2008A&A...485..223S


Query : 2008A&A...485..223S

2008A&A...485..223S - Astronomy and Astrophysics, volume 485, 223-231 (2008/7-1)

Detectability of gamma-ray emission from classical novae with Swift/BAT.

SENZIANI F., SKINNER G.K., JEAN P. and HERNANZ M.

Abstract (from CDS):

Classical novae are expected to emit gamma rays during their explosions. The most important contribution to the early gamma-ray emission comes from the annihilation with electrons of the positrons generated by the decay of 13N and 18F. The photons are expected to be down-scattered to a few tens of keV, and the emission is predicted to occur some days before the visual discovery and to last ∼2 days. Despite a number of attempts, no positive detections of such emission have been made, due to lack of sensitivity and of sky coverage. Because of its huge field of view, good sensitivity, and well-adapted (14-200keV) energy band, Swift/BAT offers a new opportunity for such searches. BAT data can be retrospectively used to search for prompt gamma-ray emission from the direction of novae after their optical discovery. We have estimated the expected success rate for the detection with BAT of gamma rays from classical novae using a Monte Carlo approach. Searches were performed for emission from novae occurring since the launch of Swift. Using the actual observing programme during the first 2.3 years of BAT operations as an example, and sensitivity achieved, we estimate the expected rate of detection of classical novae with BAT as ∼0.2-0.5yr–1, implying that several should be seen within a 10 yr mission. The search for emission in the directions of the 24 classical novae discovered since the Swift launch yielded no positive results, but none of these was known to be close enough for this to be a surprise. Detections of a recurrent nova (RS Oph) and a nearby dwarf nova (V455 And) demonstrate the efficacy of the technique. The absence of detections is consistent with the expectations from the Monte Carlo simulations, but the long-term prospects are encouraging given an anticipated Swift operating lifetime of ∼10 years.

Abstract Copyright:

Journal keyword(s): gamma rays: observations - nuclear reactions, nucleosynthesis, abundances - stars: novae, cataclysmic variables - stars: white dwarfs

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* V598 Pup CV* 07 05 42.4998538512 -38 14 39.435813924   16.07   15.86 15.85 ~ 41 0
2 V* V597 Pup No* 08 16 17.9596509204 -34 15 24.933440401   21.65       ~ 51 0
3 V* V1065 Cen No* 11 43 10.121 -58 04 04.08       18.4   ~ 45 0
4 V* V1047 Cen No* 13 20 49.74 -62 37 50.5           ~ 36 0
5 V* V382 Nor No* 16 19 44.74 -51 34 53.1           ~ 34 0
6 V* V390 Nor No* 16 32 11.51 -45 09 13.4           ~ 13 0
7 V* V1281 Sco No* 16 56 59.35 -35 21 50.2           ~ 21 0
8 V* V1280 Sco No* 16 57 40.91 -32 20 36.4           ~ 101 0
9 V* V2576 Oph CV* 17 15 33.00 -29 09 39.9           ~ 23 0
10 V* V2575 Oph No* 17 33 13.1 -24 21 07           ~ 6 0
11 V* V2615 Oph No* 17 42 43.9985841119 -23 40 35.084130692           ~ 54 1
12 V* V1188 Sco No* 17 44 21.59 -34 16 35.7           ~ 30 0
13 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
14 V* V378 Ser CV* 17 49 24.57 -12 59 59.2           ~ 24 0
15 V* RS Oph Sy* 17 50 13.1591484960 -06 42 28.480729788   11.884 10.776 11.228   K5.5/M0IIIe 1092 0
16 V* V5117 Sgr No* 17 58 52.61 -36 47 35.1           ~ 20 0
17 V* V5558 Sgr No* 18 10 18.2602518799 -18 46 52.222364370           ~ 69 0
18 V* V5115 Sgr No* 18 16 59.04 -25 56 38.8           ~ 39 0
19 V* V5116 Sgr No* 18 17 50.7277266627 -30 26 32.079704535     19.181   18.962 ~ 67 0
20 V* V476 Sct No* 18 32 04.75 -06 43 34.3           ~ 29 0
21 V* V477 Sct No* 18 38 42.93 -12 16 15.6           ~ 26 0
22 V* V1663 Aql No* 19 05 12.50 +05 14 12.0           Kep 34 0
23 V* V458 Vul PN 19 54 24.6304743344 +20 52 52.134341488   17.76 15.96 17.9   ~ 123 0
24 V* V2361 Cyg No* 20 09 19.05 +39 48 52.9           ~ 37 0
25 V* V2467 Cyg No* 20 28 12.4766190480 +41 48 36.387108828   20.0   18.5   ~ 47 0
26 V* V2362 Cyg CV* 21 11 32.3419758636 +44 48 03.668158208           ~ 105 0
27 V* V455 And CV* 23 34 01.4484962496 +39 21 40.866079356   16.22 16.09 16.14   ~ 145 0

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