Photograph of the Nebula M 74 Piscium

Newton OBSERVATIONS OF THE SPIRAL GALAXY M 74 ( NGC

The face-on spiral galaxy M 74 (NGC 628) was observed by XMM-Newton on 2002 February 2. In total, 21 sources are found in the inner 5 from the nucleus (after rejection of a few sources associated to foreground stars). Hardness ratios suggest that about half of them belong to the galaxy. The higher-luminosity end of the luminosity function is fitted by a power-law of slope −0.8. This can be inte...

Optical spectrum of the planetary nebula M 2 - 24

We have obtained medium-resolution, deep optical long-slit spectra of the bulge planetary nebula (PN) M 2-24. The spectrum covers the wavelength range from 3610–7330Å. Over two hundred emission lines have been detected. The spectra show a variety of optical recombination lines (ORLs) from C, N, O and Ne ions. The diagnostic diagram shows significant density and temperature variations across the...

0 the “ Twin Jet ” Planetary Nebula M 2 – 9

We present a model for the structure, temporal behavior, and evolutionary status of the bipolar nebula M2−9. According to this model the system consists of an AGB or post-AGB star and a hot white dwarf companion, with an orbital period of about 120 years. The white dwarf has undergone a symbiotic nova eruption about 1200 years ago, followed by a supersoft x-ray source phase. The positional shif...

Intense molecular emission from the Lagoon nebula , M 8

The discovery is reported of the second strongest source ofmmand submmwavelengthCO line emission, towards M8, the Lagoon Nebula in Sagittarius. The∼31M molecular core has dimensions∼0.2×0.3 pc and is centred on theO7V star Herschel 36 (H 36), near the Hourglass Nebula in the core of M8. Emission from the CO line wings extends to the north and south of the Hourglass, although a lack of near-IR H...

A Musical Photograph?