The present status of organic elemental microanalysis

Schöniger, Wolfgang

doi:10.1351/pac197021040497

Cited by 17 publications

(14 citation statements)

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“…In particular, Jörsäter & van Moorsel found that the inner disk of NGC 1365 has a significantly different inclination angle (40 • ) compared to previous work using optical isophotes (55 • ) by Linblad (1978). Other inclination angles found in the literature are 56 • (Bartunov et al 1994), 61 • (Schoniger & Sofue 1994, Aaronson et al 1981, 44 • ± 5 • (Bureau, Mould, & Staveley-Smith 1996), 46 • ± 8 • (Ondrechen & van der Hulst 1989) and 63 • (Tully 1988). This scatter is a result of the warped nature of the NGC 1365 disk (Jörsäter & van Moorsel 1995) combined with the various observational methods the authors used to determine the the major and minor axis diameters.…”

Section: Introductionmentioning

confidence: 88%

TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XIV. The Cepheids in NGC 1365

Silbermann

Harding

Ferrarese

et al. 1999

ApJ

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We report the detection of Cepheid variable stars in the barred spiral galaxy NGC 1365, located in the Fornax cluster, using the Hubble Space Telescope Wide Field and Planetary Camera 2. Twelve V (F555W) and four I (F814W) epochs of observation were obtained. The two photometry packages, ALLFRAME and DoPHOT, were separately used to obtain profile-fitting photometry of all the stars in the HST field. The search for Cepheid variable stars resulted in a sample of 52 variables, with periods between 14 and 60 days, in common with both datasets. ALLFRAME photometry and light curves of the Cepheids are presented. A subset of 34 Cepheids were selected on the basis of period, light curve shape, similar ALLFRAME and DoPHOT periods, color, and relative crowding, to fit the Cepheid period-luminosity relations in V and I for both ALLFRAME and DoPHOT. The measured distance modulus to NGC 1365 from the ALLFRAME photometry is 31.31 ± 0.20 (random) ± 0.18 (systematic) mag, corresponding to a distance of 18.3 ± 1.7 (random) ± 1.6 (systematic) Mpc. The reddening is measured to be E(V-I) = 0.16 ± 0.08 mag . These values are in excellent agreement with those

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Section: Introductionmentioning

confidence: 88%

TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XIV. The Cepheids in NGC 1365

Silbermann

Harding

Ferrarese

et al. 1999

ApJ

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“…Not surprisingly for such a famous and well-studied galaxy as NGC 6946, NED lists 32 redshift-independent distances. These include Tully-Fisher estimates of 5.0-5.3 Mpc by Bottinelli et al (1984;1986), 5.4-5.5 Mpc by Schoniger & Sofue (1994), and 5.5 Mpc by Pierce (1994). A number of SN-based distances have also been estimated, including early measurements with the expanding photosphere method (EPM) applied (2015) (4.5 Mpc), and applied with a modified version of this method by Poznanski et al (2009) to SN 2002hh (6.0 Mpc) and SN 2004et (4.7 Mpc).…”

Section: Distance To Sn 2017eawmentioning

confidence: 98%

The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor

Dyk

Zheng

Maund

et al. 2019

ApJ

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We present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN) 2017eaw in NGC 6946. SN 2017eaw is a normal SN II-P intermediate in properties between, for example, SN 1999em and SN 2012aw and the more luminous SN 2004et, also in NGC 6946. We have determined that the extinction to SN 2017eaw is primarily due to the Galactic foreground and that the SN site metallicity is likely subsolar. We have also independently confirmed a tip-of-the-red-giant-branch (TRGB) distance to NGC 6946 of 7.73±0.78 Mpc. The distances to the SN that we have also estimated via both the standardized candle method and expanding photosphere method corroborate the TRGB distance. We confirm the SN progenitor identity in pre-explosion archival Hubble Space Telescope (HST) and Spitzer Space Telescope images, via imaging of the SN through our HST Target of Opportunity program. Detailed modeling of the progenitor's spectral energy distribution indicates that the star was a dusty, luminous red supergiant consistent with an initial mass of ∼ 15 M ⊙ .

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“…The bolometric luminosity in the tail phase provides an accurate estimate of the 56 Ni mass ejected in the explosion. The distance to the host galaxy NGC 6946 is well estimated using different methods such as the H I Tully-Fisher relation (Pierce 1994), the CO Tully-Fisher relation (Schoniger & Sofue 1994) and the EPM for type II SNe (Schmidt et al 1994). We adopt a mean distance of 5.5 ± 1.0 Mpc.…”

Section: The Bolometric Light Curvementioning

confidence: 99%

Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio

Misra¹,

Pooley²,

Chandra³

et al. 2007

Monthly Notices of the Royal Astronomical Society

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We present X‐ray, broad‐band optical and low‐frequency radio observations of the bright type IIP supernova SN 2004et. The Chandra X‐ray Observatory observed the supernova at three epochs, and the optical coverage spans a period of ∼470 d since explosion. The X‐ray emission softens with time, and we characterize the X‐ray luminosity evolution as LX∝t−0.4. We use the observed X‐ray luminosity to estimate a mass‐loss rate for the progenitor star of ∼2 × 10−6 M⊙ yr−1. The optical light curve shows a pronounced plateau lasting for about 110 d. Temporal evolution of photospheric radius and colour temperature during the plateau phase is determined by making blackbody fits. We estimate the ejected mass of 56Ni to be 0.06 ± 0.03 M⊙. Using the expressions of Litvinova & Nadëzhin we estimate an explosion energy of (0.98 ± 0.25) × 1051 erg. We also present a single epoch radio observation of SN 2004et. We compare this with the predictions of the model proposed by Chevalier, Fransson & Nymark. These multiwavelength studies suggest a main‐sequence progenitor mass of ∼20 M⊙ for SN 2004et.

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The present status of organic elemental microanalysis

Cited by 17 publications

References 1 publication

TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XIV. The Cepheids in NGC 1365

TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XIV. The Cepheids in NGC 1365

The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor

Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio

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