1370001
收藏DataCite Commons2025-03-14 更新2025-04-15 收录
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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 and 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 sp [truncated! Please see actual data for full text]
提供机构:
European Space Agency
创建时间:
2025-03-14



