Kennicutt-Schmidt Law in the Central Region of NGC 4321 as Seen by ALMA.

Jazeel H Azeez,C.-Y Hwang,Zainol A Ibrahim,Zamri Z Abidin

doi:10.1038/srep26896

Jazeel H Azeez, C.-Y Hwang + Show 2 more

Open Access

https://doi.org/10.1038/srep26896

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Journal: Scientific Reports	Publication Date: Jun 1, 2016
Citations: 13	License type: CC BY 4.0

Affiliation: University of Malaya, Nahrain University

Abstract

We present the Atacama Large Millimeter/Sub-millimeter Array (ALMA) cycle-0 science verification data of the CO(1–0) line emission in the central region of NGC 4321 (also known as M100) at the distance of 17.1 Mpc and VLA, L-band data of HI of the same galaxy. We have drawn the center area of M100 in the 12CO(J = 1–0) line with the resolution of (3.87″ × 2.53″) as viewed by ALMA, along with HI and Spitzer 8 and 3.6 μm data. The relationship between the surface density of molecular gas mass ∑H2 and that of star formation rate ∑SFR has been investigated, in addition to the relationship between the surface density of the neutral atomic hydrogen mass and that of ∑SFR (Kennicutt–Schmidt law) in this galaxy with a high spatial resolution. The results indicate that a significant correlation exists between the SFR surface density and the molecular gas mass density in the ~2 kpc region. The power-law index has been determined for three regions: center, upper and lower arms. The value of this index in the center region is 1.13, which follows the traditional (K-S) law and indicates that the molecular gas is affected by star formation.

Highlights

We present the Atacama Large Millimeter/Sub-millimeter Array (ALMA) cycle-0 science verification data of the CO(1–0) line emission in the central region of NGC 4321 at the distance of 17.1 Mpc and Very Large Array (VLA), L-band data of HI of the same galaxy
The results indicate that a significant correlation exists between the star formation (SFR) surface density and the molecular gas mass density in the ~2 kpc region
The later emerges from the west and it splits up into two armlets that meet at approximately r = 6′′, disappear and show up in the north

Summary

Introduction

The results indicate that a significant correlation exists between the SFR surface density and the molecular gas mass density in the ~2 kpc region. The value of this index in the center region is 1.13, which follows the traditional (K-S) law and indicates that the molecular gas is affected by star formation.

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Results

Conclusion