SIMBAD references

2025ApJ...991...28P - Astrophys. J., 991, 28 (2025/September-3)

Multiwavelength Study of HESS J0632+057: New Insights into Pulsar-Disk Interaction.

PARK J., AN H., KIM C., MATCHETT N., MORI K., VAN SOELEN B., ARCHER A., BANGALE P., BARTKOSKE J.T., BENBOW W., BUCKLEY J.H., CHEN Y., CHROMEY A.J., DUERR A., ERRANDO M., ESCOBAR GODOY M., FALCONE A., FELDMAN S., FENG Q., FILBERT S., FORTSON L., FURNISS A., HANLON W., HERVET O., HINRICHS C.E., HOLDER J., HUMENSKY T.B., JIN W., JOHNSON M.N., KAARET P., KERTZMAN M., KHERLAKIAN M., KIEDA D., KLEINER T.K., KORZOUN N., KUMAR S., LANG M.J., LUNDY M., MAIER G., MORIARTY P., MUKHERJEE R., OHISHI M., ONG R.A., PANDEY A., POHL M., PUESCHEL E., QUINN J., RABINOWITZ P.L., RAGAN K., RIBEIRO D., ROACHE E., SADEH I., SAHA L., SEMBROSKI G.H., SHANG R., TUCCI J.V., VASSILIEV V.V., WEINSTEIN A., WILLIAMS D.A., WONG S.L., YOSHIKOSHI T. (The VERITAS Collaboration)

Abstract (from CDS):

We present an analysis of new multiwavelength observations of the TeV gamma-ray binary HESS J0632+057, conducted using SALT, Swift, NuSTAR, and VERITAS in 2023-2024. By combining these new data with archival observations, we confirm previous suggestions of orbital variability in the source's X-ray spectrum, including increased X-ray absorption at the orbital phase interval of ϕ ≈ 0.3-0.4. The source's X-ray flux within this phase interval seems to have exhibited a significant change on an orbital timescale. Additionally, occasional short-term variations in the X-ray band on a timescale of less than 3 days have been observed. The measured duration of the increased absorbing column density and the flux variability timescales can provide clues about the interaction between the putative pulsar and the Be companion's disk if, as previously suggested, the pulsar crosses the disk at this phase interval. Moreover, the new contemporaneous X-ray and TeV observations around the pulsar-crossing phases revealed independent variability in the X-ray and TeV fluxes, contrary to a previous observation of concurrent flux increases. While these observations alone cannot provide definitive conclusions, we discuss our results in the context of pulsar-disk interaction and intrabinary shock emission scenarios.

Journal keyword(s): Gamma-ray astronomy - Gamma-ray sources - X-ray astronomy - X-ray sources - X-ray binary stars - High energy astrophysics - Optical observation - Circumstellar disks

Simbad objects: 4

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