Skip to main content
SpringerLink
Log in

Luminosity dependent cyclotron line in Swift J1626.6−5156

  • Published:
Journal of Astrophysics and Astronomy Aims and scope Submit manuscript

Abstract

We studied the timing and spectral properties of the Be/X-ray pulsar Swift J1626.6−5156 using the NICER observations of its 2021 outburst. The most important observation is the positive correlation of the centroid energy of the fundamental cyclotron line with the luminosity. This observation agrees with the usual positive correlation of the centroid energy cyclotron line with luminosity in the sub-critical regime. The correlation between the two quantities is verified using two different continuum models. The photon index decreases with an increase in flux. Thus, the spectrum is softer when the flux is low, which may be due to a decrease in the optical depth of the accretion column with a decrease in the flux.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

Notes

  1. https://heasarc.gsfc.nasa.gov/docs/nicer/data_analysis/nicer_analysis_tips.html.

  2. https://heasarc.gsfc.nasa.gov/docs/nicer/tools/nicer_bkg_estimator_README.txt.

  3. https://heasarc.gsfc.nasa.gov/docs/nicer/analysis_threads/arf-rmf/.

References

  • Arnaud K. A. 1996, in Astronomical Data Analysis Software and Systems V

  • Arzoumanian Z., Gendreau K. C., Baker C. L. et al. 2014, Proc. SPIE, 9144, 914420

  • Bailer-Jones C. A. L., Rybizki J., Fouesneau M., Demleitner M., Andrae R. 2021, AJ, 161, 147

  • Basko M. M., Sunyaev R. A. 1976, MNRAS, 175, 395

    Article  ADS  Google Scholar 

  • Baykal A., Gogus E., Inam S. C., Belloni T. 2010, ApJ, 711, 1306

    Article  CAS  ADS  Google Scholar 

  • Becker P. A. 1998, ApJ, 498, 790

  • Becker P. A., Klochkov D., Schönherr G. et al. 2012, A &A, 544, A123

    Google Scholar 

  • Beloborodov A. M. 2002, ApJ, 566, L85

    Article  ADS  Google Scholar 

  • Chen X. et al. 2021, ApJ, 919, 33

  • Coburn W., Pottschmidt K., Rothschild R. et al. 2006, BAAS, 38, 340

    ADS  Google Scholar 

  • Cusumano G., La Parola V. et al. 2016, MNRAS, 460, L99

  • DeCesar M. E., Pottschmidt K., Wilms J. 2009, ATel, 2036

  • DeCesar M. E., Boyd P. T., Pottschmidt K. et al. 2013, ApJ, 762, 61

    Article  ADS  Google Scholar 

  • Doroshenko V., Tsygankov S. S., Mushtukov A. A. et al. 2017, MNRAS, 466, 2143

    Article  CAS  ADS  Google Scholar 

  • Fürst F., Pottschmidt K., Wilms J. et al. 2014, ApJ, 780, 133

  • Gendreau K., Arzoumanian Z., Adkins P. W. et al. 2016, Proc. SPIE, 9905, 99051H

  • Gupta S., Naik S., Jaisawal G. K., Epili P. R. 2018, MNRAS, 479, 5612

    Article  CAS  ADS  Google Scholar 

  • Heindl W. A., Rothschild R. E., Coburn W. et al. 2004, AIP Conf. Ser., 714, 323

    Article  CAS  ADS  Google Scholar 

  • Hickox R. C., Narayan R., Kallman T. R. 2004, ApJ, 614, 881

    Article  CAS  ADS  Google Scholar 

  • Icdem B., Inam S. C., Baykal A. 2011, MNRAS, 415, 1523

  • Iwakiri W. et al. 2021, ATel, 14457, 1

    ADS  Google Scholar 

  • Jaisawal G. K., Naik S. 2015, MNRAS, 453, L21

    Article  CAS  ADS  Google Scholar 

  • Jaisawal G. K., Naik S. 2016, MNRAS, 461, L97

    Article  CAS  ADS  Google Scholar 

  • Klochkov D., Staubert R., Santangelo A., Rothschild R. E., Ferrigno C. 2011, A &A, 532, A126

    Google Scholar 

  • Krimm H., Barthelmy S., Capalbi M. et al. 2005, GCN, 4361

  • La Palombara N., Mereghetti S. 2006, A &A, 455, 283

    ADS  Google Scholar 

  • Lyubarskii Y. E., Syunyaev R. A. 1982, Soviet Astronomy Letters, 8, 330

    ADS  Google Scholar 

  • Makishima K., Mihara T., Ishida M. et al. 1990, ApJ, 365, L59

    Article  CAS  ADS  Google Scholar 

  • Maitra C., Paul B., Haberl F., Vasilopoulos G. 2018, MNRAS, 480, L136

    Article  CAS  ADS  Google Scholar 

  • Malacaria C. et al. 2022, ApJ, 927, 194

    Article  ADS  Google Scholar 

  • Mandal M., Pal S. 2022, MNRAS, 511, 1121

    Article  CAS  ADS  Google Scholar 

  • Mihara T., Makishima K., Nagase F. 1995, BAAS, 1434, 27

  • Mihara T., Makishima K., Nagase F. 2004, ApJ, 610, 390

    Article  CAS  ADS  Google Scholar 

  • Molkov S., Lutovinov A., Tsygankov S. et al. 2021, ATel, 14462, 1

  • Molkov S., Doroshenko V., Lutovinov A. et al. 2021, ApJ, 915, L27

  • Mushtukov A. A., Suleimanov V. F., Tsygankov S. S., Poutanen J. 2015, MNRAS, 454, 2539

  • Mushtukov A. A., Tsygankov S. S., Serber A. V., Suleimanov V. F., Poutanen J. 2015, MNRAS, 454, 2714

    Article  CAS  ADS  Google Scholar 

  • Mushtukov A. A., Suleimanov V. F., Tsygankov S. S., Poutanen J. 2015, MNRAS, 447, 1847

    Article  CAS  ADS  Google Scholar 

  • Negoro H. et al. 2021, ATel, 14454, 1

  • Palmer D., Barthelmy S., Cummings J. et al. 2005, ATel, 678

  • Pottschmidt K., Kreykenbohm I., Wilms J. et al. 2005, ApJ, 634, L97

    Article  CAS  ADS  Google Scholar 

  • Rai B., Paul B., Tobrej M. et al. 2023, JoAA, 44, 39

    Google Scholar 

  • Raman G., Varun B., Paul B., Bhattacharya D. 2021, MNRAS, 508, 5578

    CAS  ADS  Google Scholar 

  • Reig P., Belloni T., Israel G. L. et al. 2008, A &A, 485, 797

  • Reig P., Nespoli E., Fabregat J., Mennickent R. E. 2011, A &A, 533, 23

    Google Scholar 

  • Reig P., Nespoli E. 2013, A &A, 332, 1

  • Remillard R. A. 2022, ApJ, 163, 30

    Article  Google Scholar 

  • Rothschild R. E., Köhnel M., Pottschmidt K. et al. 2017, MNRAS, 466, 2752

  • Salganik A., Tsygankov S. S., Lutovinov A. L. et al. 2022, MNRAS, 514, 2707

  • Staubert R., Shakura N. I., Postnov K. et al. 2007, A &A, 465, L25

    ADS  Google Scholar 

  • Staubert R. et al. 2019, A &A, 622, A61

    CAS  Google Scholar 

  • Tsygankov S. S., Lutovinov A. A., Churazov E. M., Sunyaev R. A. 2006, MNRAS, 371, 19

    Article  ADS  Google Scholar 

  • Titarchuk L. 1994, ApJ, 434, 5

    Article  Google Scholar 

  • Vybornov V., Klochkov D., Gornostaev M. et al. 2017, A &A, 601, A126

Download references

Acknowledgements

This research has used software and publicly available data provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), a service of the Astrophysics Science Division at NASA/GSFC. The authors thank ICARD and NBU for providing extended research facilities. The authors are thankful to the reviewers for their valuable suggestions to improve the quality of the paper.

Author information

Authors and Affiliations

  1. Department of Physics, North Bengal University, Siliguri, Darjeeling, 734013, India

    Binay Rai, Mohammed Tobrej, Manoj Ghising, Ruchi Tamang & Bikash Chandra Paul

  2. IUCAA Centre for Astronomy Research & Development, North Bengal University, Siliguri, Darjeeling, 734013, India

    Biswajit Paul

Authors
  1. Binay Rai
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Biswajit Paul
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Mohammed Tobrej
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Manoj Ghising
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Ruchi Tamang
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Bikash Chandra Paul
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Bikash Chandra Paul.

Rights and permissions

Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Rai, B., Paul, B., Tobrej, M. et al. Luminosity dependent cyclotron line in Swift J1626.6−5156. J Astrophys Astron 45, 7 (2024). https://doi.org/10.1007/s12036-023-09994-0

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s12036-023-09994-0

Keywords

Search

Navigation