L1551 — LLMpedia

Contents

L1551 is a dark molecular cloud and star-forming region located in the Taurus Molecular Cloud complex near the Taurus (constellation), notable for active low-mass star formation, protostellar jets, and multiple Herbig–Haro objects. The cloud has been a focus of observational campaigns by facilities such as the Atacama Large Millimeter/submillimeter Array, the Very Large Array, and the Hubble Space Telescope, and has influenced theoretical work by researchers affiliated with institutions like the Max Planck Institute for Astronomy and the Harvard–Smithsonian Center for Astrophysics.

Overview

L1551 resides within the larger Taurus Molecular Cloud and is one of several nearby star-forming regions including Barnard 18, L1482, and L1495. Its proximity made it a prime target for surveys by the Infrared Astronomical Satellite, the Spitzer Space Telescope, and the Wide-field Infrared Survey Explorer. Studies by teams from the California Institute of Technology, the University of Arizona, and the National Radio Astronomy Observatory helped map its dust continuum and molecular lines. Observational programs like the Gould Belt Survey and projects at the James Clerk Maxwell Telescope and the Submillimeter Array have characterized its structure. L1551 has been referenced in catalogs maintained by the SIMBAD database and the Two Micron All Sky Survey.

The cloud’s molecular content has been probed using tracers such as CO, ^13CO, C^18O and NH3 by observers from the Institute for Radio Astronomy in the Millimeter Range and the Kavli Institute for Astronomy and Astrophysics. Measurements of extinction and dust emission using the Herschel Space Observatory and the Planck mission constrained column densities and temperature structure. Studies published through the Astrophysical Journal and Monthly Notices of the Royal Astronomical Society estimated the mass and identified dense cores similar to those in Perseus molecular cloud and Ophiuchus. Magnetic field morphology inferred from polarimetric observations with instruments like SCUBA-2 and facilities at the James Clerk Maxwell Telescope compared with models developed at Princeton University and University of Cambridge.

L1551 hosts several Class 0 and Class I protostars studied by collaborations including researchers at the Max Planck Institute for Radio Astronomy and the National Astronomical Observatory of Japan. Notable embedded sources were identified in surveys by Spitzer teams and in catalogs from the Two Micron All Sky Survey. Follow-up high-resolution imaging by the Very Large Array and the Atacama Large Millimeter/submillimeter Array resolved protoplanetary disks analogous to those observed around objects in the Orion Nebula and T Tauri systems. Theoretical interpretations were advanced by groups at Yale University and Columbia University using numerical codes like those developed at the Max Planck Institute for Astrophysics and compared with evolutionary tracks from the Geneva Observatory and pre-main-sequence models from the Bonnor–Ebert sphere tradition.

Powerful molecular outflows and collimated jets in L1551 have produced multiple Herbig–Haro objects cataloged alongside classical examples such as HH 1, HH 34, and HH 111. Observations with the Hubble Space Telescope, the Subaru Telescope, and the Gemini Observatory revealed shock structures similar to those studied by researchers at the Space Telescope Science Institute and the European Southern Observatory. Radio continuum work at the Very Large Array and millimeter interferometry at the Plateau de Bure Interferometer traced kinematics comparable to flows in NGC 1333 and HH 46/47. Spectroscopic follow-up by teams from the Leiden Observatory and the University of Colorado Boulder measured excitation conditions and chemical enrichment in the shocks.

Surveys combining data from the Chandra X-ray Observatory, the XMM-Newton, and infrared missions such as Spitzer and WISE cataloged young stellar objects in L1551, including classical and weak-line T Tauri stars first characterized in studies by the University of Hawaii and the University of California, Berkeley. Membership analyses employed proper motions from the Gaia mission alongside radial velocity studies from instruments at the Keck Observatory and the European Southern Observatory. Comparative assessments placed L1551’s initial mass function and multiplicity statistics in context with clusters like IC 348 and Chamaeleon I in papers appearing in the Astronomy & Astrophysics journal and the Publications of the Astronomical Society of the Pacific.

L1551 has been a target across the electromagnetic spectrum: radio campaigns by the National Radio Astronomy Observatory and the Very Large Array; millimeter and submillimeter mapping by the Atacama Pathfinder Experiment and the James Clerk Maxwell Telescope; infrared imaging by Spitzer, WISE, and the Herschel Space Observatory; optical imaging and spectroscopy with the Hubble Space Telescope, the Subaru Telescope, and the Keck Observatory; and X-ray studies with Chandra and XMM-Newton. Large collaborations from institutions such as the Max Planck Society, the Smithsonian Institution, and the Tokyo Astronomical Observatory contributed to multiwavelength catalogs archived in services like VizieR and analyzed in symposia hosted by the International Astronomical Union and meetings of the American Astronomical Society.

Category:Dark nebulae Category:Star-forming regions Category:Taurus (constellation)