Chandra Observations of NuSTAR Serendipitous Sources near the Galactic Plane
arXiv:1811.05492 · doi:10.3847/1538-4357/aaf007
Abstract
The NuSTAR serendipitous survey has already uncovered a large number of Active Galactic Nuclei (AGN), providing new information about the composition of the Cosmic X-ray Background. For the AGN off the Galactic plane, it has been possible to use the existing X-ray archival data to improve source localizations, identify optical counterparts, and classify the AGN with optical spectroscopy. However, near the Galactic Plane, better X-ray positions are necessary to achieve optical or near-IR identifications due to the higher levels of source crowding. Thus, we have used observations with the Chandra X-ray Observatory to obtain the best possible X-ray positions. With eight observations, we have obtained coverage for 19 NuSTAR serendips within 12 deg of the plane. One or two Chandra sources are detected within the error circle of 15 of the serendips, and we report on these sources and search for optical counterparts. For one source (NuSTAR J202421+3350.9), we obtained a new optical spectrum and detected the presence of hydrogen emission lines. The source is Galactic, and we argue that it is likely a Cataclysmic Variable. For the other sources, the Chandra positions will enable future classifications in order to place limits on faint Galactic populations, including high-mass X-ray binaries and magnetars.
arXiv comment16 pages, accepted by ApJ
References in corpus (13)
- The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
- The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
- The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
- A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data
- The IBIS soft gamma-ray sky after 1000 INTEGRAL orbits
- The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN
- Population of persistent high mass X-ray binaries in the Milky Way
- The NuSTAR Serendipitous Survey: The 40 month Catalog and the Properties of the Distant High Energy X-ray Source Population
- A FWHM-K2 correlation in Black-Hole transients
- A Joint Chandra and Swift View of the 2015 X-Ray Dust Scattering Echo of V404 Cygni
- NuSTAR discovery of an unusually steady long-term spin-up of the Be binary 2RXP J130159.6-635806
- Galactic Sources Detected in the NuSTAR Serendipitous Survey
- The Chandra X-Ray Observatory: Five Years of Operation