Deficiency of Broad Line AGNs in Compact Groups of Galaxies (2008)
Martinez, M. A., Del Olmo, A., Coziol, R., Focardi, P.
Based on a new survey of AGN activity in Compact Groups of Galaxies, we report a remarkable deficiency of Broad Line AGNs as compared to Narrow Line AGNs. The cause of such deficiency could be...
Nuclear Activity in UZC Compact Groups of Galaxies (2006)
Martinez, M. A., Del Olmo, A., Focardi, P., Perea, J.
We analyse the level of nuclear activity in galaxies belonging to UZC-CGs. Spectra are available for 868 galaxies (90% of the whole catalog); 67 % of them show nuclear activity (AGN or Star...
A new sample of bright galaxy pairs in UZC (2006)
Focardi, P., Zitelli, V., Marinoni, S., Kelm, B.
We present a new sample of bright galaxy pairs extracted applying an objective selection code to UZC catalog.The sample is volume limited to M$_{zw}$ = -18.9 +5 log ${\it h}$ and contains 89 galaxy...
Optical properties of the NGC 5328 group of galaxies (2005)
Gruetzbauch, R., Annibali, F., Bressan, A., Focardi, P., Kelm, B., Rampazzo, R., ...
We present the results of a photometric and spectroscopic study of seven members of the NGC 5328 group of galaxies, a chain of galaxies spanning over 200 kpc (H_0 = 70 km/s/Mpc). We analyze the...
The spectral-type/luminosity and the spectral type/satellite-density relations in the 2dFGRS (2005)
Kelm, B., Focardi, P., Sorrentino, G.
We examine the relative fractions of passive (Type 1), quiet-SF (Type 2) and active-SF (Type 3+4) galaxies as a function of luminosity and number of neighbours in several volume limited samples...
Small-scale systems of galaxies. II. Properties of the NGC 4756 group of galaxies (2004)
Gruetzbauch, R., Kelm, B., Focardi, P., Trinchieri, G., Rampazzo, R., Zeilinger, W. W.
We present results from a study of the NGC 4756 group which is dominated by the elliptical galaxy NGC 5746. The characteristics of the group are investigated through (a) the detailed investigation of...
Single Star-forming galaxies and Star-forming galaxies in SF+SF and mixed pairs (2004)
We compare the SFR of single star-forming galaxies with the SFR of star-forming galaxies in pairs. Volume-limited samples are compared selected from the 2dFGRS, applying a maximum magnitude...
The environment of Seyferts, Liners and HII galaxies in a Complete AGN sample (2004)
Zitelli, V., Kelm, B., Focardi, P., Montanaro, S.
We use a complete AGN sample (Ho et al. 1997) to study the environment of Seyferts, LINERs and HII galaxies. For each AGN we search for companions in the UZC redshift catalogue and compute local as...
1.8 THz superconductive hot-electron bolometer mixer for Herschel (2004)
Kawamura, J. H., Harding, D., McGrath, W., Bumble, B., LeDuc, R., Focardi, P.
Electromagnetic model for twin slot terahertz mixers (2004)
Focardi, P., Neto, A., McGrath, W. R.
Twin slot antennas coupled to superconducting devices are currently being developed for terahertz mixers and direct detectors for astronomical observations.
Dominant galaxies in 2dF groups (2004)
We investigate whether the spectral-type of a locally dominant (most luminous) galaxy can be used to select sets of galaxies that are physically associated (groups). We assume that passive dominants...
Seyfert galaxies in UZC-Compact Groups (2004)
Kelm, B., Focardi, P., Zitelli, V.
We present results concerning the occurrence of Seyfert galaxies in a new automatically selected sample of nearby Compact Groups of galaxies (UZC-CGs). Seventeen Seyferts are found, constituting ~3%...
Active star-forming galaxies in pairs in the 2dF (2003)
Sorrentino, G., Kelm, B., Focardi, P.
We explore the close environment of active star-forming galaxies (ASF) in the 2dF. We find ASF galaxies to be the most likely population to inhabit extremely close pairs located in low density...
Star-forming galaxies in the 2dFGRS (2003)
Kelm, B., Sorrentino, G., Focardi, P.
We examine the environment of star-forming galaxies selected in the 2dFGRS. We find that bright star-forming galaxies display a significant deficit of faint neighbours relative to passive galaxies....
Small scale systems of galaxies I. Photometric and spectroscopic properties of members (2003)
Tanvuia, L., Kelm, B., Focardi, P., Rampazzo, R., Zeilinger, W. W.
This paper is the first of a series addressed to the investigation of galaxy formation/evolution in small scale systems of galaxies (SSSGs) which are located in low density cosmic environments. Our...
Seyfert Galaxies in Compact Groups (2002)
Focardi, P., Kelm, B., Zitelli, V., Sarti, G.
We present results concerning the occurrence of Seyfert galaxies in a new large sample of Compact Groups (Focardi & Kelm 2002). Seyfert galaxies turn out to be relatively rare (
Biviano, A., Katgert, P., Mazure, A., Moles, M., DenHartog, R., Perea, J., ...
We have studied the frequency of occurrence, the kinematics and the spatial distribution of Emission-Line Galaxies (ELG) in clusters in the ESO Nearby Abell Cluster Survey (ENACS). More than 90% of...
The Kinematics of Emission-Line Galaxies in Clusters from ENACS (1995)
Biviano, A., Katgert, P., Mazure, A., Moles, M., Hartog, R. Den, Focardi, P.
Summary - By using the data from the ESO Nearby Abell Cluster Survey (ENACS), we have studied the properties of emission-line galaxies (ELG) in clusters. The fraction of ELG in clusters is 16~\%;...
The Kinematics of Emission-Line Galaxies in Clusters from ENACS (1995)
Biviano, A., Katgert, P., Mazure, A., Moles, M., Hartog, R. Den, Focardi, P.
By using the ENACS data, we have studied the properties of emission-line galaxies (ELG) in clusters. The fraction of ELG in clusters is 16~%; this fraction is slightly dependent on the cluster...
The eso nearby abell cluster survey (ENACS) (1995)
Mazure, A., Katgert, P., Den Hartog, R., Biviano, A., Dubath, P., Escalera, E., ...
Structure and dynamics or rich galaxy clusters: an ESO key-programme (1995)
Biviano, A., Mazure, A., Katgert, P., Den Hartog, R., Dubath, P., Escalera, E., ...
The eso nearby abell cluster survey (ENACS) (1995)
Mazure, A., Katgert, P., Den Hartog, R., Biviano, A., Dubath, P., Escalera, E., ...
Structure and dynamics or rich galaxy clusters: an ESO key-programme (1995)
Biviano, A., Mazure, A., Katgert, P., Den Hartog, R., Dubath, P., Escalera, E., ...
Star Formation in Dwarf Irregular Galaxies: NGC 6822 (1994)
Marconi, G., Tosi, M., Greggio, L., Focardi, P.
Our proposed method to study the star formation histories in nearby irregulars is here applied to NGC 6822. To this purpose we have obtained accurate CCD photometry of three regions in the galaxy,...