Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue

The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the BAT instrument onboard the <i>Neil Gehrels Swift Observatory</i> (hereafter Swift) is unknown because of the lack of an identified longer-wavelength counterpart. Without such follow-up, an...

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Detalles Bibliográficos
Autores principales: Marchesini, Ezequiel Joaquín, Masetti, N., Palazzi, Eliana, Chavushyan, V. H., Jiménez Bailón, Elena, Patiño Álvarez, V., Reynaldi, María Victoria, Rojas, A. F., Saviane, Ivo, Andruchow, Ileana, Bassani, L., Bazzano, Ángela, Bird, A. J., Malizia, Ángela, Minniti, Dante, Monaco, Lorenzo, Stephen, John B., Ubertini, P.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Astronómicas
Ciencias Exactas
Galaxies: Seyfert
quasars: emission lines
BL Lacertae objects: general
X-rays: binaries
Stars: novae, cataclysmic variables
X-rays: individuals
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125223
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125223
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Ciencias Exactas
Galaxies: Seyfert
quasars: emission lines
BL Lacertae objects: general
X-rays: binaries
Stars: novae, cataclysmic variables
X-rays: individuals
spellingShingle Ciencias Astronómicas
Ciencias Exactas
Galaxies: Seyfert
quasars: emission lines
BL Lacertae objects: general
X-rays: binaries
Stars: novae, cataclysmic variables
X-rays: individuals
Marchesini, Ezequiel Joaquín
Masetti, N.
Palazzi, Eliana
Chavushyan, V. H.
Jiménez Bailón, Elena
Patiño Álvarez, V.
Reynaldi, María Victoria
Rojas, A. F.
Saviane, Ivo
Andruchow, Ileana
Bassani, L.
Bazzano, Ángela
Bird, A. J.
Malizia, Ángela
Minniti, Dante
Monaco, Lorenzo
Stephen, John B.
Ubertini, P.
Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
topic_facet Ciencias Astronómicas
Ciencias Exactas
Galaxies: Seyfert
quasars: emission lines
BL Lacertae objects: general
X-rays: binaries
Stars: novae, cataclysmic variables
X-rays: individuals
description The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the BAT instrument onboard the <i>Neil Gehrels Swift Observatory</i> (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.
format Articulo
Preprint
author Marchesini, Ezequiel Joaquín
Masetti, N.
Palazzi, Eliana
Chavushyan, V. H.
Jiménez Bailón, Elena
Patiño Álvarez, V.
Reynaldi, María Victoria
Rojas, A. F.
Saviane, Ivo
Andruchow, Ileana
Bassani, L.
Bazzano, Ángela
Bird, A. J.
Malizia, Ángela
Minniti, Dante
Monaco, Lorenzo
Stephen, John B.
Ubertini, P.
author_facet Marchesini, Ezequiel Joaquín
Masetti, N.
Palazzi, Eliana
Chavushyan, V. H.
Jiménez Bailón, Elena
Patiño Álvarez, V.
Reynaldi, María Victoria
Rojas, A. F.
Saviane, Ivo
Andruchow, Ileana
Bassani, L.
Bazzano, Ángela
Bird, A. J.
Malizia, Ángela
Minniti, Dante
Monaco, Lorenzo
Stephen, John B.
Ubertini, P.
author_sort Marchesini, Ezequiel Joaquín
title Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
title_short Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
title_full Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
title_fullStr Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
title_full_unstemmed Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
title_sort optical spectroscopic classification of 35 hard x-ray sources from the swift-bat 70-month catalogue
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125223
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