giovanni zamorani - Academia.edu (original) (raw)

Papers by giovanni zamorani

Research paper thumbnail of The X-Ray Luminosity Function of Active Galactic Nuclei

arXiv (Cornell University), Aug 26, 1999

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Research paper thumbnail of Redshift survey of intercluster galaxies (Bardelli+, 2000)

ABSTRACT

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Research paper thumbnail of Large Scale Galaxy Distribution and Merging Clusters in the Shapley Concentration

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Research paper thumbnail of The X-Ray Background and the Rosat Deep Surveys

Exploring the Universe - A Festschrift in Honor of Ricardo Giacconi, 2000

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Research paper thumbnail of Search and characterization of star-forming galaxies in X-ray surveys

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Research paper thumbnail of Large-Scale Distribution and Spectral Properties of Galaxies in the Shapley Concentration

ESO ASTROPHYSICS SYMPOSIA

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Research paper thumbnail of The Violent Environment of the Shapley Concentration: a Multiwavelength View

ESO ASTROPHYSICS SYMPOSIA

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Research paper thumbnail of ROSAT Deep Survey in the Lockman Hole (Hasinger+, 1998)

The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, e... more The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, encompassing an exposure time of 207ksec with the PSPC and a total of 1.32Msec with the HRI aboard ROSAT. Here we present the complete catalogue of 50 X-ray sources with PSPC fluxes (0.5-2 keV) above 5.5x10-15erg/cm2/s. (1 data file).

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Research paper thumbnail of A deep X ray survey in the Lockman hole and the soft X ray log N - log S

The longest pointed observation (152 ksec) with the Rosat position sensitive proportional counter... more The longest pointed observation (152 ksec) with the Rosat position sensitive proportional counter in the direction of the absolutely lowest neutral hydrogen column density is discussed. 26 shallower fields from the Rosat medium sensivity survey are analyzed. 1176 X-ray sources were detected in at least one Rosat energy band in these fields covering a total solid angle of 9.3 deg; 661 of these sources constitute a statistically complete sample detected in the hard band with 0.5 to 2 keV fluxes greater than 2.5 times 10 to the power of minus 15 erg/sq cm s. The faintest limiting flux of the survey is analyzed. Detailed simulations show that confusion effects and other selection biases are relatively small and can be corrected for in the sample. From an analysis in the Lockman field, a best fit slope of approximately 1.8 is found for the extrapolation of the differential X-ray counts below 2.5 times 10 to the power of minus 15 erg/sq cm s. On the basis of this analysis an upper limit o...

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Research paper thumbnail of A Distant, X-ray Selected, Gravitationally-Lensing Galaxy Cluster

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Research paper thumbnail of The High-Redshift AGN COSMOS Universe

The X-ray Universe …, 2011

... Authors: Civano, Francesca; Brusa, Marcella; Comastri, Andrea; Elvis, Martin; Fruscione, Anto... more ... Authors: Civano, Francesca; Brusa, Marcella; Comastri, Andrea; Elvis, Martin; Fruscione, Antonella; Salvato, Mara; Zamorani, Gianni. Publication: The X-ray Universe 2011, Presentations of the Conference held in Berlin, Germany, 27-30 June 2011. ...

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Research paper thumbnail of Constraint on Galaxy Evolution from Faint Observations

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Research paper thumbnail of XMM-Newton wide-field survey in COSMOS field (Cappelluti+, 2009)

ABSTRACT This is the catalogue of point-like X-ray sources detected with the EPIC CCD cameras. Th... more ABSTRACT This is the catalogue of point-like X-ray sources detected with the EPIC CCD cameras. The catalogs contains a total of 1887 unique sources detected in at least one band with likelihood parameter detml>10. The survey, which shows unprecedented homogeneity, has a flux limit of ~1.7x10-15erg/cm2/s, ~9.3x10-15erg/cm2/s and 1.3x10-14erg/cm2/s over 90% of the area (1.92deg2^) in the 0.5-2keV, 2-10keV and 5-10keV energy band, respectively. (1 data file).

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Research paper thumbnail of Chandra COSMOS survey I.(Elvis+, 2009)

Elvis, M.; Civano, F.; Vignali, C.; Puccetti, S.; Fiore, F.; Cappelluti, N.; Aldcroft, TL; Frusci... more Elvis, M.; Civano, F.; Vignali, C.; Puccetti, S.; Fiore, F.; Cappelluti, N.; Aldcroft, TL; Fruscione, A.; Zamorani, G.; Comastri, A.; Brusa, M.; Gilli, R.; Miyaji, T.; Damiani, F.; Koekemoer, AM; Finoguenov, A.; Brunner, H.; Urry, CM; Silverman, J.; Mainieri, V.; Hasinger, G.; Griffiths, ...

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Research paper thumbnail of The LARI Method for ISO-CAM/PHOT Data Reduction and Analysis

Arxiv preprint astro-ph/ …, 2002

The techniques and software tools developed for the reduction and analysis of ISO-CAM/PHOT data w... more The techniques and software tools developed for the reduction and analysis of ISO-CAM/PHOT data with the LARI method are presented. The method, designed for the detection of faint sources in ISO raster observations, is based on the assumption of the existence of ...

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Research paper thumbnail of Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair

Astronomy & Astrophysics, 2019

While theoretical arguments predict that most of the early growth of supermassive black holes (SM... more While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting z > 6 quasars (QSOs) are strongly biased against obscured QSOs, thus considerably limiting our understanding of accreting SMBHs during the first gigayear of the Universe from an observational point of view. We report the Chandra discovery of the first heavily obscured QSO candidate in the early universe, hosted by a close (≈5 kpc) galaxy pair at z = 6.515. One of the members is an optically classified type-1 QSO, PSO167–13. The companion galaxy was first detected as a [C II] emitter by Atacama large millimeter array (ALMA). An X-ray source is significantly (P = 0.9996) detected by Chandra in the 2–5 keV band, with < 1.14 net counts in the 0.5–2 keV band, although the current positional uncertainty does not allow a conclusive association with either PSO167–13 or its companion galaxy. From ...

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Research paper thumbnail of The nature of the X-ray emission in quasars

Memorie Della Societa Astronomica Italiana, 1985

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Research paper thumbnail of VizieR Online Data Catalog: Extremely Red Objects XMM-Newton observations (Brusa+, 2005)

Vizier Online Data Catalog, Feb 1, 2005

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Research paper thumbnail of Selection Effects in Surface Brightness in Deep Surveys

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Research paper thumbnail of The most obscured AGN in COSMOS: infrared properties of X-ray selected AGN

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Research paper thumbnail of The X-Ray Luminosity Function of Active Galactic Nuclei

arXiv (Cornell University), Aug 26, 1999

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Research paper thumbnail of Redshift survey of intercluster galaxies (Bardelli+, 2000)

ABSTRACT

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Research paper thumbnail of Large Scale Galaxy Distribution and Merging Clusters in the Shapley Concentration

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The X-Ray Background and the Rosat Deep Surveys

Exploring the Universe - A Festschrift in Honor of Ricardo Giacconi, 2000

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Research paper thumbnail of Search and characterization of star-forming galaxies in X-ray surveys

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Large-Scale Distribution and Spectral Properties of Galaxies in the Shapley Concentration

ESO ASTROPHYSICS SYMPOSIA

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Research paper thumbnail of The Violent Environment of the Shapley Concentration: a Multiwavelength View

ESO ASTROPHYSICS SYMPOSIA

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Research paper thumbnail of ROSAT Deep Survey in the Lockman Hole (Hasinger+, 1998)

The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, e... more The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, encompassing an exposure time of 207ksec with the PSPC and a total of 1.32Msec with the HRI aboard ROSAT. Here we present the complete catalogue of 50 X-ray sources with PSPC fluxes (0.5-2 keV) above 5.5x10-15erg/cm2/s. (1 data file).

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Research paper thumbnail of A deep X ray survey in the Lockman hole and the soft X ray log N - log S

The longest pointed observation (152 ksec) with the Rosat position sensitive proportional counter... more The longest pointed observation (152 ksec) with the Rosat position sensitive proportional counter in the direction of the absolutely lowest neutral hydrogen column density is discussed. 26 shallower fields from the Rosat medium sensivity survey are analyzed. 1176 X-ray sources were detected in at least one Rosat energy band in these fields covering a total solid angle of 9.3 deg; 661 of these sources constitute a statistically complete sample detected in the hard band with 0.5 to 2 keV fluxes greater than 2.5 times 10 to the power of minus 15 erg/sq cm s. The faintest limiting flux of the survey is analyzed. Detailed simulations show that confusion effects and other selection biases are relatively small and can be corrected for in the sample. From an analysis in the Lockman field, a best fit slope of approximately 1.8 is found for the extrapolation of the differential X-ray counts below 2.5 times 10 to the power of minus 15 erg/sq cm s. On the basis of this analysis an upper limit o...

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Research paper thumbnail of A Distant, X-ray Selected, Gravitationally-Lensing Galaxy Cluster

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Research paper thumbnail of The High-Redshift AGN COSMOS Universe

The X-ray Universe …, 2011

... Authors: Civano, Francesca; Brusa, Marcella; Comastri, Andrea; Elvis, Martin; Fruscione, Anto... more ... Authors: Civano, Francesca; Brusa, Marcella; Comastri, Andrea; Elvis, Martin; Fruscione, Antonella; Salvato, Mara; Zamorani, Gianni. Publication: The X-ray Universe 2011, Presentations of the Conference held in Berlin, Germany, 27-30 June 2011. ...

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Research paper thumbnail of Constraint on Galaxy Evolution from Faint Observations

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Research paper thumbnail of XMM-Newton wide-field survey in COSMOS field (Cappelluti+, 2009)

ABSTRACT This is the catalogue of point-like X-ray sources detected with the EPIC CCD cameras. Th... more ABSTRACT This is the catalogue of point-like X-ray sources detected with the EPIC CCD cameras. The catalogs contains a total of 1887 unique sources detected in at least one band with likelihood parameter detml&gt;10. The survey, which shows unprecedented homogeneity, has a flux limit of ~1.7x10-15erg/cm2/s, ~9.3x10-15erg/cm2/s and 1.3x10-14erg/cm2/s over 90% of the area (1.92deg2^) in the 0.5-2keV, 2-10keV and 5-10keV energy band, respectively. (1 data file).

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Research paper thumbnail of Chandra COSMOS survey I.(Elvis+, 2009)

Elvis, M.; Civano, F.; Vignali, C.; Puccetti, S.; Fiore, F.; Cappelluti, N.; Aldcroft, TL; Frusci... more Elvis, M.; Civano, F.; Vignali, C.; Puccetti, S.; Fiore, F.; Cappelluti, N.; Aldcroft, TL; Fruscione, A.; Zamorani, G.; Comastri, A.; Brusa, M.; Gilli, R.; Miyaji, T.; Damiani, F.; Koekemoer, AM; Finoguenov, A.; Brunner, H.; Urry, CM; Silverman, J.; Mainieri, V.; Hasinger, G.; Griffiths, ...

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Research paper thumbnail of The LARI Method for ISO-CAM/PHOT Data Reduction and Analysis

Arxiv preprint astro-ph/ …, 2002

The techniques and software tools developed for the reduction and analysis of ISO-CAM/PHOT data w... more The techniques and software tools developed for the reduction and analysis of ISO-CAM/PHOT data with the LARI method are presented. The method, designed for the detection of faint sources in ISO raster observations, is based on the assumption of the existence of ...

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Research paper thumbnail of Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair

Astronomy & Astrophysics, 2019

While theoretical arguments predict that most of the early growth of supermassive black holes (SM... more While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting z > 6 quasars (QSOs) are strongly biased against obscured QSOs, thus considerably limiting our understanding of accreting SMBHs during the first gigayear of the Universe from an observational point of view. We report the Chandra discovery of the first heavily obscured QSO candidate in the early universe, hosted by a close (≈5 kpc) galaxy pair at z = 6.515. One of the members is an optically classified type-1 QSO, PSO167–13. The companion galaxy was first detected as a [C II] emitter by Atacama large millimeter array (ALMA). An X-ray source is significantly (P = 0.9996) detected by Chandra in the 2–5 keV band, with < 1.14 net counts in the 0.5–2 keV band, although the current positional uncertainty does not allow a conclusive association with either PSO167–13 or its companion galaxy. From ...

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Research paper thumbnail of The nature of the X-ray emission in quasars

Memorie Della Societa Astronomica Italiana, 1985

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Research paper thumbnail of VizieR Online Data Catalog: Extremely Red Objects XMM-Newton observations (Brusa+, 2005)

Vizier Online Data Catalog, Feb 1, 2005

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Research paper thumbnail of Selection Effects in Surface Brightness in Deep Surveys

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Research paper thumbnail of The most obscured AGN in COSMOS: infrared properties of X-ray selected AGN

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