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The Crab Nebula at subarcsecond resolution with the International LOFAR Telescope

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arxiv 2506.19460 v1 pith:FWSPH6QY submitted 2025-06-24 astro-ph.HE

M. Arias , R. Timmerman , F. Sweijen , R. J. van Weeren , C. G. Bassa This is my paper
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abstract

We present International LOw Frequency ARray (LOFAR) Telescope (ILT) observations of the Crab Nebula, the remnant of a core-collapse supernova explosion observed by astronomers in 1054. The field of the Crab Nebula was observed between 120 and 168 MHz as part of the LOFAR Two Meter Sky Survey (LoTSS), and the data were re-processed to include the LOFAR international stations to create a high angular resolution ($0.43'' \times 0.28''$) map at a central frequency of 145 MHz. Combining the ILT map with archival centimeter-range observations of the Nebula with the Very Large Array (VLA) and LOFAR data at 54 MHz, we become sensitive to the effects of free-free absorption against the synchrotron emission of the pulsar wind nebula. This absorption is caused by the ionised filaments visible in optical and infrared data of the Crab Nebula, which are the result of the pulsar wind nebula expanding into the denser stellar ejecta that surrounds it and forming Rayleigh-Taylor fingers. The LOFAR observations are sensitive to two components of these filaments: their dense cores, which show electron densities of $\gtrsim1,000$ cm$^{-3}$, and the diffuse envelopes, with electron densities of $\sim50-250$ cm$^{-3}$. The denser structures have widths of $\sim0.03$ pc, whereas the diffuse component is at one point as large as $0.2$ pc. The morphology of the two components is not always the same. These finding suggests that the layered temperature, density, and ionisation structure of the Crab optical filaments extends to larger scales than previously considered.

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33 extracted references

  1. [1]

    2018, A&A, 612, A110

    Arias, M., Vink, J., de Gasperin, F., et al. 2018, A&A, 612, A110

    2018

  2. [2]

    2019, AJ, 158, 253

    Arias, M., Vink, J., Zhou, P., et al. 2019, AJ, 158, 253

    2019

  3. [3]

    Baars, J. W. M., Genzel, R., Pauliny-Toth, I. I. K., & Witzel, A. 1977, A&A, 61, 99

    1977

  4. [4]

    F., Hester, J

    Bietenholz, M. F., Hester, J. J., Frail, D. A., & Bartel, N. 2004, ApJ, 615, 794

    2004

  5. [5]

    F., Kassim, N., Frail, D

    Bietenholz, M. F., Kassim, N., Frail, D. A., et al. 1997, ApJ, 490, 291

    1997

  6. [6]

    Bietenholz, M. F. & Kronberg, P. P. 1990, ApJ, 357, L13 Article number, page 9 of 10 A&A proofs:manuscript no. main

    1990

  7. [7]

    F., Yuan, Y ., Buehler, R., Lobanov, A

    Bietenholz, M. F., Yuan, Y ., Buehler, R., Lobanov, A. P., & Blandford, R. 2015, MNRAS, 446, 205

    2015

  8. [8]

    P., Long, K

    Blair, W. P., Long, K. S., Vancura, O., et al. 1992, ApJ, 399, 611

    1992

Show all 33 references
  1. [9]

    Chevalier, R. A. & Gull, T. R. 1975, ApJ, 200, 399 de Gasperin, F., Dijkema, T. J., Drabent, A., et al. 2019, A&A, 622, A5 de Gasperin, F., Vink, J., McKean, J. P., et al. 2020, A&A, 635, A150

    1975

  2. [10]

    Fesen, R. A. & Kirshner, R. P. 1982, ApJ, 258, 1

    1982

  3. [11]

    A., Kassim, N

    Frail, D. A., Kassim, N. E., Cornwell, T. J., & Goss, W. M. 1995, ApJ, 454, L129

    1995

  4. [12]

    R., Wright, G

    Graham, J. R., Wright, G. S., & Longmore, A. J. 1990, ApJ, 352, 172

    1990

  5. [13]

    & Campbell, D

    Heiles, C. & Campbell, D. B. 1970, Nature, 226, 529

    1970

  6. [14]

    Hester, J. J. 2008, ARA&A, 46, 127

    2008

  7. [15]

    J., Stone, J

    Hester, J. J., Stone, J. M., Scowen, P. A., et al. 1996, ApJ, 456, 225

    1996

  8. [16]

    T., Jagannathan, P., Mooley, K

    Intema, H. T., Jagannathan, P., Mooley, K. P., & Frail, D. A. 2017, A&A, 598, A78

    2017

  9. [17]

    W., & van Straten, W

    Karuppusamy, R., Stappers, B. W., & van Straten, W. 2010, A&A, 515, A36

    2010

  10. [18]

    E., Perley, R

    Kassim, N. E., Perley, R. A., Erickson, W. C., & Dwarakanath, K. S. 1993, AJ, 106, 2218

    1993

  11. [19]

    R., Masters, J

    Kent, B. R., Masters, J. S., Chandler, C. J., et al. 2018, in American Astronomical Society Meeting Abstracts, V ol. 231, American Astronomical Society Meet- ing Abstracts #231, 342.14

    2018

  12. [20]

    M., Desch, S

    Loll, A. M., Desch, S. J., Scowen, P. A., & Foy, J. P. 2013, ApJ, 765, 152

    2013

  13. [21]

    2021, MNRAS, 502, 1864

    Martin, T., Milisavljevic, D., & Drissen, L. 2021, MNRAS, 502, 1864

    2021

  14. [22]

    2022, A&A, 658, A1

    Morabito, L., Jackson, N., Mooney, S., et al. 2022, A&A, 658, A1

    2022

  15. [23]

    R., McKinley, B., Hurley-Walker, N., et al

    Offringa, A. R., McKinley, B., Hurley-Walker, N., et al. 2014, MNRAS, 444, 606

    2014

  16. [24]

    Owen, P. J. & Barlow, M. J. 2015, ApJ, 801, 141

    2015

  17. [25]

    Rybicki, G. B. & Lightman, A. P. 1986, Radiative Processes in Astrophysics

    1986

  18. [26]

    J., Scowen, P

    Sankrit, R., Hester, J. J., Scowen, P. A., et al. 1998, ApJ, 504, 344

    1998

  19. [27]

    W., Hardcastle, M

    Shimwell, T. W., Hardcastle, M. J., Tasse, C., et al. 2022, A&A, 659, A1

    2022

  20. [28]

    W., Röttgering, H

    Shimwell, T. W., Röttgering, H. J. A., Best, P. N., et al. 2017, A&A, 598, A104

    2017

  21. [29]

    W., Tasse, C., Hardcastle, M

    Shimwell, T. W., Tasse, C., Hardcastle, M. J., et al. 2019, A&A, 622, A1

    2019

  22. [30]

    2000, ApJ, 537, 861

    Sollerman, J., Lundqvist, P., Lindler, D., et al. 2000, ApJ, 537, 861

    2000

  23. [31]

    M., Kavanagh, P

    Temim, T., Laming, J. M., Kavanagh, P. J., et al. 2024, ApJ, 968, L18

    2024

  24. [32]

    1973, PASP, 85, 579 van Haarlem, M

    Trimble, V . 1973, PASP, 85, 579 van Haarlem, M. P., Wise, M. W., Gunst, A. W., et al. 2013, A&A, 556, A2 van Weeren, R. J., Shimwell, T. W., Botteon, A., et al. 2021, A&A, 651, A115 van Weeren, R. J., Williams, W. L., Hardcastle, M. J., et al. 2016, ApJS, 223, 2

    1973

  25. [33]

    C., Elsner, R

    Weisskopf, M. C., Elsner, R. F., Kolodziejczak, J. J., O’Dell, S. L., & Tennant, A. F. 2012, ApJ, 746, 41

    2012

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