Spitzer Mid-Infrared Spectroscopy: Detection of Polycyclic Aromatic Hydrocarbon Molecules in Ultraluminous Infrared Galaxies at z ~ 2
نویسنده
چکیده
This expectation is supported by the results of many observational studies with ISO, SCUBA, and now Spitzer, which provide evidence of strong evolution in number density and luminosity of dusty starbursts at z>1 (Elbaz et al. 2002; Chapman et al. 2003; Marleau et al. 2004; Yan et al. 2004; Le Floch et al. 2004). Therefore, high-z, dusty infrared luminous sources are believed to play a critical role in the formation and evolution of galaxies.
منابع مشابه
Spitzer Detection of PAH and Silicate Dust Features in the Mid - Infrared Spectra of z ∼ 2 Ultraluminous Infrared
We report the initial results from a Spitzer GO-1 program to obtain low resolution, mid-infrared spectra of infrared luminous galaxies at z ∼ 1 − 2. This paper presents the spectra of eight sources observed with the Spitzer InfraRed Spectrograph (IRS). Of the eight spectra, six have mid-IR spectral features, either emission from Polycyclic Aromatic Hydrocarbon (PAH) or silicate absorption. Base...
متن کاملSpitzer Mid-Infrared Imaging of Nearby Ultraluminous Infrared Galaxies
We have observed 14 nearby (z < 0.16) Ultraluminous Infrared Galaxies (ULIRGs) with Spitzer at 3.6—24μm. The underlying host galaxies are well-detected, in addition to the luminous nuclear cores. While the spatial resolution of Spitzer is poor, the great sensitivity of the data reveals the underlying galaxy merger remnant, and provides the first look at off-nuclear mid-infrared activity.
متن کاملThe Mid-Infrared Properties of Blue Compact Dwarf Galaxies
The unprecedented sensitivity of the Spitzer Space Telescope has enabled us for the first time to detect a large sample of Blue Compact Dwarf galaxies (BCDs), which are intrinsically faint in the infrared. In the present paper we present a summary of our findings which providing essential information on the presence/absence of the Polycyclic Aromatic Hydrocarbon features in metal-poor environme...
متن کاملThe hunt for red active galactic nuclei: a new infrared diagnostic
We introduce a new infrared diagnostic to separate galaxies on the basis of their dominant infrared emission: stellar or nuclear. The main novelty with respect to existing diagnostics is the use of a broad band encompassing at the same time the 9.7-μm silicate absorption feature and one of the adjacent broad polycyclic aromatic hydrocarbon (PAH) features. This provides a robust estimate of the ...
متن کاملSubarcsecond Resolution Mid-infrared Observations of Super Star Clusters in the Antennae (ngc4038/4039)
In this letter we present ground-based subarcsecond mid-infrared imaging and spectroscopy of young super star clusters in the overlap region of the merging galaxies NGC4038/4039 (the Antennae) obtained with the VLT Imager and Spectrometer for mid-Infrared (VISIR). With its unprecedented spatial resolution VISIR begins to resolve the H ii/PDR complexes around the star-forming regions for the fir...
متن کامل