Far-infrared flux densities are newly extracted from the IRAS database for the RSA and CfA complete samples of Seyfert galaxies. These data are used to classify the Seyfert galaxies into those where the far-infrared continuum emission is dominated by the active galactic nucleus (AGN), circumnuclear starburst, or host galaxy. While AGN-dominant objects consist of comparable numbers of Seyfert 1 ...

In a previous paper (Falkenberg, Kotulla & Fritze 2009, astro-ph/0901.1665) we have shown that the classical definition of E+A galaxies excludes a significant number of post-starburst galaxies. We suggested that analysing broad-band spectral energy distributions (SEDs) is a more comprehensive method to select and distinguish poststarburst galaxies than the classical definition of measuring equi...

We analyse the spectral energy distributions (SEDs) of 23 submm galaxies and 3 ISOdetected EROs, all of which have the spectroscopic redshifts, by using an evolutionary SED model of starbursts. This SED model allows us to investigate intrinsic properties of starbursts, such as the starburst age and the mean stellar metallicity, as it takes into account the chemical evolution. Also, the intrinsi...

We present near-infrared spectra for a sample of galaxies with ambiguous optical emission line ratios. These galaxies fall between starbursts and Seyferts in the usual optical diagnostic diagrams. We find a similar result with the near-infrared emission line ratios, which suggests that the galaxies are composite, containing both a starburst and AGN component. Furthermore, CO absorption, produce...

E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] or Hα emission lines. The existence of strong Balmer absorption lines means that E+A galaxies have experienced a starburst within the last <1-1.5 Gyr. However, the lack of [OII] or Hα emission lines indicates that E+A galaxies do not have any on-going star formation. Therefore, E+A galaxies are ...

E+A galaxies are characterized as galaxies with strong Balmer absorption lines but without any [O II] or Hα emission lines. The existence of strong Balmer absorption lines means that E+A galaxies have experienced a starburst within the last <1–1.5 Gyr. However, the lack of [O II] or Hα emission lines indicates that E+A galaxies do not have any ongoing star formation. Therefore, E+A galaxies are...

Blue Compact Dwarf (BCD) galaxies are metal poor systems going through a major starburst that cannot last for long. We have identified galaxies which may be BCDs during quiescence (QBCD), i.e., before the characteristic starburst sets in or when it has faded away. These QBCD galaxies are assumed to be like the BCD host galaxies. The SDSS/DR6 database provides ∼21500 QBCD candidates. We also sel...

1. E+A Mystery E+A galaxies are galaxies with strong Balmer absorption lines and with no significant emission in [OII] or Hα lines. The existence of strong Balmer absorption lines shows that these galaxies have experienced a starburst within the last 1 Gyr. At the same time, these galaxies do not show any sign of ongoing star formation as indicated by the lack of [OII] or Hα emission lines. The...

Based on new ISO mid-infrared observations and ground based Hα and near-infrared observations, we report the detection of a bright starburst in the intragroup medium (IGM) of the famous compact group of galaxies Stephan’s Quintet (Source A in Fig.1). We demonstrate that this starburst is caused by a collision between a high velocity (δV∼ 1000 km/sec) intruder galaxy (NGC7318b) and the IGM of th...

The nature of the starburst phenomenon in galaxies is investigated using a narrow band color system designed to study color evolution in distant clusters. Work on zero redshift, luminous far-IR galaxies, calibrated by starburst models, demonstrates the usefulness of this color system in isolating starburst from normal star-forming colors, and also demonstrates a strong correlation with far-IR c...