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Observations of six luminous blue compact galaxies (BCGs) and two star forming companion galaxies were carried out with the CIGALE scanning Fabry-Perot interferometer attached to the ESO 3.6m telescope on La Silla. The observations were…

Astrophysics · Physics 2016-08-30 G. Östlin , P. Amram , J. Masegosa , N. Bergvall , J. Boulesteix

The stellar velocity dispersion, $\sigma$, is a quantity of crucial importance for spiral galaxies, where it enters fundamental dynamical processes such as gravitational instability and disc heating. Here we analyse a sample of 34 nearby…

Astrophysics of Galaxies · Physics 2019-09-25 Keoikantse Moses Mogotsi , Alessandro B. Romeo

We have conducted an HI 21 cm emission-line survey of six loose groups of galaxies chosen to be analogs to the Local Group. The survey was conducted using the Parkes Multibeam instrument and the Australia Telescope Compact Array (ATCA) over…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 D. J. Pisano , D. G. Barnes , L. Staveley-Smith , B. K. Gibson , V. A. Kilborn , K. C. Freeman

We investigate the distribution of central velocity dispersions for quiescent galaxies in the SDSS at $0.03 \leq z \leq 0.10$. To construct the field velocity dispersion function (VDF), we construct a velocity dispersion complete sample of…

Astrophysics of Galaxies · Physics 2017-08-23 Jubee Sohn , H. Jabran Zahid , Margaret J. Geller

A sample of 69 galaxies with radial velocities less than 2500 km/s was selected from the HI Parkes All Sky Survey (HIPASS) and imaged in broad band B and R and narrow band H-alpha to deduce details about star formation in nearby disk…

Astrophysics · Physics 2009-11-10 J. F. Helmboldt , R. A. M. Walterbos , G. D. Bothun , K. O'Neil , W. J. G. de Blok

This study is a part of the Cosmicflows-4 project with the aim of measuring the distances of more than ~10,000 spiral galaxies in the local universe up to ~15,000 km/s. New HI linewidth information has come primarily from the Arecibo Legacy…

We present first results of the study of a set of exceptional HI sources identified in the 40% ALFALFA extragalactic HI survey catalog alpha.40 as being both HI massive (M_HI > 10^10 Msun) and having high gas fractions for their stellar…

We use Fabry-Perot Halpha spectroscopy, complemented with published HI radio synthesis observations to derive high resolution rotation curves of spiral galaxies. We investigate precisely their inner mass distribution and compare it to CDM…

Astrophysics · Physics 2007-05-23 Sebastien Blais-Ouellette , Claude Carignan , Philippe Amram

We present an analysis of the velocity space of a sample of globular clusters (GC) with absolute proper motions. The vertical component of the velocity is found to be correlated with luminosity and galactocentric radius. We divided the…

Astrophysics · Physics 2007-05-23 E. J. Alfaro , A. J. Delgado , M. A. Gomez-Flechoso , F. Ferrini , I. Castro

This is the second paper of two reporting results from a study of the HI content and stellar properties of nearby galaxies detected by the Arecibo Legacy Fast ALFA blind 21-cm line survey and the Sloan Digital Sky Survey in a 2160 deg^2…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 M. C. Toribio , J. M. Solanes , R. Giovanelli , M. P. Haynes , A. Martin

The recently initiated Arecibo Legacy Fast ALFA (ALFALFA) survey aims to map 7000 square degrees of the high galactic latitude sky visible from Arecibo, providing a HI line spectral database covering the redshift range between -1600 km/s…

Astrophysics · Physics 2008-11-26 Riccardo Giovanelli , Martha P. Haynes , Brian R. Kent

We resolve spatially the star formation history of 300 nearby galaxies from the CALIFA integral field survey to investigate: a) the radial structure and gradients of the present stellar populations properties as a function of the Hubble…

Using published data, we have compiled the circular velocity (Vc) distribution function (VDF) of galaxy satellites in the Local Group. We find that within the volumes of radius of 570 kpc (400/h kpc for h=0.7) centered on the Milky Way and…

Astrophysics · Physics 2008-11-26 Anatoly A. Klypin , Andrey V. Kravtsov , Octavio Valenzuela , Francisco Prada

While studies of gas-phase metallicity gradients in disc galaxies are common, very little has been done in the acquisition of stellar abundance gradients in the same regions. We present here a comparative study of the stellar metallicity…

We use the rotation curves of more than 100 disk galaxies to examine whether the structure of their surrounding dark halos is consistent with the universal density profile proposed by Navarro, Frenk & White (NFW profiles). Rotation curve…

Astrophysics · Physics 2007-05-23 Julio F. Navarro

We combined two-dimensional kinematic and morphology information on the Halpha emission, obtained using near-infrared integral field spectroscopy, with broad-band photometry to investigate the dynamical structure and the physical properties…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 M. Lemoine-Busserolle , F. Lamareille

We investigate the evolution of the galaxy stellar mass function at high-redshift ($z\ge 5$) using a pair of large cosmological hydrodynamical simulations: {\em MassiveBlack} and {\em MassiveBlack-II}. By combining these simulations we can…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Stephen M. Wilkins , Tiziana Di Matteo , Rupert Croft , Nishikanta Khandai , Yu Feng , Andrew Bunker , William Coulton

The velocity structure imprinted in the H{\alpha} emission line profiles contains valuable information about galactic outflows. Using a set of high-resolution zoom-in cosmological simulations of galaxies at z=2, we generate H{\alpha}…

Astrophysics of Galaxies · Physics 2016-07-27 Daniel Ceverino , Santiago Arribas , Luis Colina , Bruno Rodriguez Del Pino , Avishai Dekel , Joel Primack
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