| Abstract |
TOO on MAXI J0911-655 (outise TAC)MAXI J0911-655 (aka Swift J0911.9-6452) is a new X-ray transient first detected by MAXI on February 2016 at a position compatible with the globular cluster NGC 2808 (Atel #8872, 8884). The 0.3-10 keV flux observed by Swift showed a small decrease from 2.6(2)E-10 erg/cm^2/s (on March 29) to 2.0(1)E-10 erg/cm^2/s (on April 17). A Chandra observation performed on April 9 detected the source at coordinates RA= 09:12:02.43, Dec = -64:52:06.4 (Atel #8971), consistent with that of source 15 from Servillat (2008, A&A, 490, 641), who observed the cluster with XMM-Newton when the transient was in quiescence. An ATCA radio observation of the cluster did not detect any source inside the X-ray source error circle down to a 5sigma upper limit of 70 muJy, indicating that the accretor is probably a neutron star (Atel #8914).The results of the Swift monitoring of the source can be found for the next few days at: http://www.swift.ac.uk/user_objects/tprods/USERPROD_129.194.8.73_1461141680439/index.phpThe spectrum has been extracted by using the pointing performed on April 17.Globular clusters are ideal environments to produce fast recycled ms pulsars. At present, 146 radio ms pulsars and 3 accreting ms pulsars (SAX J1748.9-2021 and NGC 6440 X-2 in NGC 6440, and IGR J18245-2452 in M28) have been detected in 28 globular clusters. The previously discovered INTEGRAL source IGR J18245-2452 (Papitto et al. 2013, Nature, 501, 515) demonstrated that swings between radio and X-ray pulsar behaviour can take place over time scales as short as a few weeks.Our group triggered today a 70 ks XMM-Newton ToO on MAXI J0911-655 in order to detect pulsations and confirm the presence of a neutron star accretor in this system. We are asking here 70 ks of simultaneous observation with INTEGRAL in order to: (i) constrain the spectral properties of the source at hard X-rays, in order to break the degeneracy among different spectral models that cannot be ... |
| Publications |
- Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808 - Sanna, A., Papitto, A.,Burderi, L.,Bozzo, E.,Riggio, A.,Di Salvo, T.,Ferrigno, C.,Rea, N.,Iaria, R. (2017-01-01) http://ui.adsabs.harvard.edu/#abs/2017A&A...598A..34S
- Extreme relativistic electron fluxes in the Earths outer radiation belt: Analysis of INTEGRAL IREM data - Meredith, Nigel P., Horne, Richard B.,Sandberg, Ingmar,Papadimitriou, Constantinos,Evans, Hugh D. R. (2017-07-01) http://ui.adsabs.harvard.edu/#abs/2017SpWea..15..917M
- Gamma-Ray Emission of 60Fe and 26Al Radioactivity in Our Galaxy - Wang, W., Siegert, T.,Dai, Z. G.,Diehl, R.,Greiner, J.,Heger, A.,Krause, M.,Lang, M.,Pleintinger, M. M. M.,Zhang, X. L. (2020-02-01) http://ui.adsabs.harvard.edu/#abs/2020ApJ...889..169W
- INTEGRAL/SPI {$gamma$}-ray line spectroscopy. Response and background characteristics - Diehl, Roland, Siegert, Thomas,Greiner, Jochen,Krause, Martin,Kretschmer, Karsten,Lang, Michael,Pleintinger, Moritz,Strong, Andrew W.,Weinberger, Christoph,Zhang, Xiaoling (2018-03-01) http://ui.adsabs.harvard.edu/#abs/2018A&A...611A..12D
- New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations - Krivonos, Roman A., Tsygankov, Sergey S.,Mereminskiy, Ilya A.,Lutovinov, Alexander A.,Sazonov, Sergey Yu.,Sunyaev, Rashid A. (2017-09-01) http://ui.adsabs.harvard.edu/#abs/2017MNRAS.470..512K
- Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4-650224 - Coti Zelati, Francesco, Papitto, Alessandro,de Martino, Domitilla,Buckley, David A. H.,Odendaal, Alida,Li, Jian,Russell, Thomas D.,Torres, Diego F.,Mazzola, Simona M.,Bozzo, Enrico,Gromadzki, Mariusz,Campana, Sergio,Rea, Nanda,Ferrigno, Carlo,Migliari, Simone (2019-02-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...622A.211C
- The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR - Perez, Kerstin, Krivonos, Roman,Wik, Daniel R. (2019-10-01) http://ui.adsabs.harvard.edu/#abs/2019ApJ...884..153P
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