Description:
Forum in astronomy/astrophysics research. (Moderated)
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CMB temperature: cooling down or... heating up???
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Hello. This is a strictly technical question related to famous Cosmic Microwave Background problem. As we know a couple of years ago Wilkinson Microwave Anisotropy Probe has measured detailed temperature of CMB with accuracy of 5 places after the dot, so it's value is now assumed to be 2,726xx degree Kelwin (correct me... more »
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"Fractal Cosmology" entry in Wikipedia
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Hello. Those are very interesting data. I think, that fractal clustering should be related somehow to the properties of empty space (the void itself) and I do not mean here old, well known multidimension (4-th or more) conceptions based on Riemann/Lobaczewski maths. In fact - fractal structure suggests... more »
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"Fractal Cosmology" entry in Wikipedia
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Recently an entry on the subject of "Fractal Cosmology" was added to Wikipedia. Better late than never. You might want to take a look since it may be an important paradigm for the 21st century. In a related development, Pietronero (paper in preparation, personal communication) has alerted me to the fact that the latest SDSS data... more »
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Reply to 2008ApJS..175..116L
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The paper 2008ApJS..175..116L comments about the QORG catalog (2004A&A...427..387F) that it missed the new-found bright QSO SNUQSO J003236.59-091026.2 because it "could have been in the QORG catalog, but it appears that the quasar was mismatched to a star with i = 13.8 mag, 6'' away from SNUQSO J003236.59-091026.2.".... more »
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Wide Gravitational Lens Candidate (52" across) -- negative result
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The 52"-across gravitational lens candidate which I reported in this newsgroup has been definitively observed and data reduced. It is not a lens. CXOMP J041649.0-554702 is a QSO, z~2.5, as previously reported. CXOMP J041655.0-554721 is a Seyfert 1. They are both broad-line emitters which accounts for some of the spectral... more »
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Zwicky and modified gravity in his 1957 book
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Hi all, In Bekenstein's review, astro-ph/0701848 he had mentioned that Zwicky had expressed a doubt on validity of gravity (because of the need to account for dark matter) in his 1957 book 'Morphological Astronomy". Can someone who has read this bok point me to the exact page/section where Zwicky expresses his doubt? I don't think this fact is widely... more »
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A Question about Planet Formation
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Three days ago (4/10) I posted the below article under the same thread title to sci.astro, but nobody there could give me a decent answer. So now I am posting it here with hopes for better luck. Perhaps what I should have said on sci.astro is: Please keep in mind that what I talk about here appears to be a systematic effect.... more »
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The nSigma Parameter in the SDSS
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Hello. I am trying to find a verbose description of what the "nSigma" parameter in the SDSS actually represents. According to the Schema Browser page, it is the "Significance of line number of sigma". Could someone give me a description of what that actually means? I'm assuming that an nSigma of 3 means that the error or standard... more »
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Galactic rotation
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I am doing some research for a book and I hope someone here can help me with a question. What is the ratio of the number of galaxies rotating clockwise vs anti-clockwise relative to some arbitrary vector? I will post a summary of answers. Thanks in advance. Kind regards, @a
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Interstellar Absorption Coefficient
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I am trying to work out how the distance modulus given by Riess et al as mu(o) = m-M = 5 log LD + 25, on p 28 of astro-ph/0611572v2, relates to the distance modulus given by Riess as mu(mag) in [link]. Presumably they are related by the interstellar absorption... more »
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