Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28596
Title: Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
Authors: Marchesini, E. J.
MASETTI, NICOLA 
PALAZZI, ELIANA 
Chavushyan, V.
Jiménez-Bailón, E.
Patiño-Álvarez, V. M.
Reynaldi, V.
Rojas, A. F.
Saviane, I.
Andruchow, I.
BASSANI, LOREDANA 
BAZZANO, ANGELA 
Bird, A. J.
MALIZIA, ANGELA 
Minniti, D.
Monaco, L.
STEPHEN, JOHN BUCHAN 
Ubertini, P.
Issue Date: 2019
Journal: ASTROPHYSICS AND SPACE SCIENCE 
Number: 364
Issue: 9
First Page: 1
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. <P />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. <P />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. <P />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. <P />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.
URI: http://hdl.handle.net/20.500.12386/28596
URL: https://link.springer.com/article/10.1007%2Fs10509-019-3642-9
ISSN: 0004-640X
DOI: 10.1007/s10509-019-3642-9
Bibcode ADS: 2019Ap&SS.364..153M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
2007.12609.pdfpostprint2.91 MBAdobe PDFView/Open
Marchesini2019_Article_OpticalSpectroscopic.pdf[Administrators only]5.08 MBAdobe PDF
Show full item record

Page view(s)

7
checked on Jan 25, 2021

Download(s)

3
checked on Jan 25, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE