Point source models for the gravitational lens B1608+656: Indeterminacy in the prediction of the Hubble constant

We apply elliptical isothermal mass models to reproduce the point source properties, i.e. image positions, flux density ratios and time delay ratios, of the quadruple lens B1608+656. A wide set of suitable solutions is found, showing that models that only fit the properties of point sources are under-constrained and can lead to a large uncertainty in the prediction of Ho. We present two examples of models predicting Ho=100 km/(s Mpc) (chi^2=4) and Ho=69 km/(s Mpc) (chi^2=24).Comment: 2 pages, 1 figure. To appear in "Gravitational Lensing: Recent Progress and Future Goals", Boston University, MA, July 1999, eds. T.G. Brainerd and C.S. Kochane

Modeling Galaxy Lenses

In order to use a gravitational lens to measure the Hubble constant accurately, it is necessary to derive a reliable model of the lens surface potential. If the analysis is restricted to the locations and magnifications of point images, the derived Hubble constant depends upon the class of mass models used to fit the data. However, when there is extended emission from an Einstein ring, it may be possible to derive a potential from the observed surface brightness in a model-independent manner. This procedure is illustrated with reference to B1608+656. The multi-band images are de-reddened, de-convolved and de-contaminated so that the luminous matter and the surface brightness contours in the Einstein ring are both faithfully mapped. This intensity distribution can then be used to reconstruct the potential. Progress in implementing this program is reported. The observed incidence of multiple-imaged galaxies on the Hubble Deep Fields is an order of magnitude smaller than naively predicted on the basis of radio lens surveys, like CLASS, but consistent with the rate computed using surface photometry of candidate lens galaxies assuming standard mass to light ratios. In order to resolve this paradox, it is suggested that most galaxy lenses are located in compact groups.Comment: Latex 10 pages 4 figures. To appear in ``Gravitational Lensing: Recent Progress and Future Goals'' Editors: Tereasa G. Brainerd and Christopher S. Kochane

Gravitational Lens B1608+656. I. V-, I-, and H‐Band Hubble Space Telescope Imaging

We present a multiwavelength analysis of high-resolution observations of the quadruple lens B1608+656 from the Hubble Space Telescope archive, acquired with WFPC2 through filters F606W (V band) and F814W (I band) and with NIC1 in filter F160W (H band). In the three bands, the observations show extended emission from the four images of the source in a ringlike configuration that surrounds the two resolved, ensing galaxies. B1608+656 was discovered as a double-lobed radio source and later identified as a poststarburst galaxy in the optical. Based on photometry and optical spectroscopy we estimate that the stellar population of the source has an age of ~500 Myr. This provides a model for the spectrum of the source that extends over spectral regions where no observations are available and is used to generate Tiny Tim point-spread functions (PSFs) for the filters. Deconvolutions performed with the Lucy-Richardson method are presented, and the limitations of these restorations are discussed. V-I and I-H color maps show evidence of extinction by dust associated with one of the lensing galaxies, a late-type galaxy presumably disrupted after its close encounter with the other lens, an elliptical galaxy. The extinction affects the two lens galaxies and two of the four multiple images. The diagnostic of wavelength-dependent effects in the images shows that corrections for contamination with light from the lenses, extinction, and PSF convolution need to be applied before using the extended structure in the images as a constraint on lens models. We will present the restoration of the images in a subsequent paper

BUSANA TARI BEDAYA GAYA YOGYAKARTA SEBUAH KAJIAN ESTETIKA

Nilai estetis yang terkandung pada tata busana dan tata rias tari bedaya secara visual terkait dengan karakter yang terdapat pada tari bedaya. Artinya penari bedaya yang edial semestinya dipilih kecuali dengan prnilaian kualitas kepenariannya, dan masih diperlukan persyaratan yang berkaitan dengan keserasian dan ketepatan seorang penari mengenakan dodol ageng dan rias paes ageng. Hal ini penting karena tidak semua penari yang baik dan sesuai penari bedaya bisa mengenakan busana dodot ageng dan rias paes ageng,karena ada persyaratan ketentuan fisik yang dapat memenuhi persyaratan keserasian dalam berbusana dodot ageng dan rias paes ageng. Nilai estetis yang terkandungdalam tata busana dan tata rias tari bedaya gaya Yogyakarta mempunyai kaitan erat dengan makna yang terkandung dalam tari bedaya dengan segala unsur yang terdapat di dalamnya. Sehingga apabila terjadi perubahan secara evolutif pada tata busana dan rias tari bedaya maka berarti ada kaitannya dengan makna yang terkandung pada tariannya

The Hubble Constant from the Gravitational Lens B1608+656

We present a refined gravitational lens model of the four-image lens system B1608+656 based on new and improved observational constraints: (i) the three independent time-delays and flux-ratios from VLA observations, (ii) the radio-image positions from VLBA observations, (iii) the shape of the deconvolved Einstein Ring from optical and infrared HST images, (iv) the extinction-corrected lens-galaxy centroids and structural parameters, and (v) a stellar velocity dispersion, sigma_ap=247+-35 km/s, of the primary lens galaxy (G1), obtained from an echelle spectrum taken with the Keck--II telescope. The lens mass model consists of two elliptical mass distributions with power-law density profiles and an external shear, totaling 22 free parameters, including the density slopes which are the key parameters to determine the value of H_0 from lens time delays. This has required the development of a new lens code that is highly optimized for speed. The minimum-chi^2 model reproduces all observations very well, including the stellar velocity dispersion and the shape of the Einstein Ring. A combined gravitational-lens and stellar dynamical analysis leads to a value of the Hubble Constant of H_0=75(+7/-6) km/s/Mpc (68 percent CL; Omega_m=0.3, Omega_Lambda=0.7. The non-linear error analysis includes correlations between all free parameters, in particular the density slopes of G1 and G2, yielding an accurate determination of the random error on H_0. The lens galaxy G1 is ~5 times more massive than the secondary lens galaxy (G2), and has a mass density slope of gamma_G1=2.03(+0.14/-0.14) +- 0.03 (68 percent CL) for rho~r^-gamma', very close to isothermal (gamma'=2). (Abridged)Comment: 17 pages, 6 figures, 5 tables; revised version with correct fig.6 and clarified text based on referee report; conclusions unchange

Galaxy-Galaxy Lensing by Non-Spherical Haloes I:Theoretical Considerations

We use Monte Carlo simulations to investigate the theory of galaxy-galaxy lensing by non-spherical dark matter haloes. The simulations include a careful accounting of the effects of multiple deflections. In a typical data set where the mean tangential shear of sources with redshifts zs ~ 0.6 is measured with respect to the observed symmetry axes of foreground galaxies with redshifts zl ~ 0.3, the signature of anisotropic galaxy-galaxy lensing differs substantially from the expectation that one would have in the absence of multiple deflections. The observed ratio of the mean tangential shears, g+/g-, is strongly suppressed compared to the function that one would measure if the intrinsic symmetry axes of the foreground galaxies were known. Depending upon the characteristic masses of the lenses, the observed ratio of the mean tangential shears may be consistent with an isotropic signal (despite the fact that the lenses are non-spherical), or it may even be reversed from the expected signal (i.e., the mean tangential shear for sources close to the observed minor axes of the lenses may exceed the mean tangential shear for sources close to the observed major axes of the lenses). These effects are caused primarily by the fact that the lens galaxies have, themselves, been lensed and therefore the observed symmetry axes of the lenses differ from their intrinsic symmetry axes. The effects of lensing of the foreground galaxies on the observed function g+/g- cannot be eliminated by the rejection of foreground galaxies with small image ellipticities, nor by focusing the analysis on sources that are located very close to the observed symmetry axes of the foreground galaxies. We conclude that any attempt to use a measurement of g+/g- to constrain the shapes of dark matter galaxy haloes must include Monte Carlo simulations that take multiple deflections properly into account.Comment: 15 pages, 17 figures, submitted to MNRAS, full manuscript with high-resolution version of Fig. 4 can be found at http://firedrake.bu.edu/preprints/preprints.htm

Śivagrha (Prambanan Temple) as an Archetype of Hindu Theology in Nusantara (An Endeavor to Discover Hindu Theological Knowledge through Ancient Temple Heritage)

Many scholars believe that the Hindu community in Nusantara worship Trimūrti (Brahmā, Visnu, and Śiva) equally. This opinion is shared among the experts. However, it is not prevalent within Hinduism. Hence, it contradicts the concept of Ista Devata (the glorification of one Devata among the others). This qualitative study examines Prambanan Temple as an Archetype of Hindu Theology in Nusantara. This study focusses on the structure of the Prambanan temple complex, which related to the concept of Hindu Nusantara Theology, the depiction of Hindu Nusantara Theology, and the special meaning of Prambanan Temple. Data analysis was carried out using an Ethnographic Content Analysis (ECA). This study concludes that Prambanan Temple is convincing as an Archetype of Hindu Theology, in two typologies. The typology of Nirguna Brahman lies in the concept where Prambanan is a place to worship Parabrahman, The Absolute, The Supreme God. Meanwhile, the typology of Saguna Brahman lies in the concept where Prambanan is a Śivagrha, The House of Lord Śiva, a place to worship Śiva as the Highest Gods. This typology of Saguna Brahman is the base of Śivaistik Theology. Prambanan temple construction uses the Vāstupurusamandala pattern, which made it as the grandest temple in Nusantara. Even though Śivagrha is popular as a temple complex to worship Tri Murti as equals, the fact which lies in temple structures as well as in the manuscript (prasasti) proves that it has a Śivaistik Concept, where Śiva is worshiped as the highest Devata (Parabrahman)

Polarization as an indicator of intrinsic alignment in radio weak lensing

We propose a new technique for weak gravitational lensing in the radio band making use of polarization information. Since the orientation of a galaxy's polarized emission is both unaffected by lensing and is related to the galaxy's intrinsic orientation, it effectively provides information on the unlensed galaxy position angle. We derive a new weak lensing estimator which exploits this effect and makes full use of both the observed galaxy shapes and the estimates of the intrinsic position angles as provided by polarization. Our method has the potential to both reduce the effects of shot noise, and to reduce to negligible levels, in a model-independent way, all effects of intrinsic galaxy alignments. We test our technique on simulated weak lensing skies, including an intrinsic alignment contaminant consistent with recent observations, in three overlapping redshift bins. Adopting a standard weak lensing analysis and ignoring intrinsic alignments results in biases of 5-10% in the recovered power spectra and cosmological parameters. Applying our new estimator to one tenth the number of galaxies used for the standard case, we recover both power spectra and the input cosmology with similar precision as compared to the standard case and with negligible residual bias, even in the presence of a substantial (astrophysical) scatter in the relationship between the observed orientation of the polarized emission and the intrinsic orientation. Assuming a reasonable polarization fraction for star-forming galaxies, and no cosmological conspiracy in the relationship between polarization direction and intrinsic morphology, our estimator should prove a valuable tool for weak lensing analyses of forthcoming radio surveys, in particular, deep wide field surveys with e-MERLIN, MeerKAT and ASKAP and ultimately, definitive radio lensing surveys with the SKA.Comment: 18 pages, 10 figures, submitted to MNRA

Dive Into The Implication of The Great Mandate In The Teaching of Christian Religious Education Today

In the context of Christian education, education has a central role in shaping Christian character and encouraging students to implement the Great Commission in their actions and behavior. The Christian education approach covers various aspects, including the formation of Christian character, understanding values such as love and caring, spreading God's Word, motivation for service and giving, and pastoral spiritual aspects of students. Christian education also motivates students to carry out service and giving as an expression of Christ's love for fellow human beings. Thus, students learn to reflect on values such as forgiveness, honesty, and compassion in the context of service. The importance of spreading God's Word in Christian education includes a deep understanding of the message of God's Word and how it is relevant in everyday life. Students are taught to understand the teachings of Christianity in a spiritual context and apply them in their lives, including in their decisions and actions. It includes the development of a personal relationship with God, an understanding of spiritual vocations, and character development that reflects the values of Christianity. Spiritual guidance and deepening understanding of Christian teachings are integral in shepherding the spiritual aspects of students. Thus, Christian education has a great responsibility in shaping Christian character, understanding the values of Christianity, and shepherding the spiritual aspects of students. Through this holistic approach, Christian education helps students carry out the Great Commission in their actions and behaviors, making them beneficial citizens of society as well as staunch followers of Christian religious values