New NGC 6440 transient declining rapidly

Details New NGC 6440 transient declining rapidly New NGC 6440 transient declining rapidly

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2143....1h&link_type=abstract

The Astronomer's Telegram, #2143

Astronomy and Astrophysics

Astronomy

5

X-Ray, Request For Observations, Binaries, Globular Clusters, Neutron Stars, Transients

Scientific paper

The new transient LMXB in NGC 6440 (CXOGlb J174852.7-202124; Atel #2139) is declining rapidly. RXTE observed NGC 6440 on July 30 (18:47 to 19:26 TT). The PCA top-layer spectrum is well fit with an absorbed power-law of photon index 2.2+-0.1, with N_H set to 6e21 cm^-2 (as found by Chandra). The inferred 0.5-10 keV luminosity is 4e35 ergs/s, a decline by a factor of 3.5 from the Chandra observation ~2 days earlier.

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