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Related papers: The $L - \sigma$ relation for massive bursts of st…

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We study the kinematic properties of the ambient ionized ISM and ionized gas outflows in a large and representative sample of local luminous and ultraluminous infrared galaxies (U/LIRGs) (58 systems, 75 galaxies), on the basis of integral…

Astrophysics of Galaxies · Physics 2014-09-05 Santiago Arribas , Luis Colina , Enrica Bellocchi , Roberto Maiolino , Montserrat Villar-Martin

We present a study of the stellar populations of a sample of 39 local, field early-type galaxies whose HI properties are known from interferometric data. Our aim is to understand whether stellar age and chemical composition depend on the HI…

Astrophysics · Physics 2009-11-13 Paolo Serra , Scott C. Trager , Tom A. Oosterloo , Raffaella Morganti

A group of four compact HII regions associated with the well-known 50 km/s molecular cloud is the closest site of on-going star formation to the dynamical center of the Galaxy, at a projected distance of ~6 pc. We present a study of ionized…

Astrophysics of Galaxies · Physics 2015-05-20 F. Yusef-Zadeh , J. H. Lacy , M. Wardle , B. Whitney , H. Bushouse , D. A. Roberts , R. G. Arendt

We present a comparison between ionized gas and stellar kinematics for a sample of 5 early-to-intermediate disc galaxies. We measured the major axis V and sigma radial profiles for both gas and stars, and the h3 and h4 radial profiles of…

We investigate the size--density relation in extragalactic HII regions, with the aim of understanding the role of dust and different physical conditions in the ionized medium. First, we compiled several observational data sets for Galactic…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 L. K. Hunt , H. Hirashita

We demonstrate that individual elliptical galaxies and clusters of galaxies form a continuous X-ray luminosity---velocity dispersion (LX-sigma) relation. Our samples of 280 clusters and 57 galaxies have LX ~ sigma^4.4 and LX ~ sigma^10,…

Astrophysics · Physics 2009-11-06 Andisheh Mahdavi , Margaret J. Geller

We use the first data release from the SINGG H-alpha survey of HI-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties represented by these 109 galaxies. The mean…

The gas-phase and stellar metallicities have proven to be important parameters to constrain the star formation history of galaxies. However, HII regions associated with recent star-formation may not have abundances typical for the galaxy as…

Cosmology and Nongalactic Astrophysics · Physics 2017-03-22 Celine Peroux , Varsha P. Kulkarni , Donald G. York

We present results for 19 "Lyman Break Analogs" (LBAs) observed with Keck/OSIRIS with an AO-assisted spatial resolution of less than 200 pc. We detect satellites/companions, diffuse emission and velocity shear, all with high signal-to-noise…

Semi-analytical models of galaxy formation can be used to predict the evolution of the number density of early-type galaxies as a function of the circular velocity at the virial radius, v_{c,vir}. Gravitational lensing probability and…

Astrophysics · Physics 2009-11-11 Kyu-Hyun Chae , Shude Mao , Xi Kang

We present near-infrared integral field spectroscopy of ten Herschel selected galaxies at z~1.5. From detailed mapping of the H$\alpha$ and [NII] emission lines we trace the dynamics, star formation rates, metallicities and also investigate…

Astrophysics of Galaxies · Physics 2015-06-19 R. J. Williams , R. Maiolino , P. Santini , A. Marconi , G. Cresci , F. Mannucci , D. Lutz

(Abridged) We present evidence that the HII regions of high luminosity in disk galaxies may be density bounded, so that a significant fraction of the ionizing photons emitted by their exciting OB stars escape from the regions. The key piece…

Astrophysics · Physics 2009-10-31 J. E. Beckman , M. Rozas , A. Zurita , R. A. Watson , J. H. Knapen

We study the relationship between the [CII] emission and the star formation rate (SFR) in the Galactic plane and separate the relationship of different ISM phases to the SFR. We compare these relationships to those in external galaxies and…

Astrophysics of Galaxies · Physics 2014-11-05 Jorge L. Pineda , William D. Langer , Paul F. Goldsmith

We develop a new method to determine the distance between a high-redshift galaxy and a foreground screen of atomic hydrogen. In a partially neutral universe, and assuming spherical symmetry, this equates to the radius of a ionized 'bubble'…

Astrophysics of Galaxies · Physics 2023-09-27 Matthew J. Hayes , Claudia Scarlata

The usage of the radius-luminosity (R-L) relation for the determination of black hole masses across the cosmic history as well as its application for cosmological studies motivates us to analyze its scatter, which has recently increased…

Astrophysics of Galaxies · Physics 2020-11-11 Mary Loli Martínez-Aldama , Michal Zajaček , Bożena Czerny , Swayamtrupta Panda

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 investigate if dust emission in the far-IR continuum provides a robust estimate of star formation rate (SFR) for a nearby, normal late-type galaxy. We focus on the ratio of the 40--1000 micron luminosity (L_dust) to the far-UV (0.165…

Astrophysics · Physics 2009-11-10 D. Pierini , C. S. Moeller

Star-forming galaxies (SFGs) adhere to a surprisingly tight scaling relation of dust attenuation parameterized by the infrared excess (IRX=$L_{\rm IR}/L_{\rm UV}$), being jointly determined by the star formation rate (SFR), galaxy size…

Astrophysics of Galaxies · Physics 2024-02-01 J. Qin , X. Z. Zheng , S. Wuyts , Z. Lv , M. Qiao , J. -S. Huang , F. S. Liu , A. Katsianis , V. Gonzalez , F. Bian , H. Xu , Z. Pan , W. Liu , Q. -H. Tan , F. X. An , D. D. Shi , Y. Zhang , R. Wen , S. Liu , C. Yang

We present the second data release for the HI-MaNGA programme of HI follow-up observations for the SDSS-IV MaNGA survey. This release contains measurements for 3669 unique galaxies, combining 2108 Green Bank Telescope observations with an…

We built a multi-wavelength dataset for galaxies from the Local Volume HI Survey (LVHIS), which comprises 82 galaxies. We also select a sub-sample of ten large galaxies for investigating properties in the galactic outskirts. The LVHIS…