The Distance to Supernova 1998aq in NGC3982
نویسندگان
چکیده
The distance to NGC3982, host galaxy to the Type Ia supernova SN1998aq, is derived using 32 Cepheids discovered in archival multi-epoch Hubble Space Telescope observations. Employing recent Large Magellanic Cloud Cepheid period-luminosity relations and absolute zero point, we find a distance to NGC3982 of 20.5±0.8 (r)±1.7 (s)Mpc, including both random (r) and systematic (s) uncertainties, and ignoring any metallicity dependency in the Cepheid period-luminosity relation. Still unpublished light curve photometry promises to make SN1998aq one of the most important calibrators for the Type Ia supernova decline rate–peak luminosity relationship.
منابع مشابه
ar X iv : a st ro - p h / 03 05 32 1 v 1 1 8 M ay 2 00 3 Optical Spectra of the Type Ia Supernova 1998 aq
We present 29 optical spectra of the normal Type Ia SN 1998aq, ranging from 9 days before to 241 days after the time of maximum brightness. This spectrocopic data set, together with photometric data presented elsewhere, makes SN 1998aq one of the best observed Type Ia supernovae at optical wavelengths. We use the parameterized supernova synthetic–spectrum code Synow to study line identification...
متن کاملResponses of Almond Genotypes to Osmotic Stress Induced In Vitro
Drought is one of the major limitations to crop production worldwide. This study was conducted to evaluate the response of five almond genotypes and peach×almond hybrid GF to drought stress in vitro, and screening drought tolerance. Explants subjected to polyethylene glycol osmotic stress ( , , and . % WV) on the MS medium. Increasing PEG level in the medium significantly reduced fresh weight a...
متن کاملMeasuring Type Ia Supernova Distances and Redshifts From Their Multi-band Light Curves
The distance and redshift of a type Ia supernova can be determined simultaneously through its multi-band light curves. This fact may be used for imaging surveys that discover and obtain photometry for large numbers of supernovae; so many that it would be difficult to obtain a spectroscopic redshift for each. Using available supernova-analysis tools we find that there are several conditions in w...
متن کاملConstraints of age , distance and progenitor of the supernova remnant RX
The discovery of the nearest young supernova remnant RX J0852.0-4622 / GRO J0852-4642 in the Galaxy by ROSAT and COMPTEL has been reported recently. Age and distance are determined to ∼680 years and ∼200 pc by the Xray diameter and the γ-ray line flux of radioactive 44Ti. Here we discuss the implications of the X-ray spectra and of the fact that 1.8 MeV γ-ray line emission from the decay of 26A...
متن کاملDeep-Ocean Crusts as Telescopes: Using Live Radioisotopes to Probe Supernova Nucleosynthesis
Live 60Fe has recently been detected in a deep-ocean ferromanganese crust, isolated in layers dating from about 3 Myr ago. Since 60Fe has a mean life of 2.2 Myr, a nearEarth supernova is the only likely source for such a signal, and we explore here the consequences of a supernova origin. We combine the 60Fe data with several supernova nucleosynthesis models to calculate the supernova distance a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001