ALMA Resolves the Nuclear Disks of Arp 220
We present 90 mas (37 pc) resolution ALMA imaging of Arp 220 in the CO (1-0) line and continuum at λ =2.6 mm. The internal gas distribution and kinematics of both galactic nuclei are well resolved for the first time. In the west nucleus, the major gas and dust emission extends out to 0[fraction of a...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/109530 https://orcid.org/0000-0002-5653-0786 |
| _version_ | 1826212287510216704 |
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| author | Scoville, Nick Murchikova, Lena Walter, Fabian Vlahakis, Catherine Koda, Jin Bout, Paul Vanden Barnes, Joshua Hernquist, Lars Sheth, Kartik Yun, Min Sanders, David Armus, Lee Cox, Pierre Thompson, Todd Robertson, Brant Zschaechner, Laura Tacconi, Linda Hayward, Christopher C. Genzel, Reinhard Hopkins, Phil Werf, Paul van der Decarli, Roberto Torrey, Paul A. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Scoville, Nick Murchikova, Lena Walter, Fabian Vlahakis, Catherine Koda, Jin Bout, Paul Vanden Barnes, Joshua Hernquist, Lars Sheth, Kartik Yun, Min Sanders, David Armus, Lee Cox, Pierre Thompson, Todd Robertson, Brant Zschaechner, Laura Tacconi, Linda Hayward, Christopher C. Genzel, Reinhard Hopkins, Phil Werf, Paul van der Decarli, Roberto Torrey, Paul A. |
| author_sort | Scoville, Nick |
| collection | MIT |
| description | We present 90 mas (37 pc) resolution ALMA imaging of Arp 220 in the CO (1-0) line and continuum at λ =2.6 mm. The internal gas distribution and kinematics of both galactic nuclei are well resolved for the first time. In the west nucleus, the major gas and dust emission extends out to 0[fraction of arcsecond symbol]2 radius (74 pc); the central resolution element shows a strong peak in the dust emission but a factor of 3 dip in the CO line emission. In this nucleus, the dust is apparently optically thick (τ [subscript 2.6mm ~ 1]) at λ = 2.6mm with a dust brightness temperature of ~147 K. The column of interstellar matter at this nucleus is N[subscript H2] ≥ 2 x 10 [superscript 26] cm[superscript −2], corresponding to ~900 gr cm[superscript −2]. The east nucleus is more elongated with radial extent 0[fraction of arcsecond symbol]3 or ~111 pc. The derived kinematics of the nuclear disks provide a good fit to the line profiles, yielding the emissivity distributions, the rotation curves, and velocity dispersions. In the west nucleus, there is evidence of a central Keplerian component requiring a central mass of 8 × 10[superscript 8]M [subscript ⊙]. The intrinsic widths of the emission lines are a Δν(FWHM})=250 (west) and 120 (east) km s[superscript −1]. Given the very short dissipation timescales for turbulence (≤ [superscript 5] years), we suggest that the line widths may be due to semicoherent motions within the nuclear disks. The symmetry of the nuclear disk structures is impressive, implying the merger timescale is significantly longer than the rotation period of the disks. |
| first_indexed | 2024-09-23T15:19:00Z |
| format | Article |
| id | mit-1721.1/109530 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:19:00Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1095302022-10-02T02:07:56Z ALMA Resolves the Nuclear Disks of Arp 220 Scoville, Nick Murchikova, Lena Walter, Fabian Vlahakis, Catherine Koda, Jin Bout, Paul Vanden Barnes, Joshua Hernquist, Lars Sheth, Kartik Yun, Min Sanders, David Armus, Lee Cox, Pierre Thompson, Todd Robertson, Brant Zschaechner, Laura Tacconi, Linda Hayward, Christopher C. Genzel, Reinhard Hopkins, Phil Werf, Paul van der Decarli, Roberto Torrey, Paul A. MIT Kavli Institute for Astrophysics and Space Research Torrey, Paul A. We present 90 mas (37 pc) resolution ALMA imaging of Arp 220 in the CO (1-0) line and continuum at λ =2.6 mm. The internal gas distribution and kinematics of both galactic nuclei are well resolved for the first time. In the west nucleus, the major gas and dust emission extends out to 0[fraction of arcsecond symbol]2 radius (74 pc); the central resolution element shows a strong peak in the dust emission but a factor of 3 dip in the CO line emission. In this nucleus, the dust is apparently optically thick (τ [subscript 2.6mm ~ 1]) at λ = 2.6mm with a dust brightness temperature of ~147 K. The column of interstellar matter at this nucleus is N[subscript H2] ≥ 2 x 10 [superscript 26] cm[superscript −2], corresponding to ~900 gr cm[superscript −2]. The east nucleus is more elongated with radial extent 0[fraction of arcsecond symbol]3 or ~111 pc. The derived kinematics of the nuclear disks provide a good fit to the line profiles, yielding the emissivity distributions, the rotation curves, and velocity dispersions. In the west nucleus, there is evidence of a central Keplerian component requiring a central mass of 8 × 10[superscript 8]M [subscript ⊙]. The intrinsic widths of the emission lines are a Δν(FWHM})=250 (west) and 120 (east) km s[superscript −1]. Given the very short dissipation timescales for turbulence (≤ [superscript 5] years), we suggest that the line widths may be due to semicoherent motions within the nuclear disks. The symmetry of the nuclear disk structures is impressive, implying the merger timescale is significantly longer than the rotation period of the disks. 2017-06-02T14:01:55Z 2017-06-02T14:01:55Z 2017-02 2017-01 Article http://purl.org/eprint/type/JournalArticle 1538-4357 http://hdl.handle.net/1721.1/109530 Scoville, Nick et al. “ALMA Resolves the Nuclear Disks of Arp 220.” The Astrophysical Journal 836.1 (2017): 66. © 2017 The American Astronomical Society https://orcid.org/0000-0002-5653-0786 en_US http://dx.doi.org/10.3847/1538-4357/836/1/66 The 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 | Scoville, Nick Murchikova, Lena Walter, Fabian Vlahakis, Catherine Koda, Jin Bout, Paul Vanden Barnes, Joshua Hernquist, Lars Sheth, Kartik Yun, Min Sanders, David Armus, Lee Cox, Pierre Thompson, Todd Robertson, Brant Zschaechner, Laura Tacconi, Linda Hayward, Christopher C. Genzel, Reinhard Hopkins, Phil Werf, Paul van der Decarli, Roberto Torrey, Paul A. ALMA Resolves the Nuclear Disks of Arp 220 |
| title | ALMA Resolves the Nuclear Disks of Arp 220 |
| title_full | ALMA Resolves the Nuclear Disks of Arp 220 |
| title_fullStr | ALMA Resolves the Nuclear Disks of Arp 220 |
| title_full_unstemmed | ALMA Resolves the Nuclear Disks of Arp 220 |
| title_short | ALMA Resolves the Nuclear Disks of Arp 220 |
| title_sort | alma resolves the nuclear disks of arp 220 |
| url | http://hdl.handle.net/1721.1/109530 https://orcid.org/0000-0002-5653-0786 |
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