HighK-band surface brightness fluctuations in NGC 1427 and NGC 720
نویسندگان
چکیده
منابع مشابه
Anomalous Surface Brightness Fluctuations in NGC 4489 ⋆
Anomalously high K-band surface brightness fluctuations (SBF) have been reported in NGC 4489 by Pahre & Mould (1994), Jensen et al. (1996) and Jensen et al. (1998). However, these conclusions were uncertain because of relatively low signal-to-noise data. New high signal-to-noise data for NGC 4489 have been obtained at the NOAO/KPNO 2.1m and the ESO/La Silla 3.5m NTT telescopes. Adopting the I-b...
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We have measured the Hubble constant H0 in NGC 564 at cz ≈ 5800 km s −1 and in NGC 7619 at cz ≈ 3700 km s −1 with deep I–band Surface Brightness Fluctuation distance measurements at the ESO Very Large Telescope (VLT). We obtain H0 = 70 ± 7 ± 6 km s −1 /Mpc for NGC 564 and H0 = 68 ± 6 ± 6 for NGC 7619. The actual SBF sample used for the measurement of H0 in the Hubble Space Telescope Key Project...
متن کاملA Galaxy Cluster near Ngc 720
The galaxy cluster RXJ 0152.7-1357 is emitting X-rays at the high rate of 148 counts ks −1. It would be one of the most luminous X-ray clusters known if it is at its redshift distance of z = .8325. It is conspicuously elongated, however, toward the bright, X-ray active galaxy NGC 720 about 14 arcmin away. At the same distance on the other side of NGC 720, and almost perfectly aligned, is an X-r...
متن کاملInfrared Surface Brightness Fluctuations of the Coma Elliptical Ngc 4874 and the Value of the Hubble Constant
We have used the Keck I Telescope to measure K-band surface brightness fluctuations (SBFs) of NGC 4874, the dominant elliptical galaxy in the Coma cluster. We use deep HST WFPC2 optical imaging to account for the contamination due to faint globular clusters and improved analysis techniques to derive measurements of the SBF apparent magnitude. Using a new SBF calibration which accounts for the d...
متن کاملElectron temperature fluctuations in NGC 346
Context. The existence and origin of large spatial temperature fluctuations in H ii regions and planetary nebulae are assumed to explain the differences between the heavy element abundances inferred from collisionally excited and recombination lines, although this interpretation remains significantly controversial. Aims. We investigate the spatial variation in electron temperature inside NGC 34...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20011018