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We investigate the properties of massive, dense clouds formed in a barred galaxy and their possible relation to star formation, performing a two-dimensional hydrodynamical simulation with the gravitational potential obtained from the 2Mass…

Astrophysics of Galaxies · Physics 2015-06-05 M. Nimori , A. Habe , K. Sorai , Y. Watanabe , A. Hirota , D. Namekata

We use new ALMA observations to investigate the connection between dense gas fraction, star formation rate, and local environment across the inner region of four local galaxies showing a wide range of molecular gas depletion times. We map…

Interarm star formation contributes significantly to a galaxy's star formation budget, and provides an opportunity to study stellar birthplaces unperturbed by spiral arm dynamics. Using optical integral field spectroscopy of the nearby…

Astrophysics of Galaxies · Physics 2016-08-17 K. Kreckel , G. A. Blanc , E. Schinnerer , B. Groves , A. Adamo , A. Hughes , S. Meidt

The relation is studied between occurrence of a regular chain of star complexes and superclouds in a spiral arm, and other properties of the latter. A regular string of star complexes is located in the north-western arm of M31; they have…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Yuri N. Efremov

We study the global SF law - the relation between gas and SFRs in a sample of 181 local galaxies with L_IR spanning almost five orders of magnitude, which includes 115 normal galaxies and 66 (U)LIRGs. We derive their atomic, molecular gas…

Astrophysics of Galaxies · Physics 2015-05-27 Lijie Liu , Yu Gao , Thomas R. Greve

(ABRIDGED) We use hydrodynamical simulations of disk galaxies to study relations between star formation and properties of the molecular interstellar medium (ISM). We implement a model for the ISM that includes low-temperature (T<10^4K)…

Astrophysics · Physics 2009-11-13 Brant Robertson , Andrey Kravtsov

We observe the almost edge-on (i $\sim$ 90 degrees) galaxy NGC 4302 using ALMA (CO) and VLA (H I) to measure the gas disk thickness for investigating the volumetric star formation law (SFL). The recent star formation rate (SFR) is estimated…

Astrophysics of Galaxies · Physics 2023-02-08 Kijeong Yim , Tony Wong , Richard J. Rand

In this paper, we present some correlations of neutral hydrogen HI gas and physical properties of galaxies to investigate the role of atomic gas in governing galaxy evolution. We build a HI-detected sample including 70 galaxies that are…

Astrophysics of Galaxies · Physics 2018-08-08 Zhimin Zhou , Hong Wu , Xu Zhou , Jun Ma

We study the Kennicutt-Schmidt star formation law and efficiency in the gaseous disk of the isolated galaxy CIG 96 (NGC 864), with special emphasis on its unusually large atomic gas (HI) disk (r_HI/r_25 = 3.5, r_25 = 1.'85). We present deep…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 D. Espada , J. C. Munoz-Mateos , A. Gil de Paz , J. Sabater , S. Boissier , S. Verley , E. Athanassoula , A. Bosma , S. Leon , L. Verdes-Montenegro , M. Yun , J. Sulentic

We present hydrodynamical models of the grand design spiral M51 (NGC 5194), and its interaction with its companion NGC 5195. Despite the simplicity of our models, our simulations capture the present day spiral structure of M51 remarkably…

Astrophysics of Galaxies · Physics 2015-05-14 C. L. Dobbs , C. Theis , J. E Pringle , M. R. Bate

We present the spatially-resolved observations of HCN J = 1 -- 0 emission in the nearby spiral galaxy M51 using the IRAM 30 m telescope. The HCN map covers an extent of $4\arcmin\times5\arcmin$ with spatial resolution of $28\arcsec$, which…

Astrophysics of Galaxies · Physics 2015-09-23 Hao Chen , Yu Gao , Jonathan Braine , Qiusheng Gu

We consider the formation of OB associations from two perspectives: (a) the fractional gas consumption in star formation,epsilon, per dynamical time scale t_dyn in a galaxy, and (b) the origin of the so-called Kennicutt-Schmidt law that the…

Astrophysics · Physics 2009-11-13 Frank H. Shu , Ronald J. Allen , Susana Lizano , Daniele Galli

Aside from the grand-design stellar spirals appearing in the disk of M81, a pair of stellar spiral arms situated well inside the bright bulge of M81 has been recently discovered by Kendall et al. (2008). The seemingly unrelated pairs of…

Astrophysics of Galaxies · Physics 2015-06-18 Chien-Chang Feng , Lien-Hsuan Lin , Hsiang-Hsu Wang , Ronald E. Taam

We revisit the main HI-to-stellar mass ratio (gas fraction) scaling relations, taking advantage of the HI spectral stacking technique to understand the dependence of gas content on the structural and star formation properties of nearby…

Astrophysics of Galaxies · Physics 2015-08-06 Toby Brown , Barbara Catinella , Luca Cortese , Virginia Kilborn , Martha P. Haynes , Riccardo Giovanelli

We have conducted a study of optical and HI properties of spiral galaxies (size, luminosity, H-alpha flux distribution, circular velocity, HI gas mass) to explore the role of gas stripping as a driver of morphological evolution in clusters.…

Astrophysics · Physics 2009-11-10 Nicole P. Vogt , Martha P. Haynes , Riccardo Giovanelli , Terry Herter

We compare atomic gas, molecular gas, and the recent star formation rate (SFR) inferred from H-alpha in the Small Magellanic Cloud (SMC). By using infrared dust emission and local dust-to-gas ratios, we construct a map of molecular gas that…

We study the far-infrared emission from the nearby spiral galaxy M33 in order to investigate the dust physical properties such as the temperature and the luminosity density across the galaxy. Taking advantage of the unique wavelength…

What role does Galactic structure play in star formation? We have used the Herschel Hi-GAL compact-clump catalogue to examine trends in evolutionary stage over large spatial scales in the inner Galaxy. We examine the relationship between…

Astrophysics of Galaxies · Physics 2018-07-11 S. E. Ragan , T. J. T. Moore , D. J. Eden , M. G. Hoare , J. S. Urquhart , D. Elia , S. Molinari

(Abridged) In this second paper of the series, we present the results from optical Gemini-North GMOS-IFU and WIYN DensePak IFU spectroscopic observations of the starburst and inner wind zones of M82, with a focus on the state of the T~10^4…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 M. S. Westmoquette , J. S. Gallagher , L. J. Smith , G. Trancho , N. Bastian , I. S. Konstantopoulos

We report adaptive optics H- and K-band spectroscopy of the inner few arcsec of the luminous merger/ULIRG/QSO Mkn231, at spatial resolutions as small as 0.085". For the first time we have been able to resolve the active star forming region…

Astrophysics · Physics 2009-11-10 R. I. Davies , L. J. Tacconi , R. Genzel