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.
机构:
Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, BrazilUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
Dors, O. L., Jr.
Krabbe, Angela
论文数: 0引用数: 0
h-index: 0
机构:
Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, BrazilUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
Krabbe, Angela
Haegele, Guillermo F.
论文数: 0引用数: 0
h-index: 0
机构:
Natl Univ La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata, Argentina
Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, SpainUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
Haegele, Guillermo F.
Perez-Montero, Enrique
论文数: 0引用数: 0
h-index: 0
机构:
CSIC, Inst Astrofis Andalucia, E-18080 Granada, SpainUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
机构:
Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, BrazilUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
Dors, O. L., Jr.
Krabbe, Angela
论文数: 0引用数: 0
h-index: 0
机构:
Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, BrazilUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
Krabbe, Angela
Haegele, Guillermo F.
论文数: 0引用数: 0
h-index: 0
机构:
Natl Univ La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata, Argentina
Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, SpainUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil
Haegele, Guillermo F.
Perez-Montero, Enrique
论文数: 0引用数: 0
h-index: 0
机构:
CSIC, Inst Astrofis Andalucia, E-18080 Granada, SpainUniv Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP, Brazil