10 results on '"RIESS, ADAM G."'
Search Results
2. A TYPE Ia SUPERNOVA AT REDSHIFT 1.55 IN HUBBLE SPACE TELESCOPE INFRARED OBSERVATIONS FROM CANDELS.
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Rodney, Steven A., Riess, Adam G., Dahlen, Tomas, Strolger, Louis-Gregory, Ferguson, Henry C., Hjorth, Jens, Frederiksen, Teddy F., Weiner, Benjamin J., Mobasher, Bahram, Casertano, Stefano, Jones, David O., Challis, Peter, Faber, S. M., Filippenko, Alexei V., Garnavich, Peter, Graur, Or, Grogin, Norman A., Hayden, Brian, Jha, Saurabh W., and Kirshner, Robert P.
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TYPE I supernovae , *REDSHIFT , *ASTRONOMICAL spectroscopy , *ASTRONOMY - Abstract
We report the discovery of a Type la supernova (SN Ia) at redshift z = 1.55 with the infrared detector of the Wide Field Camera 3 (WFC3-IR) on the Hubble Space Telescope (HST). This object was discovered in CANDELS imaging data of the Hubble Ultra Deep Field and followed as part of the CANDELS+CLASH Supernova project, comprising the SN search components from those two HST multi-cycle treasury programs. This is the highest redshift SN Ia with direct spectroscopic evidence for classification. It is also the first SN Ia at z > 1 found and followed in the infrared, providing a full light curve in rest-frame optical bands. The classification and redshift are securely defined from a combination of multi-band and multi-epoch photometry of the SN, ground-based spectroscopy of the host galaxy, and WFC3-IR grism spectroscopy of both the SN and host. This object is the first of a projected sample at z > 1.5 that will be discovered by the CANDELS and CLASH programs. The full CANDELS+CLASH SN Ia sample will enable unique tests for evolutionary effects that could arise due to differences in SN Ia progenitor systems as a function of redshift. This high-z sample will also allow measurement of the SN Ia rate out to z ≈ 2, providing a complementary constraint on SN Ia progenitor models. [ABSTRACT FROM AUTHOR]
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- 2012
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3. CEPHEID PERIOD-LUMINOSITY RELATIONS IN THE NEAR-INFRARED AND THE DISTANCE TO M31 FROM THE HUBBLE SPACE TELESCOPE WIDE FIELD CAMERA 3.
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Riess, Adam G., Fliri, Jürgen, and Valls-Gabaud, David
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CEPHEIDS , *STAR observations , *REDSHIFT , *METAPHYSICAL cosmology - Abstract
We present measurements of 68 classical Cepheids, most detected from the Canada-France-Hawaii Telescope POMME Survey, with periods from 10 to 78 days observed in the near-infrared by the Panchromatic Hubble Andromeda Treasury Program using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). The combination of HSTs resolution and the use of near-infrared measurements provide a dramatic reduction in the dispersion of the period-luminosity relation over the present optical, ground-based data. Even using random phase magnitudes we measure a dispersion of just 0.17 mag, implying a dispersion of just 0.12 mag for mean magnitudes. The error in the mean for this relation is 1% in distance. Combined with similar observations of Cepheids in other hosts and independent distance determinations, we measure a distance to M31 of µ0 = 24.38 ± 0.06(statistical) ± 0.03(systematic), 752 ± 27 kpc, in good agreement with past measurements though with a better. 3% precision here. The result is also in good agreement with independent distance determinations from two detached eclipsing binaries allowing for an independent calibration of the Cepheid luminosities and a determination of the Hubble constant. [ABSTRACT FROM AUTHOR]
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- 2012
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4. ERRATUM: “A 3% SOLUTION: DETERMINATION OF THE HUBBLE CONSTANT WITH THE HUBBLE SPACE TELESCOPE AND WIDE FIELD CAMERA 3” (2011, ApJ, 730, 119).
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Riess, Adam G., Macri, Lucas, Casertano, Stefano, Lampeitl, Hubert, Ferguson, Henry C., Filippenko, Alexei V., Jha, Saurabh W., Li, Weidong, Chornock, Ryan, and Silverman, Jeffrey M.
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HUBBLE constant - Abstract
A correction to the article "A 3% Solution: Determination of the Hubble Constant With the Hubble Space Telescope and Wide Field Camera," by Adam G. Riess and colleagues, is presented.
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- 2012
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5. THE DISCOVERY OF THE MOST DISTANT KNOWN TYPE Ia SUPERNOVA AT REDSHIFT 1.914.
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JONES, DAVID O., RODNEY, STEVEN A., RIESS, ADAM G., MOBASHER, BAHRAM, DAHLEN, TOMAS, MCCULLY, CURTIS, FREDERIKSEN, TEDDY F., CASERTANO, STEFANO, HJORTH, JENS, KEETON, CHARLES R., KOEKEMOER, ANTON, STROLGER, LOUIS-GREGORY, WIKLIND, TOMMY G., CHALLIS, PETER, GRAUR, OR, HAYDEN, BRIAN, PATEL, BRANDON, WEINER, BENJAMIN J., FILIPPENKO, ALEXEI V., and GARNAVICH, PETER
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GALAXY spectra , *ASTRONOMICAL spectroscopy , *METAPHYSICAL cosmology , *SOLAR activity - Abstract
We present the discovery of a Type Ia supernova (SN) at redshift z = 1.914 from the CANDELS multi-cycle treasury program on the Hubble Space Telescope (HST). This SN was discovered in the infrared using the Wide- Field Camera 3, and it is the highest-redshift Type Ia SN yet observed. We classify this object as a SN Ia by comparing its light curve and spectrum with those of a large sample of Type Ia and core-collapse SNe. Its apparent magnitude is consistent with that expected from the ΛCDM concordance cosmology.We discuss the use of spectral evidence for classification of z > 1.5 SNe Ia using HST grism simulations, finding that spectral data alone can frequently rule out SNe II, but distinguishing between SNe Ia and SNe Ib/c can require prohibitively long exposures. In such cases, a quantitative analysis of the light curve may be necessary for classification. Our photometric and spectroscopic classification methods can aid the determination of SN rates and cosmological parameters from the full high-redshift CANDELS SN sample. [ABSTRACT FROM AUTHOR]
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- 2013
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6. Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens.
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Kelly, Patrick L., Rodney, Steven A., Treu, Tommaso, Foley, Ryan J., Brammer, Gabriel, Schmidt, Kasper B., Zitrin, Adi, Sonnenfeld, Alessandro, Strolger, Louis-Gregory, Graur, Or, Filippenko, Alexei V., Jha, Saurabh W., Riess, Adam G., Bradac, Marusa, Weiner, Benjamin J., Scolnic, Daniel, Malkan, Matthew A., von der Linden, Anja, Trenti, Michele, and Hjorth, Jens
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GRAVITATIONAL lenses , *SUPERNOVAE , *EXPANDING universe , *SPIRAL galaxies , *GALAXY clusters - Abstract
The article focuses on the discovery of four images of a single supernova caused by an early-type cluster galaxy gravitational lens. It states that researchers used the Hubble Space Telescope to discover a supernova forming an Einstein cross configuration and mentions the lens also created multiple images of the spiral galaxy the supernova occurred in. It talks about the use of the multiple images to examine the cosmic expansion rate and the distribution of matter in the galaxy lens.
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- 2015
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7. HUBBLE SPACE TELESCOPE AND GROUND-BASED OBSERVATIONS OF THE TYPE Iax SUPERNOVAE SN 2005hk AND SN 2008A.
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McCully, Curtis, Jha, Saurabh W., Foley, Ryan J., Chornock, Ryan, Holtzman, Jon A., Balam, David D., Branch, David, Filippenko, Alexei V., Frieman, Joshua, Fynbo, Johan, Galbany, Lluis, Ganeshalingam, Mohan, Garnavich, Peter M., Graham, Melissa L., Hsiao, Eric Y., Leloudas, Giorgos, Leonard, Douglas C., Li, Weidong, Riess, Adam G., and Sako, Masao
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TYPE I supernovae , *ASTRONOMICAL observations , *WHITE dwarf stars , *INFRARED astronomy - Abstract
We present Hubble Space Telescope (HST) and ground-based optical and near-infrared observations of SN 2005hk and SN 2008A, typical members of the Type Iax class of supernovae (SNe). Here we focus on late-time observations, where these objects deviate most dramatically from all other SN types. Instead of the dominant nebular emission lines that are observed in other SNe at late phases, spectra of SNe 2005hk and 2008A show lines of Fe II, Ca II, and Fe I more than a year past maximum light, along with narrow [Fe II] and [Ca II] emission. We use spectral features to constrain the temperature and density of the ejecta, and find high densities at late times, with ne ≳ 109 cm–3. Such high densities should yield enhanced cooling of the ejecta, making these objects good candidates to observe the expected “infrared catastrophe,” a generic feature of SN Ia models. However, our HST photometry of SN 2008A does not match the predictions of an infrared catastrophe. Moreover, our HST observations rule out a “complete deflagration” that fully disrupts the white dwarf for these peculiar SNe, showing no evidence for unburned material at late times. Deflagration explosion models that leave behind a bound remnant can match some of the observed properties of SNe Iax, but no published model is consistent with all of our observations of SNe 2005hk and 2008A. [ABSTRACT FROM AUTHOR]
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- 2014
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8. Improving dark energy constraints with high-redshift Type Ia supernovae from CANDELS and CLASH.
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Salzano, Vincenzo, Rodney, Steven A., Sendra, Irene, Lazkoz, Ruth, Riess, Adam G., Postman, Marc, Broadhurst, Tom, and Coe, Dan
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DARK energy , *REDSHIFT , *METAPHYSICAL cosmology , *LUMINOSITY - Abstract
Aims. We investigated the degree of improvement in dark energy constraints that can be achieved by extending Type Ia supernova (SN Ia) samples to redshifts z > 1:5 with the Hubble Space Telescope (HST), particularly in the ongoing Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and the Cluster Lensing and Supernova survey with Hubble (CLASH) multi-cycle treasury programs. Methods. Using the popular Chevalier-Polarski-Linder (CPL) parametrization of the dark energy w = w0 + wa(1 - a) we generated mock SN Ia samples that can be projected out to higher redshifts. The synthetic datasets thus generated were fitted to the CPL model, and we evaluated the improvements that a high-z sample can add to improve the statistical and systematic uncertainties on cosmological parameters. Results. In an optimistic but still very achievable scenario, we find that extending the HST sample beyond CANDELS+CLASH to reach a total of 28 SN Ia at z > 1:0 could improve the uncertainty in the wa parameter σwaby up to 21%. The corresponding improvement in the figure of merit (FoM) would be as high as 28%. Finally, we consider the use of high-redshift SN Ia samples to detect non-cosmological evolution in SN Ia luminosities with redshift, finding that these tests could be undertaken by future space-based infrared surveys using the James Webb Space Telescope (JWST). [ABSTRACT FROM AUTHOR]
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- 2013
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9. THE EXTENDED HUBBLE SPACE TELESCOPE SUPERNOVA SURVEY: THE RATE OF CORE COLLAPSE SUPERNOVAE TO z ∼ 1.
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Dahlen, Tomas, Strolger, Louis-Gregory, Riess, Adam G., Mattila, Seppo, Kankare, Erkki, and Mobasher, Bahram
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SUPERNOVAE , *REDSHIFT , *CATACLYSMIC variable stars , *GALACTIC X-ray sources - Abstract
We use a sample of 45 core collapse supernovae detected with the Advanced Camera for Surveys on board the Hubble Space Telescope to derive the core collapse supernova rate in the redshift range 0.1 < z < 1.3. In redshift bins centered on 〈 z〉 = 0.39, 〈 z〉 = 0.73, and 〈 z〉 = 1.11, we find rates of 3.00+1.28– 0.94+1.04– 0.57, 7.39+1.86– 1.52+3.20– 1.60, and 9.57+3.76– 2.80+4.96– 2.80, respectively, given in units of yr–1 Mpc–3 10–4h370. The rates have been corrected for host galaxy extinction, including supernovae missed in highly dust-enshrouded environments in infrared bright galaxies. The first errors are statistical while the second ones are the estimated systematic errors. We perform a detailed discussion of possible sources of systematic errors and note that these start to dominate over statistical errors at z > 0.5, emphasizing the need to better control the systematic effects. For example, a better understanding of the amount of dust extinction in the host galaxies and knowledge of the supernova luminosity function, in particular the fraction of faint M ≳ –15 supernovae, is needed to better constrain the rates. When comparing our results with the core collapse supernova rate based on the star formation rate, we find a good agreement, consistent with the supernova rate following the star formation rate, as expected. [ABSTRACT FROM AUTHOR]
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- 2012
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10. A luminous, blue progenitor system for the type Iax supernova 2012Z.
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McCully, Curtis, Jha, Saurabh W., Foley, Ryan J., Bildsten, Lars, Fong, Wen-fai, Kirshner, Robert P., Marion, G. H., Riess, Adam G., and Stritzinger, Maximilian D.
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STELLAR activity , *SUPERNOVAE , *B stars , *SUPERGIANT stars - Abstract
Type Iax supernovae are stellar explosions that are spectroscopically similar to some type Ia supernovae at the time of maximum light emission, except with lower ejecta velocities. They are also distinguished by lower luminosities. At late times, their spectroscopic properties diverge from those of other supernovae, but their composition (dominated by iron-group and intermediate-mass elements) suggests a physical connection to normal type Ia supernovae. Supernovae of type Iax are not rare; they occur at a rate between 5 and 30 per cent of the normal type Ia rate. The leading models for type Iax supernovae are thermonuclear explosions of accreting carbon-oxygen white dwarfs that do not completely unbind the star, implying that they are 'less successful' versions of normal type Ia supernovae, where complete stellar disruption is observed. Here we report the detection of the luminous, blue progenitor system of the type Iax SN 2012Z in deep pre-explosion imaging. The progenitor system's luminosity, colours, environment and similarity to the progenitor of the Galactic helium nova V445 Puppis suggest that SN 2012Z was the explosion of a white dwarf accreting material from a helium-star companion. Observations over the next few years, after SN 2012Z has faded, will either confirm this hypothesis or perhaps show that this supernova was actually the explosive death of a massive star. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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