Search Publications
The XMM-Newton Wide-field Survey in the Cosmos Field (XMM-COSMOS): Demography and Multiwavelength Properties of Obscured and Unobscured Luminous Active Galactic Nuclei
Finoguenov, A.; Aussel, H.; Le Floc'h, E. +64 more
We report the final optical identifications of the medium-depth (~60 ks), contiguous (2 deg2) XMM-Newton survey of the COSMOS field. XMM-Newton has detected ~1800 X-ray sources down to limiting fluxes of ~5 × 10-16, ~3 × 10-15, and ~7 × 10-15 erg cm-2 s-1 in the 0.5-2 keV, 2-10 keV,…
The Distance, Mass, and Radius of the Neutron Star in 4U 1608-52
Güver, Tolga; Özel, Feryal; Cabrera-Lavers, Antonio +1 more
Low-mass X-ray binaries (LMXBs) that show thermonuclear bursts are ideal sources for constraining the equation of state of neutron star matter. The lack of independent distance measurements for most of these sources, however, prevent a systematic exploration of the masses and radii of the neutron stars, hence limiting the equation-of-state studies…
A Weak Lensing Study of X-ray Groups in the Cosmos Survey: Form and Evolution of the Mass-Luminosity Relation
Koekemoer, Anton M.; Elvis, Martin; Ellis, Richard S. +27 more
Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and cooling of the intracluster medium. In this paper, we use a sample of 206 X-ray-selected galaxy groups to investigate the scaling relation between X-ray …
A Spitzer-selected Galaxy Cluster at z = 1.62
Finkelstein, S. L.; Papovich, C.; McLure, R. J. +15 more
We report the discovery of a galaxy cluster at z = 1.62 located in the Spitzer Wide-Area Infrared Extragalactic survey XMM-LSS field. This structure was selected solely as an overdensity of galaxies with red Spitzer/Infrared Array Camera colors, satisfying ([3.6] - [4.5])AB> - 0.1 mag. Photometric redshifts derived from the Subaru XM…
The Constant Inner-disk Radius of LMC X-3: A Basis for Measuring Black Hole Spin
Steiner, James F.; Remillard, Ronald A.; McClintock, Jeffrey E. +3 more
The black hole binary system LMC X-3 has been observed by virtually every X-ray mission since the inception of X-ray astronomy. Among the persistent sources, LMC X-3 is uniquely both habitually soft and highly variable. Using a fully relativistic accretion disk model, we analyze hundreds of spectra collected during eight X-ray missions that span 2…
Reversal of Fortune: Confirmation of an Increasing Star Formation-Density Relation in a Cluster at z = 1.62
Papovich, Casey; Finkelstein, Steven L.; Saintonge, Amélie +9 more
We measure the rest-frame colors (dust-corrected), infrared luminosities, star formation rates, and stellar masses of 92 galaxies in a Spitzer-selected cluster at z = 1.62. By fitting spectral energy distributions (SEDs) to 10-band photometry (0.4 µm<λobs < 8 µm) and measuring 24 µm fluxes for the 12 spectroscopi…
Discovery of a Superluminal Fe K Echo at the Galactic Center: The Glorious Past of Sgr A* Preserved by Molecular Clouds
Ponti, G.; Terrier, R.; Goldwurm, A. +2 more
We present the result of a study of the X-ray emission from the galactic center (GC) molecular clouds (MCs) within 15 arcmin from Sgr A*. We use XMM-Newton data (about 1.2 Ms of observation time) spanning about eight years. The MC spectra show all the features characteristic of reflection: (1) intense Fe Kα, with equivalent width of about 0.7-1 ke…
On the Origin of the Extended Hα Filaments in Cooling Flow Clusters
Veilleux, Sylvain; Rupke, David S. N.; Mushotzky, Richard +1 more
We present a high spatial resolution Hα survey of 23 cooling flow clusters using the Maryland Magellan Tunable Filter, covering 1-2 orders of magnitude in cooling rate, dM/dt, temperature, and entropy. We find that 8/23 (35%) of our clusters have complex, filamentary morphologies at Hα, while an additional 7/23 (30%) have marginally extended or nu…
Relativistic Lines and Reflection from the Inner Accretion Disks Around Neutron Stars
Miller, Jon M.; Cackett, Edward M.; Wijnands, Rudy +6 more
A number of neutron star low-mass X-ray binaries (LMXBs) have recently been discovered to show broad, asymmetric Fe K emission lines in their X-ray spectra. These lines are generally thought to be the most prominent part of a reflection spectrum, originating in the inner part of the accretion disk where strong relativistic effects can broaden emis…
Spin-Down Measurement of PSR J1852+0040 in Kesteven 79: Central Compact Objects as Anti-Magnetars
Gotthelf, E. V.; Halpern, J. P.
Using XMM-Newton and Chandra, we achieved phase-connected timing of the 105 ms X-ray pulsar PSR J1852+0040 that provides the first measurement of the spin-down rate of a member of the class of central compact objects (CCOs) in supernova remnants. We measure \dot{P} = (8.68 ± 0.09) × 10^{-18}, and find no evidence for timing noise or variations in …