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 9 1 1 L , 3 8 6 , L J p A , 8 0 0 2 . l a t e h t r a B SDSS Seyfert 2 Spectrum Unambiguous galaxy mergers: Spatially Offset AGN Optical Emission Lines X-ray Spectra 9 9 1 1 2 1 , L 6 0 , 3 8 8 , 6 J p , L A J , p 5 A 1 0 , 8 2 0 . 0 al 2 . et al d t r e o f h r e t r m a B o C 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