Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue

P. Parisi, N. Masetti, E. Jiménez-Bailón, V. Chavushyan, E. Palazzi, R. Landi, A. Malizia, L. Bassani, A. Bazzano, A. J. Bird, P. A. Charles, G. Galaz, E. Mason, V. A. McBride, D. Minniti, L. Morelli, F. Schiavone, P. Ubertini

Resultado de la investigación: Article

16 Citas (Scopus)

Resumen

Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/Burst Alert Telescope (BAT) and listed in the 39 month Palermo catalogue. All these objects also have observations taken with Swift/X-ray Telescope (XRT) or XMM-European Photon Imaging Camera (EPIC) which not only allow us to pinpoint their optical counterpart, but also study their X-ray spectral properties (column density, power law photon index, and F2-10 keV flux). We find that 28 sources in our sample are active galactic nuclei (AGNs); 7 are classified as type 1, while 21 are of type 2; the remaining object is a Galactic cataclysmic variable. Among our type 1 AGNs, we find 5 objects of intermediate Seyfert type (1.2-1.9) and one narrow-line Seyfert 1 galaxy; for 4 out of 7 sources, we are able to estimate the central black hole mass. Three of the type 2 AGNs of our sample display optical features typical of low-ionization nuclear emission-line regions (LINER) and one is a likely Compton thick AGN. All galaxies classified in this work are relatively nearby objects since their redshifts lie in the range 0.008-0.075; the only Galactic object found lies at an estimated distance of 90 pc. We also investigate the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For these galaxies, we also compare the X-ray absorption (caused by gas) with the optical reddening (caused by dust): we find that for most of our sources, specifically those of type 1.9-2.0 the former is higher than the latter confirming early results of Maiolino and collaborators; this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN.

Idioma originalEnglish
Número de artículoA101
PublicaciónAstronomy and Astrophysics
Volumen545
DOI
EstadoPublished - 2012

Huella dactilar

active galactic nuclei
catalogs
bursts
telescopes
galaxies
x rays
dust
cataclysmic variables
Southern Hemisphere
photons
XMM-Newton telescope
power law
ionization
spectroscopy
radiant flux density
cameras
gas
estimates
gases

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Parisi, P., Masetti, N., Jiménez-Bailón, E., Chavushyan, V., Palazzi, E., Landi, R., ... Ubertini, P. (2012). Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue. Astronomy and Astrophysics, 545, [A101]. https://doi.org/10.1051/0004-6361/201219192
Parisi, P. ; Masetti, N. ; Jiménez-Bailón, E. ; Chavushyan, V. ; Palazzi, E. ; Landi, R. ; Malizia, A. ; Bassani, L. ; Bazzano, A. ; Bird, A. J. ; Charles, P. A. ; Galaz, G. ; Mason, E. ; McBride, V. A. ; Minniti, D. ; Morelli, L. ; Schiavone, F. ; Ubertini, P. / Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue. En: Astronomy and Astrophysics. 2012 ; Vol. 545.
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abstract = "Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/Burst Alert Telescope (BAT) and listed in the 39 month Palermo catalogue. All these objects also have observations taken with Swift/X-ray Telescope (XRT) or XMM-European Photon Imaging Camera (EPIC) which not only allow us to pinpoint their optical counterpart, but also study their X-ray spectral properties (column density, power law photon index, and F2-10 keV flux). We find that 28 sources in our sample are active galactic nuclei (AGNs); 7 are classified as type 1, while 21 are of type 2; the remaining object is a Galactic cataclysmic variable. Among our type 1 AGNs, we find 5 objects of intermediate Seyfert type (1.2-1.9) and one narrow-line Seyfert 1 galaxy; for 4 out of 7 sources, we are able to estimate the central black hole mass. Three of the type 2 AGNs of our sample display optical features typical of low-ionization nuclear emission-line regions (LINER) and one is a likely Compton thick AGN. All galaxies classified in this work are relatively nearby objects since their redshifts lie in the range 0.008-0.075; the only Galactic object found lies at an estimated distance of 90 pc. We also investigate the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For these galaxies, we also compare the X-ray absorption (caused by gas) with the optical reddening (caused by dust): we find that for most of our sources, specifically those of type 1.9-2.0 the former is higher than the latter confirming early results of Maiolino and collaborators; this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN.",
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author = "P. Parisi and N. Masetti and E. Jim{\'e}nez-Bail{\'o}n and V. Chavushyan and E. Palazzi and R. Landi and A. Malizia and L. Bassani and A. Bazzano and Bird, {A. J.} and Charles, {P. A.} and G. Galaz and E. Mason and McBride, {V. A.} and D. Minniti and L. Morelli and F. Schiavone and P. Ubertini",
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Parisi, P, Masetti, N, Jiménez-Bailón, E, Chavushyan, V, Palazzi, E, Landi, R, Malizia, A, Bassani, L, Bazzano, A, Bird, AJ, Charles, PA, Galaz, G, Mason, E, McBride, VA, Minniti, D, Morelli, L, Schiavone, F & Ubertini, P 2012, 'Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue', Astronomy and Astrophysics, vol. 545, A101. https://doi.org/10.1051/0004-6361/201219192

Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue. / Parisi, P.; Masetti, N.; Jiménez-Bailón, E.; Chavushyan, V.; Palazzi, E.; Landi, R.; Malizia, A.; Bassani, L.; Bazzano, A.; Bird, A. J.; Charles, P. A.; Galaz, G.; Mason, E.; McBride, V. A.; Minniti, D.; Morelli, L.; Schiavone, F.; Ubertini, P.

En: Astronomy and Astrophysics, Vol. 545, A101, 2012.

Resultado de la investigación: Article

TY - JOUR

T1 - Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue

AU - Parisi, P.

AU - Masetti, N.

AU - Jiménez-Bailón, E.

AU - Chavushyan, V.

AU - Palazzi, E.

AU - Landi, R.

AU - Malizia, A.

AU - Bassani, L.

AU - Bazzano, A.

AU - Bird, A. J.

AU - Charles, P. A.

AU - Galaz, G.

AU - Mason, E.

AU - McBride, V. A.

AU - Minniti, D.

AU - Morelli, L.

AU - Schiavone, F.

AU - Ubertini, P.

PY - 2012

Y1 - 2012

N2 - Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/Burst Alert Telescope (BAT) and listed in the 39 month Palermo catalogue. All these objects also have observations taken with Swift/X-ray Telescope (XRT) or XMM-European Photon Imaging Camera (EPIC) which not only allow us to pinpoint their optical counterpart, but also study their X-ray spectral properties (column density, power law photon index, and F2-10 keV flux). We find that 28 sources in our sample are active galactic nuclei (AGNs); 7 are classified as type 1, while 21 are of type 2; the remaining object is a Galactic cataclysmic variable. Among our type 1 AGNs, we find 5 objects of intermediate Seyfert type (1.2-1.9) and one narrow-line Seyfert 1 galaxy; for 4 out of 7 sources, we are able to estimate the central black hole mass. Three of the type 2 AGNs of our sample display optical features typical of low-ionization nuclear emission-line regions (LINER) and one is a likely Compton thick AGN. All galaxies classified in this work are relatively nearby objects since their redshifts lie in the range 0.008-0.075; the only Galactic object found lies at an estimated distance of 90 pc. We also investigate the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For these galaxies, we also compare the X-ray absorption (caused by gas) with the optical reddening (caused by dust): we find that for most of our sources, specifically those of type 1.9-2.0 the former is higher than the latter confirming early results of Maiolino and collaborators; this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN.

AB - Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/Burst Alert Telescope (BAT) and listed in the 39 month Palermo catalogue. All these objects also have observations taken with Swift/X-ray Telescope (XRT) or XMM-European Photon Imaging Camera (EPIC) which not only allow us to pinpoint their optical counterpart, but also study their X-ray spectral properties (column density, power law photon index, and F2-10 keV flux). We find that 28 sources in our sample are active galactic nuclei (AGNs); 7 are classified as type 1, while 21 are of type 2; the remaining object is a Galactic cataclysmic variable. Among our type 1 AGNs, we find 5 objects of intermediate Seyfert type (1.2-1.9) and one narrow-line Seyfert 1 galaxy; for 4 out of 7 sources, we are able to estimate the central black hole mass. Three of the type 2 AGNs of our sample display optical features typical of low-ionization nuclear emission-line regions (LINER) and one is a likely Compton thick AGN. All galaxies classified in this work are relatively nearby objects since their redshifts lie in the range 0.008-0.075; the only Galactic object found lies at an estimated distance of 90 pc. We also investigate the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For these galaxies, we also compare the X-ray absorption (caused by gas) with the optical reddening (caused by dust): we find that for most of our sources, specifically those of type 1.9-2.0 the former is higher than the latter confirming early results of Maiolino and collaborators; this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN.

KW - Atomic data

KW - Novae, cataclysmic variables

KW - X-rays: binaries

KW - X-rays: galaxies

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