Published March 1, 2021 | Version v1
Journal article Metadata-only

X-Ray Pulsar XTE J1858+034: Discovery of the Cyclotron Line and the Revised Optical Identification

Creators

  • 1. Department of Physics and Astronomy, FI-20014 University of Turku (Finland)
  • 2. Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, Moscow 117997 (Russian Federation)
  • 3. Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Santa Cruz de Tenerife (Spain)
  • 4. NASA Marshall Space Flight Center, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805 (United States)
  • 5. European Space Agency (ESA), European Space Astronomy Centre (ESAC), Camino Bajo del Castillo s/n, E-28692 Villanueva de la Caada, Madrid (Spain)

Description

We present the results of a detailed investigation of the poorly studied X-ray pulsar (XRP) XTE J1858+034 based on the data obtained with the NuSTAR observatory during the outburst of the source in 2019. The spectral analysis resulted in the discovery of a cyclotron absorption feature in the source spectrum at ∼48 keV in both the pulse phase-averaged and resolved spectra. Accurate X-ray localization of the source using the NuSTAR and Chandra observatories allowed us to accurately determine the position of the X-ray source and identify the optical companion of the pulsar. The analysis of the counterpart properties suggested that the system is likely a symbiotic binary hosting an XRP and a late-type companion star of the K-M classes rather than a Be X-ray binary as previously suggested.

Availability note (English)

Available from http://dx.doi.org/10.3847/1538-4357/abddbd

Additional details

Identifiers

DOI
10.3847/1538-4357/abddbd;

Publishing Information

Journal Title
Astrophysical Journal
Journal Volume
909
Journal Issue
2
Journal Page Range
[10 p.]
ISSN
0004-637X
CODEN
ASJOAB

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
53081366
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
Descriptors DEI
ABSORPTION; CYCLOTRONS; KEV RANGE; PULSARS; PULSES; SPECTRA; STARS; X RADIATION; X-RAY SOURCES
Descriptors DEC
ACCELERATORS; COSMIC RADIO SOURCES; CYCLIC ACCELERATORS; ELECTROMAGNETIC RADIATION; ENERGY RANGE; IONIZING RADIATIONS; RADIATION SOURCES; RADIATIONS; SORPTION