@article{f3d6201c6a7f486c886fb0f5260b1887,
title = "Unveiling the nature of INTEGRAL objects through optical spectroscopy: X. A new multi-year, multi-observatory campaign",
abstract = "Within the framework of our program (running since 2004) of identification of hard X-ray INTEGRAL sources through optical spectroscopy, we present the results concerning the nature of 33 high-energy objects. The data were acquired with the use of six telescopes of different sizes and from one on-line archive. The results indicate that the majority of these objects (23 out of 33) are active galactic nuclei (AGNs), whereas 10 are sources in the local Universe with eight of which in the Galaxy and two in the Small Magellanic Cloud (SMC). Among the identified AGNs, 13 are of Type 1 (i.e., with broad emission lines), eight are of Type 2 (with narrow emissions only), and two are X-ray bright, optically normal galaxies with no apparent nuclear activity in the optical. Six of these AGNs lie at high redshift (z > 0.5). Concerning local objects, we found that five of them are Galactic cataclysmic variables, three are high-mass X-ray binaries (two of which lying in the SMC), one is a low-mass X-ray binary, and one is classified as a flare star that is likely of RS CVn type. The main optical properties and inferred physical characteristics of these sources are presented and discussed.",
keywords = "Galaxies: Seyfert, Novae, cataclysmic variables, Quasars: emission lines, Stars: flare, X-rays: binaries",
author = "N. Masetti and P. Parisi and E. Palazzi and E. Jim{\'e}nez-Bail{\'o}n and V. Chavushyan and V. McBride and Rojas, \{A. F.\} and L. Steward and L. Bassani and A. Bazzano and Bird, \{A. J.\} and Charles, \{P. A.\} and G. Galaz and R. Landi and A. Malizia and E. Mason and D. Minniti and L. Morelli and F. Schiavone and Stephen, \{J. B.\} and P. Ubertini",
note = "Funding Information: We thank Silvia Galleti for Service Mode observations at the Loiano telescope, and Roberto Gualandi for night assistance; Giorgio Martorana and Mauro Rebeschini for Service Mode observations at the Asiago telescope and Luciano Traverso for coordinating them; Aldo Fiorenzano, Vania Lorenzi and Walter Boschin for Service Mode observations at the TNG; Manuel Hern{\'a}ndez, Rodrigo Hern{\'a}ndez, Alberto {\'A}lvarez and Alberto Miranda for Service Mode observations at the CTIO telescope and Fred Walter for coordinating them. NM thanks Daniel Stern for useful discussions. We also thank the anonymous referee for the high consideration expressed about this work. This research has made use of the ASI Science Data Center Multimission Archive; it also used the NASA Astrophysics Data System Abstract Service, the NASA/IPAC Extragalactic Database (NED), and the NASA/IPAC Infrared Science Archive, which are operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This publication made use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has also made use of data extracted from the Six-degree Field Galaxy Survey archive; it has also made use of the SIMBAD and VIZIER databases operated at CDS, Strasbourg, France, and of the HyperLeda catalogue operated at the Observatoire de Lyon, France. NM acknowledges financial support via ASI-INAF agreement No. I/009/10/0 and thanks the Departamento de Astronom{\'i}a y Astrof{\'i}sica of the Pontificia Universidad Cat{\'o}lica de Chile in Santiago for the warm hospitality during the preparation of this paper. PP and RL are supported by the ASI-INAF agreement No. I/033/10/0. DM is supported by the BASAL CATA PFB-06 and FONDECYT No. 1130196 grants. LM acknowledges financial support from the University of Padua through grant No. CPS0204.",
year = "2013",
doi = "10.1051/0004-6361/201322026",
language = "English",
volume = "556",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}