2009A&A...499..649M


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST18:39:30

2009A&A...499..649M - Astronomy and Astrophysics, volume 499, 649-652 (2009/6-1)

23 GHz VLBI observations of SN 2008ax.

MARTI-VIDAL I., MARCAIDE J.M., ALBERDI A., GUIRADO J.C., PEREZ-TORRES M.A., ROS E., SHAPIRO I.I., BESWICK R.J., MUXLOW T.W.B., PEDLAR A., ARGO M.K., IMMLER S., PANAGIA N., STOCKDALE C.J., SRAMEK R.A., VAN DYK S. and WEILER K.W.

Abstract (from CDS):

We report on phase-referenced 23GHz Very-Long-Baseline-Interferometry (VLBI) observations of the type IIb supernova SN 2008ax, made with the Very Long Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These observations resulted in a marginal detection of the supernova. The total flux density recovered from our VLBI image is 0.8±0.3mJy (one standard deviation). As it appears, the structure may be interpreted as either a core-jet or a double source. However, the supernova structure could be somewhat confused with a possible close by noise peak. In such a case, the recovered flux density would decrease to 0.48±0.12mJy, compatible with the flux densities measured with the VLA at epochs close in time to our VLBI observations. The lowest average expansion velocities derived from our observations are (1.90±0.30)x105km/s (case of a double source) and (5.2±1.3)x104km/s (taking the weaker source component as a spurious, close by, noise peak, which is the more likely interpretation). These velocities are 7.3 and 2 times higher, respectively, than the maximum ejecta velocity inferred from optical-line observations.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4490 - radio continuum: stars - supernovae: individual: SN 2008ax - supernovae: general

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1256 1
2 6C 122223+435147 BLL 12 24 51.50533625 +43 35 19.2870920   21.12 20.66 20.2   ~ 55 3
3 6C 122321+393057 QSO 12 25 50.56907939 +39 14 22.6864509   19.2 20.6     ~ 32 1
4 NGC 4485 GiP 12 30 31.113 +41 42 04.22 12.10 12.42 11.93 11.93   ~ 254 2
5 NGC 4490 GiP 12 30 36.368 +41 38 37.07 10.03 10.22 9.79     ~ 527 3
6 SN 2008ax SN* 12 30 40.80 +41 38 16.1   23.6 23.5 14.1 22.6 SNIIb 207 1

    Equat.    Gal    SGal    Ecl

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2020.08.14-18:39:30

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