Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies
We present new radio continuum observations of NGC 253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC 253 between 76 MHz and 11 GHz. The spectrum is best described as a sum of a cen...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
| Published: |
IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/109763 https://orcid.org/0000-0003-3336-9958 https://orcid.org/0000-0002-0086-7363 https://orcid.org/0000-0003-0422-2324 https://orcid.org/0000-0002-4117-570X https://orcid.org/0000-0001-7776-7240 https://orcid.org/0000-0001-7670-7190 https://orcid.org/0000-0001-7130-208X |
| _version_ | 1826204114550259712 |
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| author | Kapińska, A. D. Staveley-Smith, L. Crocker, R. Meurer, G. R. Bhandari, S. Hurley-Walker, N. Offringa, A. R. Hanish, D. J. Seymour, N. Ekers, R. D. Bell, M. E. Callingham, J. R. Dwarakanath, K. S. For, B.-Q. Gaensler, B. M. Hancock, P. J. Hindson, L. Johnston-Hollitt, M. Lenc, E. McKinley, B. Morgan, J. Procopio, P. Wayth, R. B. Wu, C. Zheng, Q. Barry, N. Beardsley, A. P. Bowman, J. D. Briggs, F. Carroll, P. Hazelton, B. J. Jacobs, D. J. Kim, H.-S. Kittiwisit, P. Line, J. Mitchell, D. A. Morales, M. F. Paul, S. Pindor, B. Pober, J. C. Riding, J. Sethi, S. K. Shankar, N. Udaya Subrahmanyan, R. Sullivan, I. S. Thyagarajan, N. Tingay, S. J. Trott, C. M. Webster, R. L. Wyithe, S. B. Cappallo, R. J. Deshpande, A. A. Kaplan, D. L. Lonsdale, C. J. McWhirter, S. R. Oberoi, D. Ord, S. M. Prabu, T. Srivani, K. S. Williams, A. Dillon, Joshua Shane Ewall-Wice, Aaron Michael Feng, Lu Hewitt, Jacqueline N Loeb, A. Neben, Abraham Richard Tegmark, Max Erik Morgan, Edward H Williams, Christopher Leigh Greenhill, Lincoln J. |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Kapińska, A. D. Staveley-Smith, L. Crocker, R. Meurer, G. R. Bhandari, S. Hurley-Walker, N. Offringa, A. R. Hanish, D. J. Seymour, N. Ekers, R. D. Bell, M. E. Callingham, J. R. Dwarakanath, K. S. For, B.-Q. Gaensler, B. M. Hancock, P. J. Hindson, L. Johnston-Hollitt, M. Lenc, E. McKinley, B. Morgan, J. Procopio, P. Wayth, R. B. Wu, C. Zheng, Q. Barry, N. Beardsley, A. P. Bowman, J. D. Briggs, F. Carroll, P. Hazelton, B. J. Jacobs, D. J. Kim, H.-S. Kittiwisit, P. Line, J. Mitchell, D. A. Morales, M. F. Paul, S. Pindor, B. Pober, J. C. Riding, J. Sethi, S. K. Shankar, N. Udaya Subrahmanyan, R. Sullivan, I. S. Thyagarajan, N. Tingay, S. J. Trott, C. M. Webster, R. L. Wyithe, S. B. Cappallo, R. J. Deshpande, A. A. Kaplan, D. L. Lonsdale, C. J. McWhirter, S. R. Oberoi, D. Ord, S. M. Prabu, T. Srivani, K. S. Williams, A. Dillon, Joshua Shane Ewall-Wice, Aaron Michael Feng, Lu Hewitt, Jacqueline N Loeb, A. Neben, Abraham Richard Tegmark, Max Erik Morgan, Edward H Williams, Christopher Leigh Greenhill, Lincoln J. |
| author_sort | Kapińska, A. D. |
| collection | MIT |
| description | We present new radio continuum observations of NGC 253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC 253 between 76 MHz and 11 GHz. The spectrum is best described as a sum of a central starburst and extended emission. The central component, corresponding to the inner 500 pc of the starburst region of the galaxy, is best modeled as an internally free–free absorbed synchrotron plasma, with a turnover frequency around 230 MHz. The extended emission component of the spectrum of NGC 253 is best described as a synchrotron emission flattening at low radio frequencies. We find that 34% of the extended emission (outside the central starburst region) at 1 GHz becomes partially absorbed at low radio frequencies. Most of this flattening occurs in the western region of the southeast halo, and may be indicative of synchrotron self-absorption of shock-reaccelerated electrons or an intrinsic low-energy cutoff of the electron distribution. Furthermore, we detect the large-scale synchrotron radio halo of NGC 253 in our radio images. At 154–231 MHz the halo displays the well known X-shaped/horn-like structure, and extends out to ~8 kpc in the z-direction (from the major axis). |
| first_indexed | 2024-09-23T12:49:07Z |
| format | Article |
| id | mit-1721.1/109763 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:49:07Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1097632022-10-01T11:19:13Z Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies Kapińska, A. D. Staveley-Smith, L. Crocker, R. Meurer, G. R. Bhandari, S. Hurley-Walker, N. Offringa, A. R. Hanish, D. J. Seymour, N. Ekers, R. D. Bell, M. E. Callingham, J. R. Dwarakanath, K. S. For, B.-Q. Gaensler, B. M. Hancock, P. J. Hindson, L. Johnston-Hollitt, M. Lenc, E. McKinley, B. Morgan, J. Procopio, P. Wayth, R. B. Wu, C. Zheng, Q. Barry, N. Beardsley, A. P. Bowman, J. D. Briggs, F. Carroll, P. Hazelton, B. J. Jacobs, D. J. Kim, H.-S. Kittiwisit, P. Line, J. Mitchell, D. A. Morales, M. F. Paul, S. Pindor, B. Pober, J. C. Riding, J. Sethi, S. K. Shankar, N. Udaya Subrahmanyan, R. Sullivan, I. S. Thyagarajan, N. Tingay, S. J. Trott, C. M. Webster, R. L. Wyithe, S. B. Cappallo, R. J. Deshpande, A. A. Kaplan, D. L. Lonsdale, C. J. McWhirter, S. R. Oberoi, D. Ord, S. M. Prabu, T. Srivani, K. S. Williams, A. Dillon, Joshua Shane Ewall-Wice, Aaron Michael Feng, Lu Hewitt, Jacqueline N Loeb, A. Neben, Abraham Richard Tegmark, Max Erik Morgan, Edward H Williams, Christopher Leigh Greenhill, Lincoln J. Haystack Observatory MIT Kavli Institute for Astrophysics and Space Research Dillon, Joshua Shane Ewall-Wice, Aaron Michael Feng, Lu Greenhill, Lincoln J Hewitt, Jacqueline N Loeb, A. Neben, Abraham Richard Tegmark, Max Erik Morgan, Edward H Williams, Christopher Leigh We present new radio continuum observations of NGC 253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC 253 between 76 MHz and 11 GHz. The spectrum is best described as a sum of a central starburst and extended emission. The central component, corresponding to the inner 500 pc of the starburst region of the galaxy, is best modeled as an internally free–free absorbed synchrotron plasma, with a turnover frequency around 230 MHz. The extended emission component of the spectrum of NGC 253 is best described as a synchrotron emission flattening at low radio frequencies. We find that 34% of the extended emission (outside the central starburst region) at 1 GHz becomes partially absorbed at low radio frequencies. Most of this flattening occurs in the western region of the southeast halo, and may be indicative of synchrotron self-absorption of shock-reaccelerated electrons or an intrinsic low-energy cutoff of the electron distribution. Furthermore, we detect the large-scale synchrotron radio halo of NGC 253 in our radio images. At 154–231 MHz the halo displays the well known X-shaped/horn-like structure, and extends out to ~8 kpc in the z-direction (from the major axis). 2017-06-09T14:24:08Z 2017-06-09T14:24:08Z 2017-03 2017-01 Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/109763 Kapińska, A. D.; Staveley-Smith, L.; Crocker, R.; Meurer, G. R.; Bhandari, S.; Hurley-Walker, N.; Offringa, A. R. et al. “Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies.” The Astrophysical Journal 838, no. 1 (March 27, 2017): 68 © 2017 The American Astronomical Society https://orcid.org/0000-0003-3336-9958 https://orcid.org/0000-0002-0086-7363 https://orcid.org/0000-0003-0422-2324 https://orcid.org/0000-0002-4117-570X https://orcid.org/0000-0001-7776-7240 https://orcid.org/0000-0001-7670-7190 https://orcid.org/0000-0001-7130-208X en_US http://dx.doi.org/10.3847/1538-4357/aa5f5d Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Kapińska, A. D. Staveley-Smith, L. Crocker, R. Meurer, G. R. Bhandari, S. Hurley-Walker, N. Offringa, A. R. Hanish, D. J. Seymour, N. Ekers, R. D. Bell, M. E. Callingham, J. R. Dwarakanath, K. S. For, B.-Q. Gaensler, B. M. Hancock, P. J. Hindson, L. Johnston-Hollitt, M. Lenc, E. McKinley, B. Morgan, J. Procopio, P. Wayth, R. B. Wu, C. Zheng, Q. Barry, N. Beardsley, A. P. Bowman, J. D. Briggs, F. Carroll, P. Hazelton, B. J. Jacobs, D. J. Kim, H.-S. Kittiwisit, P. Line, J. Mitchell, D. A. Morales, M. F. Paul, S. Pindor, B. Pober, J. C. Riding, J. Sethi, S. K. Shankar, N. Udaya Subrahmanyan, R. Sullivan, I. S. Thyagarajan, N. Tingay, S. J. Trott, C. M. Webster, R. L. Wyithe, S. B. Cappallo, R. J. Deshpande, A. A. Kaplan, D. L. Lonsdale, C. J. McWhirter, S. R. Oberoi, D. Ord, S. M. Prabu, T. Srivani, K. S. Williams, A. Dillon, Joshua Shane Ewall-Wice, Aaron Michael Feng, Lu Hewitt, Jacqueline N Loeb, A. Neben, Abraham Richard Tegmark, Max Erik Morgan, Edward H Williams, Christopher Leigh Greenhill, Lincoln J. Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies |
| title | Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies |
| title_full | Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies |
| title_fullStr | Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies |
| title_full_unstemmed | Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies |
| title_short | Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies |
| title_sort | spectral energy distribution and radio halo of ngc 253 at low radio frequencies |
| url | http://hdl.handle.net/1721.1/109763 https://orcid.org/0000-0003-3336-9958 https://orcid.org/0000-0002-0086-7363 https://orcid.org/0000-0003-0422-2324 https://orcid.org/0000-0002-4117-570X https://orcid.org/0000-0001-7776-7240 https://orcid.org/0000-0001-7670-7190 https://orcid.org/0000-0001-7130-208X |
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