The molecular structure of CRL 618

Bibcode
1992A&A...260..283P
Phillips, J. P.; Williams, P. G.; Mampaso, A.; Ukita, N.
Bibliographical reference

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 283-292.

Advertised on:
7
1992
Number of authors
4
IAC number of authors
2
Citations
15
Refereed citations
13
Description
Spectroscopy and mapping of the type I postmain-sequence source CRL 618, taken with the 45-m antenna of the Nobeyama Radio Observatory and the 12-m NRAO facility at Kitty Peak, are presented. It is shown that the exterior constant velocity envelope has a typical aspect ratio of about 0.8, extends over a range not less than 70 arcsec, and has an FWHM close to about 50 arcsec. Spatial-velocity maps through the nucleus reveal appreciable asymmetries in right ascension, with emission peaking towards about V(lsr) of -25 km/s for easterly offset locations, and about -15 km/s towards the west. These characteristics may arise from a mix of transverse expansion in the bipolar lobes, radial expansion within the outflow cavities, and shock deceleration of the interior H I/H II wind.
Type
Refereed
Carbon stars

It may interest you

  • Refereed
    Calibrating the Clock of JWST
    JWST, despite not being designed to observe astrophysical phenomena that vary on rapid timescales, can be an unparalleled tool for such studies. If timing systematics can be controlled, JWST will be able to open up the subsecond infrared timescale regime. Rapid time-domain studies, such as lag measurements in accreting compact objects and solar
    Dhillon, V. S. et al.

    Advertised on:

    1
    2025
    Bibcode
    2025AJ....169...21S
    Citations
    0
  • Refereed
    Comparing metallicity correlations in nearby non-AGN and AGN-host galaxies
    The gas-phase metallicity distribution within galaxies records critical information about galactic evolution. In this work, we investigate how active galactic nuclei (AGNs) influence this distribution by measuring the two-point correlation functions of gas-phase metallicity in 95 non-AGN and 37 AGN-host galaxies from the Calar Alto Legacy Integral
    Li, Song-Lin et al.

    Advertised on:

    1
    2025
    Bibcode
    2025MNRAS.536..430L
    Citations
    1
  • Refereed
    Why do some ultra diffuse Galaxies have rich globular cluster systems?
    Some ultra diffuse galaxies (UDGs) reveal many more globular clusters (GCs) than classical dwarf galaxies of the same stellar mass. These UDGs, with a mass in their GC system ( $M_{\rm GC}$) approaching 10 per cent of their host galaxy stellar mass ( $M_{\ast }$), are also inferred to have high halo mass to stellar mass ratios ( $M_{\rm halo}/M_{
    Forbes, Duncan A. et al.

    Advertised on:

    1
    2025
    Bibcode
    2025MNRAS.536.1217F
    Citations
    0