Spatially Offset AGN

22 Pages·2016·5.87 MB·English

Discovering Spatially Offset Active Galactic Nuclei,
HLXs and IMBH Candidates with Chandra
R. Scott Barrows
Postdoctoral Research Associate
Center for Astrophysics and Space Astronomy
University of Colorado Boulder
Collaborators:
Julie Comerford (CU Boulder), Jenny Greene (Princeton), Dave Pooley (Trinity Univ.)
The role of galaxy mergers for growing
massive black holes
SDSS J084135.09+010156.2 HLX-1
Comerford et al. 2015, ApJ, 806, 219 Farrell et al. 2009, Nat.,460,73
Major mergers of
massive galaxies: Minor merger:
Accreting SMBHs Accreting IMBH?
(Mass=106-109M ) (Mass=103-106M )
Sun Sun
Techniques for building samples of galaxy mergers:
Visually (“by-eye”)
Kocevski et al. 2012, ApJ, 744, 148
Asymmetry
Villforth et al. 2014, MNRAS, 439, 3342
Pairs of distinct galaxies
Silverman et al. 2014, ApJ, 743, 2
Techniques for building samples of galaxy mergers:
Visually (“by-eye”)
Kocevski et al. 2012, ApJ, 744, 148
Asymmetry
Villforth et al. 2014, MNRAS, 439, 3342
Pairs of distinct galaxies
Silverman et al. 2014, ApJ, 743, 2
Spatially Offset AGN
Unambiguous galaxy mergers: Spatially Offset AGN
Optical Emission Lines
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SDSS Seyfert 2 Spectrum
Unambiguous galaxy mergers: Spatially Offset AGN
Optical Emission Lines X-ray Spectra
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SDSS Seyfert 2 Spectrum Chandra X-ray AGN
Select AGN from SDSS using BPT diagram at z<0.21: 20,098
Crossmatch with footprint of Chandra archives: 2,292
Register Chandra image with at least SDSS i- or z-band:
150
Select AGN from SDSS using BPT diagram at z<0.21: 20,098
Crossmatch with footprint of Chandra archives: 2,292
Register Chandra image with at least SDSS i- or z-band:
150
Chandra, 2-10 keV
Hard X-ray source:
- within SDSS fiber
48
- L >1042 erg s-1 (AGN)
X,2-10
0 0.096 0.29 0.67 1.4 3 6 12 24 49 9
Select AGN from SDSS using BPT diagram at z<0.21: 20,098
Crossmatch with footprint of Chandra archives: 2,292
Register Chandra image with at least SDSS i- or z-band:
150
Chandra, 2-10 keV
Hard X-ray source:
- within SDSS fiber
48
- L >1042 erg s-1 (AGN)
X,2-10
0 0.096 0.29 0.67 1.4 3 6 12 24 49 9
3’’
X-ray AGN significantly (>3σ)
9
spatially offset:
SDSS z-band
26 1184 1299 1530 1989 2914 4744 8387 15741 30286 592
Spatially Offset AGN
SDSS g+r+i SDSS
SDSS 2-10 keV
composite +2-10 keV
SDSS g+r+i SDSS
SDSS 2-10 keV
composite +2-10 keV
Barrows et al. 2016, arXiv: 1606.01253
ApJ Accepted