Zobrazeno 1 - 10
of 708
pro vyhledávání: '"Vigotti M."'
Autor:
Montenegro-Montes, F. M., Mack, K. -H., Vigotti, M., Benn, C. R., Carballo, R., Gonzalez-Serrano, J. I., Holt, J., Jimenez-Lujan, F.
We present multi-frequency observations of a sample of 15 radio-emitting Broad Absorption Line Quasars (BAL QSOs), covering a spectral range between 74 MHz and 43 GHz. They display mostly convex radio spectra which typically peak at about 1-5 GHz (in
Externí odkaz:
http://arxiv.org/abs/0805.4746
Autor:
Carballo, R., Gonzalez-Serrano, J. I., Montenegro-Montes, F. M., Benn, C. R., Mack, K. -H., Pedani, M., Vigotti, M.
Publikováno v:
Mon.Not.Roy.Astron.Soc.370:1034-1045,2006
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 spectroscopically from published data (mainly SDSS) or observations reported h
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605298
Autor:
Benn, C. R., Carballo, R., Holt, J., Vigotti, M., Gonzalez-Serrano, J. I., Mack, K. -H., Perley, R. A.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 360 (2005) 1455-1470
We present observations of the most radio-luminous BAL quasar known, 1624+3758, at redshift z = 3.377. The quasar has several unusual properties: (1) The FeII UV191 1787-A emission line is very prominent. (2) The BAL trough (BALnicity index 2990 km/s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504502
Autor:
Holt, J., Benn, C. R., Vigotti, M., Pedani, M., Carballo, R., Gonzalez-Serrano, J. I., Mack, K. -H., Garcia, B.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 348 (2004) 857
We obtained spectra of 60 red, starlike objects (E< 18.8) identified with FIRST radio sources, S_{1.4GHz} > 1 mJy. Eight are QSOs with redshift z> 3.6.Combined with our pilot search (Benn et al 2002), our sample of 121 candidates yields a total of 18
Externí odkaz:
http://arxiv.org/abs/astro-ph/0311127
Autor:
Vigotti, M., Carballo, R., Benn, C. R., de Zotti, G., Fanti, R., Serrano, J. I. Gonzalez, Mack, K. -H., Holt, J.
Publikováno v:
Astrophys.J. 591 (2003) 43-52
We define a new complete sample of 13 optically-luminous radio quasars M_AB(1450 Angstrom) < -26.9 mag and log P_1.4 GHz(W/Hz) > 25.7 with redshift 3.8 < z < 4.5, obtained by cross-correlating the FIRST radio survey and the APM catalogue of POSS-I. W
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303333
Publikováno v:
Astron.Astrophys. 396 (2002) 463-472
We investigate the statistical properties of the polarized emission of extragalactic radio sources and estimate their contribution to the power spectrum of polarization fluctuations in the microwave region. The basic ingredients of our analysis are t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0209502
VLBA observations at 18 cm are presented for 28 Compact Steep-spectrum radio Sources (CSSs) from the B3-VLA CSS sample. These sources were unresolved in previous VLA observations at high frequencies or their brightness distribution was dominated by a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0205200
Autor:
Dallacasa, D., Fanti, C., Giacintucci, S., Stanghellini, C., Fanti, R., Gregorini, L., Vigotti, M.
EVN and MERLIN observations at 18 cm are presented for 18 Compact Steep--spectrum radio Sources (CSSs) from the B3-VLA CSS sample. These sources were marginally resolved in previous VLA A-configuration observations at 4.9 and 8.4 GHz or had peculiar
Externí odkaz:
http://arxiv.org/abs/astro-ph/0205201
We present a sample of 171 candidate groups and clusters of galaxies at intermediate redshift over an area of ~550 square degrees at the South Galactic Pole selected by using optically identified radio sources from the NRAO VLA Sky Survey as tracers
Externí odkaz:
http://arxiv.org/abs/astro-ph/0110302
In order to study the status and the possible evolution of clusters of galaxies at intermediate redshifts (z ~ 0.1 - 0.3), as well as their spatial correlation and relationship with the local environment, we built a sample of candidate groups and clu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0110300