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dc.contributor.author
Marchesini, Ezequiel Joaquín  
dc.contributor.author
Masetti, N  
dc.contributor.author
Palazzi, E.  
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Chavushyan, V.  
dc.contributor.author
Jiménez Bailón, E.  
dc.contributor.author
Patiño Álvarez, V. M.  
dc.contributor.author
Reynaldi, María Victoria  
dc.contributor.author
Rojas, A. F.  
dc.contributor.author
Saviane, I.  
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Andruchow, Ileana  
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Bassani, L.  
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Bazzano, A.  
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Bird, A. J.  
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Malizia, A.  
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Minniti, D.  
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Monaco, L.  
dc.contributor.author
Stephen, J. B.  
dc.contributor.author
Ubertini, P.  
dc.date.available
2021-11-03T13:59:45Z  
dc.date.issued
2019-09-13  
dc.identifier.citation
Marchesini, Ezequiel Joaquín; Masetti, N; Palazzi, E.; Chavushyan, V.; Jiménez Bailón, E.; et al.; Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue; Springer; Astrophysics And Space Science; 364; 9; 13-9-2019; 1-39  
dc.identifier.issn
0004-640X  
dc.identifier.uri
http://hdl.handle.net/11336/145817  
dc.description.abstract
The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the BAT instrument onboard the Neil Gehrels Swift Observatory (hereafter Swift) is unknown because of the lack of an identified longer-wavelength counterpart. Without such follow-up, an X-ray catalogue is of limited astrophysical value: we therefore embarked, since 2009, on a long-term project to uncover the optical properties of sources identified by Swift by using a large suite of ground-based telescopes and instruments. In this work, we continue our programme of characterization of unidentified or poorly studied hard X-ray sources by presenting the results of an optical spectroscopic campaign aimed at pinpointing and classifying the optical counterparts of 35 hard X-ray sources taken from the 70-month BAT catalogue. This sample was selected out of the available information about the chosen objects: either they are completely unidentified sources, or their association with a longer-wavelength counterpart is still ambiguous. With the use of optical spectra taken at six different telescopes we were able to identify the main spectral characteristics (continuum type, redshift, and emission or absorption lines) of the observed objects, and determined their nature. We identify and characterize a total of 41 optical candidate counterparts corresponding to 35 hard X-ray sources given that, because of positional uncertainties, multiple lower energy counterparts can sometimes be associated with higher energy detections. We discuss which ones are the actual (or at least most likely) counterparts based on our observational results. In particular, 31 sources in our sample are active galactic nuclei: 16 are classified as Type 1 (with broad and narrow emission lines) and 13 are classified as Type 2 (with narrow emission lines only); two more are BL Lac-type objects. We also identify one LINER, one starburst, and 3 elliptical galaxies. The remaining 5 objects are galactic sources: we identify 4 of them as cataclysmic variables, whereas one is a low mass X-ray binary.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Springer  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
BL LACERTAE OBJECTS: GENERAL  
dc.subject
GALAXIES: SEYFERT  
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QUASARS: EMISSION LINES  
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STARS: NOVAE, CATACLYSMIC VARIABLES  
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X-RAYS: BINARIES  
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X-RAYS: INDIVIDUALS  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2020-11-19T21:57:40Z  
dc.identifier.eissn
1572-946X  
dc.journal.volume
364  
dc.journal.number
9  
dc.journal.pagination
1-39  
dc.journal.pais
Alemania  
dc.description.fil
Fil: Marchesini, Ezequiel Joaquín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Università di Torino; Italia. Istituto Nazionale Di Fisica Nucleare; Italia. Istituto Nazionale di Astrofisica; Italia  
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Fil: Masetti, N. Universidad Andrés Bello; Chile. Istituto Nazionale di Astrofisica; Italia  
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Fil: Palazzi, E.. Istituto Nazionale di Astrofisica; Italia  
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Fil: Chavushyan, V.. Instituto Nacional de Astrofísica, Óptica y Electrónica; México  
dc.description.fil
Fil: Jiménez Bailón, E.. Universidad Nacional Autónoma de México; México  
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Fil: Patiño Álvarez, V. M.. Instituto Nacional de Astrofísica, Óptica y Electrónica; México. Max-Planck-Institut für Radioastronomie; Alemania  
dc.description.fil
Fil: Reynaldi, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina  
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Fil: Rojas, A. F.. Universidad Andrés Bello; Chile. European Southern Observatory Chile; Chile  
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Fil: Saviane, I.. European Southern Observatory Chile; Chile  
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Fil: Andruchow, Ileana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina  
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Fil: Bassani, L.. Istituto Nazionale di Astrofisica; Italia  
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Fil: Bazzano, A.. Istituto Nazionale di Astrofisica; Italia  
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Fil: Bird, A. J.. University of Southampton; Reino Unido  
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Fil: Malizia, A.. Istituto Nazionale di Astrofisica; Italia  
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Fil: Minniti, D.. Instituto Milenio de Astrofísica; Chile. Universidad Andrés Bello; Chile. Vatican Observatory; Italia  
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Fil: Monaco, L.. Universidad Andrés Bello; Chile  
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Fil: Stephen, J. B.. Istituto Nazionale di Astrofisica; Italia  
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Fil: Ubertini, P.. Istituto Nazionale di Astrofisica; Italia  
dc.journal.title
Astrophysics And Space Science  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10509-019-3642-9  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10509-019-3642-9