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ALMA High-frequency Long Baseline Campaign in 2021 : Highest Angular Resolution Submillimeter Wave Images for the Carbon-rich Star R Lep

Asaki, Yoshiharu (författare)
Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile.;Natl Astron Observ Japan, Abedules 3085 Oficina 701, Santiago 7630414, Chile.;SOKENDAI, Grad Univ Adv Studies, Sch Phys Sci, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Maud, Luke T. (författare)
ESO Headquarters, Karl Schwarzchild Str 2, D-85748 Garching, Germany.;Leiden Univ, Allegro, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands.
Francke, Harold (författare)
Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile.
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Nagai, Hiroshi (författare)
Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Petry, Dirk (författare)
ESO Headquarters, Karl Schwarzchild Str 2, D-85748 Garching, Germany.
Fomalont, Edward B. (författare)
Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA.
Humphreys, Elizabeth (författare)
Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile.;ESO Vitacura, Alonso Cordova 3107, Santiago, Chile.
Richards, Anita M. S. (författare)
Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Manchester M13 9PL, England.
Wong, K. T. (författare)
Uppsala universitet,Institutionen för fysik och astronomi,Inst Radioastron Millimetr, IRAM ARC Node, 300 Rue Piscine, F-38406 Saint-martin, France.
Dent, William (författare)
Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile.
Hirota, Akihiko (författare)
Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile.;Natl Astron Observ Japan, Abedules 3085 Oficina 701, Santiago 7630414, Chile.
Fernandez, Jose Miguel (författare)
Lowell Observ, 1400 Mars Hill Rd, Flagstaff, AZ 86001 USA.
Takahashi, Satoko (författare)
Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Hales, Antonio S. (författare)
Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile.;Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA.
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Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Vitacura, Chile;Natl Astron Observ Japan, Abedules 3085 Oficina 701, Santiago 7630414, Chile.;SOKENDAI, Grad Univ Adv Studies, Sch Phys Sci, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan. ESO Headquarters, Karl Schwarzchild Str 2, D-85748 Garching, Germany.;Leiden Univ, Allegro, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands. (creator_code:org_t)
Institute of Physics (IOP), 2023
2023
Engelska.
Ingår i: Astrophysical Journal. - : Institute of Physics (IOP). - 0004-637X .- 1538-4357. ; 958:1
Relaterad länk:
https://doi.org/10.3...
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https://uu.diva-port... (primary) (Raw object)
https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • The Atacama Large Millimeter/submillimeter Array (ALMA) was used in 2021 to image the carbon-rich evolved star R Lep in Bands 8-10 (397-908 GHz) with baselines up to 16 km. The goal was to validate the calibration, using band-to-band (B2B) phase referencing with a close phase calibrator J0504-1512, 1.degrees 2 from R Lep in this case, and the imaging procedures required to obtain the maximum angular resolution achievable with ALMA. Images of the continuum emission and the hydrogen cyanide (HCN) maser line at 890.8 GHz, from the J = 10-9 transition between the (1110) and (0400) vibrationally excited states, achieved angular resolutions of 13, 6, and 5 mas in Bands 8-10, respectively. Self-calibration (self-cal) was used to produce ideal images to compare with the B2B phase referencing technique. The continuum emission was resolved in Bands 9 and 10, leaving too little flux for the self-cal of the longest baselines, so these comparisons are made at coarser resolution. Comparisons showed that B2B phase referencing provided phase corrections sufficient to recover 92%, 83%, and 77% of the ideal image continuum flux densities. The HCN maser was sufficiently compact to obtain self-cal solutions in Band 10 for all baselines (up to 16 km). In Band 10, B2B phase referencing as compared to the ideal images recovered 61% and 70% of the flux density for the HCN maser and continuum, respectively.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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