2020MNRAS.494L...1S

Query : 2020MNRAS.494L...1S

2020MNRAS.494L...1S - Mon. Not. R. Astron. Soc., 494, L1-L5 (2020/May-1)

Discovering novae in early-type galaxies with MUSE: A chance find in NGC 1404, and 12 more candidates from an archival search.

SMITH R.J.

Abstract (from CDS):

I report the discovery of a transient broad-Hα point source in the outskirts of the giant elliptical galaxy NGC 1404, discovered in archival observations taken with the Multi-Unit Spectroscopic Explorer (MUSE) integral field spectrograph. The Hα line width of 1950 km s–1 full width at half-maximum, and luminosity of (4.1 ± 0.1) x 1036 erg s–1, are consistent with a nova outburst, and the source is not visible in MUSE data obtained 9 months later. A transient soft X-ray source was detected at the same position (within <1 arcsec), 14 yr before the Hα transient. If the X-ray and Hα emission are from the same object, the source may be a short-time-scale recurrent nova with a massive white dwarf accretor, and hence a possible Type-Ia supernova progenitor. Selecting broad-Hα point sources in MUSE archival observations for a set of nearby early-type galaxies, I discovered 12 more nova candidates with similar properties to the NGC 1404 source, including five in NGC 1380 and four in NGC 4365. Multi-epoch data are available for four of these twelve sources; all four are confirmed to be transient on ∼1 yr time-scales, supporting their identification as novae.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): novae, cataclysmic variables - galaxies: elliptical and lenticular, cD

Nomenclature: Table 1: [S2020] NGCNNNN-SN N=13.

CDS comments: NGC 1404-X34 is CXOGSG J033851.4-353503 in Simbad.

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 RX J0045.4+4154 No* 00 45 28.80 +41 54 10.1           ~ 263 1
3 [S2020] NGC584-S1 No? 01 31 18.28 -06 52 37.0           ~ 1 0
4 NGC 584 Sy2 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 417 2
5 NGC 1332 GiP 03 26 17.321 -21 20 07.33   11.45   9.84   ~ 378 0
6 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 460 1
7 [S2020] NGC1380-S4 No? 03 36 28.47 -34 58 07.2           ~ 1 0
8 [S2020] NGC1380-S3 No? 03 36 28.55 -34 58 57.0           ~ 1 0
9 [S2020] NGC1380-S2 No? 03 36 29.47 -34 57 57.2           ~ 1 0
10 [S2020] NGC1380-S5 No? 03 36 29.47 -34 57 25.3           ~ 1 0
11 [S2020] NGC1380-S1 No? 03 36 29.61 -34 57 35.2           ~ 1 0
12 [S2020] NGC1399-S1 No? 03 38 27.75 -35 27 11.7           ~ 1 0
13 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
14 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
15 [S2020] NGC1404-S2 No? 03 38 51.08 -35 35 17.8           ~ 1 0
16 CXOGSG J033851.4-353503 No? 03 38 51.54 -35 35 01.5           ~ 1 0
17 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
18 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
19 NGC 1428 GiG 03 42 22.73 -35 09 14.4   13.77   12.49   ~ 125 0
20 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
21 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
22 NGC 3311 EmG 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 310 2
23 [S2020] NGC4365-S4 No? 12 24 26.91 +07 18 53.5           ~ 1 0
24 [S2020] NGC4365-S1 No? 12 24 28.01 +07 18 49.1           ~ 1 0
25 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 871 0
26 [S2020] NGC4365-S2 No? 12 24 28.50 +07 19 33.5           ~ 1 0
27 [S2020] NGC4365-S3 No? 12 24 29.41 +07 19 23.9           ~ 1 0
28 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
29 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 671 1
30 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
31 NGC 5419 rG 14 03 38.7225244848 -33 58 41.881842120   11.77 11.33 10.21 14.44 ~ 208 3
32 NAME Local Group GrG ~ ~           ~ 9325 0

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