2008A&A...481..117H


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.06CET16:09:15

2008A&A...481..117H - Astronomy and Astrophysics, volume 481, 117-122 (2008/4-1)

Broad Lyα emission from supernova remnants in young galaxies.

HENG K. and SUNYAEV R.A.

Abstract (from CDS):

Charge transfer (or exchange) reactions between hydrogen atoms and protons in collisionless shocks of supernova remnants (SNRs) are a natural way of producing broad Balmer, Lyman, and other lines of hydrogen. We wish to quantify the importance of shock-induced, non-thermal hydrogen emission from SNRs in young galaxies. We present a method estimating the luminosity of broad (∼1000km/s) Lyα, Lyβ, Lyγ, Hβ and Pα lines, as well as the broad and narrow luminosities of the two-photon (2γ) continuum, from existing measurements of the Hα flux. We consider cases of β=0.1 and 1, where β=Te/Tp is the ratio of electron-to-proton temperatures. We examine a modest sample of 8 proximate, Balmer-dominated SNRs from our Galaxy and the Large Magellanic Cloud. The expected broad Lyα luminosity per object is at most ∼1036erg/s. The 2γ continuum luminosities are comparable to the broad Hα and Lyα ones. We restrict our analysis to homogenous and static media. Differences in the Lyα/Hα and Lyβ/Hα luminosity ratios between the β=0.1 and 1 cases are factors ∼2 for shock velocities 1000≲vs≲4000km/s, thereby providing a direct and unique way to measure β. In principle, broad, ``non-radiative'' Lyα from SNRs in young galaxies can be directly observed in the optical range of wavelengths. However, by taking the different rates between core collapse and thermonuclear supernovae into consideration, as well as the duration we expect to observe such Lyα emission from SNRs, we expect their contribution to the total Lyα luminosity from z∼3 to 5 galaxies to be negligibly small (∼0.001%), compared to the radiative shock mechanism described by Shull & Silk (1979ApJ...234..427S). Although broad, non-thermal Lyα emission has never been observed, these photons are produced in SNRs. Hence, the non-radiative Lyα luminosity is a part of the intrinsic Lyα spectrum of young galaxies.

Abstract Copyright:

Journal keyword(s): ISM: supernova remnants - atomic processes - radiation mechanisms: general - galaxies: general

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1092 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11217 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9710 1
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5253 1
5 SNR B0505-67.9 SNR 05 05 42.0 -67 52 29           ~ 127 0
6 SNR B0509-67.5 SNR 05 09 31 -67 31.3           ~ 197 0
7 SNR B0519-69.0 SNR 05 19 35.14 -69 02 00.5           ~ 133 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15214 1
9 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4563 2
10 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1639 1
11 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4044 5
12 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2604 2
13 ESO 134-11 HII 14 40 29 -62 38.7           ~ 516 1
14 SNR G315.0-02.3 SNR 14 43 00 -62 30.0           ~ 349 1
15 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1228 1
16 NAME Kepler SNR Rad 17 30 35.976 -21 28 56.23           ~ 725 4
17 SS 433 HXB 19 11 49.5645897700 +04 58 57.824087535   16.3 13.0     A7Ib: 1959 4
18 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 837 0
19 SNR G094.0+01.0 SNR 21 23 56.6 +51 58 41           ~ 81 0
20 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2476 1

    Equat.    Gal    SGal    Ecl

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