A multifrequency study of G182.4+4.3: a new supernova remnant in the Galactic anti-centre

Details A multifrequency study of G182.4+4.3: a new supernova remnant in the Galactic anti-centre A multifrequency study of G182.4+4.3: a new supernova remnant in the Galactic anti-centre

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...331..661k&link_type=abstract

Astronomy and Astrophysics, v.331, p.661-668 (1998)

Astronomy and Astrophysics

Astrophysics

11

Ism: Individual Objects: G182.4+4.3, Ism: Supernova Remnants, Polarization, Radio Continuum: Ism

Scientific paper

A new supernova remnant (G182.4+4.3) in the Galactic anti-centre region has been detected at radio frequencies. Observations at 1400 MHz, 2675 MHz, 4850 MHz, and at 10450 MHz with the Effelsberg 100-m telescope reveal a shell structure of about 50' across. The flux density radio spectral index is alpha =-0.42 +/- 0.10, (S_nu ~ nu (alpha ) ). The polarization percentage of the brighter part of the shell is about 40%. At 4850 MHz the polarization percentage near the peak of the shell exceeds 60%. The Faraday rotation measure varies between 0 rad m(-2) and 70 rad m(-2) . The total flux density extrapolated to 1 GHz is 1.24 +/- 0.38 Jy leading to a radio surface brightness of Sigma_ {1 GHz} = 7.5 10(-23) Watt m(-2) Hz(-1) sr(-1) . HI line observations of neutral hydrogen show that the column density towards G182.4+4.3 must be <= 4 10(21) cm(-2) . No X-ray emission is visible in the ROSAT all-sky survey at the position of the new supernova remnant. This corresponds to an upper limit of 6.2 10(-2) counts s(-1) . Some information on the nature of G182.4+4.3 is obtained from a discussion of these observations: G182.4+4.3 is at a distance of >= 3 kpc and probably expanding according to the classical Sedov equations. Assuming an initial explosion energy of 10(51) erg the following parameters are obtained: n_0 ~ 0.013 cm(-3) , a radius of R ~ 22.5 pc, a swept-up mass of Msw ~ 14 M_sun, kT ~ 5.0 keV, age = 3800 years, and Vexp = 2300 km s(-1) .

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