ar X iv : a st ro - p h / 01 03 03 4 v 1 2 M ar 2 00 1 The Peculiar Type Ia Supernova 1999 by : Spectroscopy at Early Epochs
نویسندگان
چکیده
We present medium resolution (λ/∆λ ≈ 2500) optical spectroscopy of SN 1999by in NGC 2841 made around its light maximum. The depth ratio of the two Si II features at 5800Å and 6150Å being R(SiII)≈ 0.63 at maximum indicates that this SN belongs to the peculiar, sub-luminous SNe Ia. Radial velocities inferred from the minimum of the 6150Å trough reveal a steeper decline of the velocity curve than expected for " normal " SNe Ia, consistent with the behavior of published V RI light curves. A revised absolute magnitude of SN 1999by and distance to its host galaxy NGC 2841 is estimated based on the Multi-Color Light Curve Shape (MLCS) method, resulting in M V (max)=−18.06 ±0.1 mag and d = 17.1 ± 1.2 Mpc, respectively. An approximative linear dependence of the luminosity parameter ∆ on R(SiII) is presented.
منابع مشابه
ar X iv : a st ro - p h / 01 03 25 4 v 1 1 6 M ar 2 00 1 Construction of the Variability → Luminosity Estimator
متن کامل
ar X iv : a st ro - p h / 03 08 01 8 v 1 1 A ug 2 00 3 Have the Elusive Progenitors of Supernovae Type Ia Been Discovered ?
The recent detection of Hα emission in the supernova Type Ia SN 2002ic could be taken to mean that the elusive progenitor systems of Type Ia supernovae have finally been identified. At first glance, the observation appears to support a single-degenerate scenario, in which the white dwarf accretes from a normal companion. In this Letter we show that the opposite may be true, and the observations...
متن کاملar X iv : a st ro - p h / 04 05 56 0 v 1 2 7 M ay 2 00 4 ESC Observations of SN 2002 er around Maximum Light
We present preliminary results of the observational campaign on SN 2002er carried out by the European Supernova Collaboration (ESC). For this supernova the optical coverage from epochs −11 days to +50 days is excellent, both in imaging and spectroscopy. The extinction deduced from the photometry is E(B − V) = 0.35, while ∆m15 = 1.31. In general SN 2002er behaves like a " normal " type Ia supern...
متن کاملar X iv : a st ro - p h / 01 03 44 4 v 1 2 7 M ar 2 00 1 From Centimeter to Millimeter Wavelengths : A High Angular Resolution Study of 3 C 273
We monitored 3C 273 with VLBI at 15–86 GHz since 1990. We discuss component trajectories, opacity effects, a rotating jet, and outburst-ejection relations from Gamma-ray to radio bands.
متن کاملar X iv : a st ro - p h / 04 03 02 4 v 1 1 M ar 2 00 4 On coordinate distances to type Ia supernovae and radio galaxies
Quantum model of homogeneous and isotropic universe predicts logarithmic-law dependence of coordinate distance to source on redshift z which is in good agreement with type Ia supernovae and radio galaxies observations for the redshift range z = 0.01 − 1.8. Comparison with phenomenological models with dark energy in the form of cosmological constant and without dark energy component is made. Flu...
متن کامل