2000ApJ...544..293I

Query : 2000ApJ...544..293I

2000ApJ...544..293I - Astrophys. J., 544, 293-301 (2000/November-3)

The X-ray-faint early-type galaxy NGC 4697.

IRWIN J.A., SARAZIN C.L. and BREGMAN J.N.

Abstract (from CDS):

We analyze archival ROSAT HRI, ROSAT PSPC, and ASCA data of the X-ray-faint early-type galaxy NGC 4697. The joint ROSAT PSPC+ASCA spectrum is fitted by a two-component thermal model, a MEKAL model with kTMEKAL=0.26+0.04–0.03 keV with low metallicity and a bremsstrahlung model with kTBREM=5.2+3.0–1.6 keV. A similar model was found to fit the spectra of another faint early-type galaxy (NGC 4382) and the bulge of M31. We interpret this soft emission as a combination of emission from a soft component of low-mass X-ray binaries (LMXBs) and from a low-temperature interstellar medium, although the relative contributions of the two components could not be determined. Twelve point sources were identified within 4' of NGC 4697, of which 11 are most likely LMXBs associated with the galaxy. The soft X-ray colors of four of the LMXBs in NGC 4697 support the claim that LMXBs possess a soft spectral component. Finally, we present a simulation of what we believe the Chandra data of NGC 4697 will look like.

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Journal keyword(s): Stars: Binaries: Close - Galaxies: Elliptical and Lenticular, cD - Galaxies: ISM - X-Rays: Galaxies - X-Rays: ISM - X-Rays: Stars

Nomenclature: Table 1: [ISB2000] NN (Nos 1-12).

Simbad objects: 21

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Number of rows : 21
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 NGC 1269 EmG 03 17 18.5785534752 -41 06 28.628735184 9.85 9.83 8.81 8.72   ~ 445 1
3 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 678 0
4 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
5 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 570 0
6 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1156 1
7 CXOU J124827.3-054707 X 12 48 27.13 -05 47 05.3           ~ 3 0
8 CXOU J124830.8-054836 GlC 12 48 30.54 -05 48 34.3           ~ 4 0
9 [ISB2000] 3 X 12 48 32.05 -05 48 14.1           ~ 1 0
10 [ISB2000] 4 LXB 12 48 32.6612994976 -05 48 51.101238909           ~ 4 0
11 [ZGV2011] 144 LXB 12 48 33.21 -05 47 41.9           ~ 6 0
12 [ISB2000] 6 X 12 48 34.3245546360 -05 50 51.806143392           ~ 3 0
13 [ISB2000] 8 X 12 48 35.68 -05 47 54.3           ~ 1 0
14 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0
15 [ZGV2011] 145 LXB 12 48 39.32 -05 48 07.2           ~ 6 0
16 CXOU J124845.4-054541 X 12 48 45.41 -05 45 40.1           ~ 3 0
17 CXOU J124846.8-054852 AGN 12 48 46.77 -05 48 51.1           ~ 3 0
18 CXOU J124847.4-054512 X 12 48 47.42 -05 45 10.0           ~ 2 0
19 NGC 5102 EmG 13 21 57.6100832352 -36 37 48.395156160   9.74 9.65 8.47 10.2 ~ 389 1
20 V* UW CrB LXB 16 05 45.8746697208 +25 51 45.246497976     19.7     ~ 78 0
21 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0

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