2017ApJ...848L..30P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET11:11:14

2017ApJ...848L..30P - Astrophys. J., 848, L30-L30 (2017/October-3)

The old host-galaxy environment of SSS17a, the first electromagnetic counterpart to a gravitational-wave source.

PAN Y.-C., KILPATRICK C.D., SIMON J.D., XHAKAJ E., BOUTSIA K., COULTER D.A., DROUT M.R., FOLEY R.J., KASEN D., MORRELL N., MURGUIA-BERTHIER A., OSIP D., PIRO A.L., PROCHASKA J.X., RAMIREZ-RUIZ E., REST A., ROJAS-BRAVO C., SHAPPEE B.J. and SIEBERT M.R.

Abstract (from CDS):

We present an analysis of the host-galaxy environment of Swope Supernova Survey 2017a (SSS17a), the discovery of an electromagnetic counterpart to a gravitational-wave source, GW170817. SSS17a occurred 1.9 kpc (in projection; 10.''2) from the nucleus of NGC 4993, an S0 galaxy at a distance of 40 Mpc. We present a Hubble Space Telescope (HST) pre-trigger image of NGC 4993, Magellan optical spectroscopy of the nucleus of NGC 4993 and the location of SSS17a, and broadband UV-through-IR photometry of NGC 4993. The spectrum and broadband spectral-energy distribution indicate that NGC 4993 has a stellar mass of log(M/M)=10.49–0.20+0.08 and star formation rate of 0.003 M yr–1, and the progenitor system of SSS17a likely had an age of >2.8 Gyr. There is no counterpart at the position of SSS17a in the HST pre-trigger image, indicating that the progenitor system had an absolute magnitude MV -5.8 mag. We detect dust lanes extending out to almost the position of SSS17a and >100 likely globular clusters associated with NGC 4993. The offset of SSS17a is similar to many short gamma-ray-burst offsets, and its progenitor system was likely bound to NGC 4993. The environment of SSS17a is consistent with an old progenitor system such as a binary neutron star system.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: NGC 4993 - stars: individual: SSS17a - stars: individual: SSS17a

Simbad objects: 3

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Number of rows : 3

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 NGC 4993 GiG 13 09 47.706 -23 23 01.79   13.34   11.92   ~ 245 0
2 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 1011 0
3 LP 916-15 PM* 15 38 59.6477173130 -28 35 36.970418054   12.19 11.62     A 107 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-11:11:14

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