The SAURON project - XVIII. The integrated UV-line-strength relations of early-type galaxies

Monthly Notices of the Royal Astronomical Society (2011)

Authors:

M Bureau, H Jeong, SK Yi, K Schawinski, RCW Houghton, RL Davies, R Bacon, M Cappellari, PT de Zeeuw, E Emsellem, J Falcón-Barroso, D Krajnović, H Kuntschner, RM Mcdermid, RF Peletier, M Sarzi, Y-J Sohn, D Thomas, RCE van den Bosch, G van de Ven

The SAURON project - XVIII. The integrated UV-line-strength relations of early-type galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414:3 (2011) 1887-1902

Authors:

Martin Bureau, Hyunjin Jeong, Sukyoung K Yi, Kevin Schawinski, Ryan CW Houghton, Roger L Davies, Roland Bacon, Michele Cappellari, P Tim de Zeeuw, Eric Emsellem, Jesus Falcon-Barroso, Davor Krajnovic, Harald Kuntschner, Richard M McDermid, Reynier F Peletier, Marc Sarzi, Young-Jong Sohn, Daniel Thomas, Remco CE van den Bosch, Glenn van de Ven

The stellar kinematics and populations of boxy bulges: cylindrical rotation and vertical gradients

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414:3 (2011) 2163-2172

Authors:

Michael J Williams, Michel A Zamojski, Martin Bureau, Harald Kuntschner, Michael R Merrifield, P Tim de Zeeuw, Konrad Kuijken

ULTRA STEEP SPECTRUM RADIO SOURCES IN THE LOCKMAN HOLE: SERVS IDENTIFICATIONS AND REDSHIFT DISTRIBUTION AT THE FAINTEST RADIO FLUXES

ASTROPHYSICAL JOURNAL 743:2 (2011) ARTN 122

Authors:

J Afonso, L Bizzocchi, E Ibar, M Grossi, C Simpson, S Chapman, MJ Jarvis, H Rottgering, RP Norris, J Dunlop, RJ Ivison, H Messias, J Pforr, M Vaccari, N Seymour, P Best, E Gonzalez-Solares, D Farrah, CAC Fernandes, J-S Huang, M Lacy, C Maraston, L Marchetti, J-C Mauduit, S Oliver, D Rigopoulou, SA Stanford, J Surace, G Zeimann

Field and globular cluster low-mass X-ray binaries in NGC 4278

Astrophysical Journal 725:2 (2010) 1824-1847

Authors:

G Fabbiano, NJ Brassington, L Lentati, L Angelini, RL Davies, J Gallagher, V Kalogera, DW Kim, AR King, A Kundu, S Pellegrini, AJ Richings, G Trinchieri, A Zezas, S Zepf

Abstract:

We report a detailed spectral analysis of the population of low-massX-ray binaries (LMXBs) detected in the elliptical galaxy NGC 4278 with Chandra. Seven luminous sources were studied individually, four in globular clusters (GCs) and three in the stellar field. The range of (0.3-8 keV) LX for these sources is ∼(3-8) × 1038 erg s-1, suggesting that they may be black hole binaries (BHBs). Fitting the data with either single thermal accretion disk or power-law (PO) models results in best-fit temperatures of ∼0.7-1.7 keV and Λ ∼ 1.2-2.0, consistent with those measured in Galactic BHBs. Comparison of our results with simulations allows us to discriminate between disk and power-lawdominated emission, pointing to spectral/luminosity variability, reminiscent of Galactic BHBs. The BH masses derived from a comparison of our spectral results with the LX ≥ T in4 relation of Galactic BHBs are in the 5-15M⊙ range, as observed in the Milky Way. The analysis of joint spectra of sources selected in three luminosity ranges (LX ≥ 1.5 × 1038 erg s-1, 6 × 1037 erg s-1 ≤ LX < 1.5 × 1038 erg s-1, and LX < 6 × 1037 erg s-1) suggests that while the high-luminosity sources have prominent thermal disk emission components, power-law components are likely to be important in the mid- and low-luminosity spectra. Comparing low-luminosity average spectra, we find a relatively larger NH in the GC spectrum; we speculate that this may point to either a metallicity effect or to intrinsic physical differences between field and GC accreting binaries. Analysis of average sample properties uncovers a previously unreported L X-RG correlation (where RG is the galactocentric radius) in the GC-LMXB sample, implying richer LMXB populations in more central GCs. No such trend is seen in the field LMXB sample. We can exclude that the GC LX-RG correlation is the by-product of a luminosity effect and suggest that it may be related to the presence of more compact GCs at smaller galactocentric radii, fostering more efficient binary formation. © 2010. The American Astronomical Society. All rights reserved.