A Variable Radio-Quiet Compact Galaxy i ZW 1727 + 50
نویسندگان
چکیده
منابع مشابه
Astronomy and Astrophysics Is I Zw 18 a Young Galaxy?
Hubble Space Telescope (HST) colour magnitude diagrams in B, V and R along with long-slit Multiple Mirror Telescope (MMT) spectrophotometric data are used to investigate the evolutionary status of the nearby blue compact dwarf (BCD) galaxy I Zw 18. We find that the distance to I Zw 18 should be as high as 20 Mpc, twice the previously accepted distance, to be consistent with existing observation...
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Three hundred fifty three radio sources from the NRAO VLA Sky Survey (NVSS) (Condon et al. 1998) and the FIRST Survey (White et al. 1997), are detected in the areas of 179 Shakhbazian Compact Groups (ShCGs) of galaxies. Ninety three of them are identified with galaxies in 74 ShCGs. Six radio sources have complex structure. The radio spectra of 22 sources are determined. Radio luminosities of ga...
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Radio-quiet QSO environments-I. The correlation of QSOs and b J < 23 galaxies. ABSTRACT In this paper we present results of an analysis of radio-quiet QSO environments. The aim is to determine the relation between QSOs, galaxies and the mass distribution as a function of redshift. We cross-correlate a sample of ∼ 150 QSOs from optically and X-ray selected catalogues with faint, b J < 23, galaxi...
متن کاملDeep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation
We present V and I photometry of the resolved stars in the most metal-deficient blue compact dwarf galaxy known, I Zw 18 (Z⊙/50), using Hubble Space Telescope/Advanced Camera for Surveys (ACS) images, the deepest ones ever obtained for this galaxy. The resulting I vs. V − I color-magnitude diagram (CMD) reaches limiting magnitudes V = I = 29 mag. It reveals a young stellar population of blue ma...
متن کاملRadio Detection of Radio-quiet Galaxies
We investigate the radio emission of ∼ 185,000 quiescent (optically unclassifiable) galaxies selected from the Sloan Digital Sky Survey (SDSS). By median-stacking FIRST cutouts centered on the optically-selected sources, we are able to reach flux densities down to the 10s of μJy. The quiescent galaxy sample is composed of two subgroups inhabiting vastly different regimes: those targeted for the...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1967
ISSN: 0004-637X,1538-4357
DOI: 10.1086/180119