E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] nor Hα emission lines. The existence of strong Balmer absorption lines indicates that E+A galaxies have experienced starburst within recent one Gyr. However, the lack of [OII] and Hα emission lines indicates that E+A galaxies do not have any on-going star formation. Therefore, E+A galaxies are i...

We have combined data from the NOAO Deep Wide-Field Survey in Boötes and the Spitzer Space Telescope to determine basic properties for sixteen optically “invisible” MIPS 24 μm (OIMS) and thirty-five optically “invisible” radio (OIRS) sources, including their spectral energy distributions (SED) and luminosities. Most OIMSs possess steep power-law SEDs over λrest = 1 − 10 μm, indicating the prese...

We present J-band (1.15 − 1.35μm) spectroscopy of a sample of nine galaxies showing some degree of LINER activity (classical LINERs, weak-[O i] LINERs and transition objects), together with H-band spectroscopy for some of them. A careful subtraction of the stellar continuum allows us to obtain reliable [Fe ii]1.2567μm/Paβ line ratios. We conclude that different types of LINERs (i.e., photoioniz...

We present the results of an intermediate-resolution (1.5 A) spectroscopic study of 17 X-ray luminous narrow emission-line galaxies previously identiied in the Cambridge-Cambridge ROSAT Serendipity Survey and the Einstein Extended Medium Sensitivity Survey. Emission-line ratios reveal that the sample is composed of ten Seyfert and seven starburst galaxies. Measured linewidths for the narrow H e...

The morphology and kinematics of the luminous blue starburst galaxy NGC 7673 are explored using the WIYN 3.5m telescope. Signs of a past kinematic disturbance are detected in the outer galaxy; the most notable feature is a luminous ripple located 1.55 arc minutes from the center of NGC 7673. Sub-arc second imaging in B and R filters also reveals red dust lanes and blue star clusters that deline...

Recently Umemura, Fukue, & Mineshige (1997) proposed the radiative avalanche fueling to active galactic nuclei; gas accretion is driven by radiation drag exerted by stellar radiation from circumnuclear starburst regions. This mechanism is also interesting in terms of starburst-AGN connections. We therefore present observational tests for the radiative avalanche fueling. Our tests, however, show...

Spectra have been obtained with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope for 20 sources in the Lockman Hole field of the SWIRE survey. The sample is divided between sources with indicators of an obscured AGN, based primarily on X-ray detections of optically-faint sources, and sources with indicators of a starburst, based on optical and near-infrared spectral energy distrib...

We present the first determination of the 15μm luminosity function of galaxies from the European Large Area ISO survey (ELAIS) southern fields. We have adopted a new criterion to separate the quiescent, non-evolving and the starburst, evolving populations based on the ratio of mid-infrared to optical luminosities. Strong evolution is suggested by our data for the starburst galaxy population, wh...

A model for gas outflows is proposed which simultaneously explains the correlations between the (i) equivalent width of low ionization and Lyα lines, (ii) outflow velocity, and (iii) star formation rate observed in Lyman Break Galaxies (LBGs). Our interpretation implies that LBGs host short-lived (30 ± 5 Myr) starburst episodes observed at different evolutionary phases. Initially, the starburst...

This paper summarizes the evidence of the ultraviolet properties of dust grains found in starburst galaxies. Observations of starburst galaxies clearly show that the 2175 Å feature is weak or absent. This can be the result of radiative transfer effects (mixing the dust and stars) or due to dust grains which do not have this feature. Spherical DIRTY radiative transfer models imply that it is not...