Supernovae without host galaxies? - Hypervelocity stars in foreign galaxies

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Volume 536 (December 2011)

A&A, 536 (2011) A103

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Table 1

Summary of the galaxy/supernova sample investigated in this work.

Galaxy	Type	Assoc. SN	RA (J2000)^a	Dec (J2000)^a	Galaxy V-mag	SN mag^b	D₂₅^c	Distance^d	Linear scale
			h:m:s	d:m:s	AB-mag	mag	arcsec	Mpc	kpc/′′

NGC 1058	SA	SN 1969L	02:43:30	+37:20:29	11.20	12.8	90.6 × 84.6	7.3	0.035
NGC 2968	I0	SN 1970L	09:43:12	+31:55:43	11.73	13.0	60.4 × 46.8	22.0	0.110
NGC 3160	S	SN 1997C	10:13:55	+38:50:34	14.17	17.5	63.9 × 12.9	97.0	0.460
???	???	SN 2005nc	18:32:32	+26:20:23	>27.4	???	???	2233.3	6.725
UGC 5434	SAB	SN 2006bx	10:05:13	+21:27:21	14.21	18.1	38.5 × 24.0	78.3	0.373

Notes. All quantities given below were taken from the NASA Extragalactic Database (NED).

^(a)

For all galaxies, the center coordinates are given, except for SN 2005nc where there is no host galaxy, hence the SN coordinates are provided.

^(b)

Magnitude of the supernova as given in the initial CBAT discovery notice (therefore not necessarily AB system, mostly clear filter). Note that all magnitudes are consistent with the supernova being in their respective host galaxy using the standard candle relationships from Drout et al. (2011) and Kasen & Woosley (2009) for type I resp. type II supernovae.

^(c)

The isophotes were taken from the SDSS database and are measured in the r-band (except for NGC 1058 which is not within the SDSS coverage, hence an RC3 B-band value is used).

^(d)

For NGC 1058, and NGC 2968, the distances were estimated using the Tully-Fisher relation. All other distances were calculated using the redshift of the corresponding galaxy and a flat ΛCDM cosmology as described in Sect. 1.

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