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Magnetic support of the optical emission line filaments in NGC 1275

Abstract

The giant elliptical galaxy NGC 1275, at the centre of the Perseus cluster, is surrounded by a well-known giant nebulosity of emission-line filaments1,2, which are plausibly in excess of 108 years old3. The filaments are dragged out from the centre of the galaxy by radio-emitting ‘bubbles’ rising buoyantly in the hot intracluster gas4, before later falling back. They act as markers of the feedback process by which energy is transferred from the central massive black hole to the surrounding gas. The mechanism by which the filaments are stabilized against tidal shear and dissipation into the surrounding extremely hot (4 × 107 K) gas has been unclear. Here we report observations that resolve thread-like structures in the filaments. Some threads extend over 6 kpc, yet are only 70 pc wide. We conclude that magnetic fields in the threads, in pressure balance with the surrounding gas, stabilize the filaments, so allowing a large mass of cold gas to accumulate and delay star formation.

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Figure 1: Image of the Hα emission from the core of the cluster.
Figure 2: Comparison of our HST image of the northern filament system (about 25 kpc north of the nucleus) with that from the WIYN telescope2.
Figure 3: Horseshoe filament system about 25 kpc to the northwest of the nucleus.
Figure 4: Clumps of stars and Hα filaments to the southeast and south of the nucleus.

References

  1. Kent, S. M. & Sargent, W. L. W. Ionization and excitation mechanisms in the filaments around NGC 1275. Astrophys. J. 230, 667–680 (1979)

    ADS  CAS  Article  Google Scholar 

  2. Conselice, C. J., Gallagher, J. S. & Wyse, R. F. G. On the nature of the NGC 1275 system. Astron. J. 122, 2281–2300 (2001)

    ADS  CAS  Article  Google Scholar 

  3. Hatch, N. A., Crawford, C. S., Fabian, A. C. & Johnstone, R. M. Detections of molecular hydrogen in the outer filaments of NGC1275. Mon. Not. R. Astron. Soc. 358, 765–773 (2005)

    ADS  CAS  Article  Google Scholar 

  4. Hatch, N. A., Crawford, C. S., Johnstone, R. M. & Fabian, A. C. On the origin and excitation of the extended nebula surrounding NGC1275. Mon. Not. R. Astron. Soc. 367, 433–448 (2006)

    ADS  CAS  Article  Google Scholar 

  5. Fabian, A. C. et al. The relationship between the optical Hα filaments and the X-ray emission in the core of the Perseus cluster. Mon. Not. R. Astron. Soc. 344, L48–L52 (2003)

    ADS  Article  Google Scholar 

  6. Salomé, P. et al. Cold gas in the Perseus cluster core: Excitation of molecular gas in filaments. Astron. Astrophys. 484, 317–325 (2008)

    ADS  Article  Google Scholar 

  7. Johnstone, R. M. et al. Discovery of atomic and molecular mid-infrared emission lines in offnuclear regions of NGC1275 and NGC4696 with the Spitzer Space Telescope. Mon. Not. R. Astron. Soc. 382, 1246–1260 (2007)

    ADS  CAS  Article  Google Scholar 

  8. Fabian, A. C. et al. A very deep Chandra observation of the Perseus cluster: Shocks, ripples and conduction. Mon. Not. R. Astron. Soc. 366, 417–428 (2006)

    ADS  CAS  Article  Google Scholar 

  9. Heiles, C. & Crutcher, R. in Cosmic Magnetic Fields (eds Wielebinski, R. & Beck, R.) 137–182 (Lecture Notes in Physics 664, Springer, 2005)

    Book  Google Scholar 

  10. McKee, C. F., Zweibel, E. G., Goodman, A. A. & Heiles, C. in Protostars and Planets III (eds Levy, E. H. & Lunine, J. I.) 327–366 (Univ. Arizona Press, 1993)

    Google Scholar 

  11. Low, B. C. Solar activity and the corona. Sol. Phys. 167, 217–265 (1996)

    ADS  Article  Google Scholar 

  12. Ferland, G. J. et al. The origin of molecular hydrogen emission in cooling-flow filaments. Mon. Not. R. Astron. Soc. 368, L72–L76 (2008)

    ADS  Article  Google Scholar 

  13. Taylor, G. B. et al. Magnetic fields in the centre of the Perseus cluster. Mon. Not. R. Astron. Soc. 368, 1500–1506 (2006)

    ADS  CAS  Article  Google Scholar 

  14. Holtzman, J. A. et al. Planetary Camera observations of NGC 1275 — Discovery of a central population of compact massive blue star clusters. Astron. J. 103, 691–702 (1992)

    ADS  Article  Google Scholar 

  15. Carlson, M. N. et al. Deep Hubble Space Telescope observations of star clusters in NGC 1275. Astron. J. 115, 1778–1790 (1998)

    ADS  Article  Google Scholar 

  16. Sanders, J. S. & Fabian, A. C. A deeper X-ray study of the core of the Perseus galaxy cluster: The power of sound waves and the distribution of metals and cosmic rays. Mon. Not. R. Astron. Soc. 381, 1381–1339 (2007)

    ADS  CAS  Article  Google Scholar 

  17. Reuland, M. et al. Giant Lyα nebulae associated with high-redshift radio galaxies. Astrophys. J. 592, 755–766 (2003)

    ADS  Article  Google Scholar 

  18. Koekemoer, A. M., Fruchter, A. S., Hook, R. N. & Hack, W. in The 2002 HST Calibration Workshop (eds Arribas, S., Koekemoer, A. & Whitmore, B.) 337 (Space Telescope Science Institute, 2002); available at 〈http://www.stsci.edu/hst/HST_overview/documents/calworkshop/workshop2002〉.

  19. Bertin, E. & Arnouts, S. SExtractor: Software for source extraction. Astron. Astrophys. Suppl. Ser. 117, 393–404 (1996)

    ADS  Article  Google Scholar 

  20. Joye, W. A. & Mandel, E. in Astronomical Data Analysis Software and Systems XIV (eds Shopbell, P., Britton, M. & Ebert, R.) 110–113 (ASP Conference Series 347, Astronomical Society of the Pacific, 2005)

    Google Scholar 

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Acknowledgements

A.C.F. thanks the Royal Society for support. E.Z. acknowledges support from NSF AST 0507367 and J.S.G. from HST-GO-11207.07-A.

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Correspondence to A. C. Fabian.

Supplementary information

Supplementary Information

The file contains Supplementary Notes, Supplementary Figures and Legends 1-5, and Supplementary Table 1. The Supplementary Notes describe the Supplementary Figures. Supplementary Figure 1 shows the filament system in comparison with the galaxy, created by combining the ACS data for the three filters. Supplementary Figure 2 compares the Hα filaments with the distribution of blue light. Supplementary Figure 3 compares the filaments with the hard X-ray emission showing the weak shock around the core of the cluster. Supplementary Figure 4 shows the Hα emission in detail for three interesting regions. Supplementary Figure 5 compares the width of the Hα filaments with a stellar profile, showing that they are resolved. Supplementary Table 1 is a log of observations analysed in the paper. (PDF 2009 kb)

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Fabian, A., Johnstone, R., Sanders, J. et al. Magnetic support of the optical emission line filaments in NGC 1275. Nature 454, 968–970 (2008). https://doi.org/10.1038/nature07169

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