M. Matranga - Department of Physics and Astronomy, Queen's University Belfast

M. Matranga
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M. Matranga
Department of Physics and Astronomy, Queen's University Belfast
United Kingdom

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High Energy Astrophysical Phenomena (10)
Solar and Stellar Astrophysics (2)
Astrophysics (2)
Nonlinear Sciences - Pattern Formation and Solitons (1)
Earth and Planetary Astrophysics (1)

Publications Authored By M. Matranga

Affiliations: 1Università degli Studi di Palermo, Palermo, Italy, 2INAF, Osservatorio Astronomico di Roma, Monte Porzio Catone, 3Università degli Studi di Palermo, Palermo, Italy, 4ISDC Data Centre for Astrophysics, Versoix, Switzerland, 5Institut de Ciencies de l'Espai, 6Università degli Studi di Palermo, Palermo, Italy, 7Università degli Studi di Cagliari, Dipartimento di Fisica, Monserrato, Italy, 8Institut de Ciencies de l'Espai, 9Osservatorio Astronomico di Capodimonte, Napoli, Italy, 10ESA/ESAC, Science Operations Department Villanueva de la Canada Madrid, Spain, 11Università degli Studi di Palermo, Palermo, Italy, 12ISDC Data Centre for Astrophysics, Versoix, Switzerland, 13INAF, Osservatorio Astronomico di Roma, Monte Porzio Catone

CONTEXT - Transient low-mass X-ray binaries (LMXBs) often show outbursts lasting typically a few-weeks and characterized by a high X-ray luminosity ($L_{x} \approx 10^{36}-10^{38}$ erg/sec), while for most of the time they are found in X-ray quiescence ($L_X\approx10^{31} -10^{33}$ erg/sec). EXO 1745-248 is one of them. AIMS - The broad-band coverage, and the sensitivity of instrument on board of {\xmm} and {\igr}, offers the opportunity to characterize the hard X-ray spectrum during {\exo} outburst. Read More

MXB 1659-298 is a transient neutron star Low-Mass X-ray binary system that shows eclipses in the light curve with a peiodicity of 7.1 hr. MXB 1659-298 on outburst in August 2015 after 14 years of quiescence. Read More

Affiliations: 1Università di Palermo, 2Università di Palermo, 3Università di Palermo, 4Università di Palermo, 5, Università di Cagliari, 6, Università di Cagliari, 7, Università di Cagliari

Context: Ser X-1 is a well studied LMXB which clearly shows a broad iron line. Recently, Miller et al. (2103) have presented broad-band, high quality NuSTAR data of SerX-1. Read More

The source 4U 1702-429 (Ara X-1) is a low-mass X-ray binary system hosting a neutron star. Albeit the source is quite bright ( $\sim10^{37}$ erg s$^{-1}$) its broadband spectrum has never been studied. Neither dips nor eclipses have been observed in the light curve suggesting that its inclination angle is smaller than 60$^{\circ}$. Read More

We report on the timing analysis of the 2015 outburst of the intermittent accreting millisecond X-ray pulsar SAX J1748.9-2021 observed on March 4 by the X-ray satellite XMM-Newton. By phase-connecting the time of arrivals of the observed pulses, we derived the best-fit orbital solution for the 2015 outburst. Read More

4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) hrs and a distance from the source that is lower than 11 kpc has been proposed. Read More

The ultra-compact dipping source \object{XB 1916-053} has an orbital period of close to 50 min and a companion star with a very low mass (less than 0.1 M$_{\odot}$). The orbital period derivative of the source was estimated to be $1. Read More

We analyse all available X-ray observations of X1822-371 made with XMM-Newton, Chandra, Suzaku and INTEGRAL satellites. The observations were not simultaneous. The Suzaku and INTEGRAL broad band energy coverage allows us to constrain the spectral shape of the continuum emission well. Read More

The bursting pulsar, GRO J1744-28, went again in outburst after $\sim$18 years of quiescence in mid-January 2014. We studied the broad-band, persistent, X-ray spectrum using X-ray data from a XMM-Newton observation, performed almost at the peak of the outburst, and from a close INTEGRAL observation, performed 3 days later, thus covering the 1.3-70. Read More

Iron emission lines at 6.4-6.97 keV, identified with Kalpha radiative transitions, are among the strongest discrete features in the X-ray band. Read More

An XMM-Newton observation of the nearby "pre-cataclysmic" short-period (P_orb = 3.62 hr) binary QS Vir (EC 13471-1258) revealed regular narrow X-ray eclipses when the white dwarf passed behind its M2-4 dwarf companion. The X-ray emission provides a clear signature of mass transfer and accretion onto the white dwarf. Read More

When a voltage is applied across a thin layer of cholesteric liquid crystal, fingers of cholesteric alignment can form and propagate in the layer. In computer simulation, based on experimental laboratory results, we demonstrate that these cholesteric fingers can solve selected problems of computational geometry, logic and arithmetics. We show that branching fingers approximate a planar Voronoi diagram, and non-branching fingers produce a convex subdivision of concave polygons. Read More

We present the results of a Spitzer photometric investigation into the IR excesses of close binary systems. In a sample of 10 objects, excesses in IRAC and MIPS24 bands implying the presence of warm dust are found for 3. For 2 objects we do not find excesses reported in earlier IRAS studies. Read More

Affiliations: 1Department of Physics and Astronomy, Queen's University Belfast, 2Department of Physics and Astronomy, Queen's University Belfast, 3Mullard Space Science Laboratory, University College London, 4Department of Physics and Astronomy, Queen's University Belfast
Category: Astrophysics

X-ray spectra of the late-type star AB Dor, obtained with the XMM-Newton satellite are analysed. AB Dor was particularly active during the observations. An emission measure reconstruction technique is employed to analyse flare and quiescent spectra, with emphasis on the Fe XVII 15-17 A wavelength region. Read More