Kinematic, Structural and Composition Studies of the Interstellar and Intergalactic Media

Start year
1986
Organizational Unit

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    General
    Description

    The basic objective of the broject is to investigate the evolution of galaxies by deepening our understanding of the interaction between the insterstellar medium and the stars.The main technique which we use is the two-dimensional kinematic study of whole galaxies observed using our instrument:GHaFaS, a Fabry-Perot interferometer on the William Herschel Telescope of the ORM.

    We combine the data from GHaFaS with our own photometric imaging using ACAM on the same telescope, with a variety of sources of images in the infrared and ultraviolet, and with emission line maps en the radio and milimetre range to explore the effects, and the physical parameters which the determine the star formation rate and the mass function of the stars depending on the sites of their formation in galaxies.

    In the present phase of the project the dynamical aspects which we are e xploring are basically two: the resonant structure of discs and bars, and the effects of the zones of massive star formation on their surroundings via stellar winds and supernovae.In addition, in preparation for the exploration of galaxy formation in earlier epochs, we are studying how the interactions between galaxies stimulate and condition star formation within them before they merge. In the future these studies will be extended, methodically, in two directions: outwards to galaxies at increasing redshift, and inwards by applying our methods to the study of interstellar porcesse in the zones of massive star formation in the Local Group galaxy M33.

    We combine our research into galaxy kinematics with evolutionary aspects of galaxy discs based on precise observations of their surface brightness profiles, both in local galaxies and in galaxies at intermediate redshift. In order to make progress in this direction we are collaborating with colleagues at the Instituto de Astronomía de la UNAM (México) and the Laboratoire d'Astrophysique de Marseille (France) in the implementation of a new instrument, NEFER, which will be a high resolution Fabry-Perot module incorporated into OSIRIS on the GTC. We had successful inicial trials in December 2017, and commissioneed NEFER in March 2018 for use as a visitor instrument permanently on the GTC.

    1. The "Font-Beckman" method for analysing resonances in galaxies was shown to give very accurate results, comparing it with the "Tremaine-Weinberg" method using data from GHaFaS (WHT and MUSE (VLT)
    2. The profiles of Type III (antitruncated) S0 galaxies were measured at z = 0.6 (5 thousan dmillion years ago) for the first time. The "break radius" is the same as that of local galaxies, but its surface brightness is 1.6 magnitudes brighter.
    3. A new and greatly improved analysis of the Hubble Ultra-Deep Field gave an image with valid photometry down to 33 mag /arcsec squared, revealing the faint outskirts of it galaxies,.
    4. Comparing galaxies in interacting pairs with isolated galaxies it was shown that the star formation rate in the former is consistently enhanced and that this enhancement is common to the discs and the tidal tails
    5. The galaxy NGC 864 (CIG 86), apparently isolated, shows an asymmetric distribution of its hI. It was shown that this galaxy is truly isolated, and that HI accretion probably accounts for the asymmetry as well as the star formation in its stellar pseud-ring

    Related publications

    Statistical Properties of Highly Luminous HII Regions in the Interacting Zone of the Antennae Galaxies, and Comparison with the Molecular Cloud Component 2013IAUS..292..156F
    Internal kinematics and physical properties of HII regions in the Arp 270 system 2013IAUS..292..166Z
    Comparison of NIR and Hα emission from the HII regions of M100 2013IAUS..292..327C
    The Filling Factor-Radius Relation for 58 H II Regions across the Disk of NGC 6946 2013ApJ...765L..24C
    Hα kinematics of S4G spiral galaxies - I. NGC 864 2012MNRAS.427.2938E
    Stellar dynamics of blue compact galaxies. II. Further indications of a merger in ESO 338-IG04 2008A&A...479..725C
    Hα kinematics of the Spitzer Infrared Nearby Galaxies Survey - II 2008MNRAS.385..553D
    HVC's Favouring Star Forming Processes in galaxy discs: a basic calculation and some recent HI observations 2012EAS....56..323B
    Can gamma ray bursts be used as effective tracers of star formation to high Z? 2010MmSAI..81..460B
    The warm ionized medium in spiral galaxies 2009RvMP...81..969H
    The Role of Mergers in Galaxy Evolution 2008ChJAS...8...77B
    The kinematics of the quadrupolar nebula M 1-75 and the identification of its central star 2010A&A...519A..54S
    The Galaxy-wide Distributions of Mean Electron Density in the H II Regions of M51 and NGC 4449 2010ApJ...710L..44G
    The Galactic initial mass function: origin in the combined mass distribution functions of dust grains and gas clouds 2012MNRAS.419.1642C
    Spiral Inflow Feeding the Nuclear Starburst in M83, Observed in Hα Emission with the GHαFaS Fabry-Perot Interferometer 2008ApJ...675L..17F
    Radial distribution of near-UV flux in disc galaxies in the range 0 ⪉ z ⪉ 1 2009A&A...501..119A
    Pattern Speeds of Bars and Spiral Arms from Hα Velocity Fields 2009ApJ...704.1657F
    On the morphology of sigma-drop galaxies 2008A&A...485..695C
    On the Curvature of Dust Lanes in Galactic Bars 2009ApJ...706L.256C
    Multiple major outbursts from a restless luminous blue variable in NGC 3432 2010MNRAS.408..181P
    GHαFaS: Galaxy Hα Fabry-Perot System for the William Herschel Telescope 2008PASP..120..665H
    Explaining the Galactic Interstellar Dust Grain Size Distribution Function 2010AJ....139.1406C
    Discovery of ultra-compact nuclear rings in three spiral galaxies 2008A&A...478..403C
    Cosmic Evolution of Stellar Disk Truncations: From z~1 to the Local Universe 2008ApJ...684.1026A
    Color Profiles of Disk Galaxies since z ~ 1: Probing Outer Disk Formation Scenarios 2008ApJ...679L..69A
    An improved method for statistical studies of the internal kinematics of HII regions: the case of M83 2010MNRAS.407.2519B
    AINUR: Atlas of Images of NUclear Rings 2010MNRAS.402.2462C
    A Strong Dichotomy in S0 Disk Profiles between the Virgo Cluster and the Field 2012ApJ...744L..11E

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