TY - JOUR
T1 - Accurate classification of 75 counterparts of objects detected in the 54-month Palermo Swift/BAT hard X-ray catalogue
AU - Parisi, P.
AU - Masetti, N.
AU - Rojas, A. F.
AU - Jiménez-Bailón, E.
AU - Chavushyan, V.
AU - Palazzi, E.
AU - Bassani, L.
AU - Bazzano, A.
AU - Bird, A. J.
AU - Galaz, G.
AU - Minniti, D.
AU - Morelli, L.
AU - Ubertini, P.
N1 - Funding Information:
We thank John Stephen for the useful comments and suggestions, Silvia Galleti for Service Mode observations at the Loiano Telescope, and Roberto Gualandi for night assistance, Giorgio Martorana for Service Mode observations at the Asiago Telescope and Luciano Traverso for coordinating them, Manuel Hernández, Rodrigo Hernández and Josè Velasquez for Service Mode observations at the CTIO telescope, and Fred Walter for coordinating them. We also acknowledge the use of public data from the Swift data archive. This research has made use of the ASI Science Data Center Multimission Archive, of the NASA Astrophysics Data System Abstract Service, the NASA/IPAC Extragalactic Database (NED), of 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 and of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA’s GSFC. 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 6dF Galaxy Survey and the Sloan Digitized Sky Survey archives; the SIMBAD database operated at the CDS, Strasbourg, France, and of the HyperLeda catalogue operated at the Observatoire de Lyon, France. The authors acknowledge the ASI and INAF financial support via grants Nos. I/033/10/0, I/009/10/0; P.P. is supported by the INTEGRAL ASI-INAF grant No. I/033/10/0. L.M. is supported by the University of Padua through grant No. CPDR061795/06. G.G. is supported by FONDECYT 1085267. V.C. is supported by the CONACyT research grants 54480 and 151494 (Mexico). D.M. is supported by the Basal CATA PFB 06/09, and FONDAP Center for Astrophysics grant No. 15010003.
PY - 2014/1
Y1 - 2014/1
N2 - Through an optical campaign performed at four telescopes located in the northern and southern hemispheres, we have obtained optical spectroscopy for 75 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/BAT and listed in the 54-month Palermo BAT catalogue. All these objects also have observations taken with the Swift/XRT, ROSAT, or Chandra satellites, which allowed us to reduce the high-energy error box and pinpoint the most likely optical counterpart(s). We found that 69 sources in our sample are active galactic nuclei (AGNs) of which, 35 are classified as type 1 (with broad and narrow emission lines), 33 are classified as type 2 (with only narrow emission lines), and one is a high-redshift quasi-stellar object; the remaining 6 objects are galactic cataclysmic variables. Of the type 1 AGNs, 32 are objects of intermediate Seyfert type (1.2-1.9) and one is narrow-line Seyfert 1 galaxy; for 29 of the 35 type 1 AGNs, we have been able to estimate the central black hole mass and the Eddington ratio. Of the type 2 AGNs, two display optical features typical of the low-ionization nuclear emission-line region class, three are classified as transition objects, one is a starburst galaxy, and two are X-ray bright, optically normal galaxies. All galaxies classified in this work are relatively nearby objects (0.006-0.213) except for one at redshift 1.137.
AB - Through an optical campaign performed at four telescopes located in the northern and southern hemispheres, we have obtained optical spectroscopy for 75 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/BAT and listed in the 54-month Palermo BAT catalogue. All these objects also have observations taken with the Swift/XRT, ROSAT, or Chandra satellites, which allowed us to reduce the high-energy error box and pinpoint the most likely optical counterpart(s). We found that 69 sources in our sample are active galactic nuclei (AGNs) of which, 35 are classified as type 1 (with broad and narrow emission lines), 33 are classified as type 2 (with only narrow emission lines), and one is a high-redshift quasi-stellar object; the remaining 6 objects are galactic cataclysmic variables. Of the type 1 AGNs, 32 are objects of intermediate Seyfert type (1.2-1.9) and one is narrow-line Seyfert 1 galaxy; for 29 of the 35 type 1 AGNs, we have been able to estimate the central black hole mass and the Eddington ratio. Of the type 2 AGNs, two display optical features typical of the low-ionization nuclear emission-line region class, three are classified as transition objects, one is a starburst galaxy, and two are X-ray bright, optically normal galaxies. All galaxies classified in this work are relatively nearby objects (0.006-0.213) except for one at redshift 1.137.
KW - Instrumentation: spectrographs
KW - Line: identification
KW - Methods: data analysis
KW - Techniques: spectroscopic
UR - http://www.scopus.com/inward/record.url?scp=84891667907&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201322409
DO - 10.1051/0004-6361/201322409
M3 - Article
AN - SCOPUS:84891667907
SN - 0004-6361
VL - 561
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A67
ER -