The nature of 50 Palermo Swift-BAT hard X-ray objects through optical spectroscopy

Journal
Date Issued
2017
Author(s)
Rojas, A. F.
•
•
Minniti, D.
•
Jiménez-Bailón, E.
•
Chavushyan, V.
•
Hau, G.
•
McBride, V. A.
•
•
•
Bird, A. J.
•
Galaz, G.
•
Gavignaud, I.
•
•
•
Morelli, L.
•
•
Patiño-Álvarez, V.
•
•
Ubertini, P.
DOI
Abstract
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy campaign performed at seven telescopes in the northern and southern hemispheres. These objects were detected with the Burst Alert Telescope (BAT) instrument onboard the Swift satellite and listed as of unidentified nature in the 54-month Palermo BAT catalogue. In detail, 45 sources in our sample are identified as active galactic nuclei of which, 27 are classified as type 1 (with broad and narrow emission lines) and 18 are classified as type 2 (with only narrow emission lines). Among the broad-line emission objects, one is a type 1 high-redshift quasi-stellar object, and among the narrow-line emission objects, one is a starburst galaxy, one is a X-ray bright optically normal galaxy, and one is a low ionization nuclear emission line region. We report 30 new redshift measurements, 13 confirmations and 2 more accurate redshift values. The remaining five objects are galactic sources: three are Cataclismic Variables, one is a X-ray Binary probably with a low mass secondary star, and one is an active star.

Based on observations obtained from the following observatories: Cerro Tololo Interamerican Observatory (Chile); Astronomical Observatory of Bologna in Loiano (Italy); Observatorio Astronómico Nacional (San Pedro Mártir, Mexico); Radcliffe telescope of the South African Astronomical Observatory (Sutherland, South Africa); Sloan Digital Sky Survey; Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias (Canary Islands, Spain) and New Technology Telescope (NTT) of La Silla Observatory, Chile.

Volume
602
Start page
1
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2017A&A...602A.124R
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

26696-2017A+A__602__A124R_P05.pdf

Description
Miur
Size

4.06 MB

Format

Adobe PDF

Checksum (MD5)

45e490b0bc966ef44bd64170df2e633e

Loading...
Thumbnail Image
Name

26696-2017A+A__602__A124R_P04.pdf

Description
Miur
Size

8.82 MB

Format

Adobe PDF

Checksum (MD5)

8a5f0a92d4951dfda3691e9811d8a3e6