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A Broad Iron Line in the Chandra/HETG Spectrum of 4U 1705-44

Published online by Cambridge University Press:  22 February 2018

T. Di Salvo ,
R. Iaria ,
M. Méndez ,
L. Burderi ,
N. R. Robba ,
L. Stella  and
M. van der Klis
T. Di Salvo
Affiliation:
Astronomical Institute “Anton Pannekoek, ” , University of Amsterdam and Center for High-Energy Astrophysics, Kruislaan 403, NL 1098 SJ Amsterdam, the Netherlands
R. Iaria
Affiliation:
Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Italy
M. Méndez
Affiliation:
National Institute for Space Research, SRON, Utrecht, the Netherlands
L. Burderi
Affiliation:
Osservatorio Astronomico di Roma, Italy
N. R. Robba
Affiliation:
Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Italy
L. Stella
Affiliation:
Osservatorio Astronomico di Roma, Italy
M. van der Klis
Affiliation:
Astronomical Institute “Anton Pannekoek, ” , University of Amsterdam and Center for High-Energy Astrophysics, Kruislaan 403, NL 1098 SJ Amsterdam, the Netherlands

Extract

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We present preliminary results from a Chandra 30 ks observation of the atoll sourco 4U 1705 44. In particular we concentrate on the study of the iron Kα line, using the HEG spectrometer. The iron Kα line at ~ 6.6 keV is found to be intrinsically broad (FWHM ~ 1.7 keV); its width can be explained by reflection from a cold accretion disk extending down to ~ 17 km from the neutron star center or by Compton broadening in the hotter (~ 3 – 4 keV) corona.

Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 218
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

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