2006A&A...450.1037T


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET04:37:34

2006A&A...450.1037T - Astronomy and Astrophysics, volume 450, 1037-1050 (2006/5-2)

Are 44Ti-producing supernovae exceptional?

THE L.-S., CLAYTON D.D., DIEHL R., HARTMANN D.H., IYUDIN A.F., LEISING M.D., MEYER B.S., MOTIZUKI Y. and SCHOENFELDER V.

Abstract (from CDS):

According to standard models supernovae produce radioactive 44Ti, which should be visible in gamma-rays following decay to 44Ca for a few centuries. 44Ti production is believed to be the source of cosmic 44Ca, whose abundance is well established. Yet, gamma-ray telescopes have not seen the expected young remnants of core collapse events. The 44Ti mean life of τ≃89y and the Galactic supernova rate of ≃3/100y imply ≃several detectable 44Ti gamma-ray sources, but only one is clearly seen, the 340-year-old Cas A SNR. Furthermore, supernovae which produce much 44Ti are expected to occur primarily in the inner part of the Galaxy, where young massive stars are most abundant. Because the Galaxy is transparent to gamma-rays, this should be the dominant location of expected gamma-ray sources. Yet the Cas A SNR as the only one source is located far from the inner Galaxy (at longitude 112°). We evaluate the surprising absence of detectable supernovae from the past three centuries. We discuss whether our understanding of SN explosions, their 44Ti yields, their spatial distributions, and statistical arguments can be stretched so that this apparent disagreement may be accommodated within reasonable expectations, or if we have to revise some or all of the above aspects to bring expectations in agreement with the observations. We conclude that either core collapse supernovae have been improbably rare in the Galaxy during the past few centuries, or 44Ti-producing supernovae are atypical supernovae. We also present a new argument based on 44Ca/40Ca ratios in mainstream SiC stardust grains that may cast doubt on massive-He-cap type I supernovae as the source of most galactic 44Ca.

Abstract Copyright:

Journal keyword(s): ISM: abundances - Galaxy: abundances - gamma rays: observations - ISM: supernova remnants - supernovae: general - dust, extinction

Simbad objects: 15

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Number of rows : 15

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 1572A SN* 00 25 21.5 +64 08 27           B8 1059 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10705 1
3 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5069 1
4 SNR G130.7+03.1 SNR 02 05 37.0 +64 49 42           ~ 554 4
5 Ass Per OB 2 As* 03 42.2 +33 26           ~ 304 0
6 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           F 4749 1
7 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5530 4
8 SN 1987A SN* 05 35 28.020 -69 16 11.07   4.75 4.81     SN.IIPec 4415 2
9 NAME Vela Jr SN SNR 08 52.0 -46 20           ~ 394 2
10 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3722 4
11 NAME Lupus SN SNR 15 02 22.1 -42 05 49           SNIa 1197 1
12 NAME Kepler SNR Rad 17 30 35.976 -21 28 56.23           SNIa 704 4
13 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
14 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2362 1
15 NAME Vela Field reg ~ ~           ~ 145 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-04:37:34

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