Dr Duncan Galloway - Researcher Profile

Biography

Duncan works in the School of Mathematical Sciences at Monash University as a ARC Future Fellow

Duncan’s research areas of interest are:

 

My primary area of research interest is the nature and properties of neutron star binaries. A neutron star is the extreme product of a supernova explosion; the surface density, temperature, and magnetic field strength are all many orders of magnitude in excess of anything achievable on Earth. Accreting binaries, in which gas from a relatviely normal stellar companion falls under gravity onto a neutron star, offer a unique window on some rich physics via satellite-based X-ray observations. X-ray studies of accreting neutron stars have only been possible for a few decades, and there remain many outstanding questions about the neutron star's magnetic field geometry, surface thermonuclear processes, internal structure, and the angular momentum balance. Accreting binaries can be studied using a range of techniques:
• pulse timing and phase-resolved spectroscopy
• analysis of thermonuclear (type I) bursts
• high-resolution X-ray imaging and spectroscopy
I use observational data from four of the satellite X-ray observatories currently in operation, NASA's Rossi X-ray Timing Explorer (RXTE), ESA's INTEGRAL and XMM-Newton, and the Chandra X-ray Observatory. I actively pursue new observations via the annual NASA announcements of opportunity, as well as making use of the extensive archival datasets available through the High-Energy Astrophysics Science Archive Research Center. I also perform observations of the counterparts of accreting binaries in other bands at facilities including the Australia Telescope Compact Array and the Magellan telescopes.
Rapidly-rotating neutron stars such as those found in X-ray binaries are also candidate persistent sources of gravitational waves, raising the prospect for future detection by long-baseline interferometers such as LIGO. It is expected that gravitational waves will be detected for the first time by LIGO within the next 5-10 years. With observers at MIT I collaborate on an ongoing program to detect and characterize new examples of such rapidly-rotating neutron stars, as well as working to complete the catalogue of known sources by determining their orbital periods (essential if optimal GW sensitivity is to be achieved).

personal web page: http://users.monash.edu.au/~dgallow/

Qualifications

PHD

Institution: University of Tasmainia

Year awarded: 2001

BACHELOR OF SCIENCE (HONS)

Institution: University of Tasmainia

Year awarded: 1991

Publications

Journal Articles

Zamfir, M., Cumming, A., Galloway, D.K., 2012, Constraints on neutron star mass and radius in GS 1826-24 from sub-Eddington X-ray bursts, Astrophysical Journal [P], vol 749, issue 1, Institute of Physics Publishing Inc, Philidelphia USA, pp. 1-10.

Galloway, D.K., Lampe, N., 2012, On the consistency of neutron-star radius measurements from thermonuclear bursts, Astrophysical Journal [P], vol 747, issue 1, Institute of Physics Publishing Inc, Bristol England, pp. 1-8.

Falanga, M., Kuiper, L., Poutanen, J., Galloway, D.K., bozzo, E., Goldwurm, A., Hermsem, W., Stella, L., 2012, Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17498-2921, Astronomy & Astrophysics [P], vol 545, E D P Sciences, Les Ulis France, pp. 1-9.

Hartman, J., Galloway, D., Chakrabarty, D., 2011, A double outburst from IGR J00291+5934: Implications for accretion disk instability theory, The Astrophysical Journal. Letters [P], vol 726, issue 1, Institute of Physics Publishing Ltd., UK, pp. 1-15.

Zand, J., Galloway, D., Ballantyne, D., 2011, Achromatic late-time variability in thermonuclear X-ray bursts: An accretion disk disrupted by a nova-like shell?, Astronomy & Astrophysics [P], vol 525, EDP Sciences, France, pp. A111-1-A111-7.

Chenevez, J., Altamirano, D., Galloway, D., Zand, J., Kuulkers, E., Degenaar, N., Falanga, M., Del Monte, E., Evangelista, Y., Feroci, M., Costa, E., 2011, Puzzling thermonuclear burst behaviour from the transient low-mass X-ray binary IGR J17473-2721, Monthly Notices Of The Royal Astronomical Society [P], vol 410, issue 1, Wiley-Blackwell Publishing Ltd., UK, pp. 179-189.

Falanga, M., Kuiper, L., Poutanen, J., Galloway, D., Bonning, E., bozzo, E., Goldwurm, A., Hermsen, W., Stella, L., 2011, Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17511-3057, Astronomy & Astrophysics [P], vol 529, issue 1, E D P Sciences, France, pp. 1-11.

Barriga, P., Blair, D., Coward, D., Davidson, J., Dumas, J., Howell, E., Ju, l., Wen, L., Zhao, C., McClelland, D., Scott, S., Slagmolen, B., Inta, R., Munch, J., Ottaway, D., Veitch, P., Hosken, D., Melatos, A., Chung, C., Sammut, L., Galloway, D., Marx, J., Whitcomb, S., Shoemaker, D., Hughes, S., Reitze, D., Iyer, B., Dhurandhar, S., Souradeep, T., Unnikrishnan, C., Rajalakshmi, G., Man, C., Heidmann, A., Cohadon, P., Briant, T., Grote, H., Danzmann, K., Luck, H., Wilke, B., Strain, K., Sathyaprakash, B., Cao, J., Cheung, Y., Zhang, Y., 2010, AIGO: A southern hemisphere detector for the worldwide array of ground-based interferometric gravitational wave detectors, Classical and Quantum Gravity [P], vol 27, issue 8, IOP Publishing Ltd, Bristol England, pp. 1-12.

Galloway, D.K., Lin, J., Chakrabarty, D., Hartman, J., 2010, Discovery of a 552 Hz burst oscillation in the low-mass x-ray binary EXO 0748-676, The Astrophysical Journal. Letters [P], vol 711, issue 2, IOP Publishing, Bristol England, pp. L148-L151.

Misanovic, Z., Galloway, D.K., Cooper, R.L., 2010, Ignition column depths of helium-rich thermonuclear bursts from 4U 1728-34, Astrophysical Journal [P], vol 718, issue 2, IOP Publishing Ltd, Bristol England, pp. 947-956.

Keek, L., Galloway, D.K., Zand, J.J.M., Heger, A., 2010, Multi-instrument x-ray observations of thermonuclear bursts with short recurrence times, Astrophysical Journal [P], vol 718, issue 12, IOP Publishing Ltd, Bristol England, pp. 292-305.

Galloway, D., Yao, Y., Marshall, H., Misanovic, Z., Weinberg, N., 2010, Radius-expansion burst spectra from 4U 1728-34: An ultracompact binary?, Astrophysical Journal [P], vol 724, issue 1, Institute of Physics Publishing, USA, pp. 417-424.

Bhattacharyya, S., Coleman Miller, M., Galloway, D., 2010, Systematic variation in the apparent burning area of thermonuclear bursts and its implication for neutron star radius measurement, Monthly Notices Of The Royal Astronomical Society [P], vol 401, Wiley-Blackwell Publishing Ltd, Edinburgh UK, pp. 2-6.

Galloway, D.K., Ozel, F., Psaltis, D., 2008, Biases for neutron star mass, radius and distance measurements from Eddington-limited x-ray bursts, Monthly Notices of the Royal Astronomical Society, vol 387, Wiley-Blackwell, UK, pp. 268-272.

McNamara, A., Kuncic, Z., Wu, K., Galloway, D.K., Cullen, J., 2008, Compton scattering of Fe Kalpha lines in magnetic cataclysmic variables, Monthly Notices of the Royal Astronomical Society, vol 383, Wiley-Blackwell, UK, pp. 962-970.

Thompson, T., Galloway, D.K., Rothschild, R., Homer, L., 2008, Deviations from the flux-recurrence time relationship in GS 1826-238: potential transient spectral changes, The Astrophysical Journal, vol 681, Institute of Physics Publishing, USA, pp. 506-514.

Chung, C., Galloway, D.K., Melatos, A., 2008, Does the accreting millisecond pulsar XTE J1814-338 precess?, Monthly Notices of the Royal Astronomical Society, vol 391, Wiley-Blackwell, UK, pp. 254-267.

Schulz, N.S., Kallman, T., Galloway, D.K., Brandt, W., 2008, The variable warm absorber in circinus X-1, The Astrophysical Journal, vol 672, Institute of Physics Publishing, USA, pp. 1091-1102.

Galloway, D.K., Muno, M.P., Hartman, J., Psaltis, D., Chakrabarty, D., 2008, Thermonuclear (Type I) x-ray bursts observed by the Rossi x-ray timing explorer, The Astrophysical Journal, vol 179, Institute of Physics Publishing, USA, pp. 360-422.

Krimm, H., Markwardt, C., Deloye, C., Romano, P., Chakrabarty, D., Campana, S., Cummings, J., Galloway, D.K., Gehrels, N., Hartman, J., Kaaret, P., Morgan, E.H., Tueller, J., 2007, Discovery of the accretion-powered millisecond pulsar swift j1756.9-2508 with a low-mass companion, The Astrophysical Journal, vol 668, Institute of Physics Publishing, USA, pp. L147-L150.

Heinz, S., Schulz, N.S., Brandt, W., Galloway, D.K., 2007, Evidence of a parsec-scale x-ray jet from the accreting neutron star circinus X-1, The Astrophysical Journal, vol 663, Institute of Physics Publishing, USA, pp. L93-L96.

Galloway, D.K., Morgan, E.H., Krauss, M., Kaaret, P., Chakrabarty, D., 2007, Intermittent pulsations in an accretion-powered millisecond pulsar, The Astrophysical Journal, vol 654, Institute of Physics Publishing, USA, pp. L73-L76.

Heger, A., Cumming, A., Galloway, D.K., Woosley, S.E., 2007, Models of Type I X-Ray Bursts from GS 1826-24: A Probe of rp-Process Hydrogen Burning, The Astrophysical Journal, vol 671, issue 2, University of Chicago Press, Chicago USA, pp. 141-144.

Galloway, D.K., Psaltis, D., Muno, M.P., Chakrabarty, D., 2006, Eddington-limited X-ray bursts as distance indicators. II. Possible compositional effects in bursts from 4U 1636-536, The Astrophysical Journal, vol 639, Institute of Physics Publishing, USA, pp. 1033-1038.

Galloway, D.K., Cumming, A., 2006, Helium-rich thermonuclear bursts and the distance to the accretion-powered millisecond pulsar SAX J1808.4-3658, The Astrophysical Journal, vol 652, Institute of Physics Publishing, USA, pp. 559-568.

Jonker, P., Campana, S., Steeghs, D., Torres, M., Galloway, D.K., Markwardt, C., Chakrabarty, D., Swank, J., 2005, Chandra observations of the millisecond X-ray pulsar IGR J00291+5934 in quiescence, Monthly Notices of the Royal Astronomical Society, vol 361, Wiley-Blackwell, UK, pp. 511-516.

Tiengo, A., Galloway, D.K., di Salvo, T., Mendez, M., Miller, J., Sokoloski, J., Van der Klis, M., 2005, Discovery of a redshifted X-ray emission line in the symbiotic neutron star binary 4U 1700+24, Astronomy & Astrophysics, vol 441, EDP Sciences, France, pp. 283-287.

Galloway, D.K., Wang, Z., Morgan, E.H., 2005, Discovery of pulsations in the X-ray transient 4U 1901+03, The Astrophysical Journal, vol 635, Institute of Physics Publishing, USA, pp. 1217-1223.

Galloway, D.K., Markwardt, C., Morgan, E.H., Chakrabarty, D., Strohmayer, T., 2005, Discovery of the accretion-powered millisecond X-ray pulsar IGR J00291+5934, The Astrophysical Journal, vol 622, Institute of Physics Publishing, USA, pp. L45-L48.

Galloway, D.K., Morgan, E.H., Levine, A., 2004, A frequency glitch in an accreting pulsar, The Astrophysical Journal, vol 613, Institute of Physics Publishing, USA, pp. 1164-1172.

Galloway, D.K., Sokoloski, J., 2004, An x-ray jet from a white dwarf: Detection of the collimated outflow from Ch CYGNI with CHANDRA, The Astrophysical Journal, vol 613, Institute of Physics Publishing, USA, pp. L61-L64.

Jonker, P., Galloway, D.K., McClintock, J., Buxton, M., Garcia, M., Murray, S.S., 2004, Optical and x-ray observations of the neutron star soft x-ray transient XTE J1709-267, Monthly Notices of the Royal Astronomical Society, vol 354, Wiley-Blackwell Publishing, UK, pp. 666-674.

Galloway, D.K., Cumming, A., Kuulkers, E., Bildsten, L., Chakrabarty, D., Rothschild, R., 2004, Periodic thermonuclear x-ray bursts from GS 1826-24 and the fuel composition as a function of accretion rate, The Astrophysical Journal, vol 601, Institute of Physics Publishing, USA, pp. 466-473.

Muno, M.P., Galloway, D.K., Chakrabarty, D., 2004, The effect of neutron star rotation on the properties of thermonuclear x-rays bursts, The Astrophysical Journal, vol 608, Institute of Physics Publishing, USA, pp. 930-934.

Galloway, D.K., Psaltis, D., Chakrabarty, D., Muno, M.P., 2003, Eddington-limited X-ray bursts as distance indicators. I. Systematic trends and spherical symmetry in bursts from 4U 1728-34, The Astrophysical Journal, vol 590, Institute of Physics Publishing, USA, pp. 999-1007.

Chakrabarty, D., Morgan, E.H., Muno, M.P., Galloway, D.K., Wijnands, R., Van der Klis, M., Markwood, C.B., 2003, Nuclear-powered millisecond pulsars and the maximum spin frequency of neutron stars, Nature, vol 424, Nature Publishing Group, UK, pp. 42-44.

Lazendic-Galloway, J., Slane, P., Gaensler, B.M., Plucinsky, P.P., Hughes, J.P., Galloway, D.K., Crawford, F., 2003, X-ray observations of the compact central object in supernova remnant G347.3-0.5, The Astrophysical Journal, vol 593, Institute of Physics Publishing, USA, pp. L27-L30.

Juett, A.M., Galloway, D.K., Chakrabarty, D., 2003, X-ray spectroscopy of the accreting millisecond pulsar XTE J0929-314 in outburst, The Astrophysical Journal, vol 587, Institute of Physics Publishing, USA, pp. 754-760.

Galloway, D.K., Sokoloski, J., Kenyan, S., 2002, Correlated radial velocity and x-ray variation in HD 154791/4U 1700+24, The Astrophysical Journal, vol 580, Institute of Physics Publishing, USA, pp. 1065-1069.

Galloway, D.K., Chakrabarty, D., Morgan, E.H., Remillard, R., 2002, Discovery of a high-latitude accreting millisecond pulsar in an ultracompact binary, The Astrophysical Journal, vol 576, Institute of Physics Publishing, USA, pp. L137-L140.

Wijnands, R., Muno, M.P., Miller, J., Franco, L., Strohmayer, T., Galloway, D.K., Chakrabarty, D., 2002, The burst behavior of the eclipsing low-mass x-ray binary MXB 1659-298, The Astrophysical Journal, vol 566, Institute of Physics Publishing, USA, pp. 1060-1068.

Muno, M.P., Chakrabarty, D., Galloway, D.K., 2002, The frequency stability of millisecond oscillations in thermonuclear x-ray bursts, The Astrophysical Journal, vol 580, Institute of Physics Publishing, USA, pp. 1048-1059.

Conference Proceedings

Galloway, D., 2008, Accreting neutron star spins and the equation of state, 40 years of Pulsars: Millisecond Pulsars, Magnetars and More, 12 August 2007 to 17 August 2007, American Institute of Physics, USA, pp. 510-518.

Blair, D.G., Barriga, P., Brooks, A., Charlton, P., Coward, D., Dumas, J.C., Fan, Y., Galloway, D.K., Gras, S., Hosken, D., Howell, E., Hughes, S., Ju, L., McClelland, D.E., Melatos, A., Miao, H., Munch, J., Scott, S.M., Slagmolen, B.J., Veitch, P., Wen, L., Webb, J., Woolley, A., Yan, Z., Zhao, C., 2008, The science benefits and preliminary design of the southern hemisphere gravitational wave detector AIGO, 7th Edoardo Amaldi Conference on Gravitational Waves (Amaldi7), 8 July 2008 to 14 July 2008, Institute of Physics Publishing, Australia, pp. 012001-1-012001-6.

Postgraduate Research Supervisions

Current Supervision

Program of Study:

(DOCTORATE BY RESEARCH).

Thesis Title:

Expanding atmospheres in burning neutron stars.

Supervisors:

Galloway, D (Joint-co), Price, D (Joint).

Program of Study:

(DOCTORATE BY RESEARCH).

Thesis Title:

Precision ephemerides of neutron star binaries to assist gravitational wave searches.

Supervisors:

Galloway, D (Main), Levin, Y (Associate).

Completed Supervision

Student:

Hanson, L.

Program of Study:

Ultra high energy cosmic rays from active galactic nuclei. 2012.

Supervisors:

Donea, A (Main), Galloway, D (Associate).