X-Ray Detection of Brown Dwarfs with Chandra
نویسندگان
چکیده
منابع مشابه
X-ray Detection from Bona-fide and Candidate Brown Dwarfs in the ρ Ophiuchi Cloud with Chandra
We present results of an X-ray search from bona-fide and candidate brown dwarfs in the ρ Ophiuchi cloud cores with the Chandra X-ray Observatory. The selected areas are two fields near the cloud center and are observed with the ACIS-I array of a 17 × 17 size and a ∼100 ks exposure. Among 18 bona-fide and candidate brown dwarfs listed by the infrared spectroscopy, we find X-ray emission from 7 s...
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We report on two recent XMM-Newton observations of Brown Dwarfs in the Pleiades cluster and in the field aiming to constrain the age dependence of X-ray emission from substellar objects.
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We have detected a bright X-ray flare from the nearby (d =5.0 pc) brown dwarf LP 944-20 with the Chandra/ACIS-S. This is an old (500 Myr), rapidly rotating, lithium-bearing M9 object, with a bolometric luminosity of ≈ 6×1029 erg sec−1. It was only detected by Chandra during an X-ray flare of duration 1-2 hours near the end of a 12.1 hour observation. The peak X-ray luminosity was 1.2+0.5 −0.3×1...
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Some observations are adversely affected by bias-parity errors. To explore the properties of these errors, 16,304 bias-parity error files were obtained from the archive for the interval from the beginning of the mission through July 8, 2010. Figure 1 shows histograms of the total number and the “valid” number (see sec. 1.5) of errors for each file. The results for the valid errors are also list...
متن کاملCHANDRA Detection of 16 New X - Ray Sources
We have detected 18 sources over 6 σ threshold within two regions 8 ′ .3×16 ′ .9 and 8 ′ .3×33 ′ .6 in the vicinity of the point with α=03 h 31 m 02 s .45 (J2000) and δ=+43 • 47 ′ 58 ′′ .5 (J2000) using a CHAN DRA ACIS (S+I) observation. Two of the sources were detected before with ROSAT HRI and one source could be closely identified with a star in the optical catalog, USNO A-2. We have also st...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2003
ISSN: 0074-1809
DOI: 10.1017/s0074180900211108