ar X iv : a st ro - p h / 02 02 43 1 v 2 1 4 Ju n 20 02 Chandra view of the dynamically young cluster of galaxies A 1367 II . point sources
نویسندگان
چکیده
A 40 ks Chandra ACIS-S observation of the dynamically young cluster A1367 yields new insights on X-ray emission from cluster member galaxies. We detect 59 point-like sources in the ACIS field, of which 8 are identified with known cluster member galaxies. Thus, in total 10 member galaxies are detected in X-rays when three galaxies discussed in paper I (Sun & Murray 2002; NGC 3860 is discussed in both papers) are included. The superior spatial resolution and good spectroscopy capability of Chandra allow us to constrain the emission nature of these galaxies. Central nuclei, thermal halos and stellar components are revealed in their spectra. Two new low luminosity nuclei (LLAGN) are found, including an absorbed one (NGC 3861). Besides these two for sure, two new candidates of LLAGN are also found. This discovery makes the LLAGN/AGN content in this part of A1367 very high (> ∼ 12%). Thermal halos with temperatures around 0.5-0.8 keV are revealed in the spectra of NGC 3842 and NGC 3837, which suggests that Galactic coronae can survive in clusters and heat conduction must be suppressed. The X-ray spectrum of NGC 3862 (3C 264) resembles a BL Lac object with a photon index of ∼ 2.5. We also present an analysis of other point sources in the field and discuss the apparent source excess (∼ 2.5 σ) in the central field.
منابع مشابه
ar X iv : a st ro - p h / 02 02 43 1 v 1 2 2 Fe b 20 02 Chandra view of the dynamically young cluster of galaxies A 1367 II . point sources
A 40 ks Chandra ACIS-S observation of the dynamically young cluster A1367 yields new insights on X-ray emission from cluster member galaxies. We detect 59 point-like sources in the ACIS field, of which 8 are identified with known cluster member galaxies. Thus in total 10 member galaxies are detected in X-rays when three galaxies discussed in paper I (Sun & Murray 2002; NGC 3860 is discussed in ...
متن کاملar X iv : a st ro - p h / 02 06 25 5 v 1 1 4 Ju n 20 02 Chandra view of the dynamically young cluster of galaxies A 1367 I . small - scale structures
The 40 ks Chandra ACIS-S observation of A1367 provides new insights into small-scale structures and point sources in this dynamically young cluster. Here we concentrate on small-scale extended structures. A ridge-like structure around the center (" the ridge ") is significant in the Chandra image. The ridge, with a projected length of ∼ 8 arcmin (or 300 h −1 0.5 kpc), is elongated from northwes...
متن کاملar X iv : a st ro - p h / 02 02 31 1 v 1 1 6 Fe b 20 02 The Chandra Deep Field - North Survey
Chandra has performed a 1.4 Ms survey centred on the Hubble Deep Field-North (HDF-N), probing the X-ray Universe 55–550 times deeper than was possible with pre-Chandra missions. We describe the detected point and extended X-ray sources and discuss their overall multiwavelength (optical, infrared, submillimeter, and radio) properties. Special attention is paid to the HDF-N X-ray sources, luminou...
متن کاملar X iv : a st ro - p h / 98 02 02 7 v 1 3 F eb 1 99 8 Recalibration of Luminosity –
A recalibration of the luminosity–linewidth technique is discussed which introduces (i) new cluster calibration data, (ii) new corrections for reddening as a function of inclination, and (iii) a new zero-point calibration using 13 galaxies with distances determined via the cepheid period– luminosity method. It is found that H 0 = 82 ± 16 km s −1 Mpc −1 (95% confidence).
متن کاملar X iv : a st ro - p h / 02 06 46 6 v 1 2 6 Ju n 20 02 X - ray Detection of the Inner Jet in the Radio Galaxy 3 C 129
During the course of an investigation on the interaction of the radio galaxy 3C129 and its ambient cluster gas, we found excess X-ray emission aligned with the northern radio jet. The emission extends from the weak X-ray core of the host galaxy ≈ 2.5 to the first resolved radio knot. On a smaller scale, we have also detected a weak radio extension in the same position angle with the VLBA. Altho...
متن کامل