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

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dc.contributor.authorParisi, P
dc.contributor.authorMasetti, N
dc.contributor.authorJiménez-Bailón, E
dc.contributor.authorChavushyan, V
dc.contributor.authorPalazzi, E
dc.contributor.authorLandi, R
dc.contributor.authorMalizia, A
dc.contributor.authorBassani, L
dc.contributor.authorBazzano, A
dc.contributor.authorBird, A J
dc.contributor.authorCharles, P A
dc.contributor.authorGalaz, G
dc.contributor.authorMason, E
dc.contributor.authorMcBride, V A
dc.contributor.authorMinniti, D
dc.contributor.authorMorelli, L
dc.contributor.authorSchiavone, F
dc.contributor.authorUbertini, P
dc.date.accessioned2021-10-08T11:01:06Z
dc.date.available2021-10-08T11:01:06Z
dc.date.issued2012
dc.description.abstractThrough an optical campaign performed at 4 telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we have obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/BAT and listed in the 39 months Palermo catalogue. All these objects have also observations taken with Swift/XRT or XMM-EPIC which not only allow us to pinpoint their optical counterpart, but also to 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 AGN; 7 are classified as type 1 while 21 are of type 2; the remaining object is a galactic cataclysmic variable. Among our type 1 AGN, 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 have been able to estimate the central black hole mass. Three of the type 2 AGN of our sample display optical features typical of the LINER class 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 have also investigated the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For them, we have also compared the X-ray absorption (due to gas) with the optical reddening (due to 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 by Maiolino et al. (2001); this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN.
dc.identifier.apacitationParisi, 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. <i>Astronomy and Astrophysics</i>, 545(4), A101 - 177. http://hdl.handle.net/11427/35087en_ZA
dc.identifier.chicagocitationParisi, P, N Masetti, E Jiménez-Bailón, V Chavushyan, E Palazzi, R Landi, A Malizia, et al "Accurate classification of 29 objects detected in the 39 month Palermo Swift /BAT hard X-ray catalogue." <i>Astronomy and Astrophysics</i> 545, 4. (2012): A101 - 177. http://hdl.handle.net/11427/35087en_ZA
dc.identifier.citationParisi, P., Masetti, N., Jiménez-Bailón, E., Chavushyan, V., Palazzi, E., Landi, R., Malizia, A. & Bassani, L. et al. 2012. Accurate classification of 29 objects detected in the 39 month Palermo Swift /BAT hard X-ray catalogue. <i>Astronomy and Astrophysics.</i> 545(4):A101 - 177. http://hdl.handle.net/11427/35087en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article 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 AB - Through an optical campaign performed at 4 telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we have obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/BAT and listed in the 39 months Palermo catalogue. All these objects have also observations taken with Swift/XRT or XMM-EPIC which not only allow us to pinpoint their optical counterpart, but also to 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 AGN; 7 are classified as type 1 while 21 are of type 2; the remaining object is a galactic cataclysmic variable. Among our type 1 AGN, 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 have been able to estimate the central black hole mass. Three of the type 2 AGN of our sample display optical features typical of the LINER class 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 have also investigated the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For them, we have also compared the X-ray absorption (due to gas) with the optical reddening (due to 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 by Maiolino et al. (2001); this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN. DA - 2012 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2012 SM - 0004-6361 SM - 1432-0746 T1 - Accurate classification of 29 objects detected in the 39 month Palermo Swift /BAT hard X-ray catalogue TI - Accurate classification of 29 objects detected in the 39 month Palermo Swift /BAT hard X-ray catalogue UR - http://hdl.handle.net/11427/35087 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35087
dc.identifier.vancouvercitationParisi P, Masetti N, Jiménez-Bailón E, Chavushyan V, Palazzi E, Landi R, et al. Accurate classification of 29 objects detected in the 39 month Palermo Swift /BAT hard X-ray catalogue. Astronomy and Astrophysics. 2012;545(4):A101 - 177. http://hdl.handle.net/11427/35087.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue4
dc.source.journalvolume545
dc.source.paginationA101 - 177
dc.source.urihttps://dx.doi.org/10.1051/0004-6361/201219192
dc.subject.otheratomic data
dc.subject.otherX-rays: galaxies
dc.subject.otherX-rays: binaries
dc.subject.othernovae, cataclysmic variables
dc.subject.othernovae
dc.subject.othercataclysmic variables
dc.titleAccurate classification of 29 objects detected in the 39 month Palermo Swift /BAT hard X-ray catalogue
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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