Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · astro-ph/0509649

Spitzer 70 and 160-micron Observations of the Extragalactic First Look Survey

D. T. Frayer·D. Fadda·L. Yan·F. R. Marleau·P. I. Choi·G. Helou·B. T. Soifer·P. N. Appleton·L. Armus·R. Beck·H. Dole·C. W. Engelbracht·F. Fang·K. D. Gordon·I. Heinrichsen·D. Henderson·T. Hesselroth·M. Im·D. M. Kelly·M. Lacy·S. Laine·W. B. Latter·W. Mahoney·D. Makovoz·F. J. Masci·J. E. Morrison·M. Moshir·A. Noriega-Crespo·D. L. Padgett·M. Pesenson·D. L. Shupe·G. K. Squires·L. J. Storrie-Lombardi·J. A. Surace·H. I. Teplitz·G. Wilson
View original source ↗Read source document ↗Export metadata ↓

Abstract

We present Spitzer 70um and 160um observations of the Spitzer extragalactic First Look Survey (xFLS). The data reduction techniques and the methods for producing co-added mosaics and source catalogs are discussed. Currently, 26% of the 70um sample and 49% of the 160um-selected sources have redshifts. The majority of sources with redshifts are star-forming galaxies at z<0.5, while about 5% have infrared colors consistent with AGN. The observed infrared colors agree with the spectral energy distribution (SEDs) of local galaxies previously determined from IRAS and ISO data. The average 160um/70um color temperature for the dust is Td~= 30+/-5 K, and the average 70um/24um spectral index is alpha~= 2.4+/-0.4. The observed infrared to radio correlation varies with redshift as expected out to z~1 based on the SEDs of local galaxies. The xFLS number counts at 70um and 160um are consistent within uncertainties with the models of galaxy evolution, but there are indications that the current models may require slight modifications. Deeper 70um observations are needed to constrain the models, and redshifts for the faint sources are required to measure the evolution of the infrared luminosity function.

Explore related subjects

astro-ph

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

D. T. Frayer, D. Fadda, L. Yan, F. R. Marleau, P. I. Choi, G. Helou, B. T. Soifer, P. N. Appleton, L. Armus, R. Beck, H. Dole, C. W. Engelbracht, F. Fang, K. D. Gordon, I. Heinrichsen, D. Henderson, T. Hesselroth, M. Im, D. M. Kelly, M. Lacy, S. Laine, W. B. Latter, W. Mahoney, D. Makovoz, F. J. Masci, J. E. Morrison, M. Moshir, A. Noriega-Crespo, D. L. Padgett, M. Pesenson, D. L. Shupe, G. K. Squires, L. J. Storrie-Lombardi, J. A. Surace, H. I. Teplitz, G. Wilson. 2005-09-21. Spitzer 70 and 160-micron Observations of the Extragalactic First Look Survey. https://doi.org/10.1086/498690

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Frame covariance of CMBR lensing in the exact 1+3 covariant radiation hierarchy

The exact $1+3$ covariant Boltzmann hierarchy for the cosmic microwave background contains acceleration, shear and vorticity couplings whose coefficients grow linearly in $\ell$. We show that all are the multipole form of the aberration operator in the photon Liouville equation. Under a change of threading, this operator shifts by the along-ray generator of a Lorentz boost. The acceleration coupling of $\ell$ to $\ell\pm1$ and the shear coupling of $\ell$ to $\ell\pm2$ are therefore frame-covariant descriptions of the same operator, related by an algebraic, pointwise relabelling of direction. With emitter and observer frames fixed, the observed sky is independent of the intermediate threading at every $\ell$. We derive this in $1+3$ covariant and gauge-invariant variables without constructing second-order gauge-invariant variables. The $O(ε^2\ell)$ content is gravitational lensing, as known in metric variables. Linearisation about a Friedmann--Lemaître--Robertson--Walker background removes these couplings, requiring lensing to be reinstated from the geodesic equation. Keeping the threading arbitrary makes frame covariance explicit and places observer aberration in the same operator. In the Newtonian threading we compute both halves of the deflection: the equivalence-principle contribution enters through aberration, while the spatial-curvature contribution arises from free streaming on perturbed spatial sections and reduces to the same operator. The lensing efficiency follows from the direction derivative. The angular-power-spectrum contribution is quartic in the potential: for a deflection statistically independent of the source, the two fourth-order terms carrying $\ell^2$ cancel where the spectrum is smooth on the deflection scale, and lensing redistributes power without adding ensemble variance.

astro-ph↗
arXiv2026

Cosmic Conundrums with Quantum Corrections

Darh energy was discovered over 25 years ago and we do not have an explanation of it. Dark matter comprises 95% of matter in the universe and we still don't know what it is. The Webb telescope has been finding fully formed galaxies with massive black holes millions of times the mass of the sun in the early universe and we don't have any explanation. A quantum density limitation will be used to solve these and other outstanding problems.

astro-ph↗
arXiv2026

On binary pulsars and the force of gravity

The energy-momentum budget of the astrophysical systems can be studied by the exact local conservation equation derived by Landau and Lifshitz. We show that a similar equation is valid for the Einstein-Cartan gravity. We reanalyze a binary pulsar system using the Landau-Lifshitz conservation equation and show that the orbital period change rate can be completely understood as a curvature backreaction process. Taking into account the detailed theoretical and observational research of relativistic binary pulsar systems, especially the system of Hulse and Taylor, we conclude that general relativity and astrophysical observations rule out the existence of gravitational radiation. We comment upon the LIGO GW events and their alternative explanation, as well as the recent pulsar timing arrays data.

astro-ph↗