1997A&A...324..683D


Query : 1997A&A...324..683D

1997A&A...324..683D - Astronomy and Astrophysics, volume 324, 683-689 (1997/8-2)

COMPTEL three-year search for galactic sources of 44Ti gamma-ray line emission at 1.157MeV.

DUPRAZ C., BLOEMEN H., BENNETT K., DIEHL R., HERMSEN W., IYUDIN A.F., RYAN J. and SCHOENFELDER V.

Abstract (from CDS):

Because of its short lifetime, radioactive 44Ti is a probe of the supernova activity of the Galaxy during the last few centuries. The COMPTEL experiment aboard the Compton Observatory is capable of imaging sources of 44Ti line emission at 1.157MeV with a sensitivity of about 2x10–5γ/cm2/s. The latest known supernova remnant in the Milky Way, Cassiopeia A, has already been detected by COMPTEL (Iyudin et al. 1994A&A...284L...1I). Although no further event has been observed for 300-years, young objects still obscured by interstellar extinction may also show up in the light of decaying 44Ti. Using the first three years of COMPTEL observations, we have carried out a systematic 1.157MeV survey of the Galactic plane in order to search for these conjectural 44Ti sources. We report on the following issues: – of the six Galactic supernovae recorded during the last millenium, only Cassiopeia A is detected by COMPTEL. The updated flux, (3.4 ±0.9)x10–5γ/cm2/s (systematic uncertainty ≲25%), is lower than previously determined and implies an initial 44Ti mass of 0.9 to 2.4x10–4M in better agreement with observational and theoretical pictures of the Cas A supernova; – no serendipitous 44Ti source is detected by COMPTEL at the ≥3σ level, whereas we would expect 3 detections on statistical grounds. This negative conclusion is consistent at the <5% confidence level with canonical values of the Galactic supernova rate (2.5 to 3 events per century) and 44Ti supernova yields (a few 10–5 to 10–4M).

Abstract Copyright:

Journal keyword(s): nucleosynthesis - gamma-ray: observations - supernovae: general - Cas A - ISM: supernova remnants

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1124 1
2 SNR G130.7+03.1 SNR 02 05 37.0 +64 49 42           ~ 588 4
3 IC 348 OpC 03 44 32 +32 09.5           ~ 1300 1
4 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5027 0
5 M 1 SNR 05 34 32 +22 00.8           ~ 5903 1
6 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1260 1
7 NAME Kepler SNR Rad 17 30 35.976 -21 28 56.23           ~ 748 4
8 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4090 0
9 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2591 1

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2022.05.21-23:37:02

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