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Date and Time of the Query: 2019-03-18 T22:36:31 PDT
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For refcode 2012ApJ...747...57M:
Retrieve 103 NED objects in this reference.
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2012ApJ...747...57M AMUSE-Field I: Nuclear X-Ray Properties of Local Field and Group Spheroids across the Stellar Mass Scale Miller, Brendan; Gallo, Elena; Treu, Tommaso; Woo, Jong-Hak Abstract. We present the first results from AMUSE-Field, a Chandra survey designed to characterize the occurrence and intensity of low-level accretion onto supermassive black holes (SMBHs) at the center of local early-type field galaxies. This is accomplished by means of a Large Program targeting a distance-limited (<30 Mpc) sample of 103 early types spanning a wide range in stellar masses. We acquired new ACIS-S observations for 61 objects down to a limiting (0.3-10 keV) luminosity of 2.5 x 10^38^ erg s^-1^, and we include an additional 42 objects with archival (typically deeper) coverage. A nuclear X-ray source is detected in 52 out of the 103 galaxies. After accounting for potential contamination from low-mass X-ray binaries, we estimate that the fraction of accreting SMBHs within the sample is 45% +/- 7%, which sets a firm lower limit on the occupation fraction within the field. The measured nuclear X-ray luminosities are invariably highly sub-Eddington, with L_X_/L_Edd_ ratios between ~10^-4^ and 10^-8^. As also found in a companion survey targeting Virgo early types, the active fraction increases with increasing host galaxy stellar mass, reflective of "Eddington incompleteness" within the lower-mass objects. For the Field sample, the average nuclear X-ray luminosity scales with the host stellar mass as M ^0.71 +/- 0.10^_star_, with an intrinsic scatter of 0.73 +/- 0.09 dex. Qualitatively similar results hold for morphologically homogeneous (type E) or uniform sensitivity (new observations only) subsets. A majority of the AMUSE-Field galaxies (78%) inhabit groups, enabling us to investigate the influence of group richness on nuclear activity. We see no evidence for a positive correlation between nuclear X-ray luminosity, normalized to host properties, and galaxy density. Rather, while the scatter is substantial, it appears that the Eddington-scaled X-ray luminosity of group members may be slightly lower than for isolated galaxies, and that this trend continues to cluster early types. Key words: black hole physics, galaxies: nuclei
Retrieve 103 NED objects in this reference.
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