The interstellar medium and star formation in edge-on galaxies. I. NGC 891

Yim K.; Wong T.; Howk J.C.Van Der Hulst J.M.

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The interstellar medium and star formation in edge-on galaxies. I. NGC 891

机译：The interstellar medium and star formation in edge-on galaxies. I. NGC 891

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We analyze images of BIMA ~(12)CO (J = 1 → 0), Very Large Array Hi, and Spitzer 3.6 and 24 μmemission toward the edge-on galaxy NGC 891 and derive the radial and vertical distributions of gas and the radial distributions of stellar mass and recent star formation. We describe our method of deriving radial profiles for edge-on galaxies, assuming circular motion, and verify basic relationships between star formation rate (SFR) and gas and stellar content, and between the molecular-to-atomic ratio and hydrostatic midplane pressure that have been found in other galaxy samples. The Schmidt law index we find for the total gas (H_2 + H_i) is 0.85 ± 0.55, but the Schmidt law provides a poor description of the SFR in comparison to a model that includes the influence of the stellar disk. Using our measurements of the thickness of the gas disk and the assumption of hydrostatic equilibrium, we estimate volume densities and pressures as a function of radius and height in order to test the importance of pressure in controlling the -H_2/-H_i ratio. The gas pressure in two dimensions P(r, z) using constant velocity dispersion does not seem to correlate with the -H_2/-H_i ratio, but the pressure using varying velocity dispersion appears to correlate with the ratio. We test the importance of gravitational instability in determining the sites of massive star formation and find that the Q parameter using a radially varying gas velocity dispersion is consistent with self-regulation (Q ～ 1) over a large part of the disk.

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《The Astronomical journal》 |2011年第2期|48-1-48-17|共17页
作者
Yim K.; Wong T.; Howk J.C.Van Der Hulst J.M.;
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作者单位

Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, United States;

Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, Netherlands;

Astronomy Department, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801, United States;

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正文语种英语
中图分类天文学;
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Galaxies: Individual (NGC 891); Galaxies: ISM; Galaxies: Kinematics and dynamics; Stars: Formation;

The interstellar medium and star formation in edge-on galaxies. I. NGC 891

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