* Astronomy

Title: HST observations of the quasar PKS 0637-752: equipartition electron-proton jet from the most complete spectral coverage to date Authors: Kushal T. Mehta, Markos Georganopoulos, Eric S. Perlman, Charles A. Padgett, George Chartas We present new NICMOS and ACS observations of the quasar...

A research group led by graduate student Violette Impellizzeri from the Max Planck Institute for Radio Astronomy has used the 100 m Effelsberg radio telescope to detect water at the greatest distance from Earth so far. The water vapour was discovered in the quasar MG J0414+0534 at redshift 2.64, wh...

Resuelven el misterio del brillo del cuásar gemelo Las variaciones en el brillo del cuásar Q0957+561, conocido como el "cuásar gemelo" debido a que su imagen llega duplicada a la Tierra, son intrínsecas al propio astro y no son causadas por efectos de la gravedad de posibles planetas o es...

An intense star-forming region that produces a combined mass of more than one thousand solar masses a year has been found 12.8 billion light-years from Earth. The so-called 'hyper-starburst' is part of a young, quasar-containing galaxy. Because it is so far away, we can only see how the galaxy appe...

New data from NASA's Chandra X-ray Observatory may provide clues to how quasars "turn on." Since the discovery of quasars over 40 years ago, astronomers have been trying to understand the conditions surrounding the birth of these immensely powerful objects. Hot, X-ray producing reg...

Quasar 3C249.1 The powerful and distant quasar 3C 249.1 has one of the largest extended emission-line regions (EELRs) known, extending out over tens of kiloparsecs of surrounding space. Astronomers Hai Fu and Alan Stockton of the Institute for Astronomy (University of Hawai'i) recently cons...

Title: The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission? Authors: M.C. Erlund, A.C. Fabian, Katherine M. Blundell, C. Moss, D.R. Ballantyne We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (w...

Title: The unusual UV continuum of quasar Ton 34 and the possibility of crystalline dust absorption Authors: Luc Binette, Yair Krongold Luminous quasars are known to display a sharp steepening of the continuum near 1100A. This spectral feature is not well fitted by current accretion disk models,...

XMM-Newton has been surprised by a rare type of galaxy, from which it has detected a higher number of X-rays than thought possible. The observation gives new insight into the powerful processes shaping galaxies during their formation and evolution. Scientists working with XMM-Newton were look...

Title: Chandra LETGS spectroscopy of the Quasar MR2251-178 and its warm absorber Authors: J.M. Ramírez (1), S. Komossa (1), V. Burwitz (1), S. Mathur (2) ((1) Max-Planck-Institut für extraterrestriche Physik, Garching, Germany, (2) Department of Astronomy, Ohio State University, Columbus)...

When a pair of researchers aimed the National Science Foundation's Very Long Baseline Array (VLBA) radio telescope toward a famous quasar, they sought evidence to support a popular theory for why the superfast jets of particles streaming from quasars are confined to narrow streams. Instead, the...

Title: The Mass of the Black Hole in the Quasar PG 2130+099 Authors: C. J. Grier, B. M. Peterson, M. C. Bentz, K. D. Denney, J. D. Eastman, M. Dietrich, R. W. Pogge, J. L. Prieto, D. L. DePoy, R. J. Assef, D. W. Atlee, J. Bird, M. E. Eyler, M. S. Peeples, R. Siverd, L. C. Watson, J. C. Yee We present the results o...

The most massive black hole in the universe has been measured at being 18 billion solar masses. The binary black hole at the centre of quasar OJ287, which is located 3.5 billion light-years away in the constellation Cancer, has a regular pulsing light signal with two major pulses every 12 years. The l...

Title: A Deep XMM-Newton Observation of the Quasar 3C 287 Authors: G. Salvesen (1), J. M. Miller (1), E. Cackett (1), A. Siemiginowska (2) ((1) University of Michigan, (2) Harvard-Smithsonian CfA) We report on an XMM-Newton observation of the z=1.055 quasar and Giga-hertz Peaked Spectrum (GPS) s...

Microlensing variability in the gravitationally lensed quasar QSO 2237+0305 = the Einstein Cross. Astronomers Dissect a Supermassive Black Hole with Natural Magnifying Glasses Combining a double natural "magnifying glass" with the power of ESO's Very Large Telescope, astronome...

Calar Alto participates in a multi-observatory effort to study the most luminous quasar ever observed. The object, radio quasar 3C 454.3 in the constellation Pegasus, experienced during 2005 a strong optical outburst that made it observable even with amateur instrumentation (reaching R = 12 ma...

Title: A Compton-thick Wind in the High Luminosity Quasar, PDS 456 Authors: J.N. Reeves, P.T. O'Brien, V. Braito, E. Behar, L. Miller, T.J. Turner, A.C. Fabian, S. Kaspi, R. Mushotzky, M. Ward PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observatio...

Title: SDSS J1254+0846: A Binary Quasar Caught in the Act of Merging Authors: Paul J. Green (1), Adam D. Myers (2), Wayne A. Barkhouse (3), John S. Mulchaey (4), Vardha N. Bennert (5), Thomas J. Cox (1,3), Thomas L. Aldcroft (1) ((1) Harvard-Smithsonian Centre for Astrophysics, (2) University of Il...

First high-resolution image from the LOFAR radio telescope array Both, the Max-Planck-Institut für Radioastronomie (Bonn) and the Max-Planck-Institut für Astrophysik (Garching), run stations of the International LOFAR telescope (ILT), coordinated by ASTRON, the Netherlands Institute f...

NASA's Chandra X-ray Observatory has observed an unusual galaxy cluster that contains a bright core of relatively cool gas surrounding a quasar called 3C 186. This is the most distant such object yet observed, and could provide insight into the triggering of quasars and the growth of galaxy cluste...

Title: 4C 02.27: what is inside a double-double radio quasar? Authors: S. Frey (FOMI SGO), Z. Paragi (JIVE) Recently Jamrozy et al. (2009) identified 4C 02.27 (J0935+0204) as the first possible example of a double-double radio source which is optically identified with a quasar (i.e. not a galaxy)...

Title: X-ray microlensing in the quadruply lensed quasar Q2237+0305 Authors: F. Zimmer (1), R. W. Schmidt (1), J. Wambsganss (1), ((1) ARI/Zentrum f. Astronomie, University of Heidelberg) We use archival data of NASA's Chandra X-ray telescope to compile an X-ray light curve of all four images of...

Title: I. Flux and colour variations of the quadruply imaged quasar HE 0435--1223 Authors: D. Ricci, J. Poels, A. Elyiv, F. Finet, P. G. Sprimont, T. Anguita, V. Bozza, P. Browne, M. Burgdorf, S. Calchi Novati, M. Dominik, S. Dreizler, M. Glitrup, F. Grundahl, K. Harpsøe, F. Hessman, T. C. Hinse, A. H...

Title: LBQS 0103-2753: A Binary Quasar in a Major Merger Authors: G. A. Shields, D. J. Rosario, V. Junkkarinen, S. C. Chapman, E. W. Bonning, T. Chiba We present HST and UKIRT spectra and images of the 2 kpc binary quasar LBQS 0103-2753 (z=0.858). The HST images (V- and I-band) show tidal features demo...

Title: OJ 287 binary black hole system Authors: Mauri Valtonen, Stefano Ciprini The light curve of the quasar OJ 287 extends from 1891 up today without major gaps. Here we summarise the results of the 2005 - 2010 observing campaign. The main results are the following: (1) The 2005 October optical out...

Title: Caught in the Act: Discovery of a Physical Quasar Triplet Authors: E. P. Farina, C. Montuori, R. Decarli, M. Fumagalli We present the discovery of a triplet of quasars at z~1.51. The whole system is well accommodated within 25 arcsec (i.e., 200 kpc in projected distance). The velocity differ...

ULAS J1342+0928 is the most distant known quasar detected and contains the most distant supermassive black hole, at a reported redshift of z = 7.54, surpassing the redshift of 7 for the previously known most distant quasar ULAS J1120+0641. The ULAS J1342+0928 quasar is 13.1 billion light-years aw...

	Forum	Replies	Views	Last Post
Quasar PKS 0637-752 (Preview)	Cosmology News	1	4899	Oct 22 17:09 2012 by Blobrana
Title: HST observations of the quasar PKS 0637-752: equipartition electron-proton jet from the most complete spectral coverage to date Authors: Kushal T. Mehta, Markos Georganopoulos, Eric S. Perlman, Charles A. Padgett, George Chartas We present new NICMOS and ACS observations of the quasar...
Quasar MG J0414+0534 (Preview)	Cosmology News	8	4418	Dec 12 00:45 2012 by Blobrana
A research group led by graduate student Violette Impellizzeri from the Max Planck Institute for Radio Astronomy has used the 100 m Effelsberg radio telescope to detect water at the greatest distance from Earth so far. The water vapour was discovered in the quasar MG J0414+0534 at redshift 2.64, wh...
Quasar Quasar Q0957+561 (Preview)	Cosmology News	6	5769	Jan 24 23:25 2014 by Blobrana
Resuelven el misterio del brillo del cuásar gemelo Las variaciones en el brillo del cuásar Q0957+561, conocido como el "cuásar gemelo" debido a que su imagen llega duplicada a la Tierra, son intrínsecas al propio astro y no son causadas por efectos de la gravedad de posibles planetas o es...
Quasar QSO J1148+5251 (Preview)	Cosmology News	6	7024	Oct 24 03:26 2012 by Blobrana
An intense star-forming region that produces a combined mass of more than one thousand solar masses a year has been found 12.8 billion light-years from Earth. The so-called 'hyper-starburst' is part of a young, quasar-containing galaxy. Because it is so far away, we can only see how the galaxy appe...
Quasar Quasar 4C37.43 (Preview)	Cosmology News	0	2103	Mar 27 12:35 2006 by Blobrana
New data from NASA's Chandra X-ray Observatory may provide clues to how quasars "turn on." Since the discovery of quasars over 40 years ago, astronomers have been trying to understand the conditions surrounding the birth of these immensely powerful objects. Hot, X-ray producing reg...
Quasar Quasar 3C249.1 (Preview)	Cosmology News	0	2264	Sep 5 18:49 2006 by Blobrana
Quasar 3C249.1 The powerful and distant quasar 3C 249.1 has one of the largest extended emission-line regions (EELRs) known, extending out over tens of kiloparsecs of surrounding space. Astronomers Hai Fu and Alan Stockton of the Institute for Astronomy (University of Hawai'i) recently cons...
Quasar Quasar 4C74.26 (Preview)	Cosmology News	0	2140	May 10 08:11 2007 by Blobrana
Title: The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission? Authors: M.C. Erlund, A.C. Fabian, Katherine M. Blundell, C. Moss, D.R. Ballantyne We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (w...
Quasar Quasar Ton 34 (Preview)	Cosmology News	1	3637	Mar 16 11:23 2017 by Blobrana
Title: The unusual UV continuum of quasar Ton 34 and the possibility of crystalline dust absorption Authors: Luc Binette, Yair Krongold Luminous quasars are known to display a sharp steepening of the continuum near 1100A. This spectral feature is not well fitted by current accretion disk models,...
Quasar BAL quasars (Preview)	Cosmology News	2	4945	Oct 2 21:04 2012 by Blobrana
XMM-Newton has been surprised by a rare type of galaxy, from which it has detected a higher number of X-rays than thought possible. The observation gives new insight into the powerful processes shaping galaxies during their formation and evolution. Scientists working with XMM-Newton were look...
Quasar Quasar MR2251-178 (Preview)	Cosmology News	1	3246	Feb 20 16:33 2014 by Blobrana
Title: Chandra LETGS spectroscopy of the Quasar MR2251-178 and its warm absorber Authors: J.M. Ramírez (1), S. Komossa (1), V. Burwitz (1), S. Mathur (2) ((1) Max-Planck-Institut für extraterrestriche Physik, Garching, Germany, (2) Department of Astronomy, Ohio State University, Columbus)...
Quasar Quasar 3C273 ( 1 2 ) (Preview)	Cosmology News	11	13338	May 3 03:52 2013 by Blobrana
When a pair of researchers aimed the National Science Foundation's Very Long Baseline Array (VLBA) radio telescope toward a famous quasar, they sought evidence to support a popular theory for why the superfast jets of particles streaming from quasars are confined to narrow streams. Instead, the...
Quasar Quasar PG 2130+099 (Preview)	Cosmology News	0	2105	Aug 6 09:56 2008 by Blobrana
Title: The Mass of the Black Hole in the Quasar PG 2130+099 Authors: C. J. Grier, B. M. Peterson, M. C. Bentz, K. D. Denney, J. D. Eastman, M. Dietrich, R. W. Pogge, J. L. Prieto, D. L. DePoy, R. J. Assef, D. W. Atlee, J. Bird, M. E. Eyler, M. S. Peeples, R. Siverd, L. C. Watson, J. C. Yee We present the results o...
Quasar Quasar OJ287 (Preview)	Cosmology News	9	10279	Sep 13 08:41 2016 by Blobrana
The most massive black hole in the universe has been measured at being 18 billion solar masses. The binary black hole at the centre of quasar OJ287, which is located 3.5 billion light-years away in the constellation Cancer, has a regular pulsing light signal with two major pulses every 12 years. The l...
Quasar Quasar 3C 287 (Preview)	Cosmology News	0	1950	Sep 29 15:43 2008 by Blobrana
Title: A Deep XMM-Newton Observation of the Quasar 3C 287 Authors: G. Salvesen (1), J. M. Miller (1), E. Cackett (1), A. Siemiginowska (2) ((1) University of Michigan, (2) Harvard-Smithsonian CfA) We report on an XMM-Newton observation of the z=1.055 quasar and Giga-hertz Peaked Spectrum (GPS) s...
Quasar QSO 2237+0305 (Preview)	Cosmology News	4	6251	Dec 27 10:07 2010 by Blobrana
Microlensing variability in the gravitationally lensed quasar QSO 2237+0305 = the Einstein Cross. Astronomers Dissect a Supermassive Black Hole with Natural Magnifying Glasses Combining a double natural "magnifying glass" with the power of ESO's Very Large Telescope, astronome...
Quasar Quasar 3C454.3 (Preview)	Cosmology News	7	6216	Nov 7 18:18 2016 by Blobrana
Calar Alto participates in a multi-observatory effort to study the most luminous quasar ever observed. The object, radio quasar 3C 454.3 in the constellation Pegasus, experienced during 2005 a strong optical outburst that made it observable even with amateur instrumentation (reaching R = 12 ma...
Quasar High Luminosity Quasar PDS 456 (Preview)	Cosmology News	3	5018	Feb 25 10:16 2015 by Blobrana
Title: A Compton-thick Wind in the High Luminosity Quasar, PDS 456 Authors: J.N. Reeves, P.T. O'Brien, V. Braito, E. Behar, L. Miller, T.J. Turner, A.C. Fabian, S. Kaspi, R. Mushotzky, M. Ward PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observatio...
Quasar SDSS J125454.87+084652.1 (Preview)	Cosmology News	4	2467	Feb 11 16:07 2010 by Blobrana
Title: SDSS J1254+0846: A Binary Quasar Caught in the Act of Merging Authors: Paul J. Green (1), Adam D. Myers (2), Wayne A. Barkhouse (3), John S. Mulchaey (4), Vardha N. Bennert (5), Thomas J. Cox (1,3), Thomas L. Aldcroft (1) ((1) Harvard-Smithsonian Centre for Astrophysics, (2) University of Il...
Quasar Quasar 3C 196 (Preview)	Cosmology News	0	2774	Jun 2 13:04 2010 by Blobrana
First high-resolution image from the LOFAR radio telescope array Both, the Max-Planck-Institut für Radioastronomie (Bonn) and the Max-Planck-Institut für Astrophysik (Garching), run stations of the International LOFAR telescope (ILT), coordinated by ASTRON, the Netherlands Institute f...
Quasar Quasar 3C 186 (Preview)	Galaxies	2	2828	Mar 24 10:41 2017 by Blobrana
NASA's Chandra X-ray Observatory has observed an unusual galaxy cluster that contains a bright core of relatively cool gas surrounding a quasar called 3C 186. This is the most distant such object yet observed, and could provide insight into the triggering of quasars and the growth of galaxy cluste...
Quasar 4C 02.27 (Preview)	Galaxies	0	2128	Dec 15 10:03 2010 by Blobrana
Title: 4C 02.27: what is inside a double-double radio quasar? Authors: S. Frey (FOMI SGO), Z. Paragi (JIVE) Recently Jamrozy et al. (2009) identified 4C 02.27 (J0935+0204) as the first possible example of a double-double radio source which is optically identified with a quasar (i.e. not a galaxy)...
Quasar Q2237+0305 (Preview)	Galaxies	0	2132	Dec 23 08:24 2010 by Blobrana
Title: X-ray microlensing in the quadruply lensed quasar Q2237+0305 Authors: F. Zimmer (1), R. W. Schmidt (1), J. Wambsganss (1), ((1) ARI/Zentrum f. Astronomie, University of Heidelberg) We use archival data of NASA's Chandra X-ray telescope to compile an X-ray light curve of all four images of...
Quasar HE 0435-1223 (Preview)	Galaxies	0	2144	Jan 20 21:54 2011 by Blobrana
Title: I. Flux and colour variations of the quadruply imaged quasar HE 0435--1223 Authors: D. Ricci, J. Poels, A. Elyiv, F. Finet, P. G. Sprimont, T. Anguita, V. Bozza, P. Browne, M. Burgdorf, S. Calchi Novati, M. Dominik, S. Dreizler, M. Glitrup, F. Grundahl, K. Harpsøe, F. Hessman, T. C. Hinse, A. H...
Quasar LBQS 0103-2753 (Preview)	Galaxies	0	1779	Sep 8 03:16 2011 by Blobrana
Title: LBQS 0103-2753: A Binary Quasar in a Major Merger Authors: G. A. Shields, D. J. Rosario, V. Junkkarinen, S. C. Chapman, E. W. Bonning, T. Chiba We present HST and UKIRT spectra and images of the 2 kpc binary quasar LBQS 0103-2753 (z=0.858). The HST images (V- and I-band) show tidal features demo...
Quasar OJ 287 (Preview)	Cosmology News	6	4877	Dec 5 15:25 2016 by Blobrana
Title: OJ 287 binary black hole system Authors: Mauri Valtonen, Stefano Ciprini The light curve of the quasar OJ 287 extends from 1891 up today without major gaps. Here we summarise the results of the 2005 - 2010 observing campaign. The main results are the following: (1) The 2005 October optical out...
Quasar QQQ J1519+0627 (Preview)	Cosmology News	1	2423	Mar 18 21:58 2013 by Blobrana
Title: Caught in the Act: Discovery of a Physical Quasar Triplet Authors: E. P. Farina, C. Montuori, R. Decarli, M. Fumagalli We present the discovery of a triplet of quasars at z~1.51. The whole system is well accommodated within 25 arcsec (i.e., 200 kpc in projected distance). The velocity differ...
Quasar ULAS J1342+0928 (Preview)	Galaxies	0	2578	Dec 20 18:05 2017 by Blobrana
ULAS J1342+0928 is the most distant known quasar detected and contains the most distant supermassive black hole, at a reported redshift of z = 7.54, surpassing the redshift of 7 for the previously known most distant quasar ULAS J1120+0641. The ULAS J1342+0928 quasar is 13.1 billion light-years aw...