To find and download HEASARC data in the cloud, you can use astroquery.heasarc or download our new tool, hark.
The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.
HEASoft and XSPEC are now available as conda packages. See details ....
NS Hydrogen Atmosphere model for different g
This model is now in the Xspec release and this page is superceded by the Xspec manual
The neutron star mass M and radius R determine the redshift parameter,
The values of the effective temperature and radius as measured by a distant observer ("values at infinity") are:
The normalization parameter (added automatically by XSPEC) is K=1/D^2, where D is distance to the neutron star (in pc). It can be fixed in spectral fits if the distance is known.
Please send your comments/questions (if any) to Slava Zavlin (vyacheslav.zavlin@msfc.nasa.gov) and/or George Pavlov (pavlov@astro.psu.edu). If you publish results obtained using this model please reference Zavlin et al. (1996, A&A 315, 141).
The model parameters are :
par1 | = | logTeff, (unredshifted) effective temperature | |||
par2 | = | Mns, neutron star gravitational mass (in units of solar mass) | |||
par3 | = | Rns, "true" neutron star radius (in km) | |||
K | = | 1/D2, where D is the distance to the object in pc |
The source code, lmodel.dat entries and nsa_gm0.0, nsa_gm0.5, nsa_gm1.0, nsa_gp0.5, nsa_gp1.0, model data files are available. The model data files should either be placed in the $XANADU/spectral/xspec/manager (V11), $XANADU/spectral/modelIonData (V12) directory or the XSPEC command xset NSAGRAV_DIR directory-path used to define the directory containing the model data files.