X-ray flares from the ultra-luminous X-ray source in NGC 5408

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

X - ray flares from the ultra - luminous X - ray source in NGC 5408

We have studied an ultra-luminous X-ray source (ULX) in the dwarf galaxy NGC 5408 with a series of XMM-Newton observations, between 2001 July and 2003 January. We find that its X-ray spectrum is best fitted with a power law of photon index Γ ≈ 2.6–2.9 and a thermal component with blackbody temperature kT bb ≈ 0.12–0.14 keV. These spectral features, and the inferred luminosity ≈ 10 40 erg s −1 i...

متن کامل

The optical counterpart of the ultra - luminous x - ray source NGC 5204 X - 1 ⋆

We use archival HST/WFPC2 V and I band images to show that the optical counterpart to the ultra-luminous x-ray source NGC 5204 X-1, reported by Roberts et al., is composed of two sources separated by 0.5”. We have also identified a third source as a possible counterpart, which lies 0.8” from the nominal X-ray position. PSF fitting photometry yields V-band magnitudes of 20.3, 22.0 and 22.4 for t...

متن کامل

Luminous X-ray Flares from Low Mass X-ray Binary Candidates in the Early-type Galaxy Ngc

We report results of the first search specifically targeting short-timescale X-ray flares from low-mass X-ray binaries in an early-type galaxy. A new method for flare detection is presented. In NGC 4697, the nearest, optically luminous, X-ray faint elliptical galaxy, 3 out of 157 sources are found to display flares at > 99.95% probability, and all show more than one flare. Two sources are coinc...

متن کامل

A new luminous supersoft X - ray source in NGC 300

Context. We report the discovery of a new luminous supersoft source, XMMU J005455.0−374117, in the nearby spiral galaxy NGC 300, in XMM-Newton observations performed on 2005 May 22 and on 2005 November 25. The source is not present in ROSAT data nor in the previous XMM-Newton observations of 2000 December/2001 January. The unique luminous supersoft source, XMMU J005510.7−373855, detected in the...

متن کامل

A Luminous Recurrent Supersoft X-ray Source in Ngc 300

We report the results of XMM-Newton observations for an especially luminous supersoft X-ray source (SSS) with bolometric luminosity of 10 39 erg s −1 in the spiral galaxy NGC 300. The source was detected as a SSS in 1992 and disappeared in subsequent X-ray observations. The source was active again during recent XMM-Newton observations. It appeared to be very soft (kT ∼ 60 eV) and very luminous ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Astronomy & Astrophysics

سال: 2004

ISSN: 0004-6361,1432-0746

DOI: 10.1051/0004-6361:20041145