site Characteristics. II. Analysis of Wind, Relative Humidity and Air Pressure
G. Lombardi, V. Zitelli, S. Ortolani +1
In this paper we present an analysis of wind speed, wind direction, relative humidity and air pressure taken at TNG, CAMC and NOT at Observatorio del Roque de Los Muchachos, in the…
El Roque de Los Muchachos site characteristics, I.Temperature analysis
G. Lombardi, V. Zitelli, S. Ortolani +1
In this paper we present an analysis of temperature taken at two telescopes located at the Observatorio del Roque de Los Muchachos in the Canary Islands. More than 20 years of meas…
A FIRST-APM-SDSS survey for high-redshift radio QSOs
R. Carballo, J. I. Gonzalez-Serrano, F. M. Montenegro-Montes +4
We selected from VLA-FIRST a sample of 94 objects starlike in SDSSS, and with APM colour O-E>2, i.e. consistent with their being high-z QSOs. 78 candidates were classified spectros…
Metals and dust in high redshift AGNs
R. Maiolino, T. Nagao, A. Marconi +7
We summarize some recent results on the metallicity and dust properties of Active Galactic Nuclei (AGN) at high redshift (1<z<6.4). By using the spectra of more than 5000 QSOs from…