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We analyze H$\alpha$ images and long-slit spectra of samples of normal and starburst galaxies to better understand the nature of the diffuse, low-surface-brightness gas in these galaxies. We find that in both samples there is a strong…

Astrophysics · Physics 2016-08-30 Jing Wang , Timothy M. Heckman , Matthew D. Lehnert

We investigate the spatially-resolved star formation relation using a galactic disk formed in a comprehensive high-resolution (3.8 pc) simulation. Our new implementation of stellar feedback includes ionizing radiation as well as supernova…

Astrophysics of Galaxies · Physics 2018-03-12 Ji-hoon Kim , Mark R. Krumholz , John H. Wise , Matthew J. Turk , Nathan J. Goldbaum , Tom Abel

Using IRAM 30m, SEST 15m, and Nancay radiotelescopes, we have gathered the 1mm continuum emission, spectra of the J=1--0 CO line and of the HI line at 21cm for two samples of IRAS galaxies. Using these data, we have estimated the HI masses,…

Astrophysics · Physics 2016-08-30 Paola Andreani , Fabienne Casoli , Maryvonne Gerin

We present an analysis of the relation between star formation rate (SFR) surface density (sigmasfr) and mass surface density of molecular gas (sigmahtwo), commonly referred to as the Kennicutt-Schmidt (K-S) relation, at its intrinsic…

Astrophysics of Galaxies · Physics 2015-05-20 Viviana Casasola , Leslie Hunt , Francoise Combes , Santiago Garcia-Burillo

We study the relationship between the gas column density (Sigma_HI) and the star formation rate surface density (Sigma_SFR) for a sample of extremely small (M_B ~ -13, Delta V_50 ~ 30 km/s) dwarf irregular galaxies. We find a clear…

Cosmology and Nongalactic Astrophysics · Physics 2014-09-04 Sambit Roychowdhury , Jayaram N. Chengalur , Serafim S. Kaisin , Ayesha Begum , Igor D. Karachentsev

We develop a model for regulation of galactic star formation rates Sigma_SFR in disk galaxies, in which ISM heating by stellar UV plays a key role. By requiring simultaneous thermal and (vertical) dynamical equilibrium in the diffuse gas,…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Eve C. Ostriker , Christopher F. McKee , Adam K. Leroy

Dense, cold gas is the key ingredient for star formation. Over the last two decades, HCN(1-0) emission has been utilised as the most accessible dense gas tracer to study external galaxies. We present new measurements tracing the…

We examine the hypothesis that hydrostatic pressure alone determines the ratio of atomic to molecular gas averaged over a particular radius in disk galaxies. The hypothesis implies that the transition radius, the location where the ratio is…

Astrophysics · Physics 2009-11-10 Leo Blitz , Erik Rosolowsky

A distance-limited sample of 869 objects from the Updated Nearby Galaxy Catalog is used to characterize the star formation status of the Local Volume population. We present a compiled list of 1217 star formation rate (SFR) estimates for 802…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-16 Igor D. Karachentsev , Elena I. Kaisina

We present evidence that nearly half of the dwarf spheroidal galaxies (dSph and dSph/dIrr) in the Local Group are associated with large reservoirs of atomic gas, in some cases larger than the stellar mass. The gas is sometimes found at…

Astrophysics · Physics 2009-10-31 Leo Blitz , Timothy Robishaw

This study examines the resolved Kennicutt Schmidt (rKS) relation, defined as the connection between the star formation rate surface density (Sigma SFR) and the molecular gas mass surface density (Sigma H2) in the high-density central…

Astrophysics of Galaxies · Physics 2025-09-17 K Sruthi , Sreeja S Kartha , Blesson Mathew , K. Ujjwal , Akhil Krishna R , Shankar Ray

The atomic hydrogen (HI) properties of star-forming galaxies in the local Universe are known to correlate with other galaxy properties via the ``HI scaling relations''. The redshift evolution of these relations serves as an important…

Cosmology and Nongalactic Astrophysics · Physics 2023-09-14 Apurba Bera , Nissim Kanekar , Jayaram N. Chengalur , Jasjeet S. Bagla

We investigate the metallicity dependence of HI surface densities in star-forming regions along many lines of sight within 70 nearby galaxies, probing kpc to 50 pc scales. We employ HI, SFR, stellar mass, and metallicity (gradient)…

Astrophysics of Galaxies · Physics 2018-08-08 Andreas Schruba , Shmuel Bialy , Amiel Sternberg

We present deep H-band surface photometry and analysis of 40 Local Volume galaxies, a sample primarily composed of dwarf irregulars in the Cen A group, obtained using the IRIS2 detector at the 3.9m Anglo-Australian Telescope. We probe to a…

Astrophysics of Galaxies · Physics 2014-08-14 T. Young , H. Jerjen , Á. R. López-Sánchez , B. S. Koribalski

Based on sensitive CO measurements from HERACLES and HI data from THINGS, we show that the azimuthally averaged radial distribution of the neutral gas surface density (Sigma_HI + Sigma_H2) in 33 nearby spiral galaxies exhibits a…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 F. Bigiel , L. Blitz

We investigate the relation between star formation rate (SFR) and gas surface densities in Galactic star forming regions using a sample of YSOs and massive clumps. Our YSO sample consists of objects located in 20 molecular clouds from the…

Astrophysics of Galaxies · Physics 2015-05-19 Amanda Heiderman , Neal J. Evans , Lori E. Allen , Tracy Huard , Mark Heyer

We present a detailed description of a phenomenological H2 formation model and local star formation prescription based on the density of molecular (rather than total) gas. Such approach allows us to avoid the arbitrary density and…

Cosmology and Nongalactic Astrophysics · Physics 2011-01-28 Nickolay Y. Gnedin , Andrey V. Kravtsov

We introduce a method to estimate the HI mass within the optical radius of disk galaxies from integrated HI spectra, with an uncertainty of 0.09 dex. We use these estimates to study how inner HI fuels star formation in late-type disk…

Astrophysics of Galaxies · Physics 2020-02-26 Jing Wang , Barbara Catinella , Amelie Saintonge , Zhizheng Pan , Paolo Serra , Li Shao

We derive observed Halpha and R band luminosity densities of an HI-selected sample of nearby galaxies using the SINGG sample to be l_Halpha' = (9.4 +/- 1.8)e38 h_70 erg s^-1 Mpc^-3 for Halpha and l_R' = (4.4 +/- 0.7)e37 h_70 erg s^-1 A^-1…

We study several versions of the Schmidt-Kennicutt (SK) relation obtained for isolated spiral galaxies in TreeSPH simulations run with the GADGET3 code including the novel MUlti-Phase Particle Integrator (MUPPI) algorithm for star formation…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Pierluigi Monaco , Giuseppe Murante , Stefano Borgani , Klaus Dolag
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