The Effect of Increases in Labor Supply on Real Wages

The working class citizen is an important part of the United States. However, the manufacturing worker is getting paid less in real terms now, than in 1975. Because of this, working harder for less has become the battle cry of the blue collar worker. This study is focused on examining the decline in average real hourly wage in manufacturing. The hypothesis of this paper is that large increases in female labor force participation rates have caused average real wages to fall since 1966. This hypothesis is examined through multiple regression analysis based on a model with three independent variables. The regression takes into account business cycle, productivity, and labor supply variables. Through examination of the statistics, this paper finds a negative relationship between the average real hourly wage and increases in labor force participation rates. Furthermore, the paper examines the marginal revenue product theory of labor, by showing at times, factors other than those linked to labor demand can be influential in wage determination. This study is focused on the influence of labor supply on average real wage. It is a starting point for further examination into labor supply fluctuation. Furthermore, this study sets up a model for investigation into labor supply fluctuations of other countries

The Effect of Increases in Labor Supply on Real Wages

The working class citizen is an important part of the United States. However, the manufacturing worker is getting paid less in real terms now, than in 1975. Because of this, working harder for less has become the battle cry of the blue collar worker. This study is focused on examining the decline in average real hourly wage in manufacturing. The hypothesis of this paper is that large increases in female labor force participation rates have caused average real wages to fall since 1966. This hypothesis is examined through multiple regression analysis based on a model with three independent variables. The regression takes into account business cycle, productivity, and labor supply variables. Through examination of the statistics, this paper finds a negative relationship between the average real hourly wage and increases in labor force participation rates. Furthermore, the paper examines the marginal revenue product theory of labor, by showing at times, factors other than those linked to labor demand can be influential in wage determination. This study is focused on the influence of labor supply on average real wage. It is a starting point for further examination into labor supply fluctuation. Furthermore, this study sets up a model for investigation into labor supply fluctuations of other countries

FERENGI: Redshifting galaxies from SDSS to GEMS, STAGES and COSMOS

We describe the creation of a set of artificially "redshifted" galaxies in the range 0.1<z<1.1 using a set of ~100 SDSS low redshift (v<7000 km/s) images as input. The intention is to generate a training set of realistic images of galaxies of diverse morphologies and a large range of redshifts for the GEMS and COSMOS galaxy evolution projects. This training set allows other studies to investigate and quantify the effects of cosmological redshift on the determination of galaxy morphologies, distortions and other galaxy properties that are potentially sensitive to resolution, surface brightness and bandpass issues. We use galaxy images from the SDSS in the u, g, r, i, z filter bands as input, and computed new galaxy images from these data, resembling the same galaxies as located at redshifts 0.1<z<1.1 and viewed with the Hubble Space Telescope Advanced Camera for Surveys (HST ACS). In this process we take into account angular size change, cosmological surface brightness dimming, and spectral change. The latter is achieved by interpolating a spectral energy distribution that is fit to the input images on a pixel-to-pixel basis. The output images are created for the specific HST ACS point spread function and the filters used for GEMS (F606W and F850LP) and COSMOS (F814W). All images are binned onto the desired pixel grids (0.03" for GEMS and 0.05" for COSMOS) and corrected to an appropriate point spread function. Noise is added corresponding to the data quality of the two projects and the images are added onto empty sky pieces of real data images. We make these datasets available from our website, as well as the code - FERENGI: "Full and Efficient Redshifting of Ensembles of Nearby Galaxy Images" - to produce datasets for other redshifts and/or instruments.Comment: 11 pages, 10 figures, 3 table

Integral field spectroscopy of QSO host galaxies

We describe a project to study the state of the ISM in ~20 low redshift (z<0.3) QSO host galaxies observed with the PMAS integral field spectrograph. We describe method developement to access the stellar and gas component of the spectrum without the strong nuclear emission to access the host galaxy properties also in the central region. It shows that integral field spectroscopy promises to be very efficient to study the gas distribution and its velocity field, and also spatially resolved stellar population in the host galaxies also of luminous AGN.Comment: 4 pages, 6 figures, Euro3D Science Workshop, Cambridge, May 2003, AN, accepte

Host galaxies of bright high redshift quasars: Luminosities and colours

We present the results of a near-infrared imaging study of high redshift (z~3) quasars using the ESO-VLT. Our targets were selected to have luminosities among the highest known (absolute magnitude M_B <~ -28. We searched for resolved structures underlying the bright point-source nuclei by comparing the QSO images with stars located in the same fields. Two QSOs (HE2348-1444 at z=2.904 and HE2355-5457 at z=2.933) are clearly resolved in K_S, and with somewhat lower significance also in H; one object is resolved only in K_S. At these redshifts, H and K_S correspond almost exactlly to rest-frame B and V, respectively, with virtually no K-correction. We also report briefly the non-detection of some additional QSOs. The detected host galaxies are extremely luminous with M_V ~ -25. Their rest-frame B-V colours, however, are close to zero in the Vega system, indicating substantial contributions from young stars and a stellar mass-to-light ratio below 1 (in solar units). Tentatively converting M_V and B-V into rough estimates of stellar masses, we obtain values of M_star in the range of several 10^11 M_sun, placing them within the high-mass range of recent high-redshift galaxy surveys. We present optical spectra and use CIV line width measurements to predict virial black hole masses, obtaining typical values of M_bh ~ 5x10^9 M_sun. With respect to the known correlation between host galaxy luminosity L_V(host) and M_bh, our measurements reach to higher luminosities and redshifts than previous studies, but are completely consistent with them. Comparing our objects with the local (z~0) M_bh - M_bulge relation and taking also the low stellar mass-to-light ratios into account, we find tentative evidence for an excess in the M_bh/M_bulge mass ratio at z~3.Comment: 9 pages, 7 figures, accepted for publication in A&

Collections Data, Tools, and Strategy: Applying R, Tableau, and Excel to Print Assessment

As is the case at most academic libraries, collection assessment has become an essential component of collection management and development work. Although much of the assessment focus has disproportionately fallen on e-resources, print collections remain fruitful areas for evaluation and review. At Emory, print collections, including a complex approval plan, continue to be a significant component of our overarching collection strategy (in volume and expenditure). However, shifting priorities for library space and the growth of interdisciplinary programs and centers within the University are placing a higher demand on subject librarians for communication and coordinated decision-making regarding print acquisitions. As a result, we are currently preparing for a comprehensive print collection review, of which the approval plan is an integral component. This assessment will inform a more coherent print strategy, which effectively and efficiently meets research and teaching requirements as well as administrative needs. Using data cleaning and visualization tools, such as R, Excel, and Tableau, we have enriched our local usage data with detailed Gobi approval data (e.g., series, publisher, subject, etc.) and profile parameters. Merging these data types and enriching local use data will allow us to analyze the print collection in a more nuanced fashion and ask questions that do not require the LC classification framework. This analysis considers the development of additional tools and approaches that facilitate subject specialist communication with collection management and overall collaborative decision-making, especially in cross disciplinary areas

Gravitational lens candidates in the E-CDFS

We report ten lens candidates in the E-CDFS from the GEMS survey. Nine of the systems are new detections and only one of the candidates is a known lens system. For the most promising five systems including the known lens system, we present results from preliminary lens mass modelling, which tests if the candidates are plausible lens systems. Photometric redshifts of the candidate lens galaxies are obtained from the COMBO-17 galaxy catalog. Stellar masses of the candidate lens galaxies within the Einstein radius are obtained by using the $z$-band luminosity and the $V-z$ color-based stellar mass-to-light ratios. As expected, the lensing masses are found to be larger than the stellar masses of the candidate lens galaxies. These candidates have similar dark matter fractions as compared to lenses in SLACS and COSMOS. They also roughly follow the halo mass-stellar mass relation predicted by the subhalo abundance matching technique. One of the candidate lens galaxies qualifies as a LIRG and may not be a true lens because the arc-like feature in the system is likely to be an active region of star formation in the candidate lens galaxy. Amongst the five best candidates, one is a confirmed lens system, one is a likely lens system, two are less likely to be lenses and the status of one of the candidates is ambiguous. Spectroscopic follow-up of these systems is still required to confirm lensing and/or for more accurate determination of the lens masses and mass density profiles.Comment: 12 pages, 5 figures, 3 tables, ApJ accepte