2010A&A...517A..91S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST01:44:59

2010A&A...517A..91S - Astronomy and Astrophysics, volume 517, A91-91 (2010/7-1)

A search for supernova remnants in the nearby spiral galaxy M74 (NGC 628).

SONBAS E., AKYUEZ A., BALMAN S. and OEZEL M.E.

Abstract (from CDS):

An optical search was carried out for supernova remnants (SNRs) in the Sc type nearby spiral galaxy M74, using ground-based observations at the TUBITAK National Observatory (TUG, Antalya/Turkey) and the Special Astrophysics Observatory (SAO, Russia). Observations were supplemented by the spectral analysis of archived X-ray data from XMM-Newton and Chandra. The survey of M74 covered ∼9 arcmin2 with [SII], Hα, and their continuum filters. Interference filter images of M74 were obtained the with the 1.5m Russian Turkish Telescope (RTT150) at TUG and spectral data taken with the 6m Bolsoi Azimuthal Telescope (BTA) at SAO. The emission nebulae with continuum-subtracted line ratio values of [SII]λλ6716,6731/Hα≥0.4 are identified as SNRs. Follow-up spectroscopy confirmed optical SNR identifications. We have identified nine new SNR candidates in M74 with [SII]/Hα≥0.4 as the basic criterion. The [S II]/Hα ratio ranges from 0.40 to 0.91 and Hα intensities from 2.8x10–15erg/cm2/s to 1.7x10–14erg/cm2/s. We also present spectral follow-up observations of these SNR candidates, however, we are able to spectrally confirm only three of them (SNR2, SNR3, and SNR5). The lack of confirmation for the rest might come from contamination by the nearby H II emission regions, as well as from the inaccurate positioning of the long slit on these objects. In addition, we searched the XMM-Newton and Chandra Observatory archival data for the X-ray counterparts to the optically identified candidates. We find positional coincidence with only three SNR candidates, SNR1, SNR2, and SNR8. The spectrum of SNR2 yields a shock temperature of 10.8keV with an ionization timescale of 1.6x1010 s/cm3, indicating a relatively young remnant in an early Sedov phase, which is not supported by our optical wavelength analysis. Given the high luminosity of 1039erg/s and the characteristics of the X-ray spectrum, we favor an ultra luminous X-ray source interpretation for this source associated with an SNR. We calculated an X-ray flux upper limit of 9.0x10–15erg/cm2/s for the rest of the SNRs, including spectroscopically identified SNR3 and SNR5.

Abstract Copyright:

Journal keyword(s): galaxies: groups: individual: M74 (NGC 628) - ISM: supernova remnants - galaxies: ISM

Nomenclature: Fig. 1, Table 2: [SAB2010] SNRN (Nos SNR1-SNR9).

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 2002ap SN* 01 36 23.85 +15 45 13.2   13.11 14.54     SNIc-BL 491 1
2 [SAB2010] SNR2 SR? 01 36 31.50 +15 48 50.3           ~ 3 0
3 2XMM J013636.4+155036 UX? 01 36 36.50 +15 50 36.3           ~ 10 0
4 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1400 1
5 [SAB2010] SNR9 SR? 01 36 42.40 +15 44 16.3           ~ 3 0
6 SN 2003gd SN* 01 36 42.65 +15 44 19.9     13.2     SNIIP 215 2
7 CXOU J013644.0+154908 SR? 01 36 43.80 +15 49 12.7           ~ 3 0
8 [SAB2010] SNR6 SR? 01 36 45.10 +15 45 25.3           ~ 3 0
9 [SAB2010] SNR4 SR? 01 36 45.30 +15 43 06.6           ~ 3 0
10 [SAB2010] SNR8 SR? 01 36 45.90 +15 44 27.1           ~ 3 0
11 [SAB2010] SNR7 SR? 01 36 45.90 +15 44 46.1           ~ 3 0
12 [SAB2010] SNR3 SR? 01 36 46.90 +15 45 15.2           ~ 3 0
13 [SAB2010] SNR5 SR? 01 36 48.90 +15 43 34.4           ~ 3 0
14 CXOU J013651.1+154547 UX? 01 36 51.06 +15 45 46.8           ~ 25 0
15 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1606 1
16 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 985 3
17 [MF97] M 81 19 SNR 09 55 21.70 +69 08 32.0           ~ 4 0
18 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
19 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2228 2
20 [MF97] M 101 39 SNR 14 03 09.00 +54 16 25.2           ~ 3 0
21 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2544 2
22 [MF97] NGC 6946 5 SNR 20 34 37.60 +60 08 52.7           ~ 4 0
23 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2234 2

    Equat.    Gal    SGal    Ecl

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2020.07.04-01:44:59

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