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Title: THE INTERMEDIATE-MASS BLACK HOLE CANDIDATE IN THE CENTER OF NGC 404: NEW EVIDENCE FROM RADIO CONTINUUM OBSERVATIONS

Abstract

We present the results of deep, high-resolution, 5 GHz Expanded Very Large Array (EVLA) observations of the nearby, dwarf lenticular galaxy and intermediate-mass black hole candidate (M{sub BH} {approx} 4.5 Multiplication-Sign 10{sup 5} M{sub Sun }), NGC 404. For the first time, radio emission at frequencies above 1.4 GHz has been detected in this galaxy. We found a modestly resolved source in the NGC 404 nucleus with a total radio luminosity of 7.6 {+-} 0.7 Multiplication-Sign 10{sup 17} W Hz{sup -1} at 5 GHz and a spectral index from 5 to 7.45 GHz of {alpha} = -0.88 {+-} 0.30. NGC 404 is only the third central intermediate-mass black hole candidate detected in the radio regime with subarcsecond resolution. The position of the radio source is consistent with the optical center of the galaxy and the location of a known, hard X-ray point source (L{sub X} {approx} 1.2 Multiplication-Sign 10{sup 37} erg s{sup -1}). The faint radio and X-ray emission could conceivably be produced by an X-ray binary, star formation, a supernova remnant, or a low-luminosity active galactic nucleus powered by an intermediate-mass black hole. In light of our new EVLA observations, we find that the most likely scenario is anmore » accreting intermediate-mass black hole, with other explanations being either incompatible with the observed X-ray and/or radio luminosities or statistically unlikely.« less

Authors:
; ;  [1];  [2]
  1. Department of Physics, New Mexico Tech., 801 Leroy Place, Socorro, NM 87801 (United States)
  2. National Radio Astronomy Observatory, Socorro, NM 87801 (United States)
Publication Date:
OSTI Identifier:
22039418
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 753; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BINARY STARS; BLACK HOLES; GALAXIES; GALAXY NUCLEI; GAMMA ASTRONOMY; GHZ RANGE; HARD X RADIATION; INDEXES; LUMINOSITY; MASS; PHOTON EMISSION; POINT SOURCES; RADIOASTRONOMY; RADIOWAVE RADIATION; RESOLUTION; STAR ACCRETION; SUPERNOVA REMNANTS; VISIBLE RADIATION

Citation Formats

Nyland, Kristina, Marvil, Josh, Young, Lisa M, Wrobel, J M, and Zauderer, B. Ashley, E-mail: knyland@nmt.edu. THE INTERMEDIATE-MASS BLACK HOLE CANDIDATE IN THE CENTER OF NGC 404: NEW EVIDENCE FROM RADIO CONTINUUM OBSERVATIONS. United States: N. p., 2012. Web. doi:10.1088/0004-637X/753/2/103.
Nyland, Kristina, Marvil, Josh, Young, Lisa M, Wrobel, J M, & Zauderer, B. Ashley, E-mail: knyland@nmt.edu. THE INTERMEDIATE-MASS BLACK HOLE CANDIDATE IN THE CENTER OF NGC 404: NEW EVIDENCE FROM RADIO CONTINUUM OBSERVATIONS. United States. doi:10.1088/0004-637X/753/2/103.
Nyland, Kristina, Marvil, Josh, Young, Lisa M, Wrobel, J M, and Zauderer, B. Ashley, E-mail: knyland@nmt.edu. Tue . "THE INTERMEDIATE-MASS BLACK HOLE CANDIDATE IN THE CENTER OF NGC 404: NEW EVIDENCE FROM RADIO CONTINUUM OBSERVATIONS". United States. doi:10.1088/0004-637X/753/2/103.
@article{osti_22039418,
title = {THE INTERMEDIATE-MASS BLACK HOLE CANDIDATE IN THE CENTER OF NGC 404: NEW EVIDENCE FROM RADIO CONTINUUM OBSERVATIONS},
author = {Nyland, Kristina and Marvil, Josh and Young, Lisa M and Wrobel, J M and Zauderer, B. Ashley, E-mail: knyland@nmt.edu},
abstractNote = {We present the results of deep, high-resolution, 5 GHz Expanded Very Large Array (EVLA) observations of the nearby, dwarf lenticular galaxy and intermediate-mass black hole candidate (M{sub BH} {approx} 4.5 Multiplication-Sign 10{sup 5} M{sub Sun }), NGC 404. For the first time, radio emission at frequencies above 1.4 GHz has been detected in this galaxy. We found a modestly resolved source in the NGC 404 nucleus with a total radio luminosity of 7.6 {+-} 0.7 Multiplication-Sign 10{sup 17} W Hz{sup -1} at 5 GHz and a spectral index from 5 to 7.45 GHz of {alpha} = -0.88 {+-} 0.30. NGC 404 is only the third central intermediate-mass black hole candidate detected in the radio regime with subarcsecond resolution. The position of the radio source is consistent with the optical center of the galaxy and the location of a known, hard X-ray point source (L{sub X} {approx} 1.2 Multiplication-Sign 10{sup 37} erg s{sup -1}). The faint radio and X-ray emission could conceivably be produced by an X-ray binary, star formation, a supernova remnant, or a low-luminosity active galactic nucleus powered by an intermediate-mass black hole. In light of our new EVLA observations, we find that the most likely scenario is an accreting intermediate-mass black hole, with other explanations being either incompatible with the observed X-ray and/or radio luminosities or statistically unlikely.},
doi = {10.1088/0004-637X/753/2/103},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 753,
place = {United States},
year = {2012},
month = {7}
}