Chandra s view of local op.cally dull X ray bright galaxies Daryl Haggard CIERA Fellow
Collaborators James Madison University Anca Constan6n Harvard Smithsonian Center for Astrophysics ROSAT Paul J. Green Dong Woo Kim University of Washington ScoE F. Anderson University of Birmingham SDSS Ewan O Sullivan Evanston Township High School Talia Weiss XBONGS, Fall 2011 Chandra Daryl Haggard, Northwestern/CIERA 2
X ray Bright, Op6cally Normal Galaxies XBONG (a.k.a. op6cally dull X ray bright gals) Substan6al (AGN like) X ray luminosity No narrow or broad op6cal emission lines e.g., Elvis et al. 1981 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 3
X ray Bright, Op6cally Normal Galaxies Observa6ons alterna6vely aeributed to: XBONG (a.k.a. op6cally dull X ray bright gals) dilu6on, obscura6on, inefficient accre6on, Substan6al (AGN like) X ray luminosity variability, extended hot gas No narrow or broad op6cal emission lines e.g., Elvis et al. 1981 Low z sample to dis6nguish between scenarios XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 4
X ray Bright, Op6cally Normal Galaxies Why no AGN like op6cal emission lines? Dilu+on: AGN emission diluted by host starlight Moran et al. 2002; Caccianiga et al. 2007; Trump et al. 2009 Obscura+on: Both broad & narrow line regions Comastri et al. 2002; Rigby et al. 2006 obscured Inefficient Accre+on: RIAFs with truncated disks Yuan & Narayan et al. 2004; Trump et al. 2009 (liele op6cal/uv) Variability: data not coeval; 6dal disrup6ons Komassa et al. 2004; Gezari et al. 2006 Extended hot gas: poor or fossil galaxy groups Jones et al. 2003; Georgantopoulos & Georgakakis et al. 2005 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 5
Low z XBONGs A low redshil (z < 0.37) sample enables: High X ray S/N spectral constraints spa6al modeling Hα in the op6cal spectrum Deep, mul6wavlength op6cal data environment studies (via photometric redshils) spectroscopic follow up Host galaxy morphology ROSAT + Chandra enables variability analysis Unique, high resolu6on look at a rare popula6on XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 6
Low z XBONGs A low redshil (z < 0.37) sample enables: High X ray S/N spectral constraints spa6al modeling Hα in the op6cal spectrum Deep, mul6wavlength op6cal data environment studies (via photometric redshils) spectroscopic follow up Host galaxy morphology ROSAT + Chandra enables variability analysis Unique, high resolu6on look at a rare popula6on XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 7
Name (SDSS) Low z XBONG Sample 8 local targets selected for Chandra follow up: r (mag) z RASS (cnts/s) log L x (erg/s) match conf (%) J0814+3827 17.92 0.3133 0.033 44.00 89 J0854+3053 17.94 0.3086 0.026 43.88 78 J1058+4108 18.16 0.3236 0.066 44.34 78 J1200+4834 17.29 0.2747 0.019 43.63 90 J1308+5538 19.07 0.3675 0.020 43.94 89 J1452+4431 18.10 0.2866 0.028 43.85 87 J2047 0619 17.71 0.2520 0.023 43.63 87 J2124+1147 17.56 0.3000 0.019 43.72 79 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 8
Name (SDSS) Low z XBONG Sample SDSS spec r (mag) z ~ 0.3 z RASS (cnts/s) RASS bright log L x (erg/s) match conf (%) J0814+3827 17.92 0.3133 0.033 44.00 89 J0854+3053 17.94 0.3086 0.026 43.88 78 J1058+4108 18.16 0.3236 0.066 44.34 78 J1200+4834 17.29 0.2747 0.019 43.63 90 J1308+5538 19.07 0.3675 0.020 43.94 89 J1452+4431 18.10 0.2866 0.028 43.85 87 J2047 0619 17.71 0.2520 0.023 43.63 87 J2124+1147 17.56 0.3000 0.019 43.72 79 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 9
No Measurable Clustering Associa6on with groups and clusters possible RASS sources not reliably extended un6l 1, but 97% of sources above 20 extent excluded Neighbors have SDSS photometric redshils Bohringer et al. 2000 Eliminate catalog matches RASS XBONG cands no more clustered than non RASS passives XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 10
11668 11667 11666 11665 11664 11663 11662 11661 10 15 ksec Chandra ACIS S exposures 4 5 of 8 appear extended XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 11
Extended X ray Emission XBONGS, Fall 2011 12
SDSS J1200+4834 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 13
SDSS J1200+4834 2D King Model: S(R) = S 0 [1+(r/r c ) 2 ] 3β+½ r c = 8.9pix = 4.38 ~ 18kpc β = 0.48 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 14
SDSS J1200+4834 z = 0.2747 nh = 2.58x10 20 atm/cm 2 MEKAL thermal plasma model fit to X ray spectrum ~1400 counts kt = 5.17±1.0 kev Abund = 0.64±0.4 solar f 0.3 8keV = 6.15 x 10 13 erg s 1 cm 2 L 0.3 8keV = 1.47 x 10 44 erg s 1 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 15
L x T x Rela6on for Clusters/Groups SDSS J1200 Miller et al. 2011 Miller et al. 2011 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 16
Extended X ray Emission 11663 kt = 4.6 kev log (L x ) = 44.2 11664 kt = 5.2 kev log (L x ) = 44.3 11666 kt = 8.7 kev log (L x ) = 44.5 point source: cnts = 60; Γ =2.2 log (L x ) = 42.8 11667 kt = 1.4 kev log (L x ) = 43.3 11668 kt = 6.2 kev log (L x ) = 44.0 XBONGS, Fall 2011 17
L x T x Rela6on for Clusters/Groups Miller et al. 2011 Miller et al. 2011 XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 18
Marginal Detec6ons 11661 11662 11665 RIAF or X ray Variability possible. Host dilu6on unlikely. XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 19
Summary 8 low z (< 0.37) XBONGs observed with Chandra: 4 to 5 extended (!) in the X ray Radial profiles and X ray spectra consistent with (fossil) group or X ray cluster interpreta6on 2 to 3 show no strong X ray emission X ray variability? (possible 6dal disrup6on events) Promising new selec6on technique for op6cally poor, low z groups/clusters Follow up: Spectroscopic confirma6on of group/cluster environment High quality (XMM/Astro H) spectra to constrain T x XBONGS, Fall 2011 Daryl Haggard, Northwestern/CIERA 20