Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA
We present an extensive analysis of the relationship between star formation rate surface density (∑SFR) and molecular gas surface density (∑H2) at sub-kpc scale in the elliptical galaxy Centaurus A (also known as NGC 5128) at the distance 3.8 Mpc. 12CO (J = 2-1) data from Atacama Large Millimetre/Su...
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Wiley
2017-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2017/8416945 |
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| author | Jazeel H. Azeez Zamri Z. Abidin C.-Y. Hwang Zainol A. Ibrahim |
| author_facet | Jazeel H. Azeez Zamri Z. Abidin C.-Y. Hwang Zainol A. Ibrahim |
| author_sort | Jazeel H. Azeez |
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| description | We present an extensive analysis of the relationship between star formation rate surface density (∑SFR) and molecular gas surface density (∑H2) at sub-kpc scale in the elliptical galaxy Centaurus A (also known as NGC 5128) at the distance 3.8 Mpc. 12CO (J = 2-1) data from Atacama Large Millimetre/Sub-Millimetre Array SV data with very high resolution (2.9′′, 0.84′′), as well as 24 μm data from the Spitzer Space Telescope, were used. This is one of the first studies of the SF law on Centaurus A at this very high spatial resolution. The results showed a breakdown in star formation law with a 0.49±0.05 index relating ∑SFR and ∑H2 at 185 pc. A significant correlation exists between surface densities of molecular gas and SFR with very long depletion time (68 Gy). In addition we examined the spatially resolved relationship between velocity dispersion and star formation rate surface density for the outer disk of this galaxy and we found that the average velocity dispersion is equal to 11.78 km/s. The velocity dispersion of the molecular ISM for the outer disk is found to follow a power relation with the star formation rate surface density σ∝∑SFRβ, where β is the slope from the ordinary least square fitting. The value of β is about 1/n≈2.16±0.40 and n is the power law index of the star formation law. |
| format | Article |
| id | doaj-art-8408b023add34a8ebeddbb0881821dcf |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
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| series | Advances in Astronomy |
| spelling | doaj-art-8408b023add34a8ebeddbb0881821dcf2025-02-03T07:26:02ZengWileyAdvances in Astronomy1687-79691687-79772017-01-01201710.1155/2017/84169458416945Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMAJazeel H. Azeez0Zamri Z. Abidin1C.-Y. Hwang2Zainol A. Ibrahim3Physics Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, MalaysiaPhysics Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, MalaysiaGraduate Institute of Astronomy, National Central University, Chung-Li 32054, TaiwanPhysics Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, MalaysiaWe present an extensive analysis of the relationship between star formation rate surface density (∑SFR) and molecular gas surface density (∑H2) at sub-kpc scale in the elliptical galaxy Centaurus A (also known as NGC 5128) at the distance 3.8 Mpc. 12CO (J = 2-1) data from Atacama Large Millimetre/Sub-Millimetre Array SV data with very high resolution (2.9′′, 0.84′′), as well as 24 μm data from the Spitzer Space Telescope, were used. This is one of the first studies of the SF law on Centaurus A at this very high spatial resolution. The results showed a breakdown in star formation law with a 0.49±0.05 index relating ∑SFR and ∑H2 at 185 pc. A significant correlation exists between surface densities of molecular gas and SFR with very long depletion time (68 Gy). In addition we examined the spatially resolved relationship between velocity dispersion and star formation rate surface density for the outer disk of this galaxy and we found that the average velocity dispersion is equal to 11.78 km/s. The velocity dispersion of the molecular ISM for the outer disk is found to follow a power relation with the star formation rate surface density σ∝∑SFRβ, where β is the slope from the ordinary least square fitting. The value of β is about 1/n≈2.16±0.40 and n is the power law index of the star formation law.http://dx.doi.org/10.1155/2017/8416945 |
| spellingShingle | Jazeel H. Azeez Zamri Z. Abidin C.-Y. Hwang Zainol A. Ibrahim Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA Advances in Astronomy |
| title | Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA |
| title_full | Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA |
| title_fullStr | Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA |
| title_full_unstemmed | Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA |
| title_short | Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA |
| title_sort | star formation law at sub kpc scale in the elliptical galaxy centaurus a as seen by alma |
| url | http://dx.doi.org/10.1155/2017/8416945 |
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