1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES
Sagittarius A*, the ~4 × 10[superscript 6] M ☉ black hole candidate at the Galactic center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength very long baseline interferometry (VLBI). We report on 1.3 mm wavelength observations of Sgr A* using a VLBI array consisting of t...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Institute of Physics/American Astronomical Society
2015
|
| Online Access: | http://hdl.handle.net/1721.1/95995 |
| _version_ | 1811068339733135360 |
|---|---|
| author | Fish, Vincent L. Doeleman, Sheperd Samuel Beaudoin, Christopher J. Blundell, Ray Bolin, David E. Bower, Geoffrey C. Chamberlin, Richard Freund, Robert Friberg, Per Gurwell, Mark A. Honma, Mareki Inoue, Makoto Krichbaum, Thomas P. Lamb, James Marrone, Daniel P. Moran, James M. Oyama, Tomoaki Plambeck, Richard Primiani, Rurik Rogers, Alan E. E. Smythe, Daniel L. SooHoo, Jason G. Strittmatter, Peter Tilanus, Remo P. J. Titus, Michael A. Weintroub, Jonathan Wright, Melvyn Woody, David Young, Ken H. Ziurys, Lucy M. |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Fish, Vincent L. Doeleman, Sheperd Samuel Beaudoin, Christopher J. Blundell, Ray Bolin, David E. Bower, Geoffrey C. Chamberlin, Richard Freund, Robert Friberg, Per Gurwell, Mark A. Honma, Mareki Inoue, Makoto Krichbaum, Thomas P. Lamb, James Marrone, Daniel P. Moran, James M. Oyama, Tomoaki Plambeck, Richard Primiani, Rurik Rogers, Alan E. E. Smythe, Daniel L. SooHoo, Jason G. Strittmatter, Peter Tilanus, Remo P. J. Titus, Michael A. Weintroub, Jonathan Wright, Melvyn Woody, David Young, Ken H. Ziurys, Lucy M. |
| author_sort | Fish, Vincent L. |
| collection | MIT |
| description | Sagittarius A*, the ~4 × 10[superscript 6] M ☉ black hole candidate at the Galactic center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength very long baseline interferometry (VLBI). We report on 1.3 mm wavelength observations of Sgr A* using a VLBI array consisting of the JCMT on Mauna Kea, the Arizona Radio Observatory's Submillimeter Telescope on Mt. Graham in Arizona, and two telescopes of the CARMA array at Cedar Flat in California. Both Sgr A* and the quasar calibrator 1924–292 were observed over three consecutive nights, and both sources were clearly detected on all baselines. For the first time, we are able to extract 1.3 mm VLBI interferometer phase information on Sgr A* through measurement of closure phase on the triangle of baselines. On the third night of observing, the correlated flux density of Sgr A* on all VLBI baselines increased relative to the first two nights, providing strong evidence for time-variable change on scales of a few Schwarzschild radii. These results suggest that future VLBI observations with greater sensitivity and additional baselines will play a valuable role in determining the structure of emission near the event horizon of Sgr A*. |
| first_indexed | 2024-09-23T07:54:33Z |
| format | Article |
| id | mit-1721.1/95995 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T07:54:33Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/959952022-09-30T00:54:44Z 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES Fish, Vincent L. Doeleman, Sheperd Samuel Beaudoin, Christopher J. Blundell, Ray Bolin, David E. Bower, Geoffrey C. Chamberlin, Richard Freund, Robert Friberg, Per Gurwell, Mark A. Honma, Mareki Inoue, Makoto Krichbaum, Thomas P. Lamb, James Marrone, Daniel P. Moran, James M. Oyama, Tomoaki Plambeck, Richard Primiani, Rurik Rogers, Alan E. E. Smythe, Daniel L. SooHoo, Jason G. Strittmatter, Peter Tilanus, Remo P. J. Titus, Michael A. Weintroub, Jonathan Wright, Melvyn Woody, David Young, Ken H. Ziurys, Lucy M. Haystack Observatory Fish, Vincent L. Doeleman, Sheperd Samuel Beaudoin, Christopher J. Bolin, David E. Smythe, Daniel L. SooHoo, Jason G. Titus, Michael A. Sagittarius A*, the ~4 × 10[superscript 6] M ☉ black hole candidate at the Galactic center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength very long baseline interferometry (VLBI). We report on 1.3 mm wavelength observations of Sgr A* using a VLBI array consisting of the JCMT on Mauna Kea, the Arizona Radio Observatory's Submillimeter Telescope on Mt. Graham in Arizona, and two telescopes of the CARMA array at Cedar Flat in California. Both Sgr A* and the quasar calibrator 1924–292 were observed over three consecutive nights, and both sources were clearly detected on all baselines. For the first time, we are able to extract 1.3 mm VLBI interferometer phase information on Sgr A* through measurement of closure phase on the triangle of baselines. On the third night of observing, the correlated flux density of Sgr A* on all VLBI baselines increased relative to the first two nights, providing strong evidence for time-variable change on scales of a few Schwarzschild radii. These results suggest that future VLBI observations with greater sensitivity and additional baselines will play a valuable role in determining the structure of emission near the event horizon of Sgr A*. National Science Foundation (U.S.) (NSF Research Experiences for Undergraduates program) Academia Sinica (Beijing, China) Smithsonian Institution 2015-03-12T19:08:28Z 2015-03-12T19:08:28Z 2011-02 2010-11 Article http://purl.org/eprint/type/JournalArticle 2041-8205 2041-8213 http://hdl.handle.net/1721.1/95995 Fish, Vincent L., Sheperd S. Doeleman, Christopher Beaudoin, Ray Blundell, David E. Bolin, Geoffrey C. Bower, Richard Chamberlin, et al. “1.3 Mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES.” The Astrophysical Journal 727, no. 2 (January 10, 2011): L36. © 2011 American Astronomical Society. en_US http://dx.doi.org/10.1088/2041-8205/727/2/l36 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Fish, Vincent L. Doeleman, Sheperd Samuel Beaudoin, Christopher J. Blundell, Ray Bolin, David E. Bower, Geoffrey C. Chamberlin, Richard Freund, Robert Friberg, Per Gurwell, Mark A. Honma, Mareki Inoue, Makoto Krichbaum, Thomas P. Lamb, James Marrone, Daniel P. Moran, James M. Oyama, Tomoaki Plambeck, Richard Primiani, Rurik Rogers, Alan E. E. Smythe, Daniel L. SooHoo, Jason G. Strittmatter, Peter Tilanus, Remo P. J. Titus, Michael A. Weintroub, Jonathan Wright, Melvyn Woody, David Young, Ken H. Ziurys, Lucy M. 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES |
| title | 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES |
| title_full | 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES |
| title_fullStr | 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES |
| title_full_unstemmed | 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES |
| title_short | 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES |
| title_sort | 1 3 mm wavelength vlbi of sagittarius a detection of time variable emission on event horizon scales |
| url | http://hdl.handle.net/1721.1/95995 |
| work_keys_str_mv | AT fishvincentl 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT doelemansheperdsamuel 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT beaudoinchristopherj 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT blundellray 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT bolindavide 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT bowergeoffreyc 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT chamberlinrichard 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT freundrobert 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT fribergper 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT gurwellmarka 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT honmamareki 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT inouemakoto 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT krichbaumthomasp 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT lambjames 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT marronedanielp 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT moranjamesm 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT oyamatomoaki 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT plambeckrichard 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT primianirurik 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT rogersalanee 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT smythedaniell 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT soohoojasong 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT strittmatterpeter 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT tilanusremopj 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT titusmichaela 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT weintroubjonathan 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT wrightmelvyn 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT woodydavid 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT youngkenh 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales AT ziuryslucym 13mmwavelengthvlbiofsagittariusadetectionoftimevariableemissiononeventhorizonscales |