By George Gamow
Over a hundred and twenty pleasant pen-and-ink illustrations via the writer upload one other size of good-natured allure to those wide-ranging explorations. A mind-expanding quantity for the layman and the science-minded. "This is a layman's booklet as readable as a ancient novel, yet each bankruptcy bears the cast imprint of authoritative research." — San Francisco Chronicle.
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Extra resources for One Two Three . . . Infinity: Facts and Speculations of Science
4 The color proﬁle of the nucleus of M33 based on HST Planetary Camera two images (Lauer et al. 1998). 1 FWHM (aresec) Fig. 5 The size of the nucleus (full-width-halfmaximum, in arcsec) as a function of the wavelength of the light (From data published by Dubus et al. 02 0 0 5000 10000 15000 Wavelength (Angstroms) The question of whether the color gradient was the result of abundance differences in the stars or of age differences was settled by the ultraviolet measurements made by Dubus et al. (1999).
The diameter of the disk in the optical is a matter of debate. 3 kpc, but searches for more distant disk stars suggest that it extends considerably farther. 6 The Inner Disk and Bulge Is there a bulge in the inner region of M33? This question has a long history of conﬂicting claims. First reported by Patterson (1940), who made one of the early photometric studies of M33, it was subsequently unnoticed in the scans made by de Vaucouleurs (1959). The blue and near-infrared images published by Walker showed a smooth population of red stars in the central region and Boulesteix (1979) detected a faint bulge component making up only a hundredth the luminosity of the disk component.
These provided resolution at M33 ranging from 180 to 1200 pc, sufﬁcient to study the large-scale structure and a few bright sources. 12 provides surface brightness contour maps at these four wavelengths. 10 Infrared Structure 39 Fig. 11 The proﬁle of the H-band emission from M33 (small dots). The dashed line is the deconvolved exponential component, the dotted line the spheroidal component and the solid line the composite, ﬁt to the observations (From Regan and Vogel 1994). Used by permission, copyright AAS The structure of the disk in the infrared was derived from the IRAS map using elliptical annuli and solving for the median brightness for each annulus.
One Two Three . . . Infinity: Facts and Speculations of Science by George Gamow