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/20.500.12386/24901
Title: On R-W1 as A Diagnostic to Discover Obscured Active Galactic Nuclei in Wide-area X-Ray Surveys
Authors: LaMassa, Stephanie M.
Civano, Francesca
Brusa, Marcella
Stern, Daniel
Glikman, Eilat
Gallagher, Sarah
Urry, C. Meg
Cales, Sabrina
CAPPELLUTI, Nico
Cardamone, Carolin
COMASTRI, Andrea 
Farrah, Duncan
Greene, Jenny E.
Komossa, S.
Merloni, Andrea
Mroczkowski, Tony
Natarajan, Priyamvada
Richards, Gordon
Salvato, Mara
Schawinski, Kevin
Treister, Ezequiel
Issue Date: 2016
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 818
Issue: 1
First Page: 88
Abstract: Capitalizing on the all-sky coverage of WISE and the 35% and 50% sky coverage from Sloan Digital Sky Survey and Pan-STARRS, respectively, we explore the efficacy of m<SUB>R</SUB> (optical) - {m}<SUB>3.4μ {{m</SUB>}} (mid-infrared), hereafter R-W1, as a color diagnostic to identify obscured supermassive black hole accretion in wide-area X-ray surveys. We use the ∼16.5 deg<SUP>2</SUP> Stripe 82 X-ray survey data as a test bed to compare R-W1 with R - K, an oft-used obscured active galactic nucleus (AGN) selection criterion, and examine where different classes of objects lie in this parameter space. Most stars follow a well-defined path in R - K versus R-W1 space. We demonstrate that optically normal galaxies hosting X-ray AGNs at redshifts 0.5\lt z\lt 1 can be recovered with an R-W1\gt 4 color cut, while they typically are not selected as AGNs based on their W1-W2 colors. Additionally, different observed X-ray luminosity bins favor different regions in R-W1 parameter space: moderate-luminosity AGNs (10<SUP>43</SUP> erg {{{s}}}<SUP>-1</SUP>\lt {L}<SUB>0.5-10{keV</SUB>}\lt {10}<SUP>44</SUP> erg s<SUP>-1</SUP>) tend to have red colors, while the highest-luminosity AGNs ({L}<SUB>0.5-10{keV</SUB>}\gt {10}<SUP>45</SUP> erg s<SUP>-1</SUP>) have bluer colors; higher spectroscopic completeness of the Stripe 82X sample is needed to determine whether this is a selection effect or an intrinsic property. Finally, we parameterize X-ray obscuration of Stripe 82X AGNs by calculating their hardness ratios (HRs) and find no clear trends between HR and optical reddening. Our results will help inform best-effort practices in following up obscured AGN candidates in current and future wide-area, shallow X-ray surveys, including the all-sky eROSITA mission.
URI: http://hdl.handle.net/20.500.12386/24901
URL: https://iopscience.iop.org/article/10.3847/0004-637X/818/1/88
https://iopscience.iop.org/article/10.3847/0004-637X/818/1/88/pdf
ISSN: 0004-637X
DOI: 10.3847/0004-637X/818/1/88
Bibcode ADS: 2016ApJ...818...88L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
1511.02883.pdfpostprint3.87 MBAdobe PDFView/Open
LaMassa_2016_ApJ_818_88.pdfpdf editoriale2.07 MBAdobe PDFView/Open
Show full item record

Page view(s)

17
checked on Jan 24, 2021

Download(s)

5
checked on Jan 24, 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