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X Demographics
Mendeley readers
Attention Score in Context
| Title |
The diversity of quasars unified by accretion and orientation
|
|---|---|
| Published in |
Nature, September 2014
|
| DOI | 10.1038/nature13712 |
| Pubmed ID | |
| Authors |
Yue Shen, Luis C. Ho |
| Abstract |
Quasars are rapidly accreting supermassive black holes at the centres of massive galaxies. They display a broad range of properties across all wavelengths, reflecting the diversity in the physical conditions of the regions close to the central engine. These properties, however, are not random, but form well-defined trends. The dominant trend is known as 'Eigenvector 1', in which many properties correlate with the strength of optical iron and [O III] emission. The main physical driver of Eigenvector 1 has long been suspected to be the quasar luminosity normalized by the mass of the hole (the 'Eddington ratio'), which is an important parameter of the black hole accretion process. But a definitive proof has been missing. Here we report an analysis of archival data that reveals that the Eddington ratio indeed drives Eigenvector 1. We also find that orientation plays a significant role in determining the observed kinematics of the gas in the broad-line region, implying a flattened, disk-like geometry for the fast-moving clouds close to the black hole. Our results show that most of the diversity of quasar phenomenology can be unified using two simple quantities: Eddington ratio and orientation. |
X Demographics
The data shown below were collected from the profiles of 24 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Australia | 3 | 13% |
| Japan | 2 | 8% |
| Mexico | 2 | 8% |
| United States | 2 | 8% |
| India | 1 | 4% |
| Belgium | 1 | 4% |
| Spain | 1 | 4% |
| Puerto Rico | 1 | 4% |
| United Kingdom | 1 | 4% |
| Other | 1 | 4% |
| Unknown | 9 | 38% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 17 | 71% |
| Scientists | 5 | 21% |
| Practitioners (doctors, other healthcare professionals) | 1 | 4% |
| Unknown | 1 | 4% |
Mendeley readers
The data shown below were compiled from readership statistics for 116 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 3 | 3% |
| China | 2 | 2% |
| Italy | 1 | <1% |
| Germany | 1 | <1% |
| United Kingdom | 1 | <1% |
| Unknown | 108 | 93% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 44 | 38% |
| Researcher | 23 | 20% |
| Student > Bachelor | 8 | 7% |
| Student > Doctoral Student | 7 | 6% |
| Student > Master | 6 | 5% |
| Other | 13 | 11% |
| Unknown | 15 | 13% |
| Readers by discipline | Count | As % |
|---|---|---|
| Physics and Astronomy | 95 | 82% |
| Environmental Science | 1 | <1% |
| Psychology | 1 | <1% |
| Agricultural and Biological Sciences | 1 | <1% |
| Earth and Planetary Sciences | 1 | <1% |
| Other | 1 | <1% |
| Unknown | 16 | 14% |
Attention Score in Context
This research output has an Altmetric Attention Score of 144. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 18 July 2017.
All research outputs
#274,232
of 24,652,007 outputs
Outputs from Nature
#15,324
of 95,564 outputs
Outputs of similar age
#2,441
of 244,020 outputs
Outputs of similar age from Nature
#232
of 979 outputs
Altmetric has tracked 24,652,007 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 98th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 95,564 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 101.8. This one has done well, scoring higher than 83% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 244,020 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 979 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 76% of its contemporaries.