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Browsing MIT Open Access Articles by Title

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  • Jeltema, Tesla E.; Canizares, Claude R.; Garmire, Gordon P.; Buote, David A. (IOP Publishing, 2002-09)
    We present an analysis of a Chandra ACIS-S observation of the elliptical galaxy NGC 720, to verify the existence of a dark matter halo and to measure its ellipticity. The ACIS-S3 image reveals over 60 point sources distributed ...
  • Gammie, C.; Dexter, J.; Markoff, S.; Haggard, D.; Nayakshin, S.; Wang, Q. D.; Grosso, N.; Porquet, D.; Tomsick, J. A.; Degenaar, N.; Fragile, P. C.; Wijnands, R.; Miller, J. M.; Baganoff, Frederick K.; Neilsen, Joey; Nowak, Michael A.; Houck, John C. (IOP Publishing, 2013-08)
    We present the first systematic analysis of the X-ray variability of Sgr A* during the Chandra X-ray Observatory's 2012 Sgr A* X-ray Visionary Project. With 38 High Energy Transmission Grating Spectrometer observations ...
  • Markoff, S. B.; Porquet, D.; Grosso, N.; Levin, Y.; Eckart, A.; Falcke, Heino; Ji, L.; Miller, J. M.; Wang, Q. D.; Nowak, Michael A.; Neilsen, Joey; Baganoff, Frederick K.; Houck, John C. (IOP Publishing, 2012-10)
    Starting in 2012, we began an unprecedented observational program focused on the supermassive black hole in the center of our Galaxy, Sgr A*, utilizing the High Energy Transmission Grating Spectrometer (HETGS) instrument ...
  • Murphy, K. D.; Nowak, Michael A. (IOP Publishing, 2014-11)
    We present a spectral analysis of the 118 ks Chandra High Energy Transmission Gratings (HETG) observation of the X-ray bright Seyfert 1.5 galaxy MCG +8-11-11, in conjunction with 100 ks of archival Suzaku data, aimed at ...
  • Canizares, Claude R.; Davis, John E.; Dewey, Dan; Flanagan, Kathryn A.; Galton, Eugene B.; Huenemoerder, David P.; Ishibashi, Kazunori; Markert, Thomas H.; Marshall, Herman Lee; McGuirk, Michael; Schattenburg, Mark Lee; Schulz, Norbert S.; Smith, Henry Ignatius; Wise, Michael (University of Chicago Press, The, 2005-09)
    Details of the design, fabrication, and ground and flight calibration of the High Energy Transmission Grating (HETG) on the Chandra X‐Ray Observatory are presented after 5 years of flight experience. Specifics include the ...
  • Trichas, Markos; Green, Paul J.; Silverman, John D.; Aldcroft, Tom; Barkhouse, Wayne; Cameron, Robert A.; Constantin, Anca; Ellison, Sara L.; Foltz, Craig; Haggard, D.; Jannuzi, Buell T.; Kim, Dong-Woo; Marshall, Herman Lee; Mossman, Amy; Pérez, Laura M.; Romero-Colmenero, Encarni; Ruiz, Angel; Smith, Malcolm G.; Smith, Paul S.; Torres, Guillermo; Wik, Daniel R.; Wilkes, Belinda J.; Wolfgang, Angie (Institute of Physics/American Astronomical Society, 2012-06)
    From optical spectroscopy of X-ray sources observed as part of the Chandra Multi-wavelength Project (ChaMP), we present redshifts and classifications for a total of 1569 Chandra sources from our targeted spectroscopic ...
  • Lal, D. V.; Kraft, Ralph P.; Forman, W. R.; Hardcastle, M. J.; Jones, C.; Nulsen, P. E. J.; Croston, J. H.; Lee, J. C.; Evans, Daniel A. (IOP Publishing, 2010-10)
    We present results from a 42 ks Chandra/ACIS-S observation of the transitional FR I/FR II radio galaxy 3C 288 at z = 0.246. We detect ~3 keV gas extending to a radius of ~0.5 Mpc with a 0.5-2.0 keV luminosity of 6.6 × ...
  • Paizis, A.; Rodriguez, J.; Wilms, J.; Chaty, S.; Del Santo, M.; Ubertini, P.; Nowak, Michael A. (IOP Publishing, 2012-07)
    IGR J17511–3057 is a low-mass X-ray binary hosting a neutron star and is one of the few accreting millisecond X-ray pulsars with X-ray bursts. We report on a 20 ks Chandra grating observation of IGR J17511–3057, performed ...
  • Helder, E. A.; Broos, P. S.; Dewey, Dan; Dwek, E.; McCray, R.; Park, S.; Racusin, J. L.; Zhekov, S. A.; Burrows, David N. (Institute of Physics/American Astronomical Society, 2013-02)
    We report on the present stage of SN 1987A as observed by the Chandra X-Ray Observatory. We reanalyze published Chandra observations and add three more epochs of Chandra data to get a consistent picture of the evolution ...
  • Davis, John E.; Houck, John C.; Nowak, Michael A. (IOP Publishing, 2010-07)
    The Chandra Source Catalog (CSC) is a general purpose virtual X-ray astrophysics facility that provides access to a carefully selected set of generally useful quantities for individual X-ray sources, and is designed to ...
  • Kallman, T. R.; Schulz, Norbert S.; Nowak, Michael A.; Torrejon, J. M. (IOP Publishing, 2010-05)
    Fe K line fluorescence is commonly observed in the X-ray spectra of many X-ray binaries (XRBs) and represents a fundamental tool to investigate the material surrounding the X-ray source. In this paper, we present a ...
  • Nichols, Joy S.; Henden, Arne A.; Huenemoerder, David P.; Lauer, Jennifer L.; Martin, Eric; Morgan, Douglas L.; Sundheim, Beth A. (IOP Publishing, 2010-06)
    Variable stars have been identified among the optical-wavelength light curves of guide stars used for pointing control of the Chandra X-ray Observatory. We present a catalog of these variable stars along with their light ...
  • Castro, Daniel; Lopez, Laura A.; Slane, Patrick O.; Yamaguchi, Hiroya; Ramirez-Ruiz, Enrico; Figueroa-Feliciano, Enectali (Institute of Physics Publishing, 2013-12)
    The shocks of supernova remnants are believed to accelerate particles to cosmic ray (CR) energies. The amplification of the magnetic field due to CRs propagating in the shock region is expected to have an impact on both ...
  • Humphrey, Philip J.; Buote, David A.; Canizares, Claude R. (IOP Publishing, 2004)
    Using a new Chandra ACIS-S3 observation of the normal, isolated, moderate-L[subscript X] lenticular galaxy NGC 1332, we resolve the emission into ~75 point sources and a significant diffuse component. We present a detailed ...
  • Chakrabarty, Deepto; Jonker, P. G.; Torres, Manuel A. P.; Steeghs, Danny (Oxford University Press, 2012-12)
    We report on Chandra X-ray and Gemini-North near-infrared K-band observations of the eclipsing accretion-powered millisecond X-ray pulsar SWIFT J1749.4−2807 in quiescence. Using the Chandra observation we derive a source ...
  • Jeltema, Tesla E.; Canizares, Claude R.; Bautz, Mark W.; Malm, Michael R.; Donahue, Megan; Garmire, Gordon P. (IOP Publishing, 2001-11)
    We observed MS 1054-0321, the highest redshift cluster of galaxies in the Einstein Medium Sensitivity Survey (EMSS), with the Chandra ACIS-S detector. We find the X-ray temperature of the cluster to be 10.4 [+1.7 over -1.5] ...
  • Hanke, Manfred; Wilms, Jörn; Nowak, Michael A.; Pottschmidt, Katja; Schulz, Norbert S.; Lee, Julia C. (IOP Publishing, 2008-12)
    We present analyses of a 50 ks observation of the supergiant X-ray binary system Cygnus X-1 (Cyg X-1)/HDE226868 taken with the Chandra High Energy Transmission Grating Spectrometer (HETGS). Cyg X-1 was in its spectrally ...
  • Piles, Maria; Camps, Adriano; Entekhabi, Dara (Institute of Electrical and Electronics Engineers, 2009-11)
    A change detection algorithm has been developed in order to obtain high-resolution soil moisture estimates from future Soil Moisture Active and Passive (SMAP) L-band radar and radiometer observations. The approach combines ...
  • Oloritun, Rahman O.; Ouarda, Taha B. M. J.; Moturu, Sai; Madan, Anmol; Khayal, Inas; Pentland, Alex Paul (Public Library of Science, 2013-11)
    Research has mostly focused on obesity and not on processes of BMI change more generally, although these may be key factors that lead to obesity. Studies have suggested that obesity is affected by social ties. However these ...
  • Cackett, E. M.; Brown, E. F.; Cumming, A.; Degenaar, N.; Fridriksson, Joel K.; Miller, J. M.; Wijnands, R.; Homan, Jeroen (IOP Publishing, 2013-08)
    The quasi-persistent neutron star low-mass X-ray binary MXB 1659–29 went into quiescence in 2001, and we have followed its quiescent X-ray evolution since. Observations over the first 4 yr showed a rapid drop in flux and ...
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