2011A&A...536A.103Z


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.21CEST15:58:50

2011A&A...536A.103Z - Astronomy and Astrophysics, volume 536A, 103-103 (2011/12-1)

Supernovae without host galaxies? Hypervelocity stars in foreign galaxies.

ZINN P.-C., GRUNDEN P. and BOMANS D.J.

Abstract (from CDS):

Harvesting the SAI supernova catalog, the most complete list of supernovae (SNe) currently available, we search for SNe that apparently do not occur within a distinct host galaxy but lie a great distance (several arcmin) apart from the host galaxy given in the catalog or even show no sign of an identifiable galaxy in their direct vicinity. We attempt to distinguish between two possible explanations of this host-lessness of a fraction of reported SNe, namely (i) that a host galaxy is too faint (of too low surface brightness) to be detected within the limits of currently available surveys (presumably a low surface brightness galaxy) or (ii) the progenitor of the SN is a hypervelocity star (HVS) that exploded kiloparsecs away from its host galaxy. We use deep imaging to test the first explanation. If no galaxy is identified within our detection limit of ∼27mag/arcsec2, which is the central surface brightness of the faintest known LSB galaxy so far, we discard this explanation and propose that the SN, after several other checks, had a hypervelocity star progenitor. We focus on observations for which this is the case and give lower limits to the actual space velocities of the progenitors, making them the first hypervelocity stars known in galaxies other than our own Milky Way. Analyzing a selected subsample of five host-less SNe, we find one, SN2006bx in UGC5434, is a possible hypervelocity progenitor category with a high probability, exhibiting a projected velocity of ∼800km/s. SN1969L in NGC1058 is most likely an example of a very extended star-forming disk visible only in the far-UV, but not in the optical wavebands. Therefore, this SN is clearly due to in situ star formation. This mechanism may also apply to two other SNe that we investigated (SN1970L and SN1997C), but this cannot be determined with certainty. Another SN, SN 2005nc which is associated with a gamma-ray burst (GRB050525), is a special case that is not covered by our initial assumptions. Even with deep Hubble Space Telescope data, a host galaxy cannot be unambiguously identified.

Abstract Copyright:

Journal keyword(s): stars: massive - supernovae: general - stars: kinematics and dynamics - supernovae: individual: SN 2006bx

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10526 1
2 SN 2005A SN* 02 30 43.25 -02 56 19.8     17.1     SN.Ia 43 1
3 NGC 1058 Sy2 02 43 30.0247243235 +37 20 28.807743477   12.29 11.75 10.85   ~ 424 0
4 SN 1969L SN* 02 43 45 +37 18.7   13.2 13.2     SN.IIP 115 1
5 HE 0437-5439 HS* 04 38 12.7828185490 -54 33 11.840105637 15.37 16.18 16.42     sdB+F 59 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14243 1
7 HD 271791 HV* 06 02 27.8790251794 -66 47 28.696003716   12.17 12.28     B2(III) 49 0
8 NGC 2968 GiP 09 43 12.0256286658 +31 55 43.358563664 16.85 15.72 14.25 13.43 12.50 ~ 109 0
9 SN 1970L SN* 09 43 20 +31 57.1   13.0       SNI 28 1
10 NGC 2970 GiP 09 43 31.0661473428 +31 58 37.134157365   14.7       ~ 48 0
11 UGC 5431 G 10 04 59.24 +21 32 16.9   16.0       ~ 13 0
12 UGC 5434 G 10 05 13.4892591213 +21 27 21.487980238   14.8       ~ 21 1
13 SN 2006bx SN* 10 05 14.16 +21 28 32.0     18.1     SN.II 10 1
14 NGC 3158 GiG 10 13 50.527 +38 45 53.68   13.4       ~ 90 0
15 NGC 3160 Sy2 10 13 55.027 +38 50 34.70   15.2       ~ 48 0
16 SN 1997C SN* 10 13 56.18 +38 49 00.5     17.5     SNIa 13 1
17 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 242 1
18 SN 1991bg SN* 12 25 03.70 +12 52 15.6   14.75 14.3     SN.IaPec 516 1
19 SN 2009Z SN* 14 01 53.61 -01 20 30.2           ~ 11 1
20 2dFGRS TGN271Z016 LSB 14 01 53.803 -01 20 35.57   18.6       ~ 7 0
21 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10927 0
22 GRB 050525A gB 18 32 32.560 +26 20 22.34 14.19 15.17 13.91     SN.Ic: 340 1
23 Anon J183232+2620 G 18 32 32.58 +26 20 22.6           ~ 7 0
24 NAME HDF-S reg 22 32 56 -60 33.0           ~ 534 0

    Equat.    Gal    SGal    Ecl

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2019.09.21-15:58:50

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