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Project MOMO: Multiwavelength Observations and Modeling of OJ 287

Ciprini, S.; Komossa, S.; Gallo, L. C. +9 more

Our project MOMO (Multiwavelength observations and modeling of OJ 287) consists of dedicated, dense, long-term flux and spectroscopic monitoring, and deep follow-up observations of the blazar OJ 287 at >13 frequencies from the radio to the X-ray band since late 2015. In particular, we are using Swift to obtain optical-UV-X-ray spectral energy d…

A Long-Term Study of Ultraluminous X-ray Sources in NGC 891

Earley, Nicholas M.; Dwarkadas, Vikram V.; Cirillo, Victoria

We perform empirical fits to the Chandra and XMM-Newton spectra of three ultraluminous X-ray sources (ULXs) in the edge-on spiral galaxy NGC 891, monitoring the region over a 17-year time window. One of these sources was visible since the early 1990s with ROSAT and was observed multiple times with Chandra and XMM-Newton. Another was visible since …

Searching for Gamma-Ray Binaries in Multiwavelength Catalogs

Luque-Escamilla, Pedro L.; Martí, Josep

The number of gamma-ray binaries currently known is still so small that even a new finding represents a significant expansion of its population. We present a possible hunting strategy based on screening different catalogs to filter potential peculiar stars consistent with gamma-ray sources whose association at lower energies is not yet certain. So…