The cold neutron star in the long-duration transient AX J1754.2-2754

Details The cold neutron star in the long-duration transient AX J1754.2-2754 The cold neutron star in the long-duration transient AX J1754.2-2754

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2517k&link_type=abstract

Chandra proposal ID #09408302

Computer Science

Scientific paper

As written in Atel#1575, J1754j went to quiescence after a long outburst. The source is an ultra-compact X-ray binary. The long outburst duration and ultra-compact nature make this source resemble H1905+000. The current Chandra non-detection, based on a 2 ks-long observation, shows that J1754 is very faint already given that the long outburst duration facilitates a high neutron star crust temperature. The low flux and the relatively high N_H forego triggering the Wijnands et al. ToO (which is based on measuring neutron star X-ray spectra). Instead, we propose to obtain one 30 ks observation to search for J1754 in quiescence. In 30 ks we would reach a flux limit of ~5E-15 erg cm-2 s-1, yielding a luminosity limit of 5E31 erg/s. A non-detection would make J1754 the second UCXB to be very cold (after H1905) suggesting that the UC nature and hence the composition of the accreted material is important for setting the NS temperature and or the cooling rate.

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