Ionizing stellar population in the disc of NGC 3310-I. The impact of a minor merger on galaxy evolution

被引:14
作者
Miralles-Caballero, D. [1 ]
Diaz, A. I. [1 ]
Rosales-Ortega, F. F. [2 ]
Perez-Montero, E. [3 ]
Sanchez, S. F. [3 ,4 ]
机构
[1] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain
[2] Inst Nacl Astrofis Opt & Electr, Puebla 72840, Mexico
[3] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain
[4] Ctr Astron Hispano Aleman, E-04004 Almeria, Spain
关键词
techniques: spectroscopic; ISM: abundances; H-II regions; galaxies: evolution; galaxies: starburst; galaxies: stellar content; H-II REGIONS; INTEGRAL-FIELD SPECTROSCOPY; STAR-FORMING REGIONS; DIGITAL SKY SURVEY; POTSDAM MULTIAPERTURE SPECTROPHOTOMETER; PRIMORDIAL HELIUM ABUNDANCE; EXTRAGALACTIC HII-REGIONS; MASS-METALLICITY RELATION; EMISSION-LINE SPECTRA; OXYGEN ABUNDANCE;
D O I
10.1093/mnras/stu435
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Numerical simulations of minor mergers predict little enhancement in the global star formation activity. However, it is still unclear the impact they have on the chemical state of the whole galaxy and on the mass build-up in the galaxy bulge and disc. We present a two-dimensional analysis of NCG 3310, currently undergoing an intense starburst likely caused by a recent minor interaction, using data from the PPAK Integral Field Spectroscopy Nearby Galaxies Survey (PINGS). With data from a large sample of about a hundred HII regions identified throughout the disc and spiral arms, we derive, using strong-line metallicity indicators and direct derivations, a rather flat gaseous abundance gradient. Thus, metal mixing processes occurred, as in observed galaxy interactions. Spectra from PINGS data and additional multi-wavelength imaging were used to perform a spectral energy distribution fitting to the stellar emission and a photoionization modelling of the nebulae. The ionizing stellar population is characterized by single populations with a narrow age range (2.5-5 Myr) and a broad range of masses (10(4)-6 x 10(6) M-circle dot). The effect of dust grains in the nebulae is important, indicating that 25-70 per cent of the ultraviolet photons can be absorbed by dust. The ionizing stellar population within the HII regions represents typically a few per cent of the total stellar mass. This ratio, a proxy to the specific star formation rate, presents a flat or negative radial gradient. Therefore, minor interactions may indeed play an important role in the mass build-up of the bulge.
引用
收藏
页码:2265 / 2289
页数:25
相关论文
共 158 条
  • [31] HYDROGEN ABSORPTION-LINE PROFILES OF IONIZING STAR-CLUSTERS
    DIAZ, AI
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1988, 231 (01) : 57 - 67
  • [32] The metal abundance of circumnuclear star-forming regions in early-type spirals.: Spectrophotometric observations
    Diaz, Angeles I.
    Terlevich, Elena
    Castellanos, Marcelo
    Hagale, Guillermo F.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 382 (01) : 251 - 269
  • [33] Resolving the stellar populations in the circumnuclear ring of NGC 7469
    Diaz-Santos, T.
    Alonso-Herrero, A.
    Colina, L.
    Ryder, S. D.
    Knapen, J. H.
    [J]. ASTROPHYSICAL JOURNAL, 2007, 661 (01) : 149 - 164
  • [34] NEW STRONG-LINE ABUNDANCE DIAGNOSTICS FOR H II REGIONS: EFFECTS OF κ-DISTRIBUTED ELECTRON ENERGIES AND NEW ATOMIC DATA
    Dopita, Michael A.
    Sutherland, Ralph S.
    Nicholls, David C.
    Kewley, Lisa J.
    Vogt, Frederic P. A.
    [J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2013, 208 (01)
  • [35] Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
    Dors, O. L., Jr.
    Krabbe, Angela
    Haegele, Guillermo F.
    Perez-Montero, Enrique
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2011, 415 (04) : 3616 - 3626
  • [36] DOTTORI HA, 1981, ASTRON ASTROPHYS, V102, P245
  • [37] A minor merger origin for stellar inner discs and rings in spiral galaxies
    Eliche-Moral, M. C.
    Gonzalez-Garcia, A. C.
    Balcells, M.
    Aguerri, J. A. L.
    Gallego, J.
    Zamorano, J.
    Prieto, M.
    [J]. ASTRONOMY & ASTROPHYSICS, 2011, 533
  • [38] Galaxy pairs in the Sloan Digital Sky Survey. I. Star formation, active galactic nucleus fraction, and the luminosity/mass-metallicity relation
    Ellison, Sara L.
    Patton, David R.
    Simard, Luc
    McConnachie, Alan W.
    [J]. ASTRONOMICAL JOURNAL, 2008, 135 (05) : 1877 - 1899
  • [39] A fractal origin for the mass spectrum of interstellar clouds. II. Cloud models and power-law slopes
    Elmegreen, BG
    [J]. ASTROPHYSICAL JOURNAL, 2002, 564 (02) : 773 - 781
  • [40] Multiple ionization sources in H ii regions and their effect on derived nebular abundances
    Ercolano, B.
    Wesson, R.
    Bastian, N.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 401 (02) : 1375 - 1380