
| Proposal ID | 030407 |
| Title | X-ray characterization of the FIRST Flat Spectrum Sample |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0304070101 |
| DOI | https://doi.org/10.5270/esa-l9xfg9c |
| Principal Investigator, PI | Dr Giovanni Fossati |
| Abstract | The FIRST Flat Spectrum Sample (FFSS) is a deep radio-selected sample, unbiasedwith respect to x-ray emission. It is designed to enable us to determine thetrue census of the different types of blazars, resolving a long-standinguncertainty, and the first step towards understanding how Nature makes jets.This proposal aims to determine the type of FIRST blazars, which is easilydetermined from radio-optical-X color and basic information about X-ray spectrum(hardness ratios). We propose to complete the x-ray characterization of a firstFFSS subsample by observing the remaining 13 sources for which no X-rayinformation currently exists. With this information we will be able to answerthe key question: What kind of jets does Nature make? |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2005-04-04T03:59:55Z/2006-08-19T07:38:39Z |
| Version | 21.51_20241115_1113 |
| Mission Description | The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2007-09-12T00:00:00Z |
| Last Update | 2026-06-19 |
| Keywords | "ffss subsample", "standing uncertainty", "radio optix color", "xray characterization", "xray emission", "deep radio", "makes jets", "x ray characterization", "xray information", "step towards", "flat spectrum sample", "basic information" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Giovanni Fossati, 2007, 'X-ray characterization of the FIRST Flat Spectrum Sample', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-l9xfg9c |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |