Following the Decay of NGC 6440 X-2

Details Following the Decay of NGC 6440 X-2 Following the Decay of NGC 6440 X-2

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2926h&link_type=abstract

Chandra proposal ID #10408327

Physics

Scientific paper

On July 28-29, our GO Chandra image of NGC 6440 discovered a 2nd transient LMXB in outburst in the globular cluster NGC 6440 (Atel 2139). RXTE/PCA saw indications of flaring at 0.7 Hz, similar to 1 Hz flaring from SAX J1808, which indicated propeller instabilities in the flow (Patruno+09). We request one 5-ksec ACIS-S observation of NGC 6440 by August 14 to determine whether this transient has returned to full quiescence (<1e31) or undergoes accretion instabilities at low (Lx~5e32) levels, as SAX J1808 did (Campana+08). 5 ksec will give >10 cts for Lx(0.5-10)>3e32 ergs/s (either BB @0.2 keV, or PL @index~2.2 as seen by Swift for 6440 X-2).

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