Galaxy interactions increase star formation rates

Bibcode
2015hsa8.conf..240K
Knapen, J. H.; Cisternas, M.; Querejeta, M.
Bibliographical reference

Highlights of Spanish Astrophysics VIII, Proceedings of the XI Scientific Meeting of the Spanish Astronomical Society held on September 8-12, 2014, in Teruel, Spain, ISBN 978-84-606-8760-3. A. J. Cenarro, F. Figueras, C. Hernández-Monteagudo, J. Trujillo Bueno, and L. Valdivielso (eds.), p. 240-244

Advertised on:
5
2015
Number of authors
3
IAC number of authors
2
Citations
0
Refereed citations
0
Description
We investigate the influence of galaxy-galaxy interactions on the star formation by studying a sample of almost 1500 of the nearest galaxies, all within a distance of 40 Mpc. We calculate the relative enhancement of the massive star formation rate (SFR), as measured from far-IR emission, and the specific star formation rate (SSFR), which is the former quantity normalised by the stellar mass of the galaxy. We do this for each galaxy by normalising by the median SFR and SSFR values of individual control populations of similar non-interacting galaxies. We find that both the SFR and the SSFR are enhanced in interacting galaxies, and more so as the degree of interaction is higher. The increase is, however, moderate, reaching a maximum of a factor of 2.2 for the highest degree of interaction (mergers). We argue that this study based on a representative sample of nearby galaxies should be used to place strong constraints on studies based on samples of galaxies at larger distances, beyond the local Universe.
Type
Non-refereed

It may interest you

  • Non-refereed
    Einasto Gravitational Potentials have Difficulty to Hold Spherically Symmetric Stellar Systems with Cores
    It was known that an ideal spherically symmetric stellar system with isotropic velocities and an inner core cannot reside in a Navarro, Frenk, and White (NFW) gravitational potential. The incompatibility can be pinned down to the radial gradient of the NFW potential in the very center of the system, which differs from zero. The gradient is
    Sánchez Almeida, Jorge

    Advertised on:

    6
    2024
    Bibcode
    2024RNAAS...8..167S
    Citations
    0
  • Non-refereed
    The Aligned Orbit of a Hot Jupiter around the M Dwarf TOI-4201
    Measuring the obliquities of stars hosting giant planets may shed light on the dynamical history of planetary systems. Significant efforts have been made to measure the obliquities of FGK stars with hot Jupiters, mainly based on observations of the Rossiter–McLaughlin effect. In contrast, M dwarfs with hot Jupiters have hardly been explored because
    Gan, Tianjun et al.

    Advertised on:

    7
    2024
    Bibcode
    2024ApJ...969L..24G
  • Non-refereed
    ROSALIA: ROman Sky Analyst for Low surface brightness Imaging & Astronomy
    Diffuse emission in the outskirts of galaxies, such as stellar tidal streams, galaxy stellar halos and intracluster light, provides important constraints on the structure and evolution of the Universe. However, such low surface brightness diffuse emission can be up to thousands of times dimmer (>29 AB mag/[square arcseconds]) than the sky
    Laine, Seppo et al.

    Advertised on:

    6
    2024
    Bibcode
    2024AAS...24412902L
    Citations
    0